My Inquiry
My Account
STMicroelectronics SM6HT30A
- Part No.:
- SM6HT30A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6HT30A.pdf
- Description:
- TVS DIODE 25.6VWM 41.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,770
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM6HT30A from STMicroelectronics is a unidirectional high-temperature Transil™ TVS diode in SMB (DO-214AA) package, designed for automotive circuit protection. It provides 30 V standoff voltage, 41.5 V clamping voltage at 40 A peak pulse current, and maintains ≤14.5 µA leakage at 150 °C junction temperature. Its 600 W peak pulse power (10/1000 µs) supports robust ESD and surge suppression in engine control units and body electronics.
For engineers reviewing the SM6HT30A datasheet, SM6HT30A pinout, SM6HT30A application, or SM6HT30A equivalent, key selection criteria include high-temperature leakage performance, clamping ratio (VCL/VBR = 1.45), unidirectional polarity marking (cathode band), and JEDEC DO-214AA thermal resistance (Rth(j-a) = 100 °C/W on recommended PCB layout).
Technical Context
The SM6HT30A operates as a silicon avalanche diode optimized for transient voltage suppression in harsh thermal environments. Its planar junction construction ensures stable breakdown at 28.5–31.5 V (VBR @ IR = 1 mA), with clamping voltage tightly specified at 41.5 V under 40 A 10/1000 µs surge.
Thermal design is enabled by Rth(j-l) = 20 °C/W (junction-to-leads) and operation up to Tj = 175 °C. The device exhibits αT = 10×10−4/°C temperature coefficient for VBR, enabling predictable voltage drift across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - Maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 28.5–31.5 V @ 1 mA - Avalanche onset range defining regulation threshold |
| Clamping Voltage (VCL) | 41.5 V @ 40 A, 10/1000 µs - Peak voltage seen by protected IC during worst-case surge |
| Peak Pulse Power | 600 W - Sustained energy absorption capability for ISO 7637-2 pulse 5a/b compliance |
| Leakage Current (IR) | ≤14.5 µA @ 30 V, Tj = 150 °C - Critical for low-power always-on automotive modules |
| Junction Temp Range | −65 to +175 °C - Enables placement near powertrain heat sources without derating |
| Package | SMB (DO-214AA) - Standard surface-mount footprint with cathode band polarity indicator |
Pinout & Package
SMB (JEDEC DO-214AA) molded plastic package with planar junction; solderable terminals per MIL-STD-750 Method 2026; cathode indicated by band; UL94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (unidirectional) | Connected to protected line; conducts surge current to ground when VRM exceeded |
| Cathode (banded end) | Reference node / ground return | Connected to system ground plane; defines polarity and enables proper clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature leakage control | ≤14.5 µA @ 150 °C enables use in under-hood ECUs without standby current penalty |
| Low clamping factor | VCL/VBR ≈ 1.45 ensures minimal overvoltage stress on downstream 3.3 V/5 V logic |
| Planar junction reliability | Stable VBR and low parameter drift over lifetime in automotive thermal cycling |
| 600 W surge rating | Meets ISO 7637-2 Level IV (100 V, 500 ms) and ISO 16750-2 load dump immunity requirements |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting CAN transceiver inputs against load dump and jump-start surges in gasoline/diesel engine compartments. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between CAN_H/CAN_L lines and ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to 41.5 V, preventing damage to ISO 11898-compliant transceivers rated for 40 V absolute maximum. | Use Scenario: Safeguarding LIN bus slave nodes (e.g., door lock actuators) from battery reversal and ESD events in passenger cabin. IC Role / Device Role / Timing Role: Standoff-rated protection element on LIN data line, conducting only during >30 V faults. Use Value: Maintains ≤14.5 µA leakage at 85 °C ambient, avoiding false wake-up in low-power sleep modes. |
| Transmission Control Module (TCM) | Advanced Driver Assistance Systems (ADAS) Camera Power Input |
Use Scenario: Suppressing alternator-induced spikes on 12 V supply rail feeding solenoid drivers and microcontrollers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, coordinated with upstream fuse and downstream LC filtering. Use Value: Withstands 175 °C junction temperature, allowing direct mounting on high-current PCB traces near transmission harness connectors. | Use Scenario: Protecting 5 V camera module power input from hot-swap transients during rear-view camera activation. IC Role / Device Role / Timing Role: Secondary protection stage after DC-DC converter, absorbing fast-rising ESD (IEC 61000-4-2 ±8 kV contact). Use Value: Clamps to 41.5 V within nanoseconds, preserving image sensor functionality without latch-up or reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | Lower peak power (400 W), higher Rth(j-a) (125 °C/W), same SMB package | Limited to lower-energy transients (e.g., IEC 61000-4-4 level 3) | Select when cost sensitivity outweighs need for full ISO 7637-2 compliance |
| 1.5SMC30A | Higher power (1500 W), larger SMC package (DO-214AB), 45 V clamping | Requires PCB redesign; better suited for 24 V commercial vehicle systems | Choose for heavy-duty truck applications where space allows larger footprint |
Compared with SMAJ30A and 1.5SMC30A, the SM6HT30A uniquely balances automotive-grade high-temperature leakage, 600 W surge capacity, and SMB footprint-making it optimal for space-constrained, thermally aggressive 12 V ECU designs requiring validated AEC-Q101 stress performance.
Availability
SM6HT30A is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control modules requiring stable component supply across extended automotive production lifecycles.
Supply support for SM6HT30A 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 broad manufacturing and qualification capabilities.
The SM6HT series belongs to ST's high-temperature Transil™ portfolio, engineered specifically for automotive electronic systems operating continuously at junction temperatures up to 175 °C while maintaining precise voltage clamping and ultra-low leakage.
FAQ
Is SM6HT30A AEC-Q101 qualified?
Yes, the SM6HT30A is AEC-Q101 qualified for automotive applications. STMicroelectronics certifies this device for stress testing including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress test (uHAST), ensuring reliability in under-hood environments up to 175 °C junction temperature.
What is the meaning of the 'ERB' marking on SM6HT30A?
The 'ERB' marking is the manufacturer-specific top-side code for SM6HT30A, indicating its 30 V breakdown voltage variant within the SM6HT family. It follows ST's standardized marking scheme where the third character ('B') denotes unidirectional polarity, and 'ER' maps to the 30 V VBR bin.
Can SM6HT30A replace SMA6J30A in existing designs?
No-SM6HT30A is not a drop-in replacement for SMA6J30A. While both are SMB-packaged 30 V TVS diodes, SM6HT30A offers superior high-temperature leakage performance (≤14.5 µA @ 150 °C vs. SMA6J30A's typical 50 µA) and higher thermal robustness, but requires validation of PCB thermal relief and clamping margin due to tighter VBR tolerance.
Does SM6HT30A support bidirectional transient protection?
No, SM6HT30A is strictly unidirectional. Its internal structure and cathode-band marking indicate single-polarity operation-designed to clamp positive transients only. For bidirectional protection (e.g., AC lines or differential buses), ST recommends the complementary SM6HT30AY or discrete back-to-back configuration.
SM6HT30A 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.5V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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
SM6HT30A FAQ
1.How can I place an order for SM6HT30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6HT30A 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 SM6HT30A reliable?
The price and inventory of SM6HT30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6HT30A is usually 5 days.
3.What payment methods are accepted for SM6HT30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6HT30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6HT30A?
SM6HT30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6HT30A 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 SM6HT30A?
For technical support, including SM6HT30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6HT30A requirements.
6.How does Aetrix verify that SM6HT30A is sourced from the original manufacturer or authorized distributors?
All SM6HT30A 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 SM6HT30A meets industry standards.
7.What is the process for return or replacement of SM6HT30A?
All SM6HT30A units undergo pre-shipment inspection (PSI). If there is an issue with SM6HT30A, 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 SM6HT30A part is unused and in its original packaging.
Return procedure for SM6HT30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6HT30A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
