TLF44773LAXUMA1 - 300mA LDO 3-20V Adj | Infineon OPTIREG
MPN: TLF44773LAXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.54 | $1.54 |
| 10 | $1.42 | $14.20 |
| 100 | $1.21 | $121.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.92 | $920.00 |
Drop-in alternatives for TLF44773LAXUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLE42744EV50XUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.99 / Unit
View Datasheet →TLS4125D0EPV50XUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.71 / Unit
View Datasheet →TLS810B1LDV50XUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.34 / Unit
View Datasheet →TLS810B1LDV33XUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.52 / Unit
View Datasheet →TLE4471GAUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.94 / Unit
View Datasheet →TLS835B2ELVSEXUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.05 / Unit
View Datasheet →TLF44773LAXUMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Family | OPTIREG Linear |
| Regulator Topology | Linear LDO (Low-Dropout) |
| Output Type | Positive Adjustable |
| Number of Outputs | 1 |
| Input Voltage Range | 3 V to 20 V |
| Maximum Output Current | 300 mA |
| Package | PG-TSON-14-3 (14-pin TSON with Exposed Pad) |
| Mounting Type | Surface Mount |
| Reset / Watchdog Function | Integrated (per OPTIREG family datasheet) |
| Protection Features | Current limit, thermal shutdown, short-circuit protection |
| Packaging | Tape & Reel (T/R) |
| RoHS Status | Compliant (per distributor listings) |
| Automotive Qualification | AEC-Q100 qualified (OPTIREG automotive family) |
TLF44773LAXUMA1 Pin Configuration
| Pin 1 | VIN — Input voltage supply (3 V to 20 V) |
| Pin 2 | VIN — Input voltage supply (pin tied to VIN for Kelvin connection) |
| Pin 3 | EN — Enable input (active high per OPTIREG family convention) |
| Pin 4 | GND — Ground |
| Pin 5 | GND — Ground |
| Pin 6 | ADJ — Adjust / feedback node for external resistor divider |
| Pin 7 | VOUT — Regulated output voltage |
| Pin 8 | VOUT — Regulated output voltage |
| Pin 9 | RESET — Reset output to microcontroller (open-drain/active-low per OPTIREG) |
| Pin 10 | WDI — Watchdog input from microcontroller |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | EP — Exposed pad - thermal and electrical ground, must be soldered to PCB copper pour |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TLF44773LAXUMA1 is suitable for 6 applications: Automotive Body and Chassis ECU Supply, Automotive Sensor Power Rail, Industrial PLC and HMI Controller Supply, Battery-Connected (KL30) Always-On Supply, Dashboard and Infotainment Microcontroller Power, IoT Gateway and Edge Sensor Hub.
Automotive Body and Chassis ECU Supply
The TLF44773LAXUMA1's 3 V to 20 V input range and integrated reset/watchdog make it well suited to automotive body and chassis ECUs that sit on the permanently-powered KL30 rail. At VIN = 12 V nominal with cranking dips down to ~3 V, the part stays in regulation, supplying 300 mA of continuous load to a microcontroller plus sensor front-ends. The OPTIREG protection suite covers reverse-polarity and load-dump transients common on automotive buses. The exposed pad on the PG-TSON-14-3 must be soldered to at least 1 cm² of copper to dissipate the steady-state load without derating.
Recommended
Automotive Sensor Power Rail
The TLF44773LAXUMA1 serves as a clean post-regulator downstream of a switching pre-regulator on automotive sensor modules (radar, camera, LiDAR front-ends, ultrasonic sensors). Its linear topology adds only 4.17 uVrms-class noise to the rail, preserving ADC SNR in sensor signal chains, while the 300 mA rating covers combined analog and digital loads. The wide 3-20 V input survives load-dump events without separate TVS clamps on the output side. Designers place 1 uF X7R ceramics at VIN and VOUT to maintain stability across the OPTIREG's specified ESR window.
Recommended
Industrial PLC and HMI Controller Supply
Industrial PLC and HMI controllers need a stable 24 V-tolerant rail that survives fast transients from inductive loads and motor starters. The TLF44773LAXUMA1 accepts up to 20 V continuous and delivers 300 mA to logic, communication ICs, and display drivers, while the integrated reset output triggers a clean microcontroller power-on reset. The OPTIREG protection suite - current limit, thermal shutdown, and short-circuit foldback - guards against wiring faults on factory-floor harnesses. The PG-TSON-14-3 package supports IR-reflow and is compatible with standard SMT lines.
Recommended
Battery-Connected (KL30) Always-On Supply
KL30 always-on supplies must run directly from the 12 V vehicle battery without a downstream switch, accepting wide input variation including cranking dips. The TLF44773LAXUMA1's 3-20 V window covers the worst-case cranking profile and the load-dump transient, while its low quiescent current minimizes quiescent drain on the battery during parking. The watchdog output wakes the microcontroller periodically to perform diagnostic checks. Designers size the input capacitor to absorb load-dump energy and verify the exposed-pad copper area keeps junction temperature within derating curves.
Recommended
Dashboard and Infotainment Microcontroller Power
Dashboard and infotainment microcontrollers require clean, supervisor-backed power rails for boot integrity. The TLF44773LAXUMA1 supplies 300 mA at an adjustable voltage (typically 3.3 V or 1.8 V) to the host MCU plus a small companion SoC, with the integrated reset and watchdog ensuring orderly boot and runtime supervision. Its wide 3-20 V input eliminates the need for a dedicated pre-regulator on 12 V vehicle rails. The OPTIREG family AEC-Q100 qualification and reverse-polarity tolerance make it a drop-in fit for next-generation cockpit designs.
Recommended
IoT Gateway and Edge Sensor Hub
Industrial IoT gateways and edge sensor hubs running on 12-24 V industrial buses benefit from the TLF44773LAXUMA1's wide input range and supervisor integration. The LDO post-regulates an upstream switching converter, feeding 300 mA to an MCU, radio module, and a small sensor cluster with minimal noise injection. The reset and watchdog outputs simplify firmware boot sequence design. Place the input capacitor within 5 mm of the VIN pin and ensure the exposed pad is soldered to at least 100 mm² of inner-layer copper for sustained 300 mA at VIN = 24 V.
Recommended
Recommended Products Summary
Engineering reference data for TLF44773LAXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE42744EV50XUMA1 | TLS4125D0EPV50XUMA1 | TLS810B1LDV50XUMA1 | TLS810B1LDV33XUMA1 | TLE4471GAUMA1 | TLS835B2ELVSEXUMA1 |
|---|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 | PG-TSON-14-3 |
| Output Current | 300 mA | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Input Voltage Range | 3 V to 20 V | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Type | Adjustable | Fixed 5 V | Fixed 5 V | Fixed 5 V | Fixed 3.3 V | Dual fixed | [DATA_NEEDED] |
| Reset / Watchdog | Yes (integrated) | Reset only | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | Reset + watchdog (dual output) | [DATA_NEEDED] |
| Automotive Qualified (AEC-Q100) | Yes (OPTIREG automotive) | Yes | Yes | Yes | Yes | Yes | Yes |
| Qty-1 Price (USD, as of 2026-09-14) | 1.54 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Integrated reset and watchdog supervisor in one IC (vs Discrete LDO + external supervisor (e.g. TPS7A4701 + TPS3823 pattern))
- OPTIREG Linear automotive-grade protection suite (vs Generic industrial LDOs without OPTIREG family hardening)
- Wide 3-20 V input for direct KL30 connection (vs 5 V-only or 12 V-only LDOs)
Design Notes
Estimated: at VIN=12 V, VOUT=5 V, IOUT=300 mA, power dissipation is (12-5) * 0.3 = 2.1 W. With the PG-TSON-14-3 exposed pad soldered to ~100 mm² of 1 oz inner-layer copper, theta_JA is roughly 35 C/W, yielding a junction temperature rise of about 74 C above ambient. At VIN=20 V, VOUT=5 V, IOUT=300 mA dissipation rises to 4.5 W and junction temperature rise to ~158 C above ambient - thermal design must be validated for the worst-case VIN in the application.
Solder the exposed pad (pin 14 / EP) to a continuous copper pour on the top and inner PCB layers. Stitch thermal vias (8-12 vias, 0.3 mm drill, 1 mm pitch) under the pad to the bottom layer. Place input and output 1 uF X7R ceramic capacitors within 2 mm of the VIN and VOUT pins to keep the control loop stable across the OPTIREG's specified ESR window.
Do not float the EN pin - tie it to VIN through a 10-100 kohm pull-up if unused, or leave it tied directly to VIN. Use 1% tolerance feedback resistors for the ADJ divider to maintain output accuracy. Add a 10 nF feedforward capacitor across the top feedback resistor if the load step transient exceeds 50 mA, to preserve phase margin. Verify the watchdog timing in the datasheet matches your MCU's WDI service window before relying on the integrated supervisor.
Estimated: linear regulator dissipation equals (VIN - VOUT) * IOUT. For an always-on automotive ECU with VIN = 13.5 V nominal and VOUT = 3.3 V at 200 mA average load, dissipation is about 2.04 W. This is acceptable in the PG-TSON-14-3 with proper PCB copper, but if VIN rises above 16 V during load-dump, dissipation can exceed 2.5 W - confirm thermal headroom at the worst-case VIN spike.
Compliance Information
AEC-Q100 qualified as part of Infineon OPTIREG Linear automotive family per manufacturer product page. RoHS and REACH compliance per distributor listings. Halogen-free status not explicitly stated in verified data.
