12V DC Transformers | McMaster-Carr

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44 Products

AC to DC Adapter Cords

Negative

NEMA 1-15 Plug

Positive

Plug these adapter cords into a standard outlet and they change AC voltage to DC voltage. These cords use switching regulation, so they produce the stated voltage even when your outlet’s power or the power drawn by your device fluctuates. It also means they won’t get too hot. They have an LPS low-voltage output and Class II shock protection, so if something fails inside these cords, they’ll limit the risk of electrical shocks. These cords meet U.S. and Canadian safety standards as well as U.S. DOE (Department of Energy) Level VI standards for energy efficiency.

When choosing an adapter, match the output voltage and polarity of your device. Look for the polarity illustration on your device or the adapter you're replacing. The current you choose should, at a minimum, match your device. You can choose a higher current, but it will not improve performance.

Barrel Output Connection					Straight-Blade Input Connection
Voltage	Current, A	End ID, mm	End OD, mm	End Shape	Voltage	Current, A	NEMA Style	End Shape	Lg., ft.	Protections Provided	Specifications Met		Each
Negative Polarity
12V DC	0.7	2.1	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	00000000	00000
12V DC	0.7	2.5	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	0000
12V DC	1	2.1	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	00000000	00000
12V DC	1	2.5	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	1.5	2.1	5.5	Straight	120V AC 240V AC	0.5	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	1.5	2.5	5.5	Straight	120V AC 240V AC	0.5	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	2	2.1	5.5	Straight	120V AC 240V AC	0.8	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	00000000	00000
12V DC	2	2.5	5.5	Straight	120V AC 240V AC	0.8	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	3	2.1	5.5	Straight	120V AC 240V AC	1.3	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	3	2.5	5.5	Straight	120V AC 240V AC	1.3	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
Positive Polarity
12V DC	0.7	2.1	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	00000000	0000
12V DC	0.7	2.5	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	0000
12V DC	1	2.1	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	00000000	00000
12V DC	1	2.5	5.5	Straight	120V AC 240V AC	0.4	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	1.5	2.1	5.5	Straight	120V AC 240V AC	0.5	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	1.5	2.5	5.5	Straight	120V AC 240V AC	0.5	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	2	2.1	5.5	Straight	120V AC 240V AC	0.8	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	00000000	00000
12V DC	2	2.5	5.5	Straight	120V AC 240V AC	0.8	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	3	2.1	5.5	Straight	120V AC 240V AC	1.3	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000
12V DC	3	2.5	5.5	Straight	120V AC 240V AC	1.3	1-15	90° Elbow	6	Overvoltage, Short Circuit	UL Listed, C-UL Listed, DOE Level VI Efficiency	000000000	00000

Detachable-Cord AC to DC Adapters

IEC C8 Input and Barrel Output

IEC C14 Input and Barrel Output

IEC C14 Input and 4-Pin Output

IEC C14 Input with 6-Pin Output

Barrel Output

IEC C8 Input

Positive

IEC C14 Input

4-Pole 4-Pin Circular DIN Output

6-Pole Molex Mini-Fit Output

Couple these adapters with a cord that matches your outlet and length requirements to run DC-powered electronics. Instead of plugging directly into an outlet, the body of these adapters sits on the floor or other surface, so it remains out of the way and won’t block multiple outlets. These adapters use switching regulation—they produce the stated voltage even when your outlet’s power or the power drawn by your device fluctuates. Most have an LPS low-voltage output, so if something fails inside these adapters, they’ll limit the risk of electrical shocks. They meet U.S., Canadian, and European safety standards. Many also meet U.S. and European standards for energy efficiency.

Adapters with an IEC C8 input require power cords with a C7 socket. With Class II shock protection, they have two levels of insulation that prevent electrical shocks.

Adapters with an IEC C14 input require power cords with a C13 socket. They have Class I shock protection and prevent electrical shocks with a combination of insulation and a protective ground.

Barrel/Pin Output Connection						Straight-Blade Input Connection
Voltage	Current, A	Polarity	End ID, mm	End OD, mm	End Shape	Voltage	Current, A	End Shape	Lg., ft.	Shock Protection Class	Protections Provided	Color		Each
IEC C8 Input × Barrel Output
12V DC	1.6	Positive	2.1	5.5	Straight	120V AC, 240V AC	0.48	Straight	5	II	Overcurrent, Overvoltage, Short Circuit	Black	00000000	000000
12V DC	3	Positive	2.1	5.5	Straight	120V AC, 240V AC	1	Straight	5	II	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
12V DC	5	Positive	2.1	5.5	Straight	120V AC, 240V AC	1.4	Straight	5	II	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
IEC C14 Input × Barrel Output
12V DC	1.6	Positive	2.1	5.5	Straight	120V AC, 240V AC	0.48	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
12V DC	3	Positive	2.1	5.5	Straight	120V AC, 240V AC	1	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
12V DC	5	Positive	2.1	5.5	Straight	120V AC, 240V AC	1.4	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
12V DC	7	Positive	2.1	5.5	Straight	120V AC, 240V AC	1.2	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
IEC C14 Input × 4-Pin Circular DIN Output
12V DC	12.5	__	__	__	Straight	120V AC, 240V AC	2.2	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	00000
12V DC	16	__	__	__	Straight	120V AC, 240V AC	2.8	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	000000
IEC C14 Input × 6-Pin Molex Mini-Fit Output
12V DC	20	__	__	__	Straight	120V AC, 240V AC	3.3	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	000000
12V DC	24	__	__	__	Straight	120V AC, 240V AC	3.9	Straight	5	I	Overcurrent, Overvoltage, Short Circuit	Black	00000000	000000

Medical-Grade AC to DC Adapters

IEC C8 Input and 4-Pole 4-Pin Circular DIN Output

IEC C14 Input and 4-Pole 4-Pin Circular DIN Output

IEC C14 Input and 6-Pole Molex Mini-Fit Output

IEC C14 Input and 10-Pole Molex Mini-Fit Output

4-Pole 4-Pin Circular DIN Output

IEC C8 Input

Positive

IEC C14 Input

6-Pole Molex Mini-Fit Output

10-Pole Molex Mini-Fit Output

To run DC-powered lab and medical equipment from your outlet, add a power cord with the plug style and length you need. These adapters meet strict IEC, UL, or ANSI/AAMI standards for use with medical devices. They also have a Means of Protection rating of 2xMOPP, which is the highest level of shock protection available for medical-grade power supplies, so in addition to using them with lab and medical equipment, you can use them with devices that come into contact with patients.

Unlike adapters with bodies that plug directly into an outlet, the body of these adapters rests on a desk or the floor, so it won’t block multiple outlets. Adapters with an IEC C8 input connection require power cords with a C7 socket. Those with an IEC C14 input connection require power cords with a C13 socket.

When selecting an adapter, make sure the DC voltage and amps for the pin output connection can handle the requirements of your device. Choosing a DC voltage and amps that are much higher than you need will not improve performance.

These adapters use switching regulation, which means they produce the stated voltage despite fluctuations in your outlet’s power and the power being drawn by your device. It also means they won’t get too hot.

If you exceed the maximum voltage or load, these adapters shut down to protect both the adapters and the connected equipment.

All of these adapters meet European safety standards. Adapters with Class II shock protection have two levels of insulation to prevent electrical shocks. Those with Class I shock protection prevent electrical shocks with a combination of insulation and a protective ground.

Barrel/Pin Output Connection
Voltage	Current, A	Polarity	End Shape	Voltage	Current, A	End Shape	Lg., ft.	Shock Protection Class	Protections Provided	Specifications Met	Color		Each
Nondetachable-Cord
IEC C8 Input × 4-Pole 4-Pin Circular DIN Output
12V DC	5	Positive	Straight	120V AC, 240V AC	2	Straight	3.4	I	Overload, Overvoltage, Overtemp, Short Circuit	CE Marked, ANSI/AAMI ES60601-1, UL/CSA/IEC/EN 60601-1	Black	0000000	000000
12V DC	5	Positive	Straight	120V AC, 240V AC	2	Straight	3.4	II	Overload, Overvoltage, Overtemp, Short Circuit	CSA-C22.2 No.60601 3rd edition (2 x MOPP), EN/IEC60601-1, ANSI/AAMI ES60601-1	Black	0000000	00000
12V DC	8.8	Positive	Straight	120V AC, 240V AC	1.3	Straight	3.28	II	Overload, Overvoltage, Overtemp, Short Circuit	CE Marked, 60950-1, IEC/ES/CSA/EN60601-1, IEC/UL/CSA/EN62368-1, IEC60601-1-11	Black	0000000	000000
IEC C14 Input × 4-Pole 4-Pin Circular DIN Output
12V DC	13.3	Positive	Straight	120V AC, 240V AC	2.5	Straight	3.44	I	Overvoltage, Short Circuit	CE Marked, UL60601-1, EN60601-1, IEC60601-1	Black	0000000	000000
IEC C14 Input × 6-Pole Molex Mini-Fit Output
12V DC	20.8	Positive	Straight	120V AC, 240V AC	1.3	Straight	2.62	I	Overload, Overvoltage, Overtemp, Short Circuit	CE Marked, 60950-1, IEC/ES/CSA/EN60601-1, IEC/UL/CSA/EN62368-1	Black	0000000	000000
IEC C14 Input × 10-Pole Molex Mini-Fit Output
12V DC	25	Positive	Straight	120V AC, 240V AC	3	Straight	2.62	I	Overload, Overvoltage, Overtemp, Short Circuit	CE Marked, 60950-1, IEC/ES/CSA/EN60601-1, IEC/UL/CSA/EN62368-1, IEC60601-1-11	Black	0000000	000000

International AC to DC Adapter Cords

Adapter

AS 3112 Plug (Australia and New Zealand)

BS 1363 Plug (United Kingdom )

CEE 7/16 Plug (European Union)

NEMA 1-15 Plug (North America)

Negative

Positive

Swap the plug to match the outlet of the region you’re in instead of using separate cords for each country. These adapter cords convert AC voltage to power DC electronics. Designed with switching regulation, they maintain consistent voltage during power fluctuations and don’t get too hot. They meet U.S., Canadian, European, Australian, New Zealand, and Chinese safety standards.

A limited power source (LPS) low-voltage output decreases the risk of electric shock if something fails inside these cords. Class II shock protection means they have two levels of insulation. These cords meet U.S. DOE (Department of Energy) Level VI standards for energy efficiency when they're in-use, as well as when they're plugged in but not in use.

Choose an adapter cord with an output voltage that matches the voltage of your device. The polarity of the adapter cord and your device must also be the same. Look for the polarity illustration on your device or the adapter cord you’re replacing and pick a cord to match.

Barrel Output Connection					Straight-Blade Input Connection
Voltage	Current, A	End ID, mm	End OD, mm	End Shape	Voltage	Current, A	End Shape	Lg., ft.	Protections Provided	Color		Each
Negative Polarity
AS 3112, BS 1363, CEE 7/16, × NEMA 1-15 Plugs
12V DC	2	2.1	5.5	Straight	120V AC, 240V AC	0.8	90° Elbow	5	Overvoltage, Short Circuit	Black	0000000	000000
12V DC	2	2.5	5.5	Straight	120V AC, 240V AC	0.8	90° Elbow	5	Overvoltage, Short Circuit	Black	0000000	00000
Positive Polarity
AS 3112, BS 1363, CEE 7/16, × NEMA 1-15 Plugs
12V DC	2	2.1	5.5	Straight	120V AC, 240V AC	0.8	90° Elbow	5	Overvoltage, Short Circuit	Black	0000000	00000
12V DC	2	2.5	5.5	Straight	120V AC, 240V AC	0.8	90° Elbow	5	Overvoltage, Short Circuit	Black	0000000	00000

DC to AC Adapter Cords

With One Outlet

With Two Outlets and One USB A Port

With Two Outlets, One USB A Port, and One USB C Port

NEMA 5-15 Outlet

Plug these cords into a vehicle socket to charge devices that run on AC voltage. Also known as inverters or converters, they prevent damage from overloads.

	Vehicle Connection		Straight-Blade Connection				USB Connection				Body				Color
Total No. of Outlets	Voltage	End Shape	NEMA Style	Voltage	Wattage	End Shape	Current, A	Type (No. of Ports)	End Shape	Lg., ft.	Ht.	Wd.	Dp.	Includes	Body	Cord		Each
1	12V DC	Straight	5-15	120V AC	150W	Straight	__	__	__	3 1/2	1 3/4"	3 3/4"	5 3/4"	__	Red	Black	0000000	000000
2	12V DC	Straight	5-15	120V AC	425W	Straight	2.1	A (1)	Straight	2	2 5/8"	5"	6 1/2"	Battery Cable with Alligator Clips	Yellow/White	Yellow	0000000	00000
2	12V DC	Straight	5-15	120V AC	400W	Straight	2.4 3	A (1) C (1)	Straight	3	2 1/2"	5 3/4"	7"	Battery Cable with Alligator Clips	Black/Yelow	Black	0000000	00000