TLE42744DV33ATMA1 - 3.3V 400mA LDO Regulator | Infineon OPTIREG
MPN: TLE42744DV33ATMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.62 | $16.20 |
| 100 | $1.18 | $118.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.74 | $740.00 |
TLE42744DV33ATMA1 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 very close to the output voltage. Within the broader component taxonomy, LDOs belong to the linear regulator family, which sits under voltage regulators in the power management IC category. Unlike switching regulators, LDOs trade efficiency for simplicity and ultra-low noise, making them the preferred choice for post-regulation after a switching converter or for direct battery-to-rail conversion where EMI must be minimized.
Key features of the TLE42744DV33ATMA1 include a low dropout voltage of approximately 250 mV at full 400 mA load, an operating junction temperature range up to 150 Β°C (Tj), and built-in reverse-polarity protection. The device also integrates reset and watchdog functionality in related family variants, but the V33 fixed-output variant shown here is optimized as a clean standalone 3.3 V rail for microcontroller and sensor supplies. The PG-TO252-3 (DPAK) package provides excellent thermal performance for a 3-pin part, with the tab acting as the main heat-dissipation path.
Architecturally, the TLE42744DV33ATMA1 uses a bipolar pass-transistor topology with a precision bandgap reference and feedback network trimmed at wafer level to achieve Β±2 % output accuracy. The control loop is designed for stable operation with small ceramic output capacitors, simplifying BOM and reducing PCB area. Input transient robustness up to 40 V (and load-dump tolerance per automotive standards) is achieved through integrated protection cells, removing the need for external TVS suppression in many 12 V board-net designs.
Typical applications include automotive body and chassis electronics, 12 V permanent-power rails for ECUs, industrial 24 V bus systems, microcontroller power for sensors and actuators, and replacement of discrete zener-based regulators in power-supply modules. The wide input range and integrated protection make it well suited to any point-of-load where a clean, predictable 3.3 V rail is required.
When designing with this part, choose the output capacitor per the manufacturer datasheet ESR window and place it as close as possible to the VQ pin and tab. Ensure the PCB copper area on the DPAK tab is sized to keep Tj below the maximum rated value at worst-case VIN, VOUT, and IOUT. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for TLE42744DV33ATMA1 β 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 TLE42744DV33ATMA1 (same form factor and footprint) β differing in Package, Protection Features, Topology, RoHS Status, Input Voltage Range.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLE42764DVATMA1
β Drop-Inβ In Stock
$0.74 / Unit
View Datasheet βTLS805B1LDV33
β Drop-Inπ Reference alternative (not in catalog)
TLE42744DV50ATMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$0.74 / Unit
View Datasheet βNCV4275-3.3
β Drop-Inπ Reference alternative (not in catalog)
TL750L05CKC
β Drop-Inπ Reference alternative (not in catalog)
TLE42744DV33ATMA1 Maximum Ratings & Electrical Characteristics
| Output Type | Fixed |
| Output Voltage (Nominal) | 3.3 V |
| Output Voltage Accuracy | Β±2 % |
| Maximum Output Current | 400 mA |
| Input Voltage Range | Up to 40 V |
| Dropout Voltage | 250 mV (typical, at 400 mA) |
| Topology | Bipolar LDO (low dropout linear) |
| Operating Junction Temperature | -40 Β°C to +150 Β°C |
| Protection Features | Overload, short-circuit, overtemperature, reverse polarity |
| Package | PG-TO252-3 (DPAK) |
| Mounting Type | Surface Mount |
| Pin Count | 3 (2 + tab) |
| RoHS Status | Compliant |
| AEC-Q100 | Qualified (automotive grade) |
TLE42744DV33ATMA1 Pin Configuration
| Pin 1 | IN β Input voltage (up to 40 V) |
| Pin 2 | GND β Ground reference |
| Pin 3 | OUT (Tab) β Regulated 3.3 V output (connected to metal tab for thermal dissipation) |
Typical Applications
TLE42744DV33ATMA1 is suitable for 6 applications: Automotive ECU Microcontroller Power Rail, Industrial 24 V Sensor and Actuator Supply, Body and Chassis Electronics (Lighting, HMI, Switch Modules), Battery-Powered Wireless Sensor Nodes, Point-of-Load 3.3 V After Isolated DC-DC, Replacement for Discrete Zener + Pass Transistor Regulators.
Automotive ECU Microcontroller Power Rail
The TLE42744DV33ATMA1's 400 mA output and 40 V input tolerance make it ideal for supplying 3.3 V to automotive ECU microcontrollers directly from a 12 V board net. The integrated reverse-polarity and load-dump protection remove the need for an external TVS in many designs, simplifying BOM. According to the Infineon OPTIREG datasheet, the part is AEC-Q100 qualified and survives ISO 7637-2 transient pulses typical of automotive power environments. Place a 1 Β΅F X7R ceramic on input and 2.2 Β΅F on output within 5 mm of the pins, and ensure at least 1 inΒ² of copper on the DPAK tab to keep Tj in spec at 12 V/400 mA continuous load.
Recommended
Industrial 24 V Sensor and Actuator Supply
In industrial 24 V systems, the TLE42744DV33ATMA1 provides a clean 3.3 V rail for sensors, op-amps, and low-power microcontrollers drawing up to 400 mA. Its 40 V absolute-max input withstands 24 V nominal plus transient excursions without external suppression. Unlike a switching regulator, the bipolar LDO adds zero switching noise to analog signal chains, preserving ADC and transducer accuracy. Verify thermal dissipation: at VIN = 30 V and 400 mA the part dissipates ~10.7 W, requiring substantial copper on the DPAK tab or a small clip-on heatsink to stay within the 150 Β°C Tj limit.
Recommended
Body and Chassis Electronics (Lighting, HMI, Switch Modules)
Body-control modules for lighting drivers, HMI keypads, and mirror/window switches need a rugged 3.3 V rail that tolerates load-dump and reverse-battery events. The TLE42744DV33ATMA1 integrates reverse-polarity protection and Β±2 % output accuracy, eliminating discrete zener regulators and reducing PCB area. Its 400 mA capacity comfortably powers small MCU + LED-driver combinations. The DPAK-3 package provides the thermal headroom required for underhood and cabin temperature swings from -40 Β°C to +85 Β°C ambient, making it a strong fit for cost-sensitive automotive body electronics.
Recommended
Battery-Powered Wireless Sensor Nodes
For wireless sensor nodes drawing 50-200 mA peaks during transmit, the TLE42744DV33ATMA1 acts as a post-regulator after a switching converter or as a direct 3.3 V rail from a 2S/3S Li-ion pack. Its 250 mV typical dropout extends usable battery runtime when cell voltage sags. While the part's Iq is not the absolute lowest available, the integrated protections and DPAK thermal performance give designers margin for hot environments. Consider pairing with a low-Iq LDO like the TLS805B1LDV33 for always-on sensor domains that share the same battery.
Recommended
Point-of-Load 3.3 V After Isolated DC-DC
Following an isolated DC-DC converter in industrial or medical equipment, the TLE42744DV33ATMA1 provides a clean, low-noise 3.3 V post-regulation stage for microcontroller, communication, and ADC circuits. Its bipolar LDO topology suppresses residual switching ripple from the upstream converter by 60+ dB, ensuring quiet rails for precision analog. The 40 V input tolerance accepts a wide range of post-isolated voltages (5 V to 30 V), and the DPAK package handles moderate dissipation comfortably with proper copper. Estimate dissipation as (VIN_post - 3.3) Γ IOUT and size copper accordingly.
Recommended
Replacement for Discrete Zener + Pass Transistor Regulators
Designers using discrete zener diode + series pass-transistor regulators for 3.3 V rails can replace that two- or three-component stack with the TLE42744DV33ATMA1 to save PCB area, improve output accuracy from Β±5-10 % to Β±2 %, and gain integrated thermal and short-circuit protection. The DPAK-3 footprint and standard pinout (pin 1 = IN, pin 2 = GND, tab = OUT) drop directly into existing layouts. This swap is especially valuable in automotive and industrial designs where the discrete solution offered poor line/load regulation and no fault protection.
Recommended
Recommended Products Summary
Engineering reference data for TLE42744DV33ATMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE42764DVATMA1 | TLS805B1LDV33 | TLE42744DV50ATMA1 | NCV4275-3.3 | TL750L05CKC |
|---|---|---|---|---|---|---|
| Package | PG-TO252-3 (DPAK) | PG-TO252-3 (DPAK) - same | PG-TO252-3 (DPAK) - same | PG-TO252-3 (DPAK) - same | PG-TO252-3 (DPAK) - same | PG-TO252-3 (DPAK) - same |
| Brand | Infineon | Infineon | Infineon | Infineon | onsemi | Texas Instruments |
| Output Voltage | 3.3 V | 3.3 V (also available 5.0 V) | 3.3 V | 5.0 V | 3.3 V | 5.0 V |
| Maximum Output Current | 400 mA | 1 A (+150%) | 50 mA (-87%) | 400 mA (same) | 450 mA (+12%) | 150 mA (-62%) |
| Input Voltage (max) | 40 V | 40 V | 40 V | 40 V | 45 V | 26 V |
| Dropout Voltage (typ) | 250 mV @ 400 mA | 500 mV @ 1 A | 100 mV @ 50 mA | 250 mV @ 400 mA | 280 mV @ 450 mA | 200 mV @ 150 mA |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Higher output current at same footprint and accuracy (vs TLS805B1LDV33)
- Tighter output voltage accuracy with automotive-grade protection (vs TL750L05CKC)
- Broader Infineon OPTIREG ecosystem support (vs NCV4275-3.3)
Design Notes
Estimated: Power dissipation equals (VIN - VOUT) Γ IOUT. At VIN = 12 V, VOUT = 3.3 V, and IOUT = 400 mA, the TLE42744DV33ATMA1 dissipates approximately 3.5 W. With the PG-TO252-3 (DPAK) tab thermally bonded to at least 1 inΒ² of 2 oz copper, junction-to-ambient thermal resistance is typically 50 Β°C/W, giving a 175 Β°C rise above 25 Β°C ambient - too hot. Required mitigation: either reduce VIN closer to VOUT (use a pre-regulator), increase PCB copper to 2-3 inΒ², attach a small clip-on heatsink, or derate IOUT to 200-300 mA continuous. Always verify with a thermal probe on the tab during worst-case operating conditions.
Place the input capacitor (β₯ 1 Β΅F X7R ceramic, 50 V or higher rated) within 5 mm of the IN pin, and the output capacitor (β₯ 2.2 Β΅F X7R ceramic, 10 V rated) within 5 mm of the OUT tab. The DPAK tab is the primary thermal path and must be soldered to a copper pour that extends to at least 1 inΒ² of board area on top, bottom, or both layers with multiple thermal vias. Avoid routing sensitive analog signals under the regulator; the tab and exposed copper can inject small ground-noise transients during load steps.
Do not assume the PG-TO252-3 (DPAK) pinout is universal: in the TLE42744DV33ATMA1, pin 1 = IN, pin 2 = GND, and the tab = OUT, but some cross-brand parts (notably older ON Semi DPAK LDOs and certain TI legacy parts) use pin 1 = IN, pin 2 = OUT, tab = GND, which is reversed. Always re-verify the pinout against the target datasheet before substituting. Also, the input voltage absolute maximum is 40 V - operation above this (including load-dump transients without external TVS suppression) will permanently damage the part. Add a 36 V or 40 V SMAJ-type TVS for harsh automotive environments.
Use a star-ground topology for the TLE42744DV33ATMA1 ground pin, tying it directly to the main ground plane at a single point near the input capacitor return. This minimizes high-current ground bounce from coupling into sensitive analog grounds. Keep the high-current input/output traces short and wide (β₯ 20 mils per 100 mA of load). The tab ground return (because the tab is OUT, not GND, in this part) must be a separate copper pour, electrically isolated from the GND pin copper, to avoid creating a ground loop that would inject noise into the load.
Compliance Information
AEC-Q100 qualified for automotive applications per Infineon OPTIREG family datasheet. RoHS and REACH compliant. Halogen-free per JEDEC JS709B. Conflict-minerals declaration available from Infineon.
