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Texas Instruments TMP303BDRLR
- Part No.:
- TMP303BDRLR
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TMP303BDRLR.pdf
- Description:
- THERMOSTAT 55DEG ACT HI SOT563-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,240
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Product details
Overview
TMP303BDRLR from Texas Instruments is a factory-programmed temperature switch with dual trip thresholds (TL = 0°C, TH = 55°C), ±0.2°C typical accuracy from –40°C to 125°C, 5 μA maximum quiescent current, and push-pull active-high output - used in battery thermal protection circuits where low-power, self-contained overtemperature signaling is required.
For engineers reviewing the TMP303BDRLR datasheet, TMP303BDRLR pinout, TMP303BDRLR application, or TMP303BDRLR equivalent, key selection considerations include factory-set trip window (0°C/55°C), selectable hysteresis (1/2/5/10°C via HYSTSET pins), 1.4 V to 3.6 V supply operation, SOT-563 micropackage footprint, and SOH test-enabling functionality.
Technical Context
The TMP303BDRLR implements a comparator-based thermal sensing architecture with internal ADC and digital hysteresis logic. Its trip window (TL = 0°C, TH = 55°C) is fixed at wafer-level trim; no external calibration or microcontroller interface is needed for basic operation.
Hysteresis is set by two digital inputs (HYSTSET0/HYSTSET1), enabling four discrete windows (1°C, 2°C, 5°C, or 10°C). The SOH pin provides hardware-level output override independent of temperature, supporting system-level functional safety verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.4 V to 3.6 V - enables direct use with coin cells (e.g., 3 V CR2032) and low-voltage MCUs without LDO. |
| Quiescent Current | Max 5 μA - supports >10-year battery life in wireless heat detectors powered by 220 mAh coin cells. |
| Accuracy (–40°C to 125°C) | ±0.2°C typical, ±1.5°C max - ensures reliable trip decision within narrow thermal margins for Li-ion battery charging control. |
| Hysteresis Options | 1°C / 2°C / 5°C / 10°C - prevents output oscillation during slow thermal transients near trip points. |
| Output Type | Push-pull, active-high - eliminates need for external pull-up resistor, reducing BOM count and PCB area. |
| Package | SOT-563 (1.60 mm × 1.20 mm) - ultra-small footprint ideal for space-constrained wearables and IoT sensors. |
| Operating Range | –55°C to +130°C - exceeds industrial ambient requirements while maintaining specified accuracy from –40°C to +125°C. |
Pinout & Package
SOT-563 (DRL) package: 1.60 mm × 1.20 mm × 0.6 mm, 6-pin micropackage with exposed pad for thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HYSTSET0 | Digital input | Configures hysteresis window size with HYSTSET1; GND/VS logic selects 1/2/5/10°C options per Table 1. |
| GND | Ground reference | Primary return path for supply and internal sensor bias; must connect to low-impedance ground plane. |
| OUT | Digital output | Active-high push-pull signal indicating temperature breach; drives MCU GPIO or fan directly without pull-up. |
| SOH | Digital input | Forces OUT high regardless of temperature when pulled high; internal 100 kΩ pulldown enables floating-safe default. |
| VS | Power supply | Single 1.4–3.6 V rail powers sensor, logic, and output stage; bypass capacitor (0.1 µF) required at pin. |
| HYSTSET1 | Digital input | Second hysteresis configuration bit; combined with HYSTSET0, defines exact hysteresis value per datasheet table. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed trip window | TMP303BDRLR has fixed TL = 0°C and TH = 55°C - eliminates field calibration and firmware dependency for battery thermal cutoff. |
| Ultra-low power consumption | 5 μA max IQ enables >10-year operation on 220 mAh coin cell in always-on wireless heat detectors. |
| Selectable hysteresis | Four discrete hysteresis values (1/2/5/10°C) prevent chatter during thermal ramping without software intervention. |
| SOH test enable pin | Hardware-level output override allows production-line functional test of OUT signal path without thermal chamber. |
| No external components required | Operates standalone with only 0.1 µF bypass capacitor - reduces BOM, layout complexity, and failure modes. |
Applications
| Battery Thermal Protection | Wireless Heat Detection |
|---|---|
|
Use Scenario: Monitoring Li-ion battery pack temperature during fast charging to prevent thermal runaway. IC Role / Device Role / Timing Role: Standalone temperature switch asserting active-high signal when cell temperature exceeds 55°C. Use Value: Prevents unsafe charging conditions using factory-set trip point and 2°C hysteresis to avoid repeated cycling near threshold. |
Use Scenario: Battery-powered ceiling-mounted heat detector in legacy buildings lacking wired infrastructure. IC Role / Device Role / Timing Role: Primary thermal sensing element interfacing directly with wireless MCU GPIO. Use Value: Enables >5-year battery life via 5 μA max IQ and eliminates external passives, reducing node cost and size. |
| Fan Control in Portable Devices | Consumer Electronics Overtemperature Cutoff |
|
Use Scenario: Activating cooling fan in compact projectors or portable SSD enclosures when internal temperature rises. IC Role / Device Role / Timing Role: Direct drive of small DC fan via push-pull OUT pin; no level-shifting or driver IC needed. Use Value: Reduces component count and PCB area while ensuring fan deactivates cleanly at 54°C (55°C – 1°C hysteresis). |
Use Scenario: Preventing overheating in Bluetooth earbuds during extended playback or charging. IC Role / Device Role / Timing Role: Self-contained thermal cutoff that disables charging circuitry when earbud case reaches 55°C. Use Value: Meets IEC 62368-1 surface temperature limits using ±0.2°C typical accuracy and 1.4 V minimum supply compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6505UTP+T | Fixed 50°C trip, ±3°C accuracy, 12 μA IQ, SC70-5 package | Lower accuracy and higher current limit use cases where 55°C trip is not mandatory | Choose for cost-sensitive consumer applications where ±3°C tolerance is acceptable and 55°C precision is unnecessary. |
| LM75BIMM/NOPB | I²C digital output, ±2°C accuracy, 250 μA active current, SOIC-8 package | Requires MCU firmware support and higher power; suited for systems needing programmable thresholds | Choose only if dynamic trip-point adjustment or multi-sensor daisy-chaining is required - not a drop-in replacement. |
Compared with MAX6505UTP+T and LM75BIMM/NOPB, the TMP303BDRLR delivers superior accuracy (±0.2°C vs ±3°C/±2°C), lowest power (5 μA vs 12 μA/250 μA), and smallest footprint (SOT-563 vs SC70-5/SOIC-8), making it optimal for space- and battery-limited thermal cutoffs.
Availability
TMP303BDRLR is available at Aetrix Electronics and suitable for battery thermal protection, wireless heat detection, portable fan control, and consumer electronics overtemperature cutoff requiring stable component supply and long-term lifecycle support.
Supply support for TMP303BDRLR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.
The TMP303 family is designed for ultra-low-power, factory-configured thermal monitoring in battery-operated and space-constrained systems - emphasizing simplicity, reliability, and minimal external component count.
FAQ
What is the factory-set trip temperature range for TMP303BDRLR?
The TMP303BDRLR is factory-programmed with a fixed low trip point (TL) of 0°C and high trip point (TH) of 55°C. This window cannot be altered post-manufacture. It is part of the TMP303B variant, distinct from other members like TMP303A (0°C/60°C) or TMP303D (–15°C/125°C). The TMP303BDRLR operates as a dual-threshold switch, asserting its active-high output when temperature exceeds TH or falls below TL.
Does TMP303BDRLR require a pull-up resistor on the OUT pin?
No, TMP303BDRLR features a push-pull output stage, so no external pull-up resistor is needed on the OUT pin. It actively drives high (up to VS – 0.4 V at 0.5 mA) and low (down to 0.4 V at 1 mA) without external components. This simplifies design, saves PCB space, and eliminates resistor tolerance and leakage concerns - a key advantage over open-drain alternatives like the LM75BIMM/NOPB.
How is hysteresis configured on TMP303BDRLR?
Hysteresis on TMP303BDRLR is set using two digital input pins: HYSTSET0 and HYSTSET1. Each pin is tied either to GND or VS to select one of four hysteresis values: 1°C (both GND), 2°C (HYSTSET0 = GND, HYSTSET1 = VS), 5°C (HYSTSET0 = VS, HYSTSET1 = GND), or 10°C (both VS). These pins have no internal default state and must be externally biased - floating connections are undefined and must be avoided.
What is the minimum supply voltage required for TMP303BDRLR to operate correctly?
TMP303BDRLR operates across a supply range of 1.4 V to 3.6 V. At 1.4 V, it maintains full functionality including ±1.5°C accuracy (–40°C to 125°C), 35 ms max power-up time, and valid logic levels. This enables direct use with 1.5 V alkaline cells (with aging margin) or 2.0–3.6 V lithium chemistries - critical for long-life battery applications where voltage droop occurs over time.
Can the SOH pin be left unconnected on TMP303BDRLR?
Yes, the SOH pin on TMP303BDRLR has an internal 100 kΩ pulldown resistor, so it is safe to leave unconnected (floating). In this state, SOH has no effect on device behavior - the OUT pin responds solely to temperature crossing the trip window and hysteresis settings. Pulling SOH high forces OUT high regardless of temperature, a feature used for production testing or emergency shutdown override.
TMP303BDRLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-563, SOT-666
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 55°C
- Accuracy:
- ±1°C
- Current - Output (Max):
- 8mA
- Output Type:
- Push-Pull
- Output:
- Active High
- Output Function:
- OverTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Hysteresis
- Voltage - Supply:
- 1.4 V ~ 3.6 V
- Current - Supply:
- 4µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-5X3
TMP303BDRLR FAQ
1.How can I place an order for TMP303BDRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP303BDRLR 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 TMP303BDRLR reliable?
The price and inventory of TMP303BDRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP303BDRLR is usually 5 days.
3.What payment methods are accepted for TMP303BDRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP303BDRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP303BDRLR?
TMP303BDRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP303BDRLR 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 TMP303BDRLR?
For technical support, including TMP303BDRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP303BDRLR requirements.
6.How does Aetrix verify that TMP303BDRLR is sourced from the original manufacturer or authorized distributors?
All TMP303BDRLR 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 TMP303BDRLR meets industry standards.
7.What is the process for return or replacement of TMP303BDRLR?
All TMP303BDRLR units undergo pre-shipment inspection (PSI). If there is an issue with TMP303BDRLR, 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 TMP303BDRLR part is unused and in its original packaging.
Return procedure for TMP303BDRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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