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Texas Instruments TMP303DDRLR
- Part No.:
- TMP303DDRLR
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TMP303DDRLR.pdf
- Description:
- THERMOSTAT 125DEG PSH-PUL SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:4,349
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Product details
Overview
TMP303DDRLR from Texas Instruments is a factory-programmed temperature switch with dual trip thresholds (TL = –15°C, TH = 125°C), ±0.2°C typical accuracy over –40°C to 125°C, 5 μA maximum quiescent current, and push-pull active-high output-designed for battery thermal protection in portable electronics.
For engineers reviewing the TMP303DDRLR datasheet, TMP303DDRLR pinout, TMP303DDRLR application, or TMP303DDRLR equivalent, key selection criteria include factory-set trip window, selectable 1/2/5/10°C hysteresis via HYSTSET pins, 1.4 V to 3.6 V supply operation, SOT-563 micropackage footprint, and SOH test-enable functionality.
Technical Context
The TMP303DDRLR implements a fully integrated analog temperature sensor core with comparator-based trip logic, fixed TL/TH thresholds set at wafer-level trimming, and digital hysteresis control via two dedicated input pins (HYSTSET0/HYSTSET1). No external components or microcontroller interface are required for basic operation.
Its push-pull output drives directly into logic inputs or low-power loads without pull-up resistors; the SOH pin provides hardware-level output forcing independent of temperature sensing, enabling system-level connectivity verification during production test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.4 V to 3.6 V - enables direct use with coin-cell, Li-ion, or low-voltage MCU rails without regulation |
| Quiescent Current | 4 μA to 8 μA - supports multi-year battery life in always-on thermal monitoring applications |
| Accuracy (Typ) | ±0.2°C from –40°C to 125°C - ensures precise trip-point consistency across industrial temperature range |
| Hysteresis Options | 1°C / 2°C / 5°C / 10°C - configurable via HYSTSET0/HYSTSET1 pin states to prevent output chatter near threshold |
| Output Type | Push-pull, active-high - eliminates need for external pull-up resistor and reduces BOM count |
| Operating Range | –55°C to +130°C - exceeds rated trip window (–15°C to +125°C) for robustness in transient conditions |
| Power-Up Delay | 20 ms to 35 ms - defines minimum time before valid output state is established after VS ramp |
Pinout & Package
SOT-563 (DRL) package: 1.60 mm × 1.20 mm × 0.6 mm body size, 6-pin surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HYSTSET0 | Digital input | Selects hysteresis value (with HYSTSET1); tied to GND or VS to configure 1/2/5/10°C window |
| GND | Ground reference | Primary return path for sensor core, comparator, and output driver; requires low-impedance PCB connection |
| OUT | Digital output | Active-high push-pull signal indicating temperature breach; sinks up to 1 mA, sources up to 0.5 mA |
| SOH | Digital input | Forces OUT high regardless of temperature when pulled above 0.7×VS; internal 100-kΩ pulldown enables floating-safe default |
| VS | Power supply | Single 1.4–3.6 V rail powers entire device; bypass capacitor (0.1 µF) required adjacent to this pin |
| HYSTSET1 | Digital input | Second hysteresis control bit; combined with HYSTSET0 per Table 1 in datasheet to define hysteresis step |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed trip points | TL = –15°C and TH = 125°C permanently programmed - eliminates field calibration and reduces design validation effort |
| Ultra-low power consumption | 5 μA max quiescent current - enables integration into energy-harvesting or coin-cell-powered systems |
| No external components required | Operates standalone with only 0.1 µF bypass capacitor - reduces PCB area, cost, and failure modes |
| SOH test-enabling pin | Hardware-level output override for production test - verifies OUT pin continuity and downstream logic without thermal cycling |
| Wide supply voltage range | 1.4 V to 3.6 V operation - supports direct interfacing with aging batteries and low-VDD MCUs |
Applications
| Battery Thermal Protection | Fan Control System |
|---|---|
Use Scenario: Monitoring Li-ion battery pack temperature during charging/discharging to prevent thermal runaway. IC Role / Device Role / Timing Role: Temperature switch asserting active-high signal when cell temperature exceeds 125°C upper threshold. Use Value: Enables immediate charge termination or system shutdown using only one GPIO, with no software overhead or ADC conversion latency. | Use Scenario: Activating cooling fan in embedded industrial controller when ambient temperature rises beyond safe operating limit. IC Role / Device Role / Timing Role: Direct drive of fan enable line via push-pull OUT pin; hysteresis prevents rapid on/off cycling near trip point. Use Value: Eliminates need for external transistor or level-shifter; 10°C hysteresis setting ensures stable fan operation across thermal gradients. |
| Wireless Heat Detector | Consumer Electronics Thermal Guard |
Use Scenario: Battery-powered wireless smoke/heat detector requiring multi-year operation without maintenance. IC Role / Device Role / Timing Role: Fixed-threshold thermal trigger interfaced to ultra-low-power wireless MCU GPIO. Use Value: 5 μA max current draw extends CR2032 battery life beyond 5 years; SOH pin allows automated end-of-line functional test. | Use Scenario: Overtemperature safeguard in Bluetooth earbuds or smartwatches where internal SoC heating must be monitored. IC Role / Device Role / Timing Role: Compact thermal watchdog detecting enclosure temperature rise beyond 125°C during sustained compute load. Use Value: SOT-563 footprint (1.6 × 1.2 mm) fits constrained wearable PCBs; 1.4 V minimum supply supports operation down to depleted battery voltage. |
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 125°C trip, open-drain output, 1.7–5.5 V supply, 12 μA quiescent current | Lacks hysteresis selection and SOH test pin; requires external pull-up | Choose when higher supply voltage tolerance is needed but hysteresis flexibility and testability are secondary |
| LM75BIMM/NOPB | I²C digital temperature sensor with programmable thresholds, 250 μA active current, 1.7–3.6 V supply | Requires MCU firmware, I²C bus, and periodic polling - not a direct hardware trip solution | Choose when adaptive threshold adjustment or temperature telemetry is required, not simple binary alerting |
Compared with MAX6505UTP+T and LM75BIMM/NOPB, TMP303DDRLR delivers lower power, hardware-configurable hysteresis, and built-in testability - making it optimal for cost-sensitive, battery-constrained systems needing deterministic, zero-software thermal response.
Availability
TMP303DDRLR is available at Aetrix Electronics and suitable for battery thermal protection, fan control systems, wireless heat detectors, and consumer electronics thermal guard applications requiring stable component supply and long-lifecycle support.
Supply support for TMP303DDRLR 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
The TMP303 product line delivers factory-programmed, ultra-low-power temperature switches optimized for battery-operated thermal safety systems where simplicity, reliability, and minimal bill-of-materials are critical.
FAQ
What is the exact trip temperature range configured for TMP303DDRLR?
The TMP303DDRLR is factory-programmed with a lower trip point (TL) of –15°C and an upper trip point (TH) of +125°C. These thresholds are permanently trimmed during manufacturing and cannot be adjusted in-circuit. The device asserts its active-high output when temperature exceeds TH or falls below TL, depending on hysteresis configuration and prior state.
How is hysteresis selected on TMP303DDRLR?
Hysteresis on TMP303DDRLR is selected by connecting HYSTSET0 and HYSTSET1 to either GND or VS according to TI's defined mapping: GND/GND = 1°C, GND/VS = 2°C, VS/GND = 5°C, VS/VS = 10°C. No external resistors or logic are needed - direct hard-wiring suffices. This configuration is latched at power-up and remains static during operation.
Does TMP303DDRLR require a pull-up resistor on the OUT pin?
No, TMP303DDRLR does not require a pull-up resistor on the OUT pin because it features a true push-pull output stage capable of actively driving both high and low states. The OUT pin sources up to 0.5 mA when high and sinks up to 1 mA when low, enabling direct interface with CMOS inputs or low-power loads without additional components.
What is the role of the SOH pin on TMP303DDRLR?
The SOH (Set Output High) pin on TMP303DDRLR is a dedicated test input that forces the OUT pin to logic high regardless of measured temperature when pulled above 0.7×VS. Internally pulled down with a 100-kΩ resistor, it remains inactive when grounded or floating - enabling production test verification of output path integrity without thermal chamber cycling.
Can TMP303DDRLR operate from a 1.5 V alkaline battery?
Yes, TMP303DDRLR supports operation down to 1.4 V, making it compatible with single 1.5 V alkaline or zinc-carbon cells across their full discharge curve. Its 5 μA maximum quiescent current ensures usable runtime even as battery voltage declines, and its output logic levels scale with supply (e.g., VOH ≥ 0.8×VS), maintaining compatibility with downstream 1.8 V logic.
TMP303DDRLR 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:
- 125°C
- Accuracy:
- ±0.2°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
TMP303DDRLR FAQ
1.How can I place an order for TMP303DDRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP303DDRLR 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 TMP303DDRLR reliable?
The price and inventory of TMP303DDRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP303DDRLR is usually 5 days.
3.What payment methods are accepted for TMP303DDRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP303DDRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP303DDRLR?
TMP303DDRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP303DDRLR 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 TMP303DDRLR?
For technical support, including TMP303DDRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP303DDRLR requirements.
6.How does Aetrix verify that TMP303DDRLR is sourced from the original manufacturer or authorized distributors?
All TMP303DDRLR 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 TMP303DDRLR meets industry standards.
7.What is the process for return or replacement of TMP303DDRLR?
All TMP303DDRLR units undergo pre-shipment inspection (PSI). If there is an issue with TMP303DDRLR, 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 TMP303DDRLR part is unused and in its original packaging.
Return procedure for TMP303DDRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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