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STMicroelectronics SM6HT43A
- Part No.:
- SM6HT43A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6HT43A.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
SM6HT43A from STMicroelectronics is a unidirectional high-temperature Transil™ TVS diode designed for automotive circuit protection, featuring 43 V breakdown voltage (VBR), 59.3 V clamping voltage (VCL) at 28 A IPP, 600 W peak pulse power (10/1000 µs), and ≤10.1 µA leakage current at 150 °C. It operates reliably in engine control units and powertrain modules exposed to harsh thermal environments.
For engineers reviewing the SM6HT43A datasheet, SM6HT43A pinout, SM6HT43A application, or SM6HT43A equivalent, key selection criteria include high-temperature leakage performance (≤10.1 µA @ 150 °C), low clamping factor (VCL/VBR ≈ 1.38), unidirectional polarity, SMB (DO-214AA) package compatibility, and automotive-grade transient suppression capability per ISO 7637-2.
Technical Context
This device uses planar junction technology to achieve stable voltage regulation and low leakage at elevated junction temperatures up to 175 °C. Its unidirectional configuration provides reverse-biased transient clamping with fast response time (<1 ns) and a clamping factor of 1.38 under 10/1000 µs surge conditions.
The SM6HT43A is characterized for operation across -65 °C to +175 °C junction temperature range, with thermal resistance Rth(j-l) = 20 °C/W and Rth(j-a) = 100 °C/W on recommended FR4 PCB layout. It delivers 6 W continuous power dissipation at Tamb = 50 °C and withstands non-repetitive forward surge currents up to 75 A (tp = 10 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 43 V min @ IR = 1 mA - precise breakdown threshold for reliable overvoltage triggering |
| VCL | 59.3 V max @ IPP = 28 A (10/1000 µs) - limits downstream voltage stress during transients |
| IPP | 28 A peak pulse current - supports robust protection against ISO 7637-2 Pulse 1/2a/5a waveforms |
| IR @ 150°C | ≤10.1 µA - ensures minimal standby power loss and signal integrity in hot under-hood locations |
| PPP | 600 W (10/1000 µs) - handles high-energy load dump and inductive switching surges |
| VF | <3.5 V @ IF = 50 A (pulse, tp ≤ 500 µs) - maintains low forward conduction loss during bidirectional fault events |
| Tj Range | -65 to +175 °C - enables direct placement near heat sources like ECUs and inverters |
Pinout & Package
Package: SMB (JEDEC DO-214AA), surface-mount plastic case with solderable matte tin-plated leads, UL94V-0 rated epoxy, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to protected line (e.g., 12 V rail); conducts during reverse transient clamp |
| Cathode | Clamping reference / surge sink | Connected to ground or low-impedance return; defines stand-off voltage VRM = 36.8 V |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature leakage control | ≤10.1 µA @ 150 °C - preserves battery drain budget in always-on automotive modules |
| Planar junction reliability | Stable VBR drift & low parametric shift over 1000+ thermal cycles - suited for under-hood ECU longevity |
| Low clamping factor | VCL/VBR = 1.38 - minimizes voltage overshoot during fast transients without overdesigning downstream ICs |
| Automotive qualification support | Specified across full -65 to +175 °C Tj range - meets AEC-Q101 stress test requirements for transient suppressors |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity and surge events on 12 V supply input. Use Value: Maintains 36.8 V stand-off while clamping to 59.3 V at 28 A, preventing latch-up in 5 V LDOs and CAN PHYs. | Use Scenario: Shields LIN bus transceivers and door module sensors from ESD and inductive kickback. IC Role / Device Role / Timing Role: Fast-response transient suppressor on 12 V bias rail feeding LIN PHY and MCU peripherals. Use Value: Delivers sub-1 ns response and ≤10.1 µA leakage at 150 °C, ensuring signal integrity in hot cabin environments. |
| Transmission Control Module (TCM) | Electric Power Steering (EPS) |
Use Scenario: Guards solenoid driver ICs and position sensor interfaces against relay bounce and motor commutation noise. IC Role / Device Role / Timing Role: High-energy (600 W) clamping device on 12 V switched supply lines. Use Value: Withstands 75 A non-repetitive surge (tp = 10 ms), protecting gate drivers from inductive turn-off spikes. | Use Scenario: Safeguards motor driver FETs and torque sensor analog front-ends from battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS on main 12 V input to EPS ECU board. Use Value: Operates continuously at 175 °C junction temperature, enabling compact placement near motor drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower PPP (400 W), higher IR (50 µA @ 150 °C), same SMB package | Limited to lower-energy transients; not qualified for extended high-temp automotive use | Select when cost sensitivity outweighs thermal performance and surge margin |
| 1.5SMC43A | Higher PPP (1500 W), larger SMC package, 10× higher IR (100 µA @ 150 °C) | Requires more PCB area; leakage may impact ultra-low-power always-on circuits | Choose for extreme surge immunity where space and leakage are secondary |
Compared with SMAJ43A and 1.5SMC43A, SM6HT43A uniquely balances 600 W surge handling, ≤10.1 µA high-temperature leakage, and SMB footprint-making it optimal for space-constrained, thermally demanding automotive modules requiring long-term reliability.
Availability
SM6HT43A is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control modules, and electric power steering systems requiring stable component supply across extended temperature ranges and automotive lifecycle demands.
Supply support for SM6HT43A 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.
The SM6HT series belongs to ST's automotive-grade Transil™ TVS portfolio, engineered specifically for high-temperature transient suppression in engine bay and powertrain electronics where conventional TVS devices fail due to thermal runaway or excessive leakage.
FAQ
Is SM6HT43A AEC-Q101 qualified?
No, SM6HT43A is not individually AEC-Q101 certified; however, it is designed, characterized, and specified for automotive applications per AEC-Q101 stress test conditions-including operating junction temperature up to 175 °C, high-temperature leakage validation, and robust surge performance. System-level qualification remains the responsibility of the end customer.
What is the maximum continuous power dissipation for SM6HT43A?
SM6HT43A has a continuous power dissipation rating of 6 W at ambient temperature of 50 °C with infinite heatsink conditions. On standard FR4 PCB with recommended pad layout, derating applies per Figure 2 in the datasheet, yielding ~0.6 W at 100 °C ambient due to Rth(j-a) = 100 °C/W.
Can SM6HT43A be used in bidirectional configurations?
No. SM6HT43A is strictly unidirectional, with cathode marked by a band. For bidirectional protection, two devices must be connected in series opposing configuration-or a dedicated bidirectional part such as SM6HT43AY (if available) must be selected.
Does SM6HT43A meet RoHS and REACH requirements?
Yes. The SM6HT43A package is RoHS-compliant (lead-free per ECOPACK® specification) and conforms to REACH SVHC regulations. Marking "e3" on the device indicates lead-free termination, and the epoxy compound meets UL94V-0 flammability rating.
SM6HT43A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6HT, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 10.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SM6HT43A FAQ
1.How can I place an order for SM6HT43A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6HT43A 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 SM6HT43A reliable?
The price and inventory of SM6HT43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6HT43A is usually 5 days.
3.What payment methods are accepted for SM6HT43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6HT43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6HT43A?
SM6HT43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6HT43A 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 SM6HT43A?
For technical support, including SM6HT43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6HT43A requirements.
6.How does Aetrix verify that SM6HT43A is sourced from the original manufacturer or authorized distributors?
All SM6HT43A 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 SM6HT43A meets industry standards.
7.What is the process for return or replacement of SM6HT43A?
All SM6HT43A units undergo pre-shipment inspection (PSI). If there is an issue with SM6HT43A, 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 SM6HT43A part is unused and in its original packaging.
Return procedure for SM6HT43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6HT43A Tags
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