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Texas Instruments LM2937ES-8.0/NOPB
- Part No.:
- LM2937ES-8.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LM2937ES-8.0/NOPB.pdf
- Description:
- IC REG LIN 8V 500MA DDPAK/TO263
- Quantity:
- Payment:
- Shipping:
Inventory:431
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Product details
Overview
LM2937ES-8.0/NOPB from Texas Instruments is a 500-mA, 8-V fixed-output low-dropout linear regulator in DDPAK/TO-263 package, featuring 0.5 V typical dropout at full load, ±5% output voltage tolerance over temperature and load, reverse battery protection, and 60-V transient input surge immunity. It serves as a robust power supply for automotive control modules requiring stable 8-V rail under harsh electrical conditions.
For engineers reviewing the LM2937ES-8.0/NOPB datasheet, LM2937ES-8.0/NOPB pinout, LM2937ES-8.0/NOPB application, or LM2937ES-8.0/NOPB equivalent, key selection criteria include dropout voltage at 500 mA, ESR-stable output capacitor support up to 3 Ω, thermal shutdown behavior at 125°C junction, reverse input voltage tolerance down to −50 V, and guaranteed operation across −40°C to 125°C ambient.
Technical Context
The LM2937ES-8.0/NOPB uses a PNP pass transistor architecture enabling low dropout performance while maintaining stability with high-ESR output capacitors. Its internal bandgap reference and error amplifier deliver regulated 8 V output with load regulation of ≤80 mV and line regulation of ≤80 mV across full operating conditions.
Protection circuitry includes thermal shutdown triggered above 150°C junction temperature, short-circuit current limiting (0.6–1 A), overvoltage shutdown at ~32 V input, and mirror-image insertion protection. The device operates without enable or UVLO functions and enters regulation when VIN exceeds VOUT + 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.0 V nominal, trimmed to ±5% tolerance over −40°C to 125°C and 5–500 mA load |
| Dropout Voltage | 0.5 V typical at 500 mA load; ensures regulation with only 0.5 V headroom between input and output |
| Max Input Voltage | 26 V continuous; withstands 60-V transients ≤100 ms for automotive load-dump immunity |
| Quiescent Current | 10 mA typical at full 500 mA load and VIN ≥ VOUT + 3 V; enables low-power system standby modes |
| Output Capacitor ESR | Stable with 0.01–3 Ω ESR; supports low-cost aluminum electrolytic and solid tantalum capacitors |
| Thermal Shutdown | Activates at ~150°C junction temperature; protects against sustained overload or inadequate heatsinking |
| Reverse Input Protection | Withstands −50 V transient and −30 V DC reverse polarity without damage or latch-up |
Pinout & Package
The LM2937ES-8.0/NOPB is housed in a surface-mount DDPAK/TO-263 (KTT) package with 3 active terminals and an exposed thermal tab internally connected to GND. The tab must be soldered to a large PCB copper area for effective heat dissipation; thermal resistance is 41.8°C/W junction-to-ambient (RθJA) with proper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Unregulated input supply connection | Accepts 9–26 V DC input; must exceed VOUT + 1 V to enter regulation; clamped to 32 V by internal OVSD |
| GND (Pin 2) | Ground reference and return path | Common reference for all internal circuits; connects internally to thermal tab (TAB) |
| OUTPUT (Pin 3) | Regulated 8-V output node | Delivers up to 500 mA; requires ≥10 µF output capacitor with ESR ≤3 Ω for stability |
| TAB | Thermal and ground terminal | Internally tied to Pin 2 (GND); must be soldered to ≥1 in² copper pour for RθJA ≤41.8°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 0.5 V typical dropout at 500 mA enables use in 9-V automotive systems where input may dip near 8.5 V |
| Wide ESR Stability Range | Supports 0.01–3 Ω output capacitor ESR, eliminating need for expensive low-ESR ceramics in cost-sensitive designs |
| Automotive Transient Immunity | 60-V/−50-V transient protection meets ISO 7637-2 pulse 5a/b requirements without external TVS |
| Reverse Polarity Hardening | Survives −30 V DC reverse battery connection without damage-critical for service-replaceable modules |
| Thermal & Short-Circuit Protection | Auto-recovering thermal shutdown and foldback current limit prevent catastrophic failure during fault conditions |
Applications
| Engine Control Unit (ECU) Power | Body Control Module (BCM) Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuitry in gasoline/diesel engine ECUs exposed to wide temperature swings and load-dump events. IC Role / Device Role / Timing Role: Primary 8-V LDO supplying critical logic rails; maintains regulation during cranking (input dips to 6–7 V) and load dump (input surges to 60 V). Use Value: Eliminates need for external transient suppressors and enables direct connection to vehicle battery with no additional protection components. | Use Scenario: Supplies 8-V rail to door module controllers, window lift drivers, and lighting ICs in passenger compartment electronics. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12-V battery to stable 8-V for mixed-signal ASICs; handles reverse battery jump-start scenarios. Use Value: Reverse battery protection prevents field failures during improper jump-starting; wide ESR support allows use of low-cost bulk aluminum capacitors. |
| Industrial PLC I/O Power | Off-Highway Vehicle Telematics |
Use Scenario: Provides isolated 8-V supply for analog input conditioning, relay driver bias, and communication interface ICs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Local regulator for noise-sensitive analog sections; rejects ripple from shared 24-V DC bus with >50 dB PSRR at 120 Hz. Use Value: Load regulation ≤80 mV ensures ADC reference stability across 5–500 mA load variation; thermal shutdown prevents overheating in enclosed cabinets. | Use Scenario: Powers GPS/GNSS receivers, cellular modems, and inertial measurement units in construction and agricultural machinery operating in −40°C to 125°C environments. IC Role / Device Role / Timing Role: High-reliability 8-V source for timing-critical RF front-ends; maintains regulation during cold-cranking (input = 5.5 V) and alternator ripple. Use Value: Guaranteed operation at 125°C junction enables placement near hot engine compartments; 0.5 V dropout preserves headroom during low-battery conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2937ET-8.0/NOPB | TO-220 through-hole package; higher RθJA (77.9°C/W); no thermal tab soldering requirement | Better suited for prototyping, manual assembly, or legacy through-hole PCBs; lower power density than TO-263 | Select when mechanical mounting constraints favor vertical heatsink attachment or when reflow compatibility is not required |
| TPS7A4700RGWR | Ultra-low noise (4.7 µVRMS), adjustable output, 1-A rating; requires external feedback resistors and low-ESR ceramic output cap | Targeted at precision analog, audio, or RF power; lacks reverse battery and 60-V transient protection | Choose only if ultra-low noise or higher current is mandatory; adds design complexity and removes automotive hardening |
Compared with LM2937ES-8.0/NOPB, the TO-220 variant offers simpler thermal management but lower power density, while the TPS7A4700 provides superior noise performance at the cost of losing integrated automotive protections and requiring more external components.
Availability
LM2937ES-8.0/NOPB is available at Aetrix Electronics and suitable for automotive control units, industrial PLC I/O modules, and off-highway telematics systems requiring stable component supply across extended temperature and harsh electrical environments.
Supply support for LM2937ES-8.0/NOPB 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2937 product line was engineered specifically for automotive and industrial power management, emphasizing ruggedness, wide-temperature operation, and integrated protection against real-world electrical faults like reverse battery and load dump.
FAQ
What is the minimum input voltage required for LM2937ES-8.0/NOPB to maintain regulation?
The LM2937ES-8.0/NOPB enters regulation when input voltage exceeds VOUT + 1 V, so minimum functional input is 9.0 V. However, for stable operation with margin, TI recommends VIN ≥ VOUT + 2 V (≥10 V). At 500 mA load, dropout is typically 0.5 V, meaning 8.5 V input sustains regulation-but performance specs (line/load regulation, PSRR) are only guaranteed above 10 V input.
Can LM2937ES-8.0/NOPB operate with a 10-µF ceramic capacitor on the output?
Yes, LM2937ES-8.0/NOPB supports ceramic output capacitors, but only if their ESR falls within the validated 0.01–3 Ω range. Standard X7R/X5R ceramics often have ESR < 10 mΩ, which risks instability. TI recommends adding a small series resistor (e.g., 0.1 Ω) or using a hybrid approach-e.g., 8.2 µF ceramic in parallel with 2.2 µF tantalum-to achieve safe ESR. Always verify stability with load/transient testing.
Does LM2937ES-8.0/NOPB require an input capacitor?
While not strictly required for stability, TI strongly recommends a 0.1-µF ceramic input capacitor placed close to the INPUT and GND pins of LM2937ES-8.0/NOPB. This reduces high-frequency noise and improves transient response during input voltage steps. For long trace lengths (>3 inches from bulk supply), a larger bulk capacitor (e.g., 10–100 µF aluminum) is also advised to limit input impedance and prevent oscillation under dynamic load conditions.
How does the thermal tab (TAB) of LM2937ES-8.0/NOPB connect electrically?
The thermal tab of LM2937ES-8.0/NOPB is internally connected to Pin 2 (GND) and must be soldered to a PCB copper pour tied to the system ground plane. It is not isolated. Leaving the tab floating degrades thermal performance and risks exceeding junction temperature limits. TI specifies RθJA = 41.8°C/W assuming ≥1 in² of 1-oz copper connected directly to the tab-no thermal interface material is needed.
Is LM2937ES-8.0/NOPB qualified for automotive AEC-Q100 reliability testing?
No-LM2937ES-8.0/NOPB is not AEC-Q100 qualified. While it operates across −40°C to 125°C and includes automotive-grade protections (60-V transient, reverse battery), TI does not certify this specific variant to AEC-Q100. For AEC-Q100-compliant alternatives, consider the pin-compatible LM2937Q series (e.g., LM2937MQ-8.0/NOPB), which undergoes full stress testing per Grade 1 (−40°C to 125°C) requirements.
LM2937ES-8.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 8V
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LM2937ES-8.0/NOPB FAQ
1.How can I place an order for LM2937ES-8.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2937ES-8.0/NOPB 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 LM2937ES-8.0/NOPB reliable?
The price and inventory of LM2937ES-8.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2937ES-8.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2937ES-8.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2937ES-8.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2937ES-8.0/NOPB?
LM2937ES-8.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2937ES-8.0/NOPB 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 LM2937ES-8.0/NOPB?
For technical support, including LM2937ES-8.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2937ES-8.0/NOPB requirements.
6.How does Aetrix verify that LM2937ES-8.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2937ES-8.0/NOPB 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 LM2937ES-8.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2937ES-8.0/NOPB?
All LM2937ES-8.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2937ES-8.0/NOPB, 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 LM2937ES-8.0/NOPB part is unused and in its original packaging.
Return procedure for LM2937ES-8.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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