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Texas Instruments LM57TSPWQ1
- Part No.:
- LM57TSPWQ1
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM57TSPWQ1.pdf
- Description:
- THERMOSTAT PROG ACT HI/LO 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
LM57TSPWQ1 from Texas Instruments is an AEC-Q100 Grade 0 Extended automotive temperature switch and analog sensor IC with resistor-programmable trip point, ±2.3°C trip accuracy (−40°C to +150°C), ±1.3°C VTEMP analog output accuracy, and 10°C hysteresis. It delivers dual digital outputs (push-pull TOVER and open-drain TOVER) plus a class AB analog VTEMP voltage proportional to die temperature, used for overtemperature protection in engine control units and battery management systems.
For engineers reviewing the LM57TSPWQ1 datasheet, LM57TSPWQ1 pinout, LM57TSPWQ1 application, or LM57TSPWQ1 equivalent, key selection criteria include its −50°C to +160°C operating range, resistor-settable trip point across 256 values, J2–J5 programmable NTC gain options, TRIP-TEST latching capability, and automotive-grade ESD robustness (HBM ±2 kV, CDM ±750 V).
Technical Context
The LM57TSPWQ1 integrates an internal DAC, analog temperature sensor, and comparator to generate both digital overtemperature alerts and a linear analog voltage output. Its trip point is set by two external 1% resistors connected to SENSE1/SENSE2, which decode into one of 16 logic levels driving the DAC - eliminating resistor tolerance contribution to threshold error.
VTEMP gain is automatically selected (J2 to J5) based on the programmed trip point, with slopes ranging from −5.166 mV/°C to −12.924 mV/°C. Built-in 10°C hysteresis prevents output oscillation during thermal transitions, and TRIP-TEST enables in-system functional verification by forcing outputs active and routing VTRIP to VTEMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature Range | −50°C to +160°C (Grade 0 Extended), with excursions up to +170°C validated for HTOL life testing |
| Tripping Accuracy | ±2.3°C from −40°C to +150°C; ±2.5°C at 150°C–160°C - enables precise thermal shutdown without calibration |
| VTEMP Analog Accuracy | ±1.3°C from −50°C to +150°C; ±1.5°C at 150°C–160°C - supports high-fidelity temperature monitoring via ADC |
| Hysteresis | 10°C (factory preset for LM57TSPWQ1) - ensures stable digital output release below TTRIP − 10°C |
| Supply Voltage | +2.4 V to +5.5 V - compatible with 3.3 V and 5 V automotive subsystems without level-shifting |
| Quiescent Current | 24–29 µA at TA = 150°C–160°C - 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) - matched to trip-point ranges for optimal signal swing |
Pinout & Package
TSSOP-8 (PW) package, 3.00 mm × 6.40 mm body size, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Primary return path for all internal circuits; must be low-impedance connection to system ground plane |
| SENSE1 (Pin 2) | Resistor network input | One terminal of external RSENSE divider; sets trip point and VTEMP gain via decoded logic level |
| SENSE2 (Pin 3) | Resistor network input | Second terminal of external RSENSE divider; completes trip-point programming with SENSE1 |
| VDD (Pin 4) | Positive supply input | Accepts 2.4–5.5 V; powers internal regulator, DAC, sensor, and output drivers |
| TRIP TEST (Pin 5) | Digital test control input | Active-high; forces TOVER/TOVER active and routes VTRIP to VTEMP for production test and fault verification |
| TOVER (Pin 6) | Active-low overtemp output | Open-drain; requires external pullup; asserts when TDI ≥ TTRIP, de-asserts at TDI ≤ (TTRIP − 10°C) |
| TOVER (Pin 7) | Active-high overtemp output | Push-pull; drives high/low directly; same trip/release thresholds as TOVER |
| VTEMP (Pin 8) | Analog temperature voltage output | Class AB output; provides VTS or VTRIP depending on TRIP TEST state; supports ≤300 µA sink/source load |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable trip point | 256 discrete trip values from −50°C to +160°C using only two 1% external resistors - eliminates need for trimming or EEPROM |
| TRIP-TEST latching function | Driving TRIP TEST high latches TOVER/TOVER outputs until cleared by pulling TRIP TEST low - enables fail-safe alarm persistence |
| Short-circuit protected outputs | Both TOVER and TOVER outputs withstand indefinite short-to-ground or short-to-VDD - enhances reliability in harsh wiring environments |
| Programmable VTEMP gain | Four factory-matched NTC slopes (J2–J5) automatically selected per trip point - maximizes ADC resolution across full temperature range |
| In-system testability | VTRIP appears at VTEMP when TRIP TEST = 1, allowing microcontroller to verify trip threshold without thermal stimulus - reduces end-of-line test time |
Applications
| Engine Control Unit (ECU) Thermal Monitoring | Battery Management System (BMS) Cell Pack Protection |
|---|---|
Use Scenario: Real-time die temperature monitoring of power MOSFETs and gate drivers in engine control modules under high ambient conditions. IC Role / Device Role / Timing Role: Dual-output thermal protector and analog sensor providing both immediate shutdown signaling (TOVER/TOVER) and continuous temperature telemetry (VTEMP). Use Value: Enables compliance with ISO 26262 ASIL-B thermal safety requirements through deterministic 10°C hysteresis and ±2.3°C trip accuracy up to +160°C. | Use Scenario: Overtemperature detection for lithium-ion battery cell packs in EV traction inverters, where localized hot spots exceed ambient limits. IC Role / Device Role / Timing Role: Resistor-configured switch triggering contactor disconnect while feeding analog temperature data to BMS MCU for predictive thermal modeling. Use Value: Eliminates calibration overhead with 1% resistor-based trip setting and supports wide-range analog readout (−50°C to +160°C) for accurate pack-level thermal profiling. |
| Automotive Transmission Control Module | Avionics Power Supply Monitoring |
Use Scenario: Monitoring hydraulic oil temperature and power stage junction temperature in automatic transmission control units exposed to under-hood heat soak. IC Role / Device Role / Timing Role: Precision analog sensor (VTEMP) and fail-safe digital switch (TOVER/TOVER) integrated on same die for correlated thermal sensing. Use Value: Reduces component count vs. discrete sensor+comparator solutions while maintaining AEC-Q100 Grade 0 Extended qualification (−50°C to +160°C). | Use Scenario: Thermal supervision of DC-DC converters and FPGAs in airborne electronics where extended temperature operation and latchable alarms are mandatory. IC Role / Device Role / Timing Role: Latch-capable overtemperature detector with TRIP-TEST verification, deployed in redundant power rails requiring deterministic fault reporting. Use Value: TRIP-TEST pin allows in-flight self-test without thermal cycling; open-drain TOVER supports wired-OR fault bus architectures common in avionics. |
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 |
|---|---|---|---|
| LM57FSPWQ1 | Same TSSOP-8 package and Grade 0 Extended rating, but 5°C hysteresis and J2–J5 gain mapping aligned to lower trip ranges | Preferred where tighter hysteresis is required to prevent nuisance tripping near thermal limits | Select LM57FSPWQ1 when system thermal margin is narrow and 5°C hysteresis improves stability |
| LM57TPWR | Commercial-grade (non-AEC-Q100) TSSOP-8 variant with identical 10°C hysteresis and ±2.3°C trip accuracy, but rated only to +150°C | Suitable for non-automotive industrial applications where extended temperature range is not required | Choose LM57TPWR for cost-sensitive non-automotive designs needing same functionality without automotive qualification |
Compared with LM57FSPWQ1 and LM57TPWR, the LM57TSPWQ1 uniquely combines AEC-Q100 Grade 0 Extended qualification (−50°C to +160°C), 10°C hysteresis for robust thermal margin, and resistor-programmable trip points - making it the only option qualified for high-reliability automotive powertrain and battery systems demanding operation beyond +150°C.
Availability
LM57TSPWQ1 is available at Aetrix Electronics and suitable for automotive powertrain control, battery management systems, and avionics thermal supervision requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM57TSPWQ1 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, industrial, and power management ICs.
The LM57-Q1 product line delivers AEC-Q100-qualified temperature switches and analog sensors designed specifically for automotive thermal protection and monitoring in powertrain, battery, and chassis control systems.
FAQ
What is the maximum operating temperature supported by the LM57TSPWQ1?
The LM57TSPWQ1 supports an operating temperature range of −50°C to +160°C (AEC-Q100 Grade 0 Extended), with high-temperature operational life testing validated up to +170°C for 10 hours. This exceeds standard automotive Grade 0 limits and enables deployment in proximity to high-power engine and inverter components where ambient temperatures exceed +150°C.
How does the LM57TSPWQ1 achieve ±2.3°C trip accuracy without calibration?
The LM57TSPWQ1 achieves ±2.3°C trip accuracy from −40°C to +150°C by using two external 1% resistors to select one of 256 trip points via an internal DAC and logic decoder. Resistor tolerance contributes zero error because the SENSE pins interpret resistance ratios as discrete logic levels - not absolute values - ensuring accuracy is determined solely by the IC's internal reference and comparator.
Can the LM57TSPWQ1 be used without external resistors?
No, the LM57TSPWQ1 requires two external 1% resistors connected between SENSE1, SENSE2, and GND/VDD to define the trip temperature and corresponding VTEMP gain. Without these resistors, the SENSE inputs float, preventing valid trip-point selection and disabling proper VTEMP slope configuration - the device will not assert TOVER/TOVER or produce a calibrated analog output.
What is the purpose of the TRIP-TEST pin on the LM57TSPWQ1?
The TRIP-TEST pin on the LM57TSPWQ1 is an active-high digital input that forces both TOVER and TOVER outputs into their active states and routes the trip-reference voltage VTRIP to the VTEMP pin. This enables in-system functional verification during manufacturing or field diagnostics - confirming comparator response and output driver integrity without requiring thermal stimulus.
Does the LM57TSPWQ1 require an external pull-up resistor on TOVER?
Yes, TOVER is an open-drain, active-low output and requires an external pull-up resistor to VDD (typically 4.7 kΩ to 10 kΩ) to ensure proper logic-high level when de-asserted. TOVER is push-pull and does not require external biasing. The pull-up value must be selected to meet rise-time and current-sink requirements specified in the datasheet (≤1.2 mA sink capability).
LM57TSPWQ1 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 Drain, 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:
- 26µA
- Operating Temperature:
- -50°C ~ 160°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-TSSOP
LM57TSPWQ1 FAQ
1.How can I place an order for LM57TSPWQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM57TSPWQ1 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 LM57TSPWQ1 reliable?
The price and inventory of LM57TSPWQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM57TSPWQ1 is usually 5 days.
3.What payment methods are accepted for LM57TSPWQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM57TSPWQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM57TSPWQ1?
LM57TSPWQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM57TSPWQ1 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 LM57TSPWQ1?
For technical support, including LM57TSPWQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM57TSPWQ1 requirements.
6.How does Aetrix verify that LM57TSPWQ1 is sourced from the original manufacturer or authorized distributors?
All LM57TSPWQ1 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 LM57TSPWQ1 meets industry standards.
7.What is the process for return or replacement of LM57TSPWQ1?
All LM57TSPWQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM57TSPWQ1, 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 LM57TSPWQ1 part is unused and in its original packaging.
Return procedure for LM57TSPWQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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