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STMicroelectronics SM6HT24A
- Part No.:
- SM6HT24A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6HT24A.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
SM6HT24A from STMicroelectronics is a unidirectional high-temperature Transil™ TVS diode in SMB (DO-214AA) package, designed for automotive circuit protection. It provides 24 V standoff voltage (VRM), 25.2 V breakdown voltage (VBR) at 1 mA, 33.2 V clamping voltage (VCL) at 18 A IPP, and 600 W peak pulse power (10/1000 µs) with ≤5 µA leakage at 150 °C - deployed in engine control units and battery management systems.
For engineers reviewing the SM6HT24A datasheet, SM6HT24A pinout, SM6HT24A application, or SM6HT24A equivalent, key selection criteria include high-temperature leakage performance (≤5 µA @ 150 °C), low clamping factor (VCL/VBR ≈ 1.31), unidirectional polarity, SMB footprint compatibility, and automotive-grade thermal robustness (Tj up to 175 °C).
Technical Context
This Transil device operates in voltage regulation mode during transient overvoltage events, leveraging planar junction technology to maintain stable VBR and low IR across extended temperature ranges. Its clamping behavior is characterized by fast response time (<1 ns) and minimal voltage overshoot under 10/1000 µs surge conditions.
The thermal design enables continuous operation at Tamb = 50 °C with 6 W dissipation on infinite heatsink, supported by Rth(j-l) = 20 °C/W and Rth(j-a) = 100 °C/W on recommended FR4 pad layout. Junction temperature range spans −65 to +175 °C, meeting automotive under-hood environmental requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 24 V - maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 25.2 V @ 1 mA - precise regulation threshold triggering avalanche conduction |
| Clamping Voltage (VCL) | 33.2 V @ 18 A IPP - limits downstream voltage during 10/1000 µs transients |
| Peak Pulse Power | 600 W (10/1000 µs) - sustains high-energy surges without failure |
| Leakage Current (IRM) | ≤5 µA @ 150 °C - ensures minimal standby power loss in hot environments |
| Junction Temperature Range | −65 to +175 °C - validated for under-hood automotive placement |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly |
Pinout & Package
SM6HT24A uses the SMB (JEDEC DO-214AA) molded plastic package with planar junction construction. Terminals are solder-plated and RoHS-compliant (ECOPACK®). Polarity is indicated by a cathode band; the cathode terminal connects to the protected line's ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink input | Connected to protected signal/power line; conducts surge current toward cathode |
| Cathode | Reference return path | Connected to system ground or low-impedance return; defines clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | ≤5 µA leakage at 150 °C enables stable operation in engine bay environments |
| Low clamping factor | VCL/VBR = 1.31 minimizes voltage overshoot during ESD/EFT events |
| Automotive qualification | Rated for Tj = −65 to +175 °C and compliant with AEC-Q101 stress test requirements |
| Fast transient response | Sub-nanosecond turn-on ensures protection before sensitive ICs experience overstress |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: Protects 12 V supply rail against load dump and alternator transients in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive-going surges above 24 V while blocking reverse leakage. Use Value: Withstands 600 W pulses and maintains <5 µA leakage at 150 °C, preventing false resets or latch-up during thermal cycling. | Use Scenario: Shields CAN_H/CAN_L differential pair from ISO 7637-2 pulse 1/2b/5a transients in BCMs. IC Role / Device Role / Timing Role: Placed between CAN transceiver I/O and connector; clamps common-mode surges to chassis ground. Use Value: 33.2 V clamping at 18 A ensures CAN PHY remains within ±40 V common-mode tolerance, preserving bit integrity. |
| Start-Stop System Battery Monitoring Circuit | Electric Power Steering (EPS) Motor Driver Gate Protection |
Use Scenario: Guards analog front-end of battery voltage sensor during cranking and regenerative braking events. IC Role / Device Role / Timing Role: Standoff-rated at 24 V, it blocks normal operation but activates during >25.2 V transients on sensing lines. Use Value: Low leakage preserves ADC accuracy; tight VBR tolerance (±2.8%) ensures consistent trip point across temperature. | Use Scenario: Protects high-side MOSFET gate driver inputs from inductive kickback in EPS motor H-bridge. IC Role / Device Role / Timing Role: Connected anode-to-gate, cathode-to-VDD; suppresses negative-going spikes below −0.7 V and clamps positive excursions. Use Value: Fast response prevents gate oxide damage; SMB footprint allows placement near driver IC without trace inductance penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower peak power (400 W), higher leakage (50 µA @ 150 °C), same SMB package | Not rated for sustained 150 °C operation; suitable only for cabin-mounted modules | Select when cost sensitivity outweighs under-hood thermal margin requirements |
| 1.5SMC24A | Higher power (1500 W), larger SMC package, slower thermal response due to higher Rth(j-a) | Requires PCB area increase; less suitable for dense ECU layouts | Choose when surge energy exceeds 600 W but board space permits SMC footprint |
Compared with SMAJ24A and 1.5SMC24A, SM6HT24A uniquely balances automotive-grade thermal endurance (≤5 µA @ 150 °C), compact SMB form factor, and 600 W surge capability - making it optimal for space-constrained, high-temperature ECU and BCM deployments where leakage-induced drift must be minimized.
Availability
SM6HT24A is available at Aetrix Electronics and suitable for engine control units, body control modules, start-stop battery monitors, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for SM6HT24A 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, specializing in automotive, industrial, and power discrete technologies with vertical manufacturing capabilities.
SM6HT belongs to ST's high-temperature Transil™ TVS portfolio, engineered specifically for under-hood automotive protection where conventional TVS devices fail due to thermal runaway or excessive leakage.
FAQ
Is SM6HT24A AEC-Q101 qualified?
Yes, SM6HT24A is AEC-Q101 qualified per STMicroelectronics' official documentation. It undergoes stress testing including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress test (uHAST) to validate reliability for automotive under-hood use up to 175 °C junction temperature.
What is the meaning of the marking 'EMB' on SM6HT24A?
The marking 'EMB' is the manufacturer-specific code for SM6HT24A, indicating its 24 V breakdown variant in the SM6HT series. It appears on the cathode band side of the SMB package and corresponds to the part number per ST's order information scheme - not a date or lot code.
Can SM6HT24A replace P6SMB24A in existing designs?
No - although both are SMB-packaged 24 V TVS diodes, SM6HT24A has tighter VBR tolerance (22.8–25.2 V vs. 22.8–27.6 V), lower leakage (≤5 µA @ 150 °C vs. ≤100 µA), and higher thermal rating. Direct replacement requires validation of clamping behavior under actual surge waveforms and thermal profile.
Does SM6HT24A support bidirectional transient suppression?
No - SM6HT24A is strictly unidirectional, with cathode marked by a band. It protects against positive transients only. For bidirectional protection (e.g., AC lines or differential buses), ST offers the complementary SM6HT24AY variant or discrete back-to-back configurations.
SM6HT24A 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 18A
- 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
SM6HT24A FAQ
1.How can I place an order for SM6HT24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6HT24A 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 SM6HT24A reliable?
The price and inventory of SM6HT24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6HT24A is usually 5 days.
3.What payment methods are accepted for SM6HT24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6HT24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6HT24A?
SM6HT24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6HT24A 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 SM6HT24A?
For technical support, including SM6HT24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6HT24A requirements.
6.How does Aetrix verify that SM6HT24A is sourced from the original manufacturer or authorized distributors?
All SM6HT24A 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 SM6HT24A meets industry standards.
7.What is the process for return or replacement of SM6HT24A?
All SM6HT24A units undergo pre-shipment inspection (PSI). If there is an issue with SM6HT24A, 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 SM6HT24A part is unused and in its original packaging.
Return procedure for SM6HT24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6HT24A Tags
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