My Inquiry
My Account
STMicroelectronics SM6HT36A
- Part No.:
- SM6HT36A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6HT36A.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,543
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM6HT36A from STMicroelectronics is a unidirectional high-temperature Transil™ TVS diode in SMB (DO-214AA) package, designed for automotive surge protection. It features 36 V breakdown voltage (VBR), 49.9 V clamping voltage at 33 A IPP, 600 W peak pulse power (10/1000 µs), and ≤5 µA leakage current at 150 °C - enabling robust ESD and load-dump suppression in engine control units and body electronics.
For engineers reviewing the SM6HT36A datasheet, SM6HT36A pinout, SM6HT36A application, or SM6HT36A equivalent, key selection criteria include high-temperature leakage performance, clamping ratio (VCL/VBR = 1.39), unidirectional polarity, SMB footprint compatibility, and automotive-grade junction temperature range (–65 to +175 °C).
Technical Context
This Transil device operates in avalanche breakdown mode to clamp transient overvoltages, with fast response time (<1 ns) and low clamping factor enabled by planar junction technology. Its thermal design supports continuous operation up to 175 °C junction temperature, backed by Rth(j-l) = 20 °C/W and Rth(j-a) = 100 °C/W on recommended FR4 PCB layout.
The diode is optimized for unidirectional surge suppression in 12 V automotive systems, where it absorbs load-dump pulses (ISO 7637-2 Pulse 5a) and ISO 10605 ESD events. Its VF < 3.5 V at 50 A pulse ensures minimal forward conduction loss during high-current transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 36 V nominal breakdown voltage @ 1 mA - defines precise turn-on threshold for transient clamping |
| VCL @ IPP | 49.9 V clamping voltage at 33 A peak pulse - limits downstream voltage stress during ISO 7637-2 Pulse 5a |
| PPP | 600 W peak pulse power (10/1000 µs) - meets automotive load-dump energy requirements |
| IR @ 150°C | ≤5 µA reverse leakage - ensures stable regulation and low standby power loss at elevated temperatures |
| Tj Range | –65 to +175 °C operating junction temperature - qualified for under-hood automotive environments |
| Rth(j-l) | 20 °C/W junction-to-leads thermal resistance - enables efficient heat transfer to PCB copper |
| Package | SMB (JEDEC DO-214AA) - industry-standard SMD footprint with cathode band marking |
Pinout & Package
SMB (DO-214AA) surface-mount package with molded plastic case, UL94V-0 flammability rating, and solderable terminals per MIL-STD-750 Method 2026. Cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (unidirectional) | Connected to protected line; conducts during reverse-biased clamping event |
| Cathode | Transient current exit point | Connected to ground or lower-potential rail; marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Leakage ≤5 µA at 150 °C - maintains protection integrity in under-hood ECUs |
| Low clamping ratio | VCL/VBR = 1.39 - minimizes overvoltage margin while preserving system safety margins |
| Automotive qualification | Rated for –65 to +175 °C Tj - compliant with AEC-Q101 stress test conditions |
| Planar junction construction | Enables tight VBR tolerance (±5 %) and repeatable clamping behavior across temperature |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection against ISO 7637-2 Pulse 5a load-dump transients on 12 V supply lines. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input stage. Use Value: Clamps 49.9 V at 33 A, limiting downstream IC stress without sacrificing response speed (<1 ns). | Use Scenario: ESD protection for LIN bus transceivers and sensor interfaces. IC Role / Device Role / Timing Role: Standoff voltage (36 V) isolates normal 12 V operation while clamping ±25 kV HBM ESD events. Use Value: Leakage ≤5 µA at 150 °C prevents signal distortion in high-temp cabin modules. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Camera Power Input |
Use Scenario: Surge suppression on solenoid driver power rails exposed to inductive kickback. IC Role / Device Role / Timing Role: Fast-response TVS absorbing repetitive 600 W pulses without degradation. Use Value: 600 W (10/1000 µs) rating sustains >10⁵ surge cycles in transmission valve control circuits. | Use Scenario: Input protection for 12 V camera power supply in rear-view and surround-view systems. IC Role / Device Role / Timing Role: Primary clamping device upstream of LDO regulator, with SMB footprint minimizing board space. Use Value: SMB package allows compact placement near connector; 175 °C Tj rating supports sealed housing thermal profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Lower PPP (400 W), higher VCL (58.1 V), same SMB package and VBR | Not rated for 150 °C operation; IR = 5 µA only at 25 °C | Select when ambient temperature stays below 85 °C and load-dump energy is reduced |
| SMCJ36A | Higher PPP (1500 W), larger SMC (DO-214AB) package, same VBR and Tj range | Requires larger PCB area; better suited for high-energy industrial surges | Select when system-level surge testing exceeds ISO 7637-2 Level IV or requires >1000 W headroom |
Compared with SMAJ36A and SMCJ36A, SM6HT36A uniquely balances 600 W pulse handling, 150 °C leakage stability, and SMB footprint - making it optimal for space-constrained, high-temperature automotive modules where thermal derating and board area are critical.
Availability
SM6HT36A is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera power inputs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM6HT36A 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 analog, microcontroller, power, and automotive-grade components.
The SM6HT series belongs to ST's automotive-qualified Transil™ TVS portfolio, engineered specifically for high-reliability transient suppression in under-hood and chassis-mounted electronic control units operating up to 175 °C.
FAQ
What is the maximum clamping voltage of SM6HT36A at its rated peak pulse current?
The SM6HT36A clamps to 49.9 V at 33 A peak pulse current (10/1000 µs waveform), measured at Tj = 25 °C. This value increases slightly with junction temperature but remains within automotive safety margins due to its low clamping ratio (1.39) and stable planar junction characteristics.
Is SM6HT36A suitable for bidirectional transient protection?
No. SM6HT36A is a unidirectional TVS diode, with polarity defined by the cathode band. It protects against positive transients on the anode side relative to cathode. For bidirectional protection, ST offers the SMBJ36CA or equivalent dual-diode configurations - not this part.
Does SM6HT36A meet AEC-Q101 qualification requirements?
Yes. The SM6HT36A is built using ST's high-reliability planar technology and specified for –65 to +175 °C junction temperature operation, meeting the environmental stress and lifetime requirements of AEC-Q101 for discrete semiconductors used in automotive applications.
Can SM6HT36A replace SMA6J36A in existing designs?
Not directly. While both are SMB-packaged 36 V TVS diodes, SMA6J36A has lower PPP (600 W vs. 400 W), higher VCL (58.1 V), and no 150 °C leakage specification. SM6HT36A offers superior high-temperature stability and tighter clamping - redesign verification is required for thermal and electrical margins.
SM6HT36A 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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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
SM6HT36A FAQ
1.How can I place an order for SM6HT36A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6HT36A 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 SM6HT36A reliable?
The price and inventory of SM6HT36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6HT36A is usually 5 days.
3.What payment methods are accepted for SM6HT36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6HT36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6HT36A?
SM6HT36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6HT36A 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 SM6HT36A?
For technical support, including SM6HT36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6HT36A requirements.
6.How does Aetrix verify that SM6HT36A is sourced from the original manufacturer or authorized distributors?
All SM6HT36A 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 SM6HT36A meets industry standards.
7.What is the process for return or replacement of SM6HT36A?
All SM6HT36A units undergo pre-shipment inspection (PSI). If there is an issue with SM6HT36A, 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 SM6HT36A part is unused and in its original packaging.
Return procedure for SM6HT36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6HT36A 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…
