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TLE4251D

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Infineon Technologies Linear Voltage Regulators (LDO), TO-252-4. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TLE4251D

Infineon Technologies · Linear Voltage Regulators (LDO) · TO-252-4

TLE4251D from Infineon Technologies, in a TO-252-4. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 I power_in Input voltage supply, operating range 4 V to 40 V (with VI > VADJ + VDR) and absolute maximum -42 V to 45 V.
2 EN input Enable, high-active input; on above 2 V, off (stand-by) below 0.5 V, operating range 0 V to 40 V.
3 GND power_in Ground.
4 ADJ input Adjust input; connect directly to the reference or via a voltage divider to the reference for reference-proportional output voltages (VQ < Vref), range 0 V to 40 V.
5 Q power_out Output voltage tracking ADJ, up to 400 mA; must be blocked by a capacitor CQ ≥ 22 μF with ESR ≤ 3 Ω to GND.

Key specifications

Parameter Value
Manufacturer Infineon Technologies
Package TO-252-4
Category Power Management ICs
Pins 5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output voltage tracking accuracy ΔVQ -10 10 mV VI < 13.5 V; -40 °C < Tj < 125 °C; 1 mA < IQ < 300 mA 6
Output voltage tracking accuracy ΔVQ -25 25 mV 6 V < VI < 28 V; 1 mA < IQ < 300 mA 6
Drop voltage Vdr 280 520 mV IQ = 300 mA; VADJ > 4 V; Enable ON 6
Output current IQ 400 450 800 mA Tj ≤ 125 °C 6
Output capacitor CQ 22 μF ESR ≤ 3 Ω at 10 kHz 6
Current consumption Iq 10 20 mA IQ = 300 mA 6
Current consumption Iq 230 300 μA IQ < 1 mA; Tj < 85 °C; VEN in ON state 6
Quiescent current (stand-by) Iq 2 μA VEN = 0 V; Tj < 85 °C 6
Load regulation ΔVQ -35 5 35 mV 5 mA < IQ < 300 mA; VI = 6 V; VADJ = 5 V 6
Line regulation ΔVQ -25 10 25 mV 12 V < VI < 32 V; IQ = 5 mA 6
Power Supply Ripple Rejection PSRR 60 dB fr = 100 Hz; Vr = 0.5 Vpp; VADJ = 5 V; CQ = 22 μF Tantalum 6
Input biasing current IADJ 0.1 0.5 μA VADJ = 5 V 6
Enable on voltage range VEN ON 2 V VQ ON 7
Enable off voltage range VEN OFF 0.5 V VQ ≤ 0.1 V 7
Enable input current IEN 5 40 70 μA VEN = 5 V 7
Input voltage VI -42 45 V -40 °C < Tj < 150 °C 4
Output voltage VQ -2 45 V -40 °C < Tj < 150 °C 4
Adjust voltage VADJ -42 45 V -40 °C < Tj < 150 °C 4
Enable voltage VEN -42 45 V -40 °C < Tj < 150 °C 4
Junction temperature Tj -40 150 °C 4
Storage temperature Tstg -50 150 °C 4
Thermal resistance junction case Rthjc 4 K/W TLE 4251 D 4
Thermal resistance junction ambient Rthja 78 K/W TLE 4251 D; worst case, zero airflow; PCB 80 × 80 × 1.5 mm3, heat sink area 300 mm2 4
Input voltage VI 4 40 V VI > VADJ + VDR 5
Adjust input voltage VADJ 2.5 40 V 5
Adjust input voltage VADJ 0 2.5 V VQ ≤ VADJ + ΔVQ 5
Enable input voltage VEN 0 40 V 5
Junction temperature Tj -40 150 °C 5

CAD (KiCad official)

  • Symbol: TLE4251D
  • Footprint: Package_TO_SOT_SMD:TO-252-4
  • 3D model: TO-252-4 (KiCad packages3D, STEP)
  • 3D model files: tle4251d-etched.step / tle4251d-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tle4251d.step / tle4251d.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Infineon Technologies datasheet (13 pp, sha256 7bb6228548d61b76, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF