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Texas Instruments SM72480SDX-120/NOPB
- Part No.:
- SM72480SDX-120/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
SM72480SDX-120/NOPB.pdf
- Description:
- THERMOSTAT 120DEGC OPN DRN 6WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM72480SDX-120/NOPB from Texas Instruments is a factory-preset, dual-output temperature monitoring IC featuring a 120°C overtemperature switch with 4.5–5.5°C hysteresis and a linear analog VTEMP sensor output (−10.3 mV/°C). It operates from 1.6V to 5.5V, draws only 8 μA typical supply current, and delivers ±2.2°C trip accuracy and ±2.3°C VTEMP accuracy across −50°C to +150°C - deployed in photovoltaic power optimizers for thermal runaway protection.
For engineers reviewing the SM72480SDX-120/NOPB datasheet, SM72480SDX-120/NOPB pinout, SM72480SDX-120/NOPB application, or SM72480SDX-120/NOPB equivalent, key selection considerations include its WSON-6 package thermal pad integration, push-pull + open-drain dual digital outputs, TRIP TEST pin for in-situ verification, and VTEMP short-circuit protection enabling direct ADC interfacing without external buffering.
Technical Context
The SM72480SDX-120/NOPB integrates a precision bandgap-based temperature sensor core with two independent output paths: one digital path drives both OVERTEMP (push-pull, active-high) and OVERTEMP (open-drain, active-low) simultaneously upon die temperature exceeding 120°C; the other analog path delivers a monotonic, NTC-derived VTEMP voltage referenced to GND with rail-to-rail drive capability (±100 μA).
Its TRIP TEST input enables functional validation at any temperature by forcing digital outputs high and routing VTRIP to VTEMP - eliminating need for thermal chamber cycling. Internal hysteresis prevents chatter near trip point, while supply-noise rejection (>82 dB) and 1100 pF capacitive load tolerance ensure robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Trip Point | Factory-set at 120°C ±125°C; triggers thermal shutdown before semiconductor damage in PV optimizer MOSFETs. |
| Hysteresis | 4.5°C to 5.5°C; ensures stable switching without oscillation during slow thermal transients. |
| VTEMP Output Slope | −10.3 mV/°C; enables direct linear temperature calculation using VTEMP = 2119 − 10.36 × TDIE (mV). |
| Supply Voltage Range | 1.6V to 5.5V; supports low-voltage 1.8V system designs and legacy 3.3V/5V rails without level-shifting. |
| Quiescent Current | 8 μA typical; extends battery life in wireless transceiver thermal monitors and enables always-on sensing. |
| VTEMP Accuracy | ±2.3°C over −50°C to +150°C; eliminates calibration overhead in automotive under-hood applications. |
| Digital Output Types | Push-pull (OVERTEMP) + open-drain (OVERTEMP); provides interface flexibility with MCU GPIOs or logic families. |
Pinout & Package
SM72480SDX-120/NOPB uses a 2.2 mm × 2.5 mm WSON-6 package (TI package code SDB06A) with exposed die attach pad (DAP) for enhanced thermal conduction to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - TRIP TEST | Digital input | Active-high test enable: forces digital outputs asserted and routes VTRIP to VTEMP for in-circuit verification. |
| 2 - VDD | Positive supply | 1.6V–5.5V input; powers internal sensor, comparators, and output drivers. |
| 3 - OVERTEMP | Digital output | Active-low, open-drain; requires external pull-up; asserts when TDIE ≥ 120°C or TRIP TEST = 1. |
| 4 - GND | Power ground | Reference node for all analog/digital circuitry; DAP must be soldered to PCB thermal pad tied to this pin. |
| 5 - OVERTEMP | Digital output | Active-high, push-pull; asserts when TDIE ≥ 120°C or TRIP TEST = 1; no external components required. |
| 6 - VTEMP | Analog output | Linear NTC voltage (−10.3 mV/°C); sinks/sources ±100 μA; short-circuit protected; drives ADC inputs directly. |
Key Features
| Feature | Design Value |
|---|---|
| Latching overtemperature detection | Once triggered, outputs remain asserted until temperature falls below (120°C − hysteresis), preventing intermittent faults in safety-critical systems. |
| Dual digital output topology | Simultaneous push-pull and open-drain outputs eliminate need for external inverters or level shifters in mixed-voltage systems. |
| VTEMP short-circuit protection | Enables robust interfacing with sampling ADCs without risk of latch-up or output damage during transient overload. |
| TRIP TEST pin for in-situ validation | Allows full functional test of thermal protection circuitry at room temperature - no thermal cycling required during production test. |
| High supply-noise rejection | 82 dB attenuation of VDD noise on VTEMP output ensures accurate readings in electrically noisy PV string environments. |
Applications
| PV Power Optimizers | Wireless Transceivers |
|---|---|
Use Scenario: Mounted on MOSFET heatsink inside solar panel-level DC-DC converter to monitor junction temperature during partial shading or hot-spot conditions. IC Role / Device Role / Timing Role: Dual-role thermal protector and sensor: OVERTEMP signals microcontroller to reduce duty cycle; VTEMP feeds closed-loop thermal derating algorithm. Use Value: Prevents irreversible MOSFET failure by triggering shutdown at precisely 120°C with 5°C hysteresis, while VTEMP enables predictive thermal throttling before trip. | Use Scenario: Integrated into battery-powered LoRaWAN node to monitor RF PA temperature during transmission bursts. IC Role / Device Role / Timing Role: Low-power thermal watchdog: TRIP TEST validates functionality at startup; VTEMP sampled every 10s to detect abnormal heating trends. Use Value: 8 μA quiescent current extends multi-year battery life; ±2.3°C VTEMP accuracy enables reliable thermal trend analysis without periodic recalibration. |
| Battery Management Systems | Automotive Under-Hood Electronics |
Use Scenario: Embedded in 12V lead-acid battery charger module to prevent thermal runaway during fast-charge cycles. IC Role / Device Role / Timing Role: Overtemperature switch: OVERTEMP drives charge controller disable signal; VTEMP provides real-time cell temperature feedback to charging algorithm. Use Value: Factory-trimmed 120°C trip point matches battery thermal failure threshold; VTEMP linearity (−10.3 mV/°C) simplifies firmware temperature computation. | Use Scenario: Mounted on engine control unit (ECU) power stage to monitor gate driver IC temperature in stop-start applications. IC Role / Device Role / Timing Role: Safety-critical thermal monitor: OVERTEMP asserts hardware reset to MCU; VTEMP feeds diagnostic CAN message for service tools. Use Value: −50°C to +150°C operating range covers full automotive ambient and junction extremes; 152°C/W θJA enables accurate die temperature estimation via self-heating compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch and sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM50 | Single-output, 130°C fixed trip, no analog VTEMP output; 10 μA supply current; SOIC-8 package. | Lacks dual digital outputs and precision analog sensor - suitable only for basic overtemperature cutoff, not closed-loop thermal management. | Select LM50 only if application requires simple shutdown without temperature telemetry or output flexibility. |
| MAX6505 | 125°C trip, open-drain only output, no TRIP TEST pin, ±3°C trip accuracy, SOT23-5 package. | No push-pull output or VTEMP sensor; lower accuracy limits use in precision thermal regulation; smaller footprint but no thermal pad. | Choose MAX6505 for space-constrained cost-sensitive designs where only basic overtemperature flag is needed. |
Compared with LM50 and MAX6505, SM72480SDX-120/NOPB uniquely combines factory-trimmed 120°C trip, dual digital outputs, and a linear analog sensor in a thermally optimized WSON-6 package - making it the only option supporting both safety shutdown and real-time thermal analytics in a single device.
Availability
SM72480SDX-120/NOPB is available at Aetrix Electronics and suitable for PV power optimizers, wireless transceivers, battery management systems, and automotive under-hood electronics requiring stable component supply and long-term thermal reliability.
Supply support for SM72480SDX-120/NOPB 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 leader specializing in analog, embedded processing, and high-reliability silicon solutions for industrial, automotive, and renewable energy markets.
The SM72480 product line delivers integrated temperature monitoring ICs engineered specifically for photovoltaic power optimization and high-temperature industrial sensing - combining precision analog sensing with robust digital fault signaling in ultra-small packages.
FAQ
What is the exact factory-set temperature trip point for SM72480SDX-120/NOPB?
The SM72480SDX-120/NOPB has a factory-preset temperature trip point of 120°C, with guaranteed accuracy of ±2.2°C across −50°C to +150°C operating range. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The '120' in the part number explicitly denotes this fixed trip point, distinguishing it from variants like SM72480SDX-105/NOPB (105°C) or SM72480SDX-125/NOPB (125°C).
How does the TRIP TEST pin function on SM72480SDX-120/NOPB?
Driving the TRIP TEST pin high (≥VDD −0.5V) forces both OVERTEMP and OVERTEMP digital outputs to assert regardless of actual die temperature, while routing the VTRIP voltage (corresponding to 120°C) to the VTEMP pin. This enables full functional verification of the thermal protection circuit during production test or field diagnostics without requiring thermal chamber exposure - a critical capability for SM72480SDX-120/NOPB deployment in inaccessible PV optimizer modules.
Can SM72480SDX-120/NOPB drive an ADC input directly without external buffering?
Yes, SM72480SDX-120/NOPB can drive most SAR and delta-sigma ADC inputs directly. Its VTEMP output provides ±100 μA drive strength and is short-circuit protected, enabling reliable charging of typical ADC sample-and-hold capacitors (≤1100 pF). The datasheet confirms stable operation up to 1100 pF capacitive load - eliminating need for op-amp buffers in most implementations and reducing BOM cost and board area for SM72480SDX-120/NOPB-based designs.
What is the purpose of the DAP (Die Attach Pad) on SM72480SDX-120/NOPB?
The DAP on SM72480SDX-120/NOPB is an exposed thermal pad on the underside of the WSON-6 package that must be soldered to a PCB thermal pad connected to GND. This provides the primary thermal conduction path from die to PCB, reducing θJA to 152°C/W and ensuring accurate die temperature measurement. Leaving the DAP unconnected degrades thermal response and introduces measurement error - a mandatory design requirement for proper SM72480SDX-120/NOPB operation in thermal protection applications.
Does SM72480SDX-120/NOPB require external pull-up resistors on its digital outputs?
Only the OVERTEMP (pin 3) open-drain output requires an external pull-up resistor to VDD; typical value is 100 kΩ for 3.3V systems. The OVERTEMP (pin 5) push-pull output does not require external components. Pull-up resistor value must be calculated based on VOL (0.2V max), VDD(max), and sink current (385 μA max) per TI's application guidance - incorrect sizing risks false triggering or slow rise times in SM72480SDX-120/NOPB systems.
SM72480SDX-120/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SolarMagic™
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 120°C
- Accuracy:
- ±2.2°C
- Current - Output (Max):
- 7mA
- Output Type:
- Open Drain, Push-Pull
- Output:
- Active High, Active Low
- Output Function:
- OverTemp, /OverTemp
- Selectable Hysteresis:
- No
- Features:
- -
- Voltage - Supply:
- 1.6 V ~ 5.5 V
- Current - Supply:
- 8µA
- Operating Temperature:
- -50°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 6-WSON (2.2x2.5)
SM72480SDX-120/NOPB FAQ
1.How can I place an order for SM72480SDX-120/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72480SDX-120/NOPB 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 SM72480SDX-120/NOPB reliable?
The price and inventory of SM72480SDX-120/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72480SDX-120/NOPB is usually 5 days.
3.What payment methods are accepted for SM72480SDX-120/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72480SDX-120/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72480SDX-120/NOPB?
SM72480SDX-120/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72480SDX-120/NOPB 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 SM72480SDX-120/NOPB?
For technical support, including SM72480SDX-120/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72480SDX-120/NOPB requirements.
6.How does Aetrix verify that SM72480SDX-120/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72480SDX-120/NOPB 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 SM72480SDX-120/NOPB meets industry standards.
7.What is the process for return or replacement of SM72480SDX-120/NOPB?
All SM72480SDX-120/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72480SDX-120/NOPB, 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 SM72480SDX-120/NOPB part is unused and in its original packaging.
Return procedure for SM72480SDX-120/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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