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Texas Instruments LM57FSPWRQ1
- Part No.:
- LM57FSPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- -
- Datasheet:
-
LM57FSPWRQ1.pdf
- Description:
- LM57-Q1 - AUTOMOTIVE GRADE 0 C T
- Quantity:
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Inventory:12,000
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Product details
Overview
LM57FSPWRQ1 from Texas Instruments is an AEC-Q100 Grade 0 Extended automotive temperature switch and analog sensor IC with resistor-programmable trip point (−50°C to +160°C), ±2.3°C trip accuracy, ±1.3°C VTEMP analog output accuracy, 5°C hysteresis, and dual digital outputs (push-pull TOVER, open-drain TOVER) for overtemperature protection in engine control units.
For engineers reviewing the LM57FSPWRQ1 datasheet, LM57FSPWRQ1 pinout, LM57FSPWRQ1 application, or LM57FSPWRQ1 equivalent, this page delivers verified specifications, TSSOP-8 package details, resistor-programmable thermal threshold configuration, and automotive-grade reliability data required for safety-critical thermal monitoring designs.
Technical Context
The LM57FSPWRQ1 integrates a precision analog temperature sensor with class AB VTEMP output, internal DAC-based reference generation, and dual-comparator architecture. Its trip point is set by two external 1% resistors connected to SENSE1/SENSE2, enabling 256 discrete thresholds without resistor tolerance error contribution.
It features four programmable VTEMP gain slopes (J2 to J5, −5.166 to −12.924 mV/°C), each mapped to specific temperature ranges, with full-range analog validity and built-in 5°C thermal hysteresis to prevent output oscillation during threshold transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −50°C to +160°C (Grade 0 Extended), with 170°C excursions validated per AEC-Q100 HTOL |
| VTEMP Accuracy | ±1.3°C from −50°C to +150°C; ±1.5°C at +150°C to +160°C - enables high-fidelity thermal feedback for closed-loop control |
| Tripoint Accuracy | ±2.3°C across full range - ensures reliable overtemperature shutdown in safety-critical automotive systems |
| Hysteresis | 5°C factory-set - prevents chatter during thermal transients near trip point |
| Supply Voltage | +2.4 V to +5.5 V - compatible with 3.3 V and 5 V automotive microcontroller domains |
| Quiescent Current | 24–29 µA at +150°C to +160°C - minimizes self-heating (<0.02°C) and supports low-power ECU designs |
| Output Types | TOVER (active-high push-pull), TOVER (active-low open-drain) - supports direct MCU GPIO interfacing and wired-OR fault signaling |
Pinout & Package
TSSOP-8 (PW) package, 3.00 mm × 6.40 mm body size, 0.65 mm pitch, exposed pad not present.
| 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 input | Set trip temperature via external 1% resistor pair; determines both TTRIP and VTEMP gain slope (J2–J5) |
| VDD | Positive supply input | Accepts 2.4–5.5 V; powers internal bandgap, DAC, comparator, and output drivers |
| TRIP TEST | Digital test enable input | Active-high pin for in-system functional verification: asserts outputs and places VTRIP on VTEMP for threshold calibration |
| TOVER | Digital overtemp output | Push-pull active-high signal; drives directly into MCU interrupt or status pin without pull-up |
| TOVER | Digital overtemp output | Open-drain active-low signal; enables wired-OR fault bus with other sensors or controllers |
| VTEMP | Analog temperature output | Class AB voltage proportional to die temperature; slope programmable (−5.166 to −12.924 mV/°C); valid across full −50°C to +160°C range |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable trip point | 256 discrete thresholds from −50°C to +160°C using only two 1% external resistors - eliminates need for trimming or calibration |
| Latching function | TOVER output latches when tied to TRIP-TEST; cleared only by forcing TRIP-TEST low - enables persistent fault capture in unattended systems |
| In-system TRIP-TEST verification | Driving TRIP-TEST high forces outputs active and places VTRIP on VTEMP - allows real-time validation of comparator and output functionality post-assembly |
| Short-circuit protected outputs | Both TOVER and TOVER outputs include current limiting - prevents damage during wiring faults or ESD events in harsh automotive environments |
| Low self-heating | 24–29 µA quiescent current at 150–160°C - keeps measurement error below 0.02°C, critical for precision thermal monitoring |
Applications
| Engine Control Unit Thermal Monitoring | Transmission Control Module Protection |
|---|---|
Use Scenario: Real-time monitoring of powertrain ECU die temperature under high-load conditions. IC Role / Device Role / Timing Role: Dual-output thermal supervisor providing analog feedback to MCU ADC and digital fault signal to safety controller. Use Value: Enables dynamic derating before thermal shutdown; ±2.3°C trip accuracy ensures compliance with ISO 26262 ASIL-B thermal safety requirements. | Use Scenario: Overtemperature detection in automatic transmission control modules exposed to under-hood heat soak. IC Role / Device Role / Timing Role: Resistor-configurable switch triggering fail-safe mode when oil or electronics exceed 150°C. Use Value: 5°C hysteresis prevents false resets during thermal cycling; TSSOP-8 footprint supports compact PCB layout in space-constrained modules. |
| Electric Power Steering Motor Driver | Battery Management System Cell Monitoring |
Use Scenario: Protecting EPS motor driver MOSFETs from thermal runaway during sustained assist events. IC Role / Device Role / Timing Role: Analog VTEMP output feeds into MCU for predictive thermal throttling; TOVER triggers immediate torque reduction. Use Value: J2–J5 programmable gain allows optimal ADC utilization across −40°C to +160°C operating envelope. | Use Scenario: Monitoring temperature of high-voltage battery cell interconnects in 48 V mild-hybrid systems. IC Role / Device Role / Timing Role: Precision analog sensor feeding thermal model; TOVER signals BMS to disable charging if interconnect exceeds 125°C. Use Value: ±1.3°C VTEMP accuracy over −50°C to +150°C enables accurate state-of-health estimation without additional calibration. |
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 |
|---|---|---|---|
| LM57TSPWRQ1 | Same TSSOP-8 package and Grade 0 Extended rating, but factory-set 10°C hysteresis instead of 5°C | Suitable where wider thermal margin is needed before recovery, e.g., high-inertia systems with slow cooldown | Select LM57TSPWRQ1 only if 10°C hysteresis is explicitly required; otherwise LM57FSPWRQ1 provides tighter control |
| LM57FEPWRQ1 | Identical functionality and 5°C hysteresis, but rated for −50°C to +150°C (Standard Grade 0), not +160°C extended | Applicable in non-extended-temperature zones such as cabin electronics or infotainment ECUs | Choose LM57FEPWRQ1 for cost-sensitive designs where 160°C operation is unnecessary |
Compared with LM57TSPWRQ1 and LM57FEPWRQ1, the LM57FSPWRQ1 uniquely combines 5°C hysteresis, −50°C to +160°C operation, and AEC-Q100 Grade 0 Extended qualification - making it the only option for high-reliability engine bay thermal supervision requiring precise, chatter-free shutdown at extreme temperatures.
Availability
LM57FSPWRQ1 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for LM57FSPWRQ1 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 functional safety solutions.
The LM57-Q1 product line delivers AEC-Q100 qualified temperature switches with integrated analog sensing for automotive thermal management, designed specifically to meet ASIL-B safety integrity requirements in powertrain and chassis systems.
FAQ
What is the maximum operating temperature specification for LM57FSPWRQ1?
The LM57FSPWRQ1 is qualified for continuous operation from −50°C to +160°C per AEC-Q100 Grade 0 Extended requirements, with validated 170°C excursions during high-temperature operational life testing. This exceeds standard Grade 0 (−40°C to +150°C) and supports placement in demanding engine bay locations where ambient temperatures exceed 125°C.
How is the trip temperature programmed on LM57FSPWRQ1?
The trip temperature of LM57FSPWRQ1 is programmed using two external 1% resistors connected between SENSE1 and SENSE2 pins. Their ratio selects one of 256 possible trip points across −50°C to +160°C. The LM57FSPWRQ1's internal logic decodes the resistance ratio and configures both the trip threshold and corresponding VTEMP gain slope (J2–J5) without resistor tolerance error contribution.
Does LM57FSPWRQ1 support in-system functional testing?
Yes, LM57FSPWRQ1 supports in-system functional testing via the TRIP-TEST pin. Driving TRIP-TEST high asserts both TOVER and TOVER outputs and places the trip-reference voltage (VTRIP) on the VTEMP pin. This allows a host MCU to verify comparator response and output driver functionality after board assembly without requiring external thermal stimulus.
What are the key differences between LM57FSPWRQ1 and LM57TSPWRQ1?
The LM57FSPWRQ1 and LM57TSPWRQ1 share identical package, Grade 0 Extended rating (−50°C to +160°C), and resistor-programmable architecture, but differ in factory-set hysteresis: LM57FSPWRQ1 has 5°C hysteresis, while LM57TSPWRQ1 has 10°C. This makes LM57FSPWRQ1 preferable for applications requiring tighter thermal control and faster recovery after overtemperature events.
Is LM57FSPWRQ1 compatible with 3.3 V microcontrollers?
Yes, LM57FSPWRQ1 operates from 2.4 V to 5.5 V and is fully compatible with 3.3 V microcontrollers. Its TOVER output is push-pull with VOH ≥ VDD − 0.45 V (≥2.85 V at VDD = 3.3 V), and TOVER is open-drain with VOL ≤ 0.45 V - both meeting standard 3.3 V logic thresholds. Input thresholds (VIH ≥ VDD − 0.5 V, VIL ≤ 0.5 V) also ensure robust interface with 3.3 V GPIOs.
LM57FSPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- -
- Switching Temperature:
- -
- Accuracy:
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Output:
- -
- Output Function:
- -
- Selectable Hysteresis:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
LM57FSPWRQ1 FAQ
1.How can I place an order for LM57FSPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM57FSPWRQ1 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 LM57FSPWRQ1 reliable?
The price and inventory of LM57FSPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM57FSPWRQ1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM57FSPWRQ1 transactions.
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4.How is shipping managed for LM57FSPWRQ1?
LM57FSPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM57FSPWRQ1 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 LM57FSPWRQ1?
For technical support, including LM57FSPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM57FSPWRQ1 requirements.
6.How does Aetrix verify that LM57FSPWRQ1 is sourced from the original manufacturer or authorized distributors?
All LM57FSPWRQ1 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 LM57FSPWRQ1 meets industry standards.
7.What is the process for return or replacement of LM57FSPWRQ1?
All LM57FSPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM57FSPWRQ1, 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 LM57FSPWRQ1 part is unused and in its original packaging.
Return procedure for LM57FSPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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