TLE42644GHTSA3 - 5V 100mA LDO Regulator | Infineon OPTIREG
MPN: TLE42644GHTSA3 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.24 | $2.24 |
| 10 | $2.02 | $20.20 |
| 100 | $1.81 | $181.00 |
| 500 | $1.59 | $795.00 |
| 1,000 | $1.37 | $1,370.00 |
TLE42644GHTSA3 Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally above the output voltage. In the broader system hierarchy, an LDO is a sub-category of linear regulator, which itself belongs to the family of voltage regulators and ultimately to power management ICs (PMICs). LDOs are preferred over switching regulators in noise-sensitive analog rails because they introduce no switching ripple, at the cost of lower efficiency at large input-to-output differentials.
The TLE42644GHTSA3 features a 5 V fixed output, 100 mA continuous load capability, low quiescent current (40 µA), and integrated protection against reverse polarity, short circuit, overload, and overtemperature. Its PG-SOT223-4 package combines a small footprint with a thermal tab that allows the die to dissipate heat through the copper pad on the PCB.
Internally, the device uses a bipolar process with a bandgap reference and a PNP pass element, achieving dropout performance suitable for automotive cranking transients. According to the Infineon datasheet, the regulator maintains regulation through input voltage dips down to 6 V while supplying a 100 mA load at 5 V out.
Typical applications include automotive body and chassis ECUs, sensor and actuator supplies, infotainment standby rails, and industrial 24 V bus subsystems. It is qualified to AEC-Q100, making it suitable for under-hood and cabin modules where reliability over wide temperature ranges is required.
When designing with this part, place a 100 nF ceramic bypass capacitor close to the input pin and a low-ESR 1 µF to 10 µF capacitor on the output to ensure clean transient response. The thermal tab must be soldered to a copper pour to keep the junction temperature within safe limits at full load.
Drop-in alternatives for TLE42644GHTSA3 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLE42644GHTSA3 (same form factor and footprint) — differing in Protection Features, Package, Output Voltage Accuracy, Input Voltage Range, Output Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLE42644G
✅ Drop-In📋 Reference alternative (not in catalog)
TLE4264-2G
✅ Drop-In📋 Reference alternative (not in catalog)
TLE42662GHTMA2
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →TLE42744DV50ATMA1
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →TLE42644GHTSA3 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Series | OPTIREG LINEAR |
| Regulator Type | LDO (Low-Dropout), Fixed Positive |
| Number of Outputs | 1 |
| Nominal Output Voltage | 5 V |
| Output Voltage Accuracy | ±2% (load), ±3% (overall) |
| Maximum Output Current | 100 mA |
| Maximum Input Voltage | 45 V |
| Quiescent Current | 40 µA |
| Operating Temperature Range | -40°C to +150°C (junction) |
| Package | PG-SOT223-4 (TO-261-4, 3+Tab) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| AEC-Q100 Qualified | Yes |
| Protection Features | Reverse polarity, short circuit, overload, overtemperature |
| Packaging | Tape & Reel (T/R) |
TLE42644GHTSA3 Pin Configuration
| Pin 1 | IN — Input voltage (up to 45 V) |
| Pin 2 | GND — Ground |
| Pin 3 | OUT — Regulated 5 V output |
| Pin 4 | TAB — Ground / thermal tab (must be soldered to PCB copper pour) |
Typical Applications
TLE42644GHTSA3 is suitable for 6 applications: Automotive Body Control Module (BCM) Standby Rail, Sensor and Actuator Power Supply in ADAS Modules, Industrial 24 V Bus Sensor Power, Infotainment Head-Unit Standby Supply, Battery-Backed Telematics Control Unit (TCU) Rail, HVAC Control Panel Microcontroller Supply.
Automotive Body Control Module (BCM) Standby Rail
The TLE42644GHTSA3 is well suited for body control module standby rails where 5 V must be maintained from a 12 V battery with minimal quiescent current. Its 40 µA Iq allows the BCM to remain CAN-active in sleep mode without draining the battery, while the 45 V input rating tolerates load-dump transients up to the ISO 7637-2 pulse profile. AEC-Q100 qualification supports under-dash and under-hood placement, and the PG-SOT223-4 tab enables soldering to chassis ground copper for thermal relief. Compared with discrete Zener + BJT solutions, the integrated regulator reduces BOM count, provides overtemperature shutdown, and improves output accuracy to ±2% across load.
Recommended
Sensor and Actuator Power Supply in ADAS Modules
In ADAS camera and radar modules, the TLE42644GHTSA3 powers low-current analog and digital sensors requiring clean 5 V from a noisy 12 V battery rail. The LDO's lack of switching ripple preserves signal integrity for SAR ADCs and ultrasonic transducer front-ends, while its 45 V input rating absorbs load-dump events. Its 40 µA quiescent current supports parking-mode operation where the ECU draws under 100 µA total. The PG-SOT223-4 footprint fits behind BGA sensor packages, and the exposed thermal tab allows heat sinking through inner PCB layers. AEC-Q100 Grade 1 (-40°C to +125°C ambient) qualification meets OEM automotive reliability requirements.
Recommended
Industrial 24 V Bus Sensor Power
The TLE42644GHTSA3 is a good fit for industrial 24 V bus sensors that need a regulated 5 V rail for microcontrollers and signal-conditioning circuitry. Its 45 V input rating covers the IEC 61131-2 transient envelope for 24 V PLC systems, while the LDO's low 4 µV/√Hz noise floor protects precision analog front-ends. Its 40 µA Iq supports remote sensors powered over the bus that must draw minimal standby current. The PG-SOT223-4 package fits standard 24 V sensor enclosures, and the integrated reverse-polarity and short-circuit protection guard against wiring faults common in field installations.
Recommended
Infotainment Head-Unit Standby Supply
The TLE42644GHTSA3 supplies the always-on 5 V rail in automotive infotainment head units that must remain partially active for key-fob detection and remote-start handshake. Its 40 µA quiescent current keeps the standby budget under OEM limits, and its 45 V input withstands double-battery jump-start events where the rail briefly reaches 24 V. The regulator's ±2% accuracy over load supports RTC and eMMC retention voltage requirements, while AEC-Q100 qualification satisfies the head-unit's automotive reliability spec. The PG-SOT223-4 tab solders to the head-unit's main ground pour, providing sufficient thermal relief at 100 mA continuous load.
Recommended
Battery-Backed Telematics Control Unit (TCU) Rail
In telematics control units that remain connected to the cellular network during vehicle parked mode, the TLE42644GHTSA3 supplies the 5 V rail that powers the modem's sleep controller and accelerometer wake-up circuitry. Its 40 µA Iq directly translates to months-long parking-mode standby life on a 60 Ah battery, while its 45 V input tolerates jump-start events. AEC-Q100 qualification and overtemperature protection support under-seat mounting where ambient temperatures can exceed 85°C. The PG-SOT223-4 footprint fits beside the SIM card holder, and the integrated reverse-polarity block protects against service-tool miswiring during TCU replacement.
Recommended
HVAC Control Panel Microcontroller Supply
The TLE42644GHTSA3 powers the microcontroller and LED backlight driver in automotive HVAC control panels that draw 5 V from the body control module's 12 V distribution. Its 40 µA Iq supports the panel's sleep state where the display remains blank but the CAN bus interface stays active. The 45 V input rating absorbs inductive kick from HVAC blower motor PWM switching, while the LDO's low output noise prevents LED flicker visible on the backlight. AEC-Q100 Grade 1 qualification and the PG-SOT223-4 footprint meet HVAC supplier sourcing requirements across major OEMs.
Recommended
Recommended Products Summary
Engineering reference data for TLE42644GHTSA3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE42644G | TLE4264-2G | TLE42662GHTMA2 |
|---|---|---|---|---|
| Package | PG-SOT223-4 | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same |
| Brand | Infineon | Infineon | Infineon | Infineon |
| Output Voltage | 5 V fixed | 5 V fixed | 5 V fixed | 5 V fixed |
| Maximum Output Current | 100 mA | 100 mA | 100 mA | 120 mA |
| Quiescent Current | 40 µA | 40 µA | ~1 mA (higher) | ~250 µA |
| Maximum Input Voltage | 45 V | 45 V | 45 V | 45 V |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes |
| Watchdog / Reset | No | No | No | Yes (watchdog + reset) |
| Pin-to-Pin Compatible | Yes | Yes | Yes | Yes (same SOT-223 footprint) |
Key Differentiators
- Ultra-low 40 µA quiescent current for standby-sensitive designs (vs TLE4264-2G)
- Integrated reverse-polarity protection block (vs TLE42662GHTMA2)
- Drop-in upgrade path for legacy TLE4264-2 designs (vs TLE4264-2G)
Design Notes
At VIN=12 V, VOUT=5 V, and 100 mA load, the TLE42644GHTSA3 dissipates approximately 0.7 W. The PG-SOT223-4 package has a theta_JA of approximately 70°C/W on a 1 oz copper 1 square inch pour, resulting in a junction temperature rise of ~49°C above ambient. For continuous 100 mA operation at VIN above 18 V, increase the copper pour area or add thermal vias under the exposed tab. Always keep Tj below 150°C per the datasheet maximum.
Place a 100 nF ceramic input bypass capacitor within 5 mm of the IN pin and a low-ESR 1 µF to 10 µF output capacitor within 5 mm of the OUT pin. The exposed tab (pin 4) must be soldered to a copper pour that carries both electrical ground and thermal dissipation. Use multiple thermal vias under the tab to inner ground planes for best thermal performance. Avoid routing high-current traces under the regulator to prevent ground-bounce noise coupling into the feedback loop.
Do not exceed the absolute maximum input voltage of 45 V - automotive load-dump transients can reach 35 V steady-state plus inductive overshoot. The output capacitor's ESR must remain below the datasheet stability limit; use X7R or X5R ceramic capacitors rated for at least 10 V. The reverse-polarity protection block protects the IC but does NOT protect downstream loads - verify the input wiring harness before powering up. Do not operate with VIN below VOUT + dropout or the output will collapse.
Compliance Information
AEC-Q100 qualified per Infineon OPTIREG LINEAR datasheet. RoHS and REACH compliant. Lead-free and halogen-free per DigiKey product page.
