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Texas Instruments TMP303EDRLT
- Part No.:
- TMP303EDRLT
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TMP303EDRLT.pdf
- Description:
- THERMOSTAT 70DEG ACT HI SOT563-6
- Quantity:
- Payment:
- Shipping:
Inventory:433
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Product details
Overview
TMP303EDRLT from Texas Instruments is a factory-programmed temperature switch with fixed low/high trip points (TL = 0°C, TH = 70°C), ±0.2°C typical accuracy over –20°C to 60°C, 5 μA maximum quiescent current, and push-pull active-high output - used for battery thermal protection and wireless heat detection in ultra-low-power systems.
For engineers reviewing the TMP303EDRLT datasheet, TMP303EDRLT pinout, TMP303EDRLT application, or TMP303EDRLT equivalent, key selection criteria include factory-set trip window (0°C/70°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 TMP303EDRLT implements a comparator-based thermal sensing architecture with internal ADC-derived temperature measurement, fixed trip thresholds set at wafer level, and digital hysteresis control via two dedicated input pins (HYSTSET0/HYSTSET1). It operates without external components beyond a 0.1-μF bypass capacitor.
Its functional mode is strictly single-state: power-on reset asserts OUT high for ≤35 ms, then transitions based on real-time comparison of measured temperature against TL/TH boundaries and configured hysteresis. The SOH pin provides deterministic override capability independent of thermal state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.4 V to 3.6 V - enables direct operation from coin-cell (3 V) or single Li-ion (3.0–3.6 V) without regulation. |
| Quiescent Current | 4 μA to 8 μA (–40°C to 125°C) - supports >10-year battery life in wireless sensor nodes. |
| Accuracy (Typ) | ±0.2°C from –20°C to 60°C - ensures precise thermal boundary enforcement for safety-critical shutdowns. |
| Hysteresis Options | 1°C / 2°C / 5°C / 10°C - selected by HYSTSET0/HYSTSET1 logic levels; prevents output chatter near trip points. |
| Output Type | Push-pull, active-high - eliminates need for external pull-up resistor; drives fan or MCU GPIO directly. |
| Operating Range | –40°C to 125°C - supports industrial ambient and internal PCB hot-spot monitoring. |
| Power-Up Delay | 20 ms to 35 ms - defines minimum system response latency after supply stabilization. |
Pinout & Package
SOT-563 (DRL) package: 1.60 mm × 1.20 mm × 0.6 mm body size, 6-pin surface-mount micropackage optimized for space-constrained portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HYSTSET0 | Digital input | Configures hysteresis magnitude (with HYSTSET1); tied to GND or VS to select 1/2/5/10°C window. |
| GND | Ground reference | Return path for supply and internal circuitry; requires low-impedance PCB ground plane coupling. |
| OUT | Digital output | Active-high push-pull signal; asserts high when temperature exceeds TH or falls below TL, per hysteresis setting. |
| SOH | Digital input | Set Output High override; forces OUT high regardless of temperature when pulled high (internal 100-kΩ pulldown). |
| VS | Power supply | Single 1.4–3.6 V input; bypassed with 0.1-μF ceramic capacitor placed adjacent to VS/GND pins. |
| HYSTSET1 | Digital input | Second hysteresis control bit; combined with HYSTSET0 to define full hysteresis selection matrix. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trip programming | Trip points TL = 0°C / TH = 70°C permanently laser-trimmed - eliminates field calibration and reduces BOM count. |
| Ultra-low power | 5 μA max quiescent current - enables multi-year operation on CR2032 coin cell in wireless thermal alarms. |
| No external components | Operates with only 0.1-μF bypass capacitor - reduces layout complexity and improves reliability in high-vibration environments. |
| SOH test enable | Dedicated pin forces OUT high for end-of-line functional test without thermal chamber cycling. |
| Push-pull output | Drives loads up to 1 mA without pull-up - simplifies interface to microcontroller GPIO or discrete MOSFET gate. |
Applications
| Battery Thermal Protection | Wireless Heat Detector |
|---|---|
|
Use Scenario: Monitoring lithium-ion battery pack temperature during charging/discharging in portable medical devices. IC Role / Device Role / Timing Role: Temperature switch asserting fault signal when cell temperature exceeds 70°C (TH), with 5°C hysteresis preventing false resets during transient heating. Use Value: Prevents thermal runaway by triggering charger disable or system shutdown before critical threshold is breached. |
Use Scenario: Standalone battery-powered fire alarm node mounted on ceiling in historic buildings lacking wired infrastructure. IC Role / Device Role / Timing Role: Fixed-point thermal detector with 0°C/70°C window; wakes MCU only upon sustained overtemperature event. Use Value: Achieves >5-year battery life using 5 μA quiescent current and eliminates wiring labor/cost of conventional smoke detectors. |
| Fan Speed Control | Consumer Electronics Thermal Guard |
|
Use Scenario: Controlling cooling fan in compact set-top box where internal SoC die temperature must stay below 70°C. IC Role / Device Role / Timing Role: Direct fan driver via OUT pin; activates fan at 70°C (TH), deactivates at 65°C (TH – 5°C hysteresis). Use Value: Eliminates need for microcontroller polling or analog thermal feedback loop - reduces firmware overhead and component count. |
Use Scenario: Overtemperature safeguard in USB-C power bank detecting enclosure temperature rise during fast charging. IC Role / Device Role / Timing Role: Trip point monitor asserting interrupt to charge controller IC when case temperature reaches 70°C. Use Value: Meets IEC 62368-1 thermal safety requirements with ±0.2°C accuracy at critical 60–70°C range. |
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, 12 μA quiescent current, SOT-23-5 package. | Lacks hysteresis selection and SOH test pin; requires external pull-up resistor. | Choose when board space allows SOT-23 and system already uses open-drain signaling. |
| LM75BIMM/NOPB | I²C digital temperature sensor with programmable thresholds, 250 μA active current, 8-pin VSSOP. | Requires MCU interaction; not a standalone switch; higher power and larger footprint. | Choose when dynamic threshold adjustment or temperature telemetry is required alongside switching. |
Compared with MAX6505UTP+T and LM75BIMM/NOPB, the TMP303EDRLT delivers lower power, smaller size, and simpler integration for fixed-threshold thermal cutoff - making it optimal for cost-sensitive, battery-operated safety monitors where minimal firmware involvement is preferred.
Availability
TMP303EDRLT is available at Aetrix Electronics and suitable for battery thermal protection, wireless heat detection, and consumer electronics thermal guard applications requiring stable component supply and long-lifecycle support.
Supply support for TMP303EDRLT 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 precision analog, low-power design, and industrial-grade reliability.
The TMP303 product line delivers factory-programmed, ultra-low-power temperature switches for safety-critical thermal monitoring in space- and energy-constrained systems - targeting battery-powered IoT sensors, portable medical devices, and consumer power electronics.
FAQ
What is the factory-set trip temperature range for TMP303EDRLT?
The TMP303EDRLT is factory-programmed with a fixed low trip point (TL) of 0°C and high trip point (TH) of 70°C. These thresholds are laser-trimmed during manufacturing and cannot be altered in the field. This configuration is specific to the "E" variant in the TMP303 family and is documented in TI's SBOS486I datasheet under Device Options.
Does TMP303EDRLT require external components to operate?
No, the TMP303EDRLT functions autonomously with no external resistors, capacitors, or calibration circuitry beyond a recommended 0.1-μF ceramic bypass capacitor on the VS pin. Its integrated temperature sensor, comparator, hysteresis logic, and push-pull output eliminate dependency on microcontrollers or supporting analog circuitry - enabling true "connect-and-go" thermal monitoring.
How is hysteresis configured on TMP303EDRLT?
Hysteresis on the TMP303EDRLT 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=VS, HYSTSET1=GND), 5°C (HYSTSET0=GND, HYSTSET1=VS), or 10°C (both VS). This configuration is static and determines the temperature deadband between trip assertion and release.
What is the role of the SOH pin on TMP303EDRLT?
The SOH (Set Output High) pin on TMP303EDRLT is a dedicated test-enable input with an internal 100-kΩ pulldown resistor. When pulled high, it forces the OUT pin into a high state regardless of measured temperature - allowing hardware-level verification of output connectivity and downstream signal path integrity without thermal cycling. When left floating or grounded, SOH has no effect on normal operation.
Can TMP303EDRLT operate from a 1.5-V alkaline battery?
Yes, TMP303EDRLT supports supply voltages from 1.4 V to 3.6 V, making it fully compatible with single 1.5-V alkaline cells across their discharge curve. Its 5 μA maximum quiescent current ensures minimal voltage droop, and its push-pull output maintains valid logic levels (VOH ≥ VS – 0.4 V, VOL ≤ 0.4 V) even at 1.4 V - enabling reliable interfacing with low-voltage MCUs and logic circuits.
TMP303EDRLT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-563, SOT-666
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
TMP303EDRLT FAQ
1.How can I place an order for TMP303EDRLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP303EDRLT 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 TMP303EDRLT reliable?
The price and inventory of TMP303EDRLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP303EDRLT is usually 5 days.
3.What payment methods are accepted for TMP303EDRLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP303EDRLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP303EDRLT?
TMP303EDRLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP303EDRLT 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 TMP303EDRLT?
For technical support, including TMP303EDRLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP303EDRLT requirements.
6.How does Aetrix verify that TMP303EDRLT is sourced from the original manufacturer or authorized distributors?
All TMP303EDRLT 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 TMP303EDRLT meets industry standards.
7.What is the process for return or replacement of TMP303EDRLT?
All TMP303EDRLT units undergo pre-shipment inspection (PSI). If there is an issue with TMP303EDRLT, 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 TMP303EDRLT part is unused and in its original packaging.
Return procedure for TMP303EDRLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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