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Texas Instruments TMP390A3DRLT
- Part No.:
- TMP390A3DRLT
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TMP390A3DRLT.pdf
- Description:
- THERMOSTAT PROG ACT LOW OPEN DRN
- Quantity:
- Payment:
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Product details
Overview
TMP390A3DRLT from Texas Instruments is an ultra-low-power, dual-channel resistor-programmable temperature switch providing independent overtemperature (hot) and undertemperature (cold) detection with ±3.5°C accuracy across −55°C to +130°C, 0.5 µA typical quiescent current at 25°C, and open-drain outputs in a 1.60 mm × 1.20 mm SOT-563 package - used for thermal protection in DC/DC converters and wireless infrastructure RRU units.
For engineers reviewing the TMP390A3DRLT datasheet, TMP390A3DRLT pinout, TMP390A3DRLT application, or TMP390A3DRLT equivalent, this page delivers verified trip point programming ranges (SETA: 1.05–909 kΩ; SETB: 10.5–909 kΩ), hysteresis options (5°C/10°C/20°C), A3-level accuracy specification, open-drain output behavior, and trip test functionality for in-system manufacturing validation.
Technical Context
The TMP390A3DRLT implements two independent analog temperature sensing channels with resistor-programmed thresholds: Channel A (hot) supports +30°C to +124°C in 2°C steps via SETA; Channel B (cold) supports −50°C to +25°C in 5°C steps via SETB. Hysteresis is selected per channel using E96-series resistors - 5°C or 10°C for both channels, or 20°C for Channel A only when SETB is grounded.
It operates from 1.62 V to 5.5 V, consumes 0.5 µA average quiescent current, features internal power-on reset at 1.5 V, and updates outputs every 0.5 s with 0.65 ms conversion time. The device supports board-level trip testing by asserting logic high on SETA or SETB to force corresponding output low without thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy (A3 Level) | ±3.5°C over −55°C to +130°C; ±2.0°C from 0°C to +70°C - defines maximum allowable trip error in full industrial range. |
| Quiescent Current | 0.5 µA typical at 25°C - enables multi-year battery operation in always-on thermal monitoring nodes. |
| Supply Voltage Range | 1.62 V to 5.5 V - supports direct interface with Li-ion, 3.3 V, and 5 V system rails without LDO. |
| Channel A Trip Range | +30°C to +124°C in 2°C increments - programmable via 1% E96 resistor (1.05–909 kΩ) on SETA pin. |
| Channel B Trip Range | −50°C to +25°C in 5°C increments - programmable via 1% E96 resistor (10.5–909 kΩ) on SETB pin. |
| Hysteresis Options | 5°C or 10°C for both channels; 20°C for Channel A only when SETB = GND - prevents output chatter near trip points. |
| Output Type | Open-drain (OUTA/OUTB) - allows flexible pull-up to VDDIO ≤ VDD + 0.3 V for MCU voltage level translation. |
Pinout & Package
Package: SOT-563 (6-pin), 1.60 mm × 1.20 mm body size, surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SETA | Input | Resistor-programmed hot trip point; connects to 1% E96 resistor (1.05–909 kΩ) to GND; determines Channel A threshold and hysteresis. |
| 2 - SETB | Input | Resistor-programmed cold trip point and hysteresis selector; connects to 1% E96 resistor (10.5–909 kΩ) to GND; sets Channel B threshold and shared hysteresis. |
| 3 - GND | Ground | Reference node for internal circuitry and external resistor connections; must be low-impedance. |
| 4 - OUTB | Logic Output | Open-drain active-low output for cold detection; requires external pull-up; floats or grounds if unused. |
| 5 - VDD | Supply | Primary power input (1.62–5.5 V); powers internal bandgap, ADC, and logic; bypass with 0.1 µF capacitor. |
| 6 - OUTA | Logic Output | Open-drain active-low output for hot detection; requires external pull-up; floats or grounds if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable trip points | Eliminates need for factory calibration; 1% resistor tolerance contributes zero error to trip accuracy. |
| Dual independent thermal channels | Enables simultaneous overtemperature shutdown and undertemperature warning in single IC footprint. |
| Configurable hysteresis (5°C/10°C/20°C) | Prevents output oscillation during slow thermal transients; 20°C option available for Channel A only. |
| Integrated trip test function | Allows in-system functional verification of OUTA/OUTB without thermal chamber - reduces test cost and time. |
| Ultra-low 0.5 µA quiescent current | Extends battery life in portable tools, power banks, and remote sensors where continuous monitoring is required. |
Applications
| DC/DC Converter Thermal Protection | Wireless Infrastructure RRU Monitoring |
|---|---|
|
Use Scenario: Monitors heatsink temperature in high-efficiency isolated DC/DC converters to prevent MOSFET overheating during sustained load. IC Role / Device Role / Timing Role: Dual-channel switch triggers fan control (OUTA) and initiates graceful shutdown (OUTB) when core temperature exceeds safe limits. Use Value: Enables compact, low-power thermal management without microcontroller intervention - reduces BOM count and firmware complexity. |
Use Scenario: Detects ambient and baseband IC temperature in macro remote radio units deployed outdoors across wide climatic ranges. IC Role / Device Role / Timing Role: Channel A (hot) guards against RF amplifier thermal runaway; Channel B (cold) ensures PLL stability below −25°C. Use Value: Supports extended operating range (−50°C to +130°C) and eliminates calibration drift - critical for unattended telecom deployments. |
| Power Tool Battery Pack Safety | Environmental Control System (ECS) Thresholding |
|
Use Scenario: Embedded in cordless power tool battery packs to halt charging/discharging when cell temperature exceeds safe thresholds. IC Role / Device Role / Timing Role: Resistor-programmed hot/cold trip points provide precise, field-adjustable protection aligned with Li-ion chemistry requirements. Use Value: Prevents thermal runaway while enabling consistent performance across production batches - no laser trimming or EEPROM needed. |
Use Scenario: Controls HVAC actuator sequencing in commercial building ECS based on duct or room temperature thresholds. IC Role / Device Role / Timing Role: Provides discrete ON/OFF signals to PLC inputs for zone-specific heating/cooling activation with hysteresis to avoid relay chatter. Use Value: Delivers deterministic, low-latency switching (0.65 ms conversion) with minimal power draw - ideal for energy-conscious building automation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMP392A3DRLT | Hot/Warm dual-channel configuration; no cold-trip capability; same A3 accuracy and 0.5 µA IQ. | Limited to overtemperature + intermediate threshold detection; cannot replace cold-trip requirement in ECS or battery systems. | Select TMP392A3DRLT only when dual hot thresholds (e.g., warning + shutdown) are needed instead of hot/cold pair. |
| TMP302DAIYFDR | Single-channel, fixed-threshold (−25°C) temperature switch; 0.7 µA IQ; SOT-563 package. | Lacks resistor programming, hysteresis selection, and dual-channel flexibility; requires separate devices for hot/cold. | Choose TMP302DAIYFDR only for cost-sensitive, single-threshold applications where design margin allows fixed-point detection. |
Compared with TMP390A3DRLT, TMP392A3DRLT offers identical power and accuracy but omits cold-trip functionality, while TMP302DAIYFDR trades programmability and dual-channel capability for lower unit cost and simpler layout - neither provides drop-in replacement capability.
Availability
TMP390A3DRLT is available at Aetrix Electronics and suitable for DC/DC converter thermal protection, wireless infrastructure RRU monitoring, and power tool battery pack safety requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production lots.
Supply support for TMP390A3DRLT 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 TMP390A3DRLT belongs to TI's ultra-low-power temperature switch product line, designed specifically for thermal event detection and protection in space-constrained, battery-operated, and high-reliability systems across industrial, telecom, and consumer applications.
FAQ
What is the trip temperature resolution of the TMP390A3DRLT?
The TMP390A3DRLT provides +30°C to +124°C trip points for Channel A in precise 2°C steps, and −50°C to +25°C for Channel B in 5°C steps - all determined by standard E96 1% resistor values on SETA and SETB pins. This resolution enables fine-grained thermal policy implementation without firmware or digital calibration. The TMP390A3DRLT achieves this through internal resistor ladder decoding and factory-trimmed reference circuitry.
How does hysteresis work on the TMP390A3DRLT?
Hysteresis on the TMP390A3DRLT is set by the resistor value on SETB: 5°C or 10°C applies to both channels, while grounding SETB configures 20°C hysteresis exclusively for Channel A. This prevents output toggling during slow thermal transitions near trip thresholds. The TMP390A3DRLT implements hysteresis digitally within its comparator logic - no external components required beyond the SET resistors.
Can the TMP390A3DRLT operate from a 1.8-V supply?
Yes, the TMP390A3DRLT supports supply voltages from 1.62 V to 5.5 V, making it fully compatible with 1.8-V systems. Its power-on reset activates at 1.5 V, and all specifications - including ±3.5°C accuracy and 0.5 µA quiescent current - are guaranteed across this range. The TMP390A3DRLT maintains stable operation down to 1.62 V without brownout or functional degradation.
What is the purpose of the trip test function on the TMP390A3DRLT?
The trip test function allows forcing OUTA or OUTB low by applying logic-high voltage (>0.8 × VDD) to SETA or SETB during manufacturing - verifying output connectivity and pull-up integrity without thermal cycling. This reduces test time and equipment cost. The TMP390A3DRLT returns to normal thermal monitoring immediately after test signal removal, with no impact on trip point settings.
Is the TMP390A3DRLT pin-compatible with other devices in the TMP39x family?
No - the TMP390A3DRLT shares the SOT-563 package and pinout with TMP392A3DRLT, but differs functionally: TMP392 supports Hot/Warm channels, not Hot/Cold. Pin compatibility exists only between TMP390 and TMP392 variants (e.g., TMP390A3DRLT ↔ TMP392A3DRLT), but software and resistor programming must be redesigned for functional equivalence. The TMP390A3DRLT is not pin-compatible with fixed-threshold switches like TMP302.
TMP390A3DRLT 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:
- Cold, Hot
- Switching Temperature:
- Programmable
- Accuracy:
- ±3.5°C
- Current - Output (Max):
- -
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- OverTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Trip Point
- Voltage - Supply:
- 1.62 V ~ 5.5 V
- Current - Supply:
- 500nA
- Operating Temperature:
- -55°C ~ 130°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
TMP390A3DRLT FAQ
1.How can I place an order for TMP390A3DRLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP390A3DRLT 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 TMP390A3DRLT reliable?
The price and inventory of TMP390A3DRLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP390A3DRLT is usually 5 days.
3.What payment methods are accepted for TMP390A3DRLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP390A3DRLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP390A3DRLT?
TMP390A3DRLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP390A3DRLT 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 TMP390A3DRLT?
For technical support, including TMP390A3DRLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP390A3DRLT requirements.
6.How does Aetrix verify that TMP390A3DRLT is sourced from the original manufacturer or authorized distributors?
All TMP390A3DRLT 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 TMP390A3DRLT meets industry standards.
7.What is the process for return or replacement of TMP390A3DRLT?
All TMP390A3DRLT units undergo pre-shipment inspection (PSI). If there is an issue with TMP390A3DRLT, 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 TMP390A3DRLT part is unused and in its original packaging.
Return procedure for TMP390A3DRLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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