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Texas Instruments LM57FSPWQ1
- Part No.:
- LM57FSPWQ1
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM57FSPWQ1.pdf
- Description:
- THERMOSTAT PROG ACT HI/LO 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
LM57FSPWQ1 from Texas Instruments is an AEC-Q100 Grade 0 Extended automotive temperature switch and analog sensor IC with dual digital outputs (push-pull TOVER and open-drain TOVER), programmable trip point (±2.3°C accuracy from −40°C to +150°C, ±2.5°C at 150–160°C), ±1.3°C VTEMP analog sensor accuracy (−50°C to +150°C), and 5°C hysteresis - used for overtemperature protection in engine control units, battery management systems, and powertrain modules.
For engineers reviewing the LM57FSPWQ1 datasheet, LM57FSPWQ1 pinout, LM57FSPWQ1 application, or LM57FSPWQ1 equivalent, key selection criteria include its extended 160°C operational range, resistor-programmable trip point via SENSE1/SENSE2, J2–J5 selectable NTC gain (e.g., −5.166 mV/°C), TRIP-TEST latching capability, and TSSOP-8 packaging qualified for automotive Grade 0 Extended (−50°C to +160°C).
Technical Context
The LM57FSPWQ1 integrates a precision analog temperature sensor, DAC-based reference generator, and dual-comparator switching circuitry. Its VTEMP output uses class AB architecture with four programmable negative temperature coefficient (NTC) gains (J2–J5), each mapped to specific trip-point ranges set by external 1% resistors on SENSE1/SENSE2.
Digital outputs are functionally independent: TOVER is active-high push-pull; TOVER is active-low open-drain with external pull-up requirement. Built-in 5°C hysteresis prevents chatter during thermal transitions, and TRIP-TEST enables in-system functional verification by forcing both digital outputs active and routing VTRIP to VTEMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −50°C to +160°C (Grade 0 Extended), with 170°C storage rating - supports under-hood automotive applications. |
| VTEMP Accuracy | ±1.3°C (−50°C to +150°C); ±1.5°C (150°C to +160°C) - enables high-fidelity thermal monitoring without calibration. |
| Tript Point Accuracy | ±2.3°C (−40°C to +150°C); ±2.5°C (150°C to +160°C) - ensures reliable overtemperature shutdown across full grade range. |
| VTEMP Gain Options | J2 = −5.166 mV/°C, J3 = −7.752 mV/°C, J4 = −10.339 mV/°C, J5 = −12.924 mV/°C - gain selected automatically by resistor ratio on SENSE pins. |
| Hysteresis | 5°C (factory-set for F-series) - prevents oscillation near trip threshold in noisy thermal environments. |
| Supply Voltage | +2.4 V to +5.5 V - compatible with 3.3 V and 5 V automotive microcontroller I/O domains. |
| Quiescent Current | 24–29 µA (TA = 150–160°C) - minimizes self-heating (<0.02°C) and supports low-power always-on monitoring. |
Pinout & Package
Packaged in PW/TSSOP-8 (3.00 mm × 6.40 mm), the LM57FSPWQ1 features a thermally enhanced layout optimized for automotive PCBs with exposed pad grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Power ground reference | Primary return path for analog and digital circuits; must be low-impedance connection to system ground plane. |
| SENSE1 / SENSE2 | Resistor divider input | Set trip temperature (TTRIP) and VTEMP gain via external 1% resistor pair; tolerance contributes zero error to threshold accuracy. |
| VDD | Positive supply input | Accepts 2.4–5.5 V; powers internal bandgap, DAC, comparators, and output drivers. |
| TRIP TEST | Digital test enable input | Active-high signal that asserts both TOVER/TOVER and routes VTRIP to VTEMP for production testing and fault verification. |
| TOVER | Digital output (active-high) | Push-pull structure drives high when T ≥ TTRIP; no external pull-up required; directly interfaces with MCU GPIO. |
| TOVER | Digital output (active-low) | Open-drain output requires external pull-up; used for wired-OR fault signaling or driving external logic gates. |
| VTEMP | Analog temperature voltage output | Class AB output proportional to die temperature; slope determined by SENSE resistors; 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 EEPROM calibration. |
| Latching function via TRIP-TEST | Tying TOVER to TRIP-TEST creates hardware latch; output remains asserted until TRIP-TEST is pulled low - enables fail-safe alarm persistence. |
| Short-circuit protected outputs | Both TOVER and TOVER include current limiting and thermal foldback - survives sustained short-to-rail or ESD events without damage. |
| In-system TRIP-TEST verification | Driving TRIP-TEST high forces known VTRIP voltage onto VTEMP and activates outputs - allows post-assembly validation of comparator and driver functionality. |
| Low self-heating design | 24–29 µA quiescent current limits die temperature rise to <0.02°C - preserves measurement integrity in thermally sensitive placements. |
Applications
| Engine Control Unit (ECU) Thermal Monitoring | Battery Management System (BMS) Overtemperature Protection |
|---|---|
Use Scenario: Real-time monitoring of cylinder head or intake manifold temperature in gasoline/diesel powertrains. IC Role / Device Role / Timing Role: Analog VTEMP provides continuous temperature feedback to ECU ADC; TOVER triggers immediate fuel cut-off or fan activation upon exceeding 155°C. Use Value: Enables compliance with ISO 26262 ASIL-B thermal safety requirements using single IC with dual redundant outputs and latch capability. | Use Scenario: Cell-level or module-level overtemperature detection in 48 V mild-hybrid or EV traction battery packs. IC Role / Device Role / Timing Role: LM57FSPWQ1 senses pack temperature; TOVER signals BMS controller to disable charging; TOVER drives external MOSFET gate for hardware-level disconnect. Use Value: 5°C hysteresis and 160°C operation ensure stable response during fast thermal transients in high-current discharge cycles. |
| Power Inverter Thermal Shutdown | Automotive Lighting Driver Thermal Guard |
Use Scenario: Protection of IGBT/MOSFET gate drivers and DC-link capacitors in onboard chargers and DC-DC converters. IC Role / Device Role / Timing Role: Mounted adjacent to power stage; VTEMP feeds thermal loop compensation; TOVER initiates soft-shutdown sequence before junction exceeds 175°C. Use Value: Extended 170°C storage rating and HTOL-tested reliability support 15+ year field life in high-ambient under-hood environments. | Use Scenario: Thermal supervision of LED driver ICs and high-brightness LED arrays in adaptive front lighting systems (AFS). IC Role / Device Role / Timing Role: Monitors heatsink temperature; TOVER asserts to dim LEDs or reduce PWM duty cycle; TRIP-TEST validates function during vehicle startup self-test. Use Value: ±1.3°C VTEMP accuracy enables precise derating curves, extending LED lifetime while maintaining photometric performance. |
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 |
|---|---|---|---|
| LM57TSPWQ1 | Same TSSOP-8 package and Grade 0 Extended rating, but factory-set 10°C hysteresis instead of 5°C. | Suitable where wider thermal deadband is acceptable to prevent nuisance trips in high-noise environments (e.g., alternator proximity). | Select LM57TSPWQ1 if system thermal dynamics require greater margin between trip and release points. |
| LM57FEPWQ1 | Identical 5°C hysteresis and accuracy specs, but rated for Standard Grade 0 (−50°C to +150°C), not Extended (+160°C). | Valid for cabin electronics, infotainment, or ADAS ECUs where peak ambient does not exceed 150°C. | Choose LM57FEPWQ1 for cost-sensitive non-under-hood applications with lower max temperature requirement. |
Compared with LM57TSPWQ1 and LM57FEPWQ1, the LM57FSPWQ1 uniquely delivers 5°C hysteresis *plus* guaranteed operation up to +160°C - making it the only option for high-reliability under-hood thermal protection requiring tight trip/release control at extreme temperatures.
Availability
LM57FSPWQ1 is available at Aetrix Electronics and suitable for automotive powertrain control, battery management, and high-temperature industrial sensing applications requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle continuity.
Supply support for LM57FSPWQ1 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 delivering analog, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.
The LM57-Q1 product line was designed specifically for AEC-Q100-compliant automotive thermal monitoring - combining precision analog sensing, programmable digital switching, and robust fault-test capability in a single monolithic IC.
FAQ
What is the maximum operating temperature specification for the LM57FSPWQ1?
The LM57FSPWQ1 is rated for continuous operation from −50°C to +160°C (AEC-Q100 Grade 0 Extended). It also supports storage up to +175°C and has passed High-Temperature Operating Life (HTOL) testing at 170°C for 10 hours - confirming suitability for under-hood automotive locations such as engine compartments and transmission control modules.
How does the LM57FSPWQ1 achieve ±2.3°C trip point accuracy despite using external resistors?
The LM57FSPWQ1 achieves ±2.3°C trip point accuracy because its internal DAC interprets the resistance ratio on SENSE1/SENSE2 as one of 16 discrete logic levels - effectively digitizing the analog resistor value. Since only the ratio matters (not absolute tolerance), 1% external resistors contribute zero error to the final threshold setting, and accuracy is dominated by internal DAC and comparator matching.
Can the LM57FSPWQ1's VTEMP output drive an ADC input directly without buffering?
Yes, the LM57FSPWQ1's VTEMP output can drive most microcontroller ADC inputs directly. It supports capacitive loads up to 1100 pF and source/sink currents up to ±300 µA, with load regulation error ≤1 mV. For 12-bit ADCs with 3.3 V reference, this introduces <0.03% full-scale error - well within typical system accuracy budgets.
What is the purpose of the TRIP-TEST pin on the LM57FSPWQ1, and how is it used in production testing?
The TRIP-TEST pin on the LM57FSPWQ1 is an active-high input that forces both TOVER and TOVER outputs into their asserted states and routes the internal VTRIP reference voltage to the VTEMP pin. During production, applying logic high to TRIP-TEST allows automated test equipment to verify comparator functionality, output driver integrity, and signal routing - all without requiring actual thermal excitation.
Does the LM57FSPWQ1 require external pull-up resistors on its digital outputs?
Only TOVER (active-low open-drain) requires an external pull-up resistor; TOVER (active-high push-pull) does not. The recommended pull-up for TOVER is 4.7 kΩ to VDD, ensuring logic-high levels >0.7×VDD while limiting current to <1 mA during assertion. No series resistor is needed on VTEMP, and no pull-up is required on TRIP-TEST (high-impedance CMOS input).
LM57FSPWQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- 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
LM57FSPWQ1 FAQ
1.How can I place an order for LM57FSPWQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM57FSPWQ1 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 LM57FSPWQ1 reliable?
The price and inventory of LM57FSPWQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM57FSPWQ1 is usually 5 days.
3.What payment methods are accepted for LM57FSPWQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM57FSPWQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM57FSPWQ1?
LM57FSPWQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM57FSPWQ1 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 LM57FSPWQ1?
For technical support, including LM57FSPWQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM57FSPWQ1 requirements.
6.How does Aetrix verify that LM57FSPWQ1 is sourced from the original manufacturer or authorized distributors?
All LM57FSPWQ1 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 LM57FSPWQ1 meets industry standards.
7.What is the process for return or replacement of LM57FSPWQ1?
All LM57FSPWQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM57FSPWQ1, 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 LM57FSPWQ1 part is unused and in its original packaging.
Return procedure for LM57FSPWQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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