TLE42744GSV33HTMA1 - 3.3V 400mA Auto LDO | Infineon
MPN： TLE42744GSV33HTMA1 ✓ 啟用中TLE42744GSV33HTMA1 概覽
An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input-to-output voltage difference is very small. LDOs sit within the broader hierarchy of voltage regulators, which also includes switching regulators; within voltage regulation they form a distinct subcategory alongside DC-DC converters, supervisors, and battery management ICs. As a power management IC, the LDO's job is to convert a noisy or higher-voltage rail into a clean, low-noise rail for downstream analog, digital, or microcontroller circuitry without introducing switching noise.
Key specifications include a typical 250 mV dropout at full 400 mA load, enabling efficient regulation even when the input rail sags close to 3.3 V. The device features an output voltage accuracy of ±2 % across the full -40 °C to +150 °C junction range, integrated short-circuit and thermal-shutdown protection, and very low quiescent current in normal operation. Its monolithic bipolar design provides excellent line and load transient response, suiting harsh automotive electrical environments.
Typical applications include powering 3.3 V microcontrollers, CAN/LIN transceivers, sensor modules, and body-electronics ECUs in 12 V or 24 V vehicle systems. The wide 40 V input tolerance makes the part tolerant of load-dump transients commonly seen on automotive supplies, while the AEC-Q100 grade supports production under PPAP and IATF 16949 quality systems. Designers also use it in industrial 24 V bus systems requiring a clean local 3.3 V rail.
When designing with the TLE42744GSV33HTMA1, ensure the input capacitor and output capacitor are placed as close to the device as possible to guarantee stability, and confirm that worst-case power dissipation (VIN - 3.3 V) × IOUT plus quiescent loss does not push the junction above the 150 °C limit. The exposed tab must be soldered to a sufficient copper pour for heat removal.
This page synthesizes distributor pricing, drop-in compatible alternatives from the TLE42744 family and competitor pinouts, application circuits, and practical design notes that are not bundled together in the manufacturer datasheet, giving engineers a single source for sourcing, replacement, and layout guidance.
直接替換替代品，適用於 TLE42744GSV33HTMA1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TLE42744GSV33HTMA1 （相同外形與佔位） — 差異在於 Package, Protection Features, Input Voltage Range, Output Voltage Accuracy, Operating Temperature Range.
TLE42744DV50ATMA1
✅ 直接替換聯絡詢價
查看資料表 →TLE42744GSV33
✅ 直接替換📋 參考替代品（不在目錄中）
TLE42644GHTMA1
✅ 直接替換聯絡詢價
查看資料表 →TLE42644GHTSA3
✅ 直接替換聯絡詢價
查看資料表 →TLS850B0TEV50ATMA1
✅ 直接替換聯絡詢價
查看資料表 →TLS205B0LDV50XUMA1
✅ 直接替換聯絡詢價
查看資料表 →TLE42744GSV33HTMA1 最大額定值與電氣特性
| 輸出類型 | Fixed |
| 輸出電壓 | 3.3 V |
| Output Voltage Accuracy | ±2 % |
| 最大輸出電流 | 400 mA |
| 輸入電壓範圍 | 4.7 V to 40 V |
| 壓降電壓 | 250 mV (typical at 400 mA) |
| Operating Temperature (Junction) | -40 °C to +150 °C |
| 封裝 | PG-SOT223-4 (TO-261-4, 3+Tab) |
| 安裝類型 | Surface Mount |
| Protection Features | Short-circuit, Thermal Shutdown |
| Automotive Qualification | AEC-Q100 |
| RoHS 狀態 | Compliant |
TLE42744GSV33HTMA1 腳位配置
| 腳位 1 | IN — Input supply voltage (4.7 V to 40 V) |
| 腳位 2 | GND — Ground reference |
| 腳位 3 | OUT — Regulated 3.3 V output |
| 腳位 4 | TAB — Thermal pad / GND (electrically connected to GND) |
典型應用
TLE42744GSV33HTMA1 適用於 6 應用s: Automotive 3.3 V ECU Power Rail, CAN/LIN Transceiver Supply, Industrial 24 V Sensor Module Power, Body Electronics Lighting Module, Battery Management Secondary Rail, HVAC Control Board Power.
Automotive 3.3 V ECU Power Rail
The TLE42744GSV33HTMA1's 3.3 V fixed output and 400 mA rating directly power automotive microcontroller units (e.g., Aurix TC2xx family) and ECU logic rails from the 12 V vehicle bus. Its 40 V absolute-maximum input tolerates load-dump events up to ISO 7637-2 pulse A, while the ±2 % accuracy keeps the MCU core voltage inside spec across the -40 °C to +150 °C range. AEC-Q100 qualification is mandatory for OEM ECU designs, and the PG-SOT223-4 tab provides a low thermal resistance path to dissipate (12 V - 3.3 V) × 0.4 A = 3.5 W at full load with proper copper layout. This makes it a first-choice post-regulator after a pre-regulator or directly off a clean 12 V bus.
推薦
CAN/LIN Transceiver Supply
CAN and LIN transceivers (such as Infineon's TLE7251-3LE or NXP's TJA1050) require a stable 3.3 V or 5 V supply for the logic interface. The TLE42744GSV33HTMA1 provides a low-noise 3.3 V rail that prevents bus-bit corruption caused by supply transients, while its 250 mV typical dropout at 400 mA keeps regulation tight even during cranking events when the battery sags to 6 V. Its short-circuit protection guards against wiring harness faults in the vehicle body network, and the AEC-Q100 grade supports OEM PPAP submissions. Recommended decoupling: 100 nF ceramic near the transceiver VCC pin plus a 1 µF bulk capacitor on the regulator output.
推薦
Industrial 24 V Sensor Module Power
In industrial 24 V PLC backplanes and sensor hubs, the TLE42744GSV33HTMA1 converts the 24 V bus down to a clean 3.3 V for analog sensors, ADCs, and 4-20 mA loop electronics. Its 40 V maximum input comfortably exceeds the 24 V nominal plus transient tolerance to IEC 61131-2 surge events, while the 250 mV dropout at 400 mA ensures regulation even at the lower 19 V end of the 24 V tolerance window. The ±2 % accuracy directly improves ADC reference stability, and the integrated thermal shutdown protects against fan-cooling failure in sealed industrial cabinets. Designers can parallel two devices for redundancy in safety-relevant applications.
推薦
Body Electronics Lighting Module
Body-electronics modules such as LED drivers, mirror controllers, and seat-control ECUs use the TLE42744GSV33HTMA1 as a 3.3 V housekeeping rail to power microcontrollers and logic devices from the 12 V battery bus. The 400 mA current capability easily handles a small MCU plus CAN/LIN transceiver plus a few indicator LEDs, while the wide input range absorbs load-dump transients on cranking. The exposed-tab PG-SOT223-4 package is drop-in compatible with the 5.0 V variant TLE42744DV50ATMA1 for designs that need 5 V auxiliary rails, simplifying PCB reuse across 3.3 V and 5 V product variants. AEC-Q100 grade supports OEM production without additional qualification work.
推薦
Battery Management Secondary Rail
Battery management systems (BMS) for e-bikes, e-scooters, and small electric vehicles require a low-noise 3.3 V rail to power the monitoring MCU and ADCs in addition to the high-voltage battery monitoring circuits. The TLE42744GSV33HTMA1 supplies this housekeeping rail directly from the 12 V or 24 V system bus with 400 mA capacity, and its ±2 % accuracy enhances coulomb-counting ADC precision. The 40 V input maximum supports 24 V battery packs comfortably, and the AEC-Q100 grade (even for non-automotive applications) signals high reliability. Integrated thermal shutdown is critical in tightly-packaged battery enclosures where ambient temperature can rise significantly.
推薦
HVAC Control Board Power
HVAC climate-control modules in vehicles and industrial enclosures use the TLE42744GSV33HTMA1 to power the 3.3 V logic rail that runs the touchscreen MCU, communication transceivers, and sensor conditioning. Its 40 V input tolerance handles cranking and load-dump events on the 12 V vehicle bus, while the -40 °C to +150 °C junction rating covers under-dash thermal extremes in cold-start winter conditions and high-ambient summer conditions. The 250 mV dropout at 400 mA supports cold-start operation when battery voltage sags to 6 V, keeping the HVAC controller responsive even during engine crank. AEC-Q100 grade supports OEM HVAC module production programs.
推薦
推薦產品摘要
工程參考資料，適用於 TLE42744GSV33HTMA1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TLE42744DV50ATMA1 | TLE42744GSV33 | TLE42644GHTMA1 | TLS850B0TEV50ATMA1 | TLS205B0LDV50XUMA1 |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-SOT223-4 | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 family - same | PG-SOT223-4 family - same | PG-SOT223-4 family - same |
| Output Voltage | 3.3 V | 5.0 V | 3.3 V | 5.0 V (typical TLE42644 family) | 5.0 V | 5.0 V |
| Maximum Output Current | 400 mA | 400 mA | 400 mA | 200 mA | 500 mA | 500 mA |
| Input Voltage Range | 4.7 V to 40 V | 4.7 V to 40 V | 4.7 V to 40 V | 5.5 V to 45 V (TLE42644 family) | 3.0 V to 40 V | 2.5 V to 40 V |
| Dropout Voltage (typ) | 250 mV at 400 mA | 250 mV at 400 mA | 250 mV at 400 mA | 280 mV at 200 mA (TLE42644 family) | 100 mV at 500 mA (TLS850 family) | 320 mV at 500 mA (TLS205 family) |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | Standard (no AEC marking) | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Operating Temperature | -40 °C to +150 °C | -40 °C to +150 °C | -40 °C to +150 °C | -40 °C to +150 °C | -40 °C to +125 °C (TLS850 family) | -40 °C to +125 °C (TLS205 family) |
主要差異化特點
- Pin-compatible 5.0 V variant for design reuse (對比TLE42744DV50ATMA1)
- Higher output current than TLE42644 family (對比TLE42644GHTMA1)
- AEC-Q100 qualified for automotive PPAP (對比TLE42744GSV33 (standard grade))
設計說明
Estimated worst-case thermal analysis at VIN=24 V, VOUT=3.3 V, IOUT=400 mA: power dissipation PD = (24 - 3.3) × 0.4 + VIN × IQR ≈ 8.3 W (ignoring quiescent). With PG-SOT223-4 theta_JA approximately 55 C/W on a standard 1 oz 4-layer 1 square inch copper pad, junction temperature rise is about 8.3 × 55 = 457 °C - far exceeding the 150 °C limit. Designers must use a minimum 1 square inch copper pour on the tab AND extend the pad to at least 2-4 square inches of copper area, or reduce VIN or IOUT, to keep Tj within spec. Always calculate thermal worst case for the application's specific VIN rail.
Place input capacitor (≥1 µF low-ESR ceramic, X7R) directly at pin 1 with the loop area minimized to ground. Place output capacitor (≥2.2 µF low-ESR ceramic, X7R) directly at pin 3 to ground. The PG-SOT223-4 thermal tab MUST be soldered to a top-layer copper pour that extends via arrays to the internal ground plane. Without the tab soldered, thermal resistance rises dramatically and the device will trigger thermal shutdown at much lower loads than the 400 mA rating.
Do not operate the TLE42744GSV33HTMA1 below the 4.7 V minimum input - dropout regulation is not guaranteed below this threshold. Do not exceed 40 V input, even transiently, as the absolute-maximum rating does not include load-dump margins beyond the part's design. For automotive 12 V systems with load-dump, verify that upstream TVS protection clamps transients below 40 V. The output capacitor's ESR must remain below the datasheet's stability limit (typically <200 mΩ); using exclusively ceramic X7R is safe, but adding a small tantalum in parallel can introduce instability and should be avoided.
合規資訊
AEC-Q100 qualified per Infineon product page. RoHS and REACH compliant per DigiKey/Mouser listings. Halogen-free status not explicitly stated in retrieved data.
