Skip to main content
Log in
STMicroelectronics L4978D013TR — Logic ICs

STMicroelectronics L4978D013TR Step-Down Regulator, 2A

MPNL4978D013TR
End of Life

STMicroelectronics L4978D013TR, Step-Down Buck Regulator, Adjustable Output 3.3V to 50V, 2A, 100kHz to 300kHz, Surface Mount, 16-SOIC Wide (7.50mm), -40°C to 150°C Junction.

$4.12Ref. price · indicative, final on quote
STMicroelectronics L4978D013TR datasheet (PDF)
Packaging16-SOIC (0.295", 7.50mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

L4978D013TR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input55V
Voltage - output50V
Voltage - output (Min (Fixed))3.3V
Output current2A
Frequency100kHz ~ 300kHz
I/O channels1
Operating temperature-40°C ~ 150°C (TJ)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionStep-Down
TopologyBuck
Case16-SOIC (0.295\", 7.50mm Width)
Output configurationPositive
Synchronous rectifierNo

Product details

Wide-input buck for 12V/24V/48V rails

The STMicroelectronics L4978D013TR is a non-synchronous step-down (buck) switching regulator delivering up to 2A from an input range spanning 8V to 55V. The adjustable output can be set from a 3.3V minimum up to 50V, making it a fit for point-of-load conversion in industrial 24V systems, automotive 12V/24V battery rails, and telecom 48V backplanes. Switching frequency is programmable between 100kHz and 300kHz, letting the designer trade off inductor size against ripple. The 16-SOIC wide-body package (7.50mm width) provides adequate copper area for heat dissipation without requiring a thermal pad.

2A output with external catch diode

Because the L4978D013TR uses non-synchronous rectification, an external Schottky diode must be added between the switch node and ground. This is standard for this regulator class but adds one BOM line and a small PCB footprint.

ROHS3 compliance is confirmed.

Frequently asked questions

Can L4978D013TR be used for 12V input to 5V output?

Yes. With an input range of 8V to 55V, a 12V rail is well within the operating window. The adjustable output can be set to 5V using the external resistor divider. The 2A output capability handles most 5V loads in automotive or industrial systems.

What is the closest pin-compatible alternative to L4978D013TR?

Within the ST L4978 family, the L4978D is the same die in the same 16-SOIC wide package. The L4978D013TR suffix indicates Tape & Reel packaging; the L4978D (tube) is electrically identical. For a wider output current, the L4970 family (3.5A) shares a similar pinout but is not pin-compatible — verify the footprint before substituting.

What is the typical application circuit for L4978D013TR?

A standard buck configuration: input capacitor (100µF electrolytic plus 0.1µF ceramic) on VIN, an external Schottky catch diode from SW to GND, an inductor (47µH to 220µH depending on switching frequency and output voltage), output capacitor (220µF to 470µF low-ESR), and a resistor divider from VOUT to the feedback pin to set the output voltage. The frequency-setting pin connects a resistor to ground to program the 100kHz to 300kHz range.