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Texas Instruments SM72480SDX-125/NOPB
- Part No.:
- SM72480SDX-125/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
SM72480SDX-125/NOPB.pdf
- Description:
- THERMOSTAT 125DEGC OPN DRN 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,035
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Product details
Overview
SM72480SDX-125/NOPB from Texas Instruments is a factory-preset, dual-output temperature monitoring IC combining a latching overtemperature switch and a linear analog temperature sensor in a single WSON-6 package. It features a 125°C trip point (±2.2°C accuracy), 4.5–5.5°C hysteresis, 1.6V minimum supply operation, and delivers ±100 µA VTEMP drive capability - enabling direct ADC interfacing in photovoltaic power optimizers and battery management systems.
For engineers reviewing the SM72480SDX-125/NOPB datasheet, SM72480SDX-125/NOPB pinout, SM72480SDX-125/NOPB application, or SM72480SDX-125/NOPB equivalent, this page provides verified functional specifications, validated pin roles, confirmed thermal accuracy across −50°C to +150°C, and real-world design guidance for PV optimizer thermal protection and analog temperature sensing.
Technical Context
The SM72480SDX-125/NOPB integrates two independent digital outputs - an active-high push-pull OVERTEMP and an active-low open-drain OVERTEMP - both asserting simultaneously at die temperature ≥125°C with built-in latching behavior. Its analog VTEMP output exhibits a −10.3 mV/°C slope (for 125°C trip variant) and is short-circuit protected.
TRIP TEST input enables in-situ verification: driving it high forces both digital outputs active and routes the precise VTRIP voltage (≈873 mV at 125°C) to VTEMP, allowing system-level calibration without thermal cycling. The device operates from 1.6V to 5.5V with only 8 µA quiescent current and rejects supply noise up to 82 dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Trip Point | Factory-set to 125°C ±2.2°C - ensures reliable overtemperature shutdown in PV module electronics before critical thermal derating. |
| Hysteresis | 4.5°C to 5.5°C - prevents output oscillation during slow thermal transients near trip threshold. |
| VTEMP Output Slope | −10.3 mV/°C (125°C trip variant) - enables direct linear temperature calculation from measured voltage without lookup tables. |
| Supply Voltage Range | 1.6V to 5.5V - supports low-voltage 1.8V microcontroller interfaces and wide-input industrial rails. |
| VTEMP Drive Capability | ±100 µA - sufficient to charge typical SAR ADC input capacitors rapidly without external buffering. |
| Quiescent Current | 8 µA (typ) - enables always-on thermal monitoring in energy-constrained solar optimizer nodes. |
| Operating Temperature | −50°C to +150°C - qualified for under-hood automotive, outdoor PV, and high-temp industrial environments. |
Pinout & Package
SM72480SDX-125/NOPB uses a 2.2 mm × 2.5 mm WSON-6 package (TI package code SDB06A) with exposed thermal pad (DAP) for enhanced PCB heat transfer. DAP must be soldered to GND-connected thermal pad for optimal thermal response and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - TRIP TEST | Digital input | Active-high test enable: forces digital outputs active and routes VTRIP to VTEMP for in-system verification. |
| 2 - VDD | Power supply | Positive supply input (1.6V–5.5V); powers internal circuitry and defines logic thresholds. |
| 3 - OVERTEMP | Digital output | Active-low open-drain output; requires external pull-up resistor; asserts when TDIE ≥125°C. |
| 4 - GND | Ground reference | Primary ground return; DAP should be connected directly to this node for best noise immunity. |
| 5 - OVERTEMP | Digital output | Active-high push-pull output; asserts when TDIE ≥125°C; no external components required. |
| 6 - VTEMP | Analog output | Linear NTC voltage output (−10.3 mV/°C); short-circuit protected; drives ±100 µA into ADC inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Latching overtemperature function | Prevents intermittent tripping during thermal instability; requires manual reset via power cycle or TRIP TEST deassertion. |
| Dual digital output types | Simultaneous push-pull (OVERTEMP) and open-drain (OVERTEMP) outputs provide interface flexibility for diverse host controller input requirements. |
| VTEMP short-circuit protection | Enables robust operation in noisy or fault-prone environments where accidental VTEMP-to-GND shorts may occur. |
| TRIP TEST in-situ verification | Eliminates need for thermal chamber testing: digital outputs and trip voltage become accessible electrically at any ambient temperature. |
| High supply-noise rejection | 82 dB attenuation of VDD ripple on VTEMP output - maintains analog accuracy even with switching regulator supplies. |
Applications
| PV Power Optimizer Thermal Protection | Battery Management System Monitoring |
|---|---|
Use Scenario: Monitors MOSFET junction temperature in distributed PV DC optimizers to prevent thermal runaway during partial shading or mismatch conditions. IC Role / Device Role / Timing Role: Dual-role thermal monitor: digital outputs trigger immediate shutdown; VTEMP provides continuous temperature telemetry to MCU for predictive derating. Use Value: Factory-trimmed 125°C trip point ensures consistent protection across production units without calibration; 8 µA supply current minimizes impact on optimizer efficiency. |
Use Scenario: Tracks cell temperature in multi-cell Li-ion battery packs to enforce charge/discharge limits and prevent thermal excursion during fast charging. IC Role / Device Role / Timing Role: Analog temperature sensor feeding ADC; digital outputs serve as hardware safety cutoffs independent of firmware execution. Use Value: −10.3 mV/°C VTEMP slope enables accurate linear interpolation; ±2.2°C trip accuracy meets IEC 62133 thermal safety requirements. |
| Automotive Under-Hood Electronics | Industrial Motor Drive Thermal Sensing |
Use Scenario: Protects engine control unit (ECU) power stages and gate drivers from overheating in high-ambient under-hood environments. IC Role / Device Role / Timing Role: Overtemperature switch with latching behavior ensures fail-safe shutdown; VTEMP feeds diagnostic logging subsystem. Use Value: −50°C to +150°C operating range covers full automotive AEC-Q100 Grade 1 envelope; 1.6V min supply supports low-power sleep modes. |
Use Scenario: Monitors IGBT/module heatsink temperature in servo and variable-frequency drives to prevent thermal stress-induced failure. IC Role / Device Role / Timing Role: Primary thermal sensor providing both analog feedback for closed-loop thermal management and hardwired safety cutoff. Use Value: 4.5–5.5°C hysteresis eliminates chatter during PWM-induced thermal ripple; WSON-6 footprint enables compact placement near hot components. |
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 |
|---|---|---|---|
| LM75BIMM/NOPB | Non-latching 75°C trip, I²C interface, no analog output - lacks VTEMP and latching functionality. | Suitable for basic SMBus-based thermal alerting, not for analog telemetry or safety-critical latch-on-overtemp. | Select if digital bus integration is required and analog output/latching are unnecessary. |
| MAX6577KSA+T | Single-output, frequency-based temperature sensor (1 kHz/°C), no digital switch outputs - requires external logic for overtemp action. | Fits cost-sensitive consumer applications needing only temperature readback, not hardware-triggered shutdown. | Choose when system already includes microcontroller-based decision logic and analog voltage output is not needed. |
Compared with LM75BIMM/NOPB and MAX6577KSA+T, the SM72480SDX-125/NOPB uniquely combines factory-trimmed 125°C latching shutdown, dual digital output topologies, and a precision analog voltage output - making it irreplaceable in PV optimizer and battery safety architectures requiring both hardware-enforced protection and continuous thermal telemetry.
Availability
SM72480SDX-125/NOPB is available at Aetrix Electronics and suitable for PV power optimizers, battery management systems, and automotive under-hood electronics requiring stable component supply, long-term lifecycle support, and guaranteed thermal accuracy.
Supply support for SM72480SDX-125/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 SM72480SDX-125/NOPB belongs to TI's SolarMagic™ family - engineered specifically for photovoltaic system optimization, with emphasis on precision thermal monitoring, ultra-low power consumption, and robust operation in harsh environmental conditions.
FAQ
What is the exact factory-set temperature trip point for SM72480SDX-125/NOPB?
The SM72480SDX-125/NOPB has a factory-preset temperature trip point of 125°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. The '125' in the part number explicitly denotes this 125°C trip configuration, distinguishing it from 105°C or 120°C variants of the SM72480 family.
Does SM72480SDX-125/NOPB require external components for basic operation?
No external components are required for core functionality of the SM72480SDX-125/NOPB. The push-pull OVERTEMP output operates standalone, while the open-drain OVERTEMP output needs only an external pull-up resistor if used. VTEMP drives ±100 µA directly, supporting direct connection to most ADC inputs. A 0.1 µF bypass capacitor on VDD is recommended but not mandatory for stable operation.
How does the TRIP TEST pin function in SM72480SDX-125/NOPB?
Driving the TRIP TEST pin high on the SM72480SDX-125/NOPB forces both OVERTEMP outputs active regardless of actual die temperature and routes the precise VTRIP voltage (e.g., ~873 mV at 125°C) to the VTEMP pin. This enables full electrical verification of the digital path and trip-point accuracy without thermal cycling - a key feature for production test and field diagnostics.
What is the thermal performance impact of the WSON-6 package on SM72480SDX-125/NOPB accuracy?
The SM72480SDX-125/NOPB's WSON-6 package (θJA = 152°C/W) achieves accurate die temperature measurement only when its DAP is soldered to a GND-connected thermal pad on the PCB. Leaving DAP floating increases thermal resistance and introduces measurement lag; connecting DAP directly to pin 4 (GND) minimizes self-heating error to <0.06°C under typical load conditions.
Can SM72480SDX-125/NOPB operate reliably from a 1.8V supply?
Yes - the SM72480SDX-125/NOPB is fully specified down to 1.6V supply voltage. At 1.8V, it maintains all key specifications: 125°C trip accuracy (±2.2°C), 8 µA quiescent current, −10.3 mV/°C VTEMP slope, and valid logic levels on TRIP TEST and digital outputs. This makes it ideal for modern low-voltage microcontroller domains where 1.8V rails are common.
SM72480SDX-125/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:
- 125°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-125/NOPB FAQ
1.How can I place an order for SM72480SDX-125/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72480SDX-125/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-125/NOPB reliable?
The price and inventory of SM72480SDX-125/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-125/NOPB is usually 5 days.
3.What payment methods are accepted for SM72480SDX-125/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72480SDX-125/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72480SDX-125/NOPB?
SM72480SDX-125/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72480SDX-125/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-125/NOPB?
For technical support, including SM72480SDX-125/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72480SDX-125/NOPB requirements.
6.How does Aetrix verify that SM72480SDX-125/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72480SDX-125/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-125/NOPB meets industry standards.
7.What is the process for return or replacement of SM72480SDX-125/NOPB?
All SM72480SDX-125/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72480SDX-125/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-125/NOPB part is unused and in its original packaging.
Return procedure for SM72480SDX-125/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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