My Inquiry
My Account
Texas Instruments LM2937ET-2.5
- Part No.:
- LM2937ET-2.5
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-3
- Datasheet:
-
LM2937ET-2.5.pdf
- Description:
- IC REG LINEAR 2.5V 500MA TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,745
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2937ET-2.5 from Texas Instruments is a 2.5 V fixed-output, 500-mA low-dropout linear regulator in TO-220 package, using a PNP pass transistor to achieve 0.5 V typical dropout at full load, with reverse battery protection and 60-V transient immunity-designed for automotive power rails and industrial point-of-load regulation.
For engineers reviewing the LM2937ET-2.5 datasheet, LM2937ET-2.5 pinout, LM2937ET-2.5 application, or LM2937ET-2.5 equivalent, key selection criteria include guaranteed 5% output tolerance over −40°C to 125°C, wide 0.01–3 Ω output capacitor ESR stability range, thermal shutdown and short-circuit protection, and compatibility with low-ESR ceramic or tantalum capacitors.
Technical Context
The LM2937ET-2.5 employs a PNP-based LDO architecture with internal bandgap reference and current-limiting circuitry, enabling stable regulation with minimal input–output differential. Its thermal shutdown activates at ~150°C junction temperature, and overvoltage shutdown disables output above ~32 V input.
It features mirror-image insertion protection and reverse-battery tolerance down to −30 V DC, making it suitable for harsh automotive environments. The device operates without enable or UVLO functions-output begins tracking input once VIN exceeds VOUT + 1 V, with optimal dynamic performance when VIN ≥ VOUT + 2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±5% (guaranteed across −40°C to 125°C, full load) |
| Max Output Current | 500 mA (TO-220 package; requires heatsinking above ~2 W dissipation) |
| Dropout Voltage | 0.5 V typical at 500 mA; ≤1 V max over full temperature and load range |
| Input Voltage Range | 2.5 V + 1 V (min) to 26 V (max continuous); withstands 60-V/100-ms transients |
| Quiescent Current | 10 mA typical at full 500-mA load and VIN ≥ VOUT + 3 V |
| Output Capacitor ESR | Stable with 0.01 Ω to 3 Ω-supports ceramic, tantalum, and aluminum electrolytic types |
| Protection Features | Internal thermal shutdown, short-circuit current limit (~0.6–1 A), reverse-battery (−30 V), and mirror-image insertion |
Pinout & Package
LM2937ET-2.5 is housed in a 3-pin TO-220 (NDE) package with integrated heat tab electrically connected to GND. The tab must be soldered to a large copper area for thermal management but must not be biased to any potential other than GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: INPUT | Unregulated input supply | Accepts 3.5 V to 26 V DC; clamped to 60 V transient; reverse-battery tolerant to −30 V |
| 2: GND | Ground reference and thermal path | Common return for input/output; tab internally tied to this pin-must connect tab to PCB ground plane |
| 3: OUTPUT | Regulated 2.5 V output | Requires ≥10 µF output capacitor with ESR ≤3 Ω; output impedance <100 mΩ at 10 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 0.5 V typical dropout at 500 mA enables use in 3.3 V–5 V input systems powering 2.5 V logic rails |
| Reverse Battery Protection | Withstands −30 V DC input without damage-eliminates need for external series diode in automotive battery lines |
| Transient Immunity | 60-V/100-ms load dump survival per ISO 7637-2-critical for engine control unit (ECU) and body electronics |
| Capacitor Flexibility | Stable with ESR from 10 mΩ to 3 Ω-allows cost-effective ceramic or mixed-technology output filtering |
| High-Temperature Operation | Specified from −40°C to +125°C junction-supports under-hood automotive and industrial control applications |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering microcontroller core voltage and CAN transceiver bias in engine bay environments subject to load dump and reverse battery events. IC Role / Device Role / Timing Role: Primary 2.5 V LDO supplying MCU core and interface peripherals with high transient immunity and thermal robustness. Use Value: Eliminates external protection diodes and reduces BOM count while maintaining regulation during 60-V/100-ms transients and −30 V reverse connections. |
Use Scenario: Local regulation for analog sensor signal conditioning circuits in programmable logic controller backplanes operating at 85°C ambient. IC Role / Device Role / Timing Role: Point-of-load regulator delivering clean 2.5 V reference to precision ADCs and op-amps in noisy industrial settings. Use Value: Stable output with ≤50 mV load regulation ensures <0.2% ADC reference error across 5–500 mA load swing. |
| Automotive Body Control Module (BCM) | Point-of-Load for FPGA I/O Banks |
Use Scenario: Supplying door module microcontrollers and LIN transceivers where space constraints favor TO-220 with direct heatsink mounting. IC Role / Device Role / Timing Role: Fixed 2.5 V regulator with integrated thermal shutdown and short-circuit protection for distributed body electronics. Use Value: Self-protecting operation prevents latch-up during wiring faults; 125°C rating allows placement near heat-generating components. |
Use Scenario: Providing dedicated 2.5 V rail to FPGA I/O banks requiring low-noise, high-current regulation with fast transient response. IC Role / Device Role / Timing Role: Low-dropout post-regulator stabilizing switched-mode supply output for noise-sensitive digital interfaces. Use Value: 150 μVrms output noise (typ.) and <10 μs load transient recovery preserve signal integrity on high-speed I/O lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2937MP-2.5 | SOT-223 package (4-pin), rated for −40°C to +85°C junction; 400 mA max output; higher RθJA (58.3°C/W) | Surface-mount alternative for space-constrained PCBs; lower thermal capability limits power density | Select when board area is critical and ambient temperature stays below 70°C with adequate copper pour |
| TPS7A4700RGWR | 2.5 V adjustable LDO; 1-A output; 31-μVrms noise; 26-V max input; no reverse-battery protection | Ultra-low-noise replacement for precision analog rails; lacks automotive-grade fault protection | Choose only for noise-sensitive applications where reverse-battery and load-dump immunity are handled externally |
Compared with LM2937ET-2.5, LM2937MP-2.5 trades thermal performance and current capability for SMT assembly, while TPS7A4700RGWR offers superior noise and current but requires external protection circuitry for automotive use-making LM2937ET-2.5 uniquely balanced for ruggedized 2.5 V point-of-load regulation.
Availability
LM2937ET-2.5 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, body control modules, and FPGA I/O power domains requiring stable component supply across extended temperature and transient stress conditions.
Supply support for LM2937ET-2.5 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 leader specializing in analog, embedded processing, and power management ICs, with deep expertise in automotive-grade reliability and industrial system solutions.
The LM2937 product line delivers rugged, feature-rich LDO regulators designed specifically for automotive and industrial applications demanding reverse-battery tolerance, high transient immunity, and extended temperature operation.
FAQ
What is the minimum input voltage required for LM2937ET-2.5 to regulate at 2.5 V?
The LM2937ET-2.5 requires a minimum input voltage of VOUT + 1 V = 3.5 V to maintain regulation. Below this threshold, the output tracks the input in dropout mode. For stable operation with good line transient response, TI recommends VIN ≥ VOUT + 2 V (i.e., ≥4.5 V). The device does not include undervoltage lockout, so output remains active as long as VIN exceeds the dropout threshold.
Does LM2937ET-2.5 require an input capacitor?
While not strictly mandatory for stability, LM2937ET-2.5 benefits from a 0.1 μF ceramic input capacitor placed close to the INPUT and GND pins to suppress high-frequency noise and improve transient response. This capacitor is especially recommended when the regulator is located more than 3 inches from the main power supply filter capacitors, as stated in the TI application note for the LM2937 family.
Can LM2937ET-2.5 be used with ceramic output capacitors?
Yes, LM2937ET-2.5 is explicitly designed to be stable with ceramic output capacitors having ESR as low as 10 mΩ-unlike many older LDOs that require minimum ESR. Its internal compensation supports the full 0.01–3 Ω ESR range, enabling use of small, low-ESR X7R/X5R ceramics without risk of oscillation, provided capacitance is ≥10 μF over the full operating temperature range.
What thermal derating applies to LM2937ET-2.5 in TO-220 package?
LM2937ET-2.5 in TO-220 has RθJA = 77.9°C/W (free-air). At 25°C ambient and 500 mA load with 5 V input, power dissipation is ~1.25 W, yielding ~97°C junction rise-well within the 125°C max. Derating begins above ~70°C ambient; above 100°C ambient, maximum safe load drops below 200 mA unless a heatsink is added. Thermal shutdown activates at ~150°C junction.
Is LM2937ET-2.5 pin-compatible with other LM2937 variants?
Yes, all LM2937 variants-including LM2937ET-2.5, LM2937ET-5.0, and LM2937ET-12-share identical TO-220 (NDE) pinout: Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT. The tab is internally connected to Pin 2 (GND) across all versions. This allows drop-in replacement between output voltage options without PCB layout changes, provided thermal and input voltage requirements are met.
LM2937ET-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
LM2937ET-2.5 FAQ
1.How can I place an order for LM2937ET-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2937ET-2.5 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 LM2937ET-2.5 reliable?
The price and inventory of LM2937ET-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2937ET-2.5 is usually 5 days.
3.What payment methods are accepted for LM2937ET-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2937ET-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2937ET-2.5?
LM2937ET-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2937ET-2.5 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 LM2937ET-2.5?
For technical support, including LM2937ET-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2937ET-2.5 requirements.
6.How does Aetrix verify that LM2937ET-2.5 is sourced from the original manufacturer or authorized distributors?
All LM2937ET-2.5 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 LM2937ET-2.5 meets industry standards.
7.What is the process for return or replacement of LM2937ET-2.5?
All LM2937ET-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM2937ET-2.5, 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 LM2937ET-2.5 part is unused and in its original packaging.
Return procedure for LM2937ET-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2937ET-2.5 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
