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Texas Instruments TMP303EDRLR
- Part No.:
- TMP303EDRLR
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TMP303EDRLR.pdf
- Description:
- THERMOSTAT 70DEG ACT HI SOT563-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
TMP303EDRLR from Texas Instruments is a factory-programmed, low-power temperature switch with fixed trip window (TL = 0°C, TH = 70°C), ±0.2°C typical accuracy from –20°C to 60°C, 5 μA maximum quiescent current, and push-pull active-high output - used for battery thermal protection and fan control in space-constrained portable electronics.
For engineers reviewing the TMP303EDRLR datasheet, TMP303EDRLR pinout, TMP303EDRLR application, or TMP303EDRLR equivalent, key selection criteria include factory-set 0°C/70°C trip points, 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-enabling functionality.
Technical Context
The TMP303EDRLR integrates a precision bandgap temperature sensor, digital trip-point logic, and push-pull output driver - operating autonomously without MCU intervention. Its trip thresholds are laser-trimmed at wafer test and permanently fixed per device variant (TMP303E = 0°C/70°C).
Hysteresis is configured statically via two digital input pins (HYSTSET0/HYSTSET1), selecting discrete windows of 1°C, 2°C, 5°C, or 10°C; the SOH pin provides forced high-output override for system-level connectivity verification independent of temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.4 V to 3.6 V - enables direct operation from coin cells (e.g., 3 V CR2032) and low-voltage Li-ion systems without LDO. |
| Quiescent Current | 4 μA to 8 μA over –40°C to 125°C - supports >10-year battery life in wireless heat detectors. |
| Accuracy | ±0.2°C typical (–20°C to 60°C), ±1.5°C max (–20°C to 60°C at 1.4 V) - ensures reliable thermal threshold detection without calibration. |
| Hysteresis Options | 1°C / 2°C / 5°C / 10°C - prevents output oscillation near trip point; selected by static HYSTSET0/HYSTSET1 logic levels. |
| Output Type | Push-pull, active-high - eliminates need for external pull-up resistor; drives loads directly (e.g., MOSFET gate or fan enable line). |
| Operating Range | –40°C to 125°C ambient - supports industrial and automotive under-hood environments despite 0°C/70°C trip window. |
| Power-Up Delay | 20 ms to 35 ms - defines minimum time before valid output state; critical for power-on sequencing in battery-powered systems. |
Pinout & Package
SOT-563 (DRL) package: 1.60 mm × 1.20 mm × 0.6 mm body, 6-pin ultra-miniature surface-mount outline with 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HYSTSET0 | Digital input | Selects hysteresis window (with HYSTSET1); tied to GND or VS to configure 1/2/5/10°C hysteresis. |
| GND | Ground reference | Primary return path for supply and internal sensor circuitry; requires low-impedance PCB connection. |
| OUT | Digital output | Active-high push-pull output; sinks up to 1 mA or sources up to 0.5 mA; no external pull-up needed. |
| SOH | Digital input | Set Output High override; internal 100 kΩ pulldown; pulling high forces OUT = high regardless of temperature. |
| VS | Power supply | Single 1.4–3.6 V supply input; bypassed with 0.1 µF ceramic capacitor placed adjacent to pin. |
| HYSTSET1 | Digital input | Second hysteresis configuration bit; combined with HYSTSET0 to select one of four hysteresis values. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed trip points | TMP303E variant permanently set to TL = 0°C, TH = 70°C - eliminates external programming or configuration overhead. |
| Ultra-low quiescent current | 5 μA maximum - enables multi-year operation on coin-cell batteries in wireless thermal sensors. |
| Push-pull output architecture | No external pull-up required - reduces BOM count and PCB area; simplifies interface to GPIO or logic inputs. |
| SOH test-enable pin | Internal 100 kΩ pulldown - allows system-level continuity check of OUT signal path without temperature cycling. |
| SOT-563 micropackage | 1.60 mm × 1.20 mm footprint - fits in tight spaces such as wearable devices, hearing aids, and compact IoT nodes. |
Applications
| Battery Thermal Protection | Fan Control |
|---|---|
Use Scenario: Monitors lithium-ion battery pack temperature during charging to prevent thermal runaway. IC Role / Device Role / Timing Role: Standalone temperature switch asserting fault signal when cell temperature exceeds 70°C. Use Value: Prevents unsafe charging conditions using factory-calibrated trip point and 1°C hysteresis to avoid chatter near threshold. | Use Scenario: Activates cooling fan when processor or power stage temperature exceeds 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. Use Value: Eliminates need for microcontroller polling or ADC-based thermal management, reducing firmware complexity and power. |
| Wireless Heat Detector | Consumer Portable Electronics |
Use Scenario: Battery-powered building heat detector transmitting alarm when ambient temperature exceeds 70°C. IC Role / Device Role / Timing Role: Primary thermal sensing element interfaced to low-power wireless MCU via single GPIO. Use Value: 5 μA max current extends battery life beyond 5 years; SOH pin enables end-of-line functional test without thermal chamber. | Use Scenario: Overtemperature shutdown in Bluetooth earbuds or smartwatches during high-CPU-load operation. IC Role / Device Role / Timing Role: Trip-triggered disable of charging circuit or performance throttling signal to SoC. Use Value: SOT-563 size fits within 3×3 mm board area constraints; 1.4 V minimum supply supports direct connection to buck-boost regulator output. |
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 70°C trip, open-drain output, 1.7–5.5 V supply, 12 μA quiescent current | Lacks SOH test pin and hysteresis selection; 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, 1.7–5.5 V supply | Requires MCU interface and firmware; not a drop-in replacement for simple on/off switching | Choose only if dynamic threshold adjustment or temperature readback is required - not for fixed-threshold monitoring. |
Compared with MAX6505UTP+T and LM75BIMM/NOPB, TMP303EDRLR delivers lower power, smaller footprint, and integrated hysteresis/SOH functionality - making it optimal for cost-sensitive, battery-operated thermal cutoff applications where simplicity and autonomy are critical.
Availability
TMP303EDRLR is available at Aetrix Electronics and suitable for battery thermal protection, fan control, wireless heat detection, and consumer portable electronics requiring stable component supply across long production lifecycles.
Supply support for TMP303EDRLR 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, embedded processing, and connectivity technologies with leadership in precision analog ICs and low-power sensor solutions.
The TMP303 product line delivers factory-configured, ultra-low-power temperature switches for autonomous thermal monitoring in space- and energy-constrained systems - designed specifically for battery-powered IoT, wearables, and industrial safety applications.
FAQ
What is the factory-set trip temperature range for TMP303EDRLR?
The TMP303EDRLR is factory-programmed with a fixed low-trip point (TL) of 0°C and high-trip point (TH) of 70°C. This specific trip window is unique to the TMP303E variant and cannot be altered in the field. The device operates as a dual-threshold temperature switch, asserting its active-high output when temperature rises above 70°C or falls below 0°C - making TMP303EDRLR ideal for overtemperature and undertemperature protection in battery-powered systems.
Does TMP303EDRLR require external components to operate?
No, TMP303EDRLR functions autonomously with no external components required for basic operation. Only a 0.1 µF ceramic bypass capacitor on the VS pin is recommended to suppress supply noise - TI specifies this as best practice but confirms the device will operate without it under clean supply conditions. TMP303EDRLR contains an integrated temperature sensor, trip logic, hysteresis control, and push-pull output driver, eliminating the need for microcontrollers, ADCs, or external resistors for hysteresis configuration.
How is hysteresis configured on TMP303EDRLR?
Hysteresis on TMP303EDRLR is configured using two digital input pins: HYSTSET0 and HYSTSET1. These pins must be hard-wired to either GND or VS (supply) to select one of four discrete hysteresis values: 1°C (both pins GND), 2°C (HYSTSET0 = GND, HYSTSET1 = VS), 5°C (HYSTSET0 = VS, HYSTSET1 = GND), or 10°C (both pins VS). The configuration is static and determined at power-up; TMP303EDRLR does not support dynamic hysteresis adjustment during operation.
What is the purpose of the SOH pin on TMP303EDRLR?
SOH (Set Output High) is a dedicated test-enable input on TMP303EDRLR with an internal 100 kΩ pulldown resistor. When SOH is pulled high (≥0.7 × VS), the OUT pin is forced high regardless of measured temperature - enabling system-level continuity verification of the output signal path without requiring thermal cycling. If SOH is grounded or left floating, it has no effect on TMP303EDRLR behavior, allowing seamless integration into designs where test access is optional.
Can TMP303EDRLR operate from a 1.8 V supply?
Yes, TMP303EDRLR fully supports 1.8 V operation within its specified 1.4 V to 3.6 V supply range. At 1.8 V, electrical characteristics remain guaranteed: trip accuracy holds at ±0.2°C typical (–20°C to 60°C), quiescent current stays ≤8 μA, and output logic levels meet VOH ≥1.4 V (at 0.5 mA sink) and VOL ≤0.36 V (at 1 mA source). This makes TMP303EDRLR compatible with common low-voltage rails in modern portable electronics and IoT edge nodes.
TMP303EDRLR 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:
- 70°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
TMP303EDRLR FAQ
1.How can I place an order for TMP303EDRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP303EDRLR 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 TMP303EDRLR reliable?
The price and inventory of TMP303EDRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP303EDRLR is usually 5 days.
3.What payment methods are accepted for TMP303EDRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP303EDRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP303EDRLR?
TMP303EDRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP303EDRLR 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 TMP303EDRLR?
For technical support, including TMP303EDRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP303EDRLR requirements.
6.How does Aetrix verify that TMP303EDRLR is sourced from the original manufacturer or authorized distributors?
All TMP303EDRLR 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 TMP303EDRLR meets industry standards.
7.What is the process for return or replacement of TMP303EDRLR?
All TMP303EDRLR units undergo pre-shipment inspection (PSI). If there is an issue with TMP303EDRLR, 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 TMP303EDRLR part is unused and in its original packaging.
Return procedure for TMP303EDRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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