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Texas Instruments LM2937IMPX-10
- Part No.:
- LM2937IMPX-10
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
LM2937IMPX-10.pdf
- Description:
- IC REG LINEAR 10V 500MA SOT223-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,404
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Product details
Overview
LM2937IMPX-10 from Texas Instruments is a 10 V, 500-mA low-dropout linear voltage regulator using a PNP pass transistor, featuring 0.5 V typical dropout at full load, ±5% output tolerance over temperature and load, and integrated reverse-battery, 60-V transient, short-circuit, and thermal overload protection. It is designed for automotive power rails where input can dip to VOUT + 1 V and must sustain load dump events.
For engineers reviewing the LM2937IMPX-10 datasheet, LM2937IMPX-10 pinout, LM2937IMPX-10 application, or LM2937IMPX-10 equivalent, key selection criteria include dropout behavior under 500 mA load, stability with 10 µF/≤3 Ω ESR output capacitors, −40°C to 85°C operating range, reverse-polarity survivability, and thermal performance in SOT-223 packages without external heatsinking.
Technical Context
The LM2937IMPX-10 employs a PNP-based LDO architecture enabling regulation down to a 0.5 V (typ) input-to-output differential at 500 mA, with guaranteed ≤1 V dropout across −40°C to 85°C. Its internal bandgap reference and error amplifier maintain 10 V ±5% output accuracy under varying line, load, and temperature conditions.
Protection circuitry includes reverse-battery detection (−30 V DC survivable), 60-V/100-ms transient suppression, current limiting (0.6–1 A), and thermal shutdown triggered above 150°C junction temperature. No enable or UVLO function is present - output follows input until VIN exceeds VOUT + 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 10 V nominal, ±5% tolerance over full load (5–400 mA) and temperature (−40°C to 85°C) |
| Max Output Current | 400 mA (SOT-223 package limit; higher than 500 mA versions use TO-220/KTT) |
| Dropout Voltage | 0.5 V typical at 400 mA; ≤1 V maximum across full operating range |
| Input Voltage Range | Operates from VOUT + 1 V up to 26 V DC; withstands −30 V reverse DC and −50 V transients |
| Quiescent Current | 2–10 mA at light load; rises to 10–20 mA at full 400 mA load when VIN ≥ VOUT + 5 V |
| Output Capacitor ESR | Stable with 10 µF capacitor having ESR from 10 mΩ to 3 Ω - supports ceramic, tantalum, and aluminum electrolytic types |
| Thermal Range | Specified for −40°C to +85°C junction temperature (SOT-223 package rating) |
Pinout & Package
SOT-223 (DCY) package: 4-pin surface-mount with exposed thermal tab (internally connected to GND), 6.50 mm × 3.5 mm body size. Requires PCB copper pour under tab for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated input supply | Accepts 11 V to 26 V DC; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 2 (GND) | Ground reference | Common return for input, output, and internal circuitry; electrically tied to thermal tab |
| 3 (OUTPUT) | Regulated 10 V output | Requires ≥10 µF output capacitor with ESR ≤3 Ω placed adjacent to pin for stability |
| 4 (TAB) | Thermal and ground connection | Exposed copper pad; must be soldered to ≥1 cm² PCB copper area for thermal conduction - not electrically isolated |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Survives −30 V DC input without damage or latch-up - eliminates need for external series diode in automotive battery lines |
| 60-V transient immunity | Withstands 60-V/100-ms load-dump pulses per ISO 7637-2 without shutdown or parameter shift |
| Wide ESR capacitor compatibility | Stable with output capacitors having ESR from 10 mΩ to 3 Ω - enables low-cost aluminum electrolytics and compact ceramics |
| Thermal shutdown with hysteresis | Shuts down above 150°C junction temperature and resumes only after cooling by ≥15°C - prevents thermal runaway during sustained overload |
| Low-noise regulation | 300 µVrms output noise (10 Hz–100 kHz) supports analog sensors and RF subsystems without additional filtering |
Applications
| Engine Control Unit (ECU) Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and analog sensor circuitry in engine bay environments subject to −40°C cold cranking and 125°C under-hood ambient spikes. IC Role / Device Role / Timing Role: Primary 10 V LDO supplying critical logic and analog rails; maintains regulation during battery voltage sag to 9 V (VOUT + 1 V). Use Value: Eliminates need for external reverse-polarity diode and transient suppressors - reduces BOM count and PCB area while meeting ISO 16750-2 load-dump requirements. | Use Scenario: Provides stable 10 V bias for isolated analog input channels and digital I/O drivers in factory automation controllers. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24 V industrial bus to 10 V for precision ADC references and op-amp supplies. Use Value: Tolerates wide input variation (11–26 V) and sustains operation during brownouts - ensures uninterrupted data acquisition during line disturbances. |
| Automotive Body Control Module (BCM) | Telematics GPS/Cellular Power |
Use Scenario: Supplies 10 V to door lock actuators, LED lighting drivers, and LIN transceivers in vehicle body electronics. IC Role / Device Role / Timing Role: Robust local regulator handling reverse-battery installation errors and jump-start surges up to 60 V. Use Value: Built-in −30 V reverse-DC and −50 V transient protection prevent field returns due to service technician wiring mistakes. | Use Scenario: Powers GNSS receiver and LTE modem baseband ICs requiring clean 10 V supply in connected car infotainment systems. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO delivering regulated 10 V from noisy 12 V vehicle battery rail. Use Value: 300 µVrms noise and 60 dB PSRR at 1 kHz minimize clock jitter and RF desense - improves GPS acquisition time and cellular handover reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2937ET-10/NOPB | TO-220 package; rated for −40°C to 125°C; 500 mA max; higher RθJA (77.9°C/W) | Used where higher ambient temperature (>85°C) or higher current (>400 mA) is required | Select when thermal design allows vertical heatsink mounting and full automotive temp range is needed |
| TPS7A4701RGWR | 200 mA, 10 V fixed, 25 µVrms noise, 1.1 V dropout at 150 mA, WQFN-20 package | Ultra-low-noise, precision alternative for sensitive analog circuits - not drop-in compatible | Choose only when noise <50 µVrms and tighter initial accuracy (<1%) are mandatory; requires PCB redesign |
Compared with LM2937IMPX-10, the LM2937ET-10 offers extended temperature capability and higher current but demands mechanical heatsinking, while the TPS7A4701RGWR delivers superior noise and accuracy at lower current and requires layout changes - neither is pin-compatible, and both serve distinct design priorities.
Availability
LM2937IMPX-10 is available at Aetrix Electronics and suitable for automotive ECU power, industrial PLC I/O modules, and telematics subsystems requiring stable component supply with long lifecycle assurance and AEC-Q200-aligned robustness.
Supply support for LM2937IMPX-10 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and communications markets.
The LM2937 product line was developed specifically for harsh-environment automotive and industrial power regulation, emphasizing fault resilience, wide-input operation, and simplified system-level protection.
FAQ
What is the maximum continuous input voltage for LM2937IMPX-10?
The LM2937IMPX-10 has a maximum continuous operational input voltage of 26 V DC. While it withstands 60-V/100-ms transients per ISO 7637-2, sustained operation above 26 V risks exceeding absolute maximum ratings and may trigger overvoltage shutdown or permanent damage. Always ensure steady-state VIN remains ≤26 V.
Does LM2937IMPX-10 require an input capacitor?
Yes, the LM2937IMPX-10 requires a minimum 0.1 µF ceramic input capacitor placed close to the INPUT and GND pins. This capacitor reduces high-frequency noise and improves transient response during load steps. TI recommends X7R or C0G dielectrics with low ESL for optimal performance in automotive environments.
Can LM2937IMPX-10 be used without a heatsink in a SOT-223 footprint?
Yes - the LM2937IMPX-10 in SOT-223 (DCY) package is rated for operation up to 85°C junction temperature without external heatsinking, provided the PCB includes ≥1 cm² copper pour under the thermal tab and ambient temperature stays ≤70°C at full 400 mA load. Thermal calculations using RθJA = 58.3°C/W confirm feasibility in typical industrial layouts.
What output capacitor types are validated for LM2937IMPX-10 stability?
The LM2937IMPX-10 is validated for stability with 10 µF output capacitors having ESR between 10 mΩ and 3 Ω. Confirmed types include aluminum electrolytic (with parallel tantalum for low-temp ESR control), solid tantalum, and multilayer ceramic (MLCC) - all tested per Figure 16 in SNVS100F. Avoid ultra-low-ESR MLCCs below 10 mΩ unless compensated per TI's design guidelines.
Is LM2937IMPX-10 compliant with automotive qualification standards?
The LM2937IMPX-10 is not AEC-Q200 qualified as a standalone component, but it meets key automotive stress requirements including −40°C to +85°C operation, 60-V load-dump immunity, −30 V reverse-battery survival, and thermal shutdown - making it widely deployed in non-safety-critical automotive modules such as body control and infotainment. For ASIL-B/C systems, consult TI's qualification documentation and perform system-level validation.
LM2937IMPX-10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 10V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- 20 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-4
LM2937IMPX-10 FAQ
1.How can I place an order for LM2937IMPX-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2937IMPX-10 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2937IMPX-10 reliable?
The price and inventory of LM2937IMPX-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2937IMPX-10 is usually 5 days.
3.What payment methods are accepted for LM2937IMPX-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2937IMPX-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2937IMPX-10?
LM2937IMPX-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2937IMPX-10 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2937IMPX-10?
For technical support, including LM2937IMPX-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2937IMPX-10 requirements.
6.How does Aetrix verify that LM2937IMPX-10 is sourced from the original manufacturer or authorized distributors?
All LM2937IMPX-10 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2937IMPX-10 meets industry standards.
7.What is the process for return or replacement of LM2937IMPX-10?
All LM2937IMPX-10 units undergo pre-shipment inspection (PSI). If there is an issue with LM2937IMPX-10, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2937IMPX-10 part is unused and in its original packaging.
Return procedure for LM2937IMPX-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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