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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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tle4251d.step/tle4251d.glbare 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).
# 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](docs/tle4251d-datasheet.pdf) (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](docs/tle4251d-datasheet.pdf)