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Texas Instruments LM57FEPWQ1
- Part No.:
- LM57FEPWQ1
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM57FEPWQ1.pdf
- Description:
- THERMOSTAT PROG OPEN COL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,638
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Product details
Overview
LM57FEPWQ1 from Texas Instruments is an AEC-Q100 Grade 0 automotive-qualified resistor-programmable temperature switch with dual digital outputs (TOVER active-high push-pull, TOVER active-low open-drain) and a class AB analog VTEMP output. It delivers ±2.3°C trip accuracy and ±1.3°C analog sensor accuracy across −50°C to +150°C, operating from 2.4V to 5.5V. Used in engine control units and battery management systems for overtemperature protection and real-time thermal monitoring.
For engineers reviewing the LM57FEPWQ1 datasheet, LM57FEPWQ1 pinout, LM57FEPWQ1 application, or LM57FEPWQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed hysteresis options (5°C), exact VTEMP gain coefficients (J2–J5), and direct alternative part comparisons for automotive thermal safety design.
Technical Context
The LM57FEPWQ1 integrates an internal DAC, analog temperature sensor, and comparator to generate programmable trip thresholds via two external 1% resistors on SENSE1/SENSE2. Its VTEMP output features four selectable negative temperature coefficient gains (−5.166, −7.752, −10.339, −12.924 mV/°C) mapped to distinct temperature ranges.
Digital outputs include TOVER (push-pull, active-high) and TOVER (open-drain, active-low), both asserting above TTRIP and de-asserting at TTRIP minus THYST. TRIP-TEST enables in-system functional verification by forcing outputs active and exposing VTRIP at VTEMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −50°C to +150°C (AEC-Q100 Grade 0 Standard) |
| Supply Voltage | 2.4 V to 5.5 V - supports wide automotive rail variation without regulation |
| Tripping Accuracy | ±2.3°C - includes contribution of 1% external resistors; no added error from resistor tolerance |
| VTEMP Accuracy | ±1.3°C - analog output usable for closed-loop thermal feedback without calibration |
| Hysteresis | 5°C - factory-set; prevents output oscillation during slow thermal transitions |
| Quiescent Current | 24–29 µA - minimizes self-heating (<0.02°C) in sealed enclosures |
| VTEMP Gain Options | J2 (−5.166 mV/°C), J3 (−7.752 mV/°C), J4 (−10.339 mV/°C), J5 (−12.924 mV/°C) - selected by RSENSE values |
Pinout & Package
Packaged in PW/TSSOP-8 (3.00 mm × 6.40 mm), the LM57FEPWQ1 uses a standard 8-pin surface-mount footprint compatible with automated assembly and high-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Power ground reference | Primary return path for analog and digital circuitry; must be low-impedance connection to system ground plane |
| SENSE1 / SENSE2 | Resistor divider inputs | Set trip point (TTRIP) and VTEMP gain simultaneously; ratio determines one of 256 possible thresholds |
| VDD | Positive supply input | Accepts unregulated automotive supply (2.4–5.5 V); internal LDO not required |
| TRIP TEST | Digital test enable input | Active-high signal that forces TOVER/TOVER active and routes VTRIP to VTEMP for production test verification |
| TOVER | Digital output (active-high) | Push-pull structure drives MCU interrupt or latch directly; no external pull-up needed |
| TOVER | Digital output (active-low) | Open-drain output requires external pull-up; interfaces safely with mixed-voltage logic domains |
| VTEMP | Analog temperature voltage output | Class AB buffered output; linear voltage proportional to die temperature with programmable NTC slope |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable trip point | 256 discrete thresholds from −50°C to +150°C using only two 1% external resistors - eliminates need for trimming or EEPROM |
| Latching function via TRIP-TEST | Tying TOVER to TRIP-TEST creates hardware latch; cleared only by pulling TRIP-TEST low or power cycle - ensures fault persistence in safety-critical systems |
| Short-circuit protected outputs | Both TOVER and VTEMP survive sustained short-to-rail faults - critical for under-hood environments with wiring harness risks |
| In-system TRIP-TEST verification | Asserting TRIP-TEST confirms full signal chain functionality (comparator, DAC, output drivers) post-assembly - reduces end-of-line test complexity |
| Low self-heating | 24–29 µA quiescent current limits thermal offset to <0.02°C - preserves measurement integrity in thermally isolated modules |
Applications
| Engine Control Unit (ECU) Thermal Monitoring | Battery Management System (BMS) Overtemperature Protection |
|---|---|
Use Scenario: Real-time cylinder head or exhaust manifold temperature tracking in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Analog VTEMP feeds ADC for closed-loop fan control; TOVER triggers immediate engine derate when threshold exceeded. Use Value: ±1.3°C VTEMP accuracy enables precise thermal margining; 5°C hysteresis prevents relay chatter during transient thermal events. | Use Scenario: Cell-level overtemperature detection in 48V mild-hybrid battery packs. IC Role / Device Role / Timing Role: LM57FEPWQ1 monitors module temperature; TOVER asserts to isolate pack via contactor driver upon reaching 85°C. Use Value: Resistor programming allows field-adjustable trip points per cell group; AEC-Q100 Grade 0 ensures reliability at 150°C ambient. |
| Automotive Infotainment Processor Throttling | Electric Power Steering (EPS) Motor Driver Thermal Shutdown |
Use Scenario: Thermal supervision of SoC junction temperature in head-unit processors. IC Role / Device Role / Timing Role: VTEMP analog output sampled by host MCU; TOVER interrupts processor to initiate clock throttling before thermal shutdown. Use Value: Dual-output architecture enables both continuous monitoring (VTEMP) and fail-safe action (TOVER); TRIP-TEST validates function during boot. | Use Scenario: MOSFET junction temperature monitoring in EPS motor gate driver ICs. IC Role / Device Role / Timing Role: LM57FEPWQ1 mounted adjacent to power stage; TOVER disables PWM generation when driver die exceeds 145°C. Use Value: Open-drain TOVER safely interfaces with isolated gate driver logic; ±2.3°C trip accuracy ensures consistent shutdown across production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch and analog sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM57TEPWQ1 | Same package and accuracy specs, but factory-set 10°C hysteresis instead of 5°C | Suitable where wider thermal deadband is acceptable to reduce false trips in noisy thermal environments | Select LM57TEPWQ1 if system thermal transients exceed 5°C/min and require greater noise immunity |
| LM57FSPWQ1 | Extended temperature range (−50°C to +160°C) with 5°C hysteresis; same pinout and accuracy | Required for under-hood applications exceeding 150°C ambient, such as turbocharger housing mounts | Choose LM57FSPWQ1 only when operation beyond 150°C is mandatory; otherwise LM57FEPWQ1 offers optimal cost/performance |
Compared with LM57TEPWQ1 and LM57FSPWQ1, the LM57FEPWQ1 provides the tightest hysteresis (5°C) within the standard −50°C to +150°C automotive grade, making it ideal for precision thermal control loops where minimal trip/release overlap is critical.
Availability
LM57FEPWQ1 is available at Aetrix Electronics and suitable for automotive ECU thermal monitoring, battery management system overtemperature protection, and electric power steering motor driver shutdown requiring stable component supply across extended temperature ranges and AEC-Q100 compliance.
Supply support for LM57FEPWQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive-grade ICs and long-term product lifecycle commitment.
The LM57-Q1 product line delivers AEC-Q100 qualified temperature switches with integrated analog sensing for automotive safety-critical thermal management, enabling robust overtemperature response without microcontroller dependency.
FAQ
What is the maximum operating temperature for the LM57FEPWQ1?
The LM57FEPWQ1 is rated for operation from −50°C to +150°C, meeting AEC-Q100 Grade 0 Standard temperature requirements. This range is validated for continuous operation and supported by HTOL testing at 170°C for limited duration. The LM57FEPWQ1 must not be operated beyond +150°C ambient, as higher temperatures apply only to the LM57FSPWQ1 variant.
How does the LM57FEPWQ1 achieve ±2.3°C trip accuracy despite using external resistors?
The LM57FEPWQ1 achieves ±2.3°C trip accuracy because its internal DAC decodes resistance ratios at SENSE1/SENSE2 into 16 logic levels, then maps those levels to precise trip voltages. Since resistor tolerance affects only the logic level selection-not the DAC's output voltage-the 1% resistor tolerance contributes zero additional error to the final trip point accuracy specification.
Can the LM57FEPWQ1 be used without connecting the TRIP-TEST pin?
Yes, the LM57FEPWQ1 operates fully without TRIP-TEST connected-default behavior is normal temperature sensing and switching. However, leaving TRIP-TEST unconnected risks noise-induced false triggering; TI recommends tying TRIP-TEST to GND via a 100-kΩ resistor if unused. When actively used, TRIP-TEST enables in-system verification of LM57FEPWQ1 functionality post-assembly.
What are the VTEMP output drive capabilities of the LM57FEPWQ1?
The LM57FEPWQ1 VTEMP output is a class AB buffer capable of sourcing up to 240 µA or sinking up to 300 µA while maintaining specified accuracy. Load regulation remains within ±1 mV for sink currents ≤300 µA and source currents ≤240 µA. No series resistor is required, and capacitive loads up to 1100 pF are supported without instability.
Is the LM57FEPWQ1 pin-compatible with other devices in the LM57-Q1 family?
Yes, all LM57-Q1 variants-including LM57FEPWQ1, LM57TEPWQ1, LM57FSPWQ1, and LM57TSPWQ1-share identical PW/TSSOP-8 packaging, pinout, and electrical interface. Differences are limited to factory-set hysteresis (5°C vs. 10°C) and maximum operating temperature (150°C vs. 160°C), allowing drop-in replacement within the same grade and hysteresis requirement.
LM57FEPWQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- Programmable
- Accuracy:
- ±2.3°C
- Current - Output (Max):
- 5mA
- Output Type:
- Open Collector, Push-Pull
- Output:
- Active High, Active Low
- Output Function:
- OverTemp, /OverTemp
- Selectable Hysteresis:
- No
- Features:
- Selectable Trip Point, Trip Test
- Voltage - Supply:
- 2.4 V ~ 5.5 V
- Current - Supply:
- 24µA
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-TSSOP
LM57FEPWQ1 FAQ
1.How can I place an order for LM57FEPWQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM57FEPWQ1 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 LM57FEPWQ1 reliable?
The price and inventory of LM57FEPWQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM57FEPWQ1 is usually 5 days.
3.What payment methods are accepted for LM57FEPWQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM57FEPWQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM57FEPWQ1?
LM57FEPWQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM57FEPWQ1 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 LM57FEPWQ1?
For technical support, including LM57FEPWQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM57FEPWQ1 requirements.
6.How does Aetrix verify that LM57FEPWQ1 is sourced from the original manufacturer or authorized distributors?
All LM57FEPWQ1 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 LM57FEPWQ1 meets industry standards.
7.What is the process for return or replacement of LM57FEPWQ1?
All LM57FEPWQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM57FEPWQ1, 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 LM57FEPWQ1 part is unused and in its original packaging.
Return procedure for LM57FEPWQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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