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Vishay General Semiconductor - Diodes Division SM6T39AHM3_A/I
- Part No.:
- SM6T39AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHM3_A/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,413
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Product details
Overview
SM6T39AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 39 V breakdown voltage (VBR = 37.1–41.0 V at 1.0 mA), 53.9 V max clamping voltage (VC) at 11.1 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It protects MOSFETs and sensor signal lines in automotive ECUs against inductive switching transients.
For engineers reviewing the SM6T39AHM3_A/I datasheet, SM6T39AHM3_A/I pinout, SM6T39AHM3_A/I application, or SM6T39AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, and SMB thermal performance under 150 °C junction temperature limits.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, triggering avalanche conduction when transient voltage exceeds its VWM = 33.3 V standoff level. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM).
Designed for surface-mount placement on PCBs with 0.2" × 0.2" copper pads per terminal, it delivers 600 W surge handling per JEDEC-standard 10/1000 μs waveform while maintaining low inductance and meeting MSL Level 1 reflow requirements (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise avalanche initiation window for reliable overvoltage detection |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 53.9 V at 11.1 A - clamping voltage during 600 W transient, limiting downstream IC stress |
| PPPM | 600 W - peak pulse power rating with 10/1000 μs waveform, validated per Fig. 1 |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance to ambient, used to calculate safe power derating above 25 °C |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode marked by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; forms clamping loop with cathode |
| Cathode | Avalanche conduction node / protected line connection | Connected to signal or power line requiring protection; carries full transient current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surges |
| 600 W peak pulse power (10/1000 μs) | Handles high-energy transients common in automotive load-dump and inductive-switching events |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver pins from load-dump and alternator ripple transients in 12 V vehicle electrical systems. IC Role / Device Role: Unidirectional TVS placed between protected signal line and chassis ground to clamp positive-going surges. Use Value: Limits voltage to ≤53.9 V during 11.1 A transients, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Shields encoder feedback lines and gate driver inputs from commutation-induced spikes in BLDC motor drives. IC Role / Device Role: Standoff-rated TVS on differential analog inputs to suppress ±1 kV EFT bursts without signal distortion. Use Value: Maintains <1.0 μA leakage at 33.3 V, preserving signal integrity in precision position sensing circuits. |
| Consumer Appliance Power Supply | Telecom Base Station DC Input |
Use Scenario: Safeguards primary-side controller ICs and optocoupler inputs against AC line surge coupling into low-voltage control rails. IC Role / Device Role: Secondary-side clamping device on 24 V auxiliary supply rail feeding MCU and sensors. Use Value: Withstands 100 A IFSM (10 ms half-sine), surviving repeated inrush-related overstress events during power cycling. | Use Scenario: Guards 48 V DC input stage of remote radio units against lightning-induced surges entering via outdoor cabling. IC Role / Device Role: First-stage unidirectional suppressor before DC-DC converter input filter. Use Value: Delivers 600 W pulse handling with 100 °C/W RθJA, enabling thermal design margin under sealed enclosure conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39A | Same VBR range (37.1–41.0 V), but SMA package (higher RθJA = 140 °C/W); not AEC-Q101 qualified | Limited to commercial-grade industrial or consumer use; unsuitable for automotive under-hood deployment | Select SMAJ39A only if cost sensitivity outweighs thermal and qualification requirements |
| SMCJ39A | Higher PPPM = 1500 W, same VBR, but larger SMC package; AEC-Q101 available only in HM3 suffix variants | Used where higher surge margin is required (e.g., telecom lightning protection), but requires PCB area increase | Choose SMCJ39A when system-level surge testing exceeds IEC 61000-4-5 Level 4 |
Compared with SMAJ39A and SMCJ39A, SM6T39AHM3_A/I provides optimal balance of AEC-Q101 compliance, SMB footprint efficiency, and 600 W surge capability-making it preferred for space-constrained automotive modules where qualification and thermal performance are jointly critical.
Availability
SM6T39AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drive interfaces, and telecom DC input protection requiring stable component supply with halogen-free, AEC-Q101-qualified TVS diodes.
Supply support for SM6T39AHM3_A/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SM6T Series is designed specifically for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, low clamping voltage, and consistent avalanche behavior are mandatory.
FAQ
What is the breakdown voltage tolerance for SM6T39AHM3_A/I?
The SM6T39AHM3_A/I has a specified breakdown voltage (VBR) range of 37.1 V to 41.0 V at 1.0 mA test current, per Vishay Document 88385. This ±5.5% tolerance ensures predictable clamping onset across production lots and temperature ranges, critical for protecting 3.3 V and 5 V logic interfaces without premature conduction.
Is SM6T39AHM3_A/I suitable for bidirectional transient protection?
No, SM6T39AHM3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SM6T39CA). Using SM6T39AHM3_A/I on AC-coupled or differential lines without external polarity control may result in forward conduction and failure.
Does SM6T39AHM3_A/I meet automotive qualification standards?
Yes, SM6T39AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024). This qualification covers stress tests including HTGB, HTRB, temperature cycling, and ESD, validating its suitability for automotive powertrain and body electronics.
What is the maximum clamping voltage of SM6T39AHM3_A/I under surge conditions?
The SM6T39AHM3_A/I has a maximum clamping voltage (VC) of 53.9 V at 11.1 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per Figure 1 in the datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
How does the SMB package of SM6T39AHM3_A/I affect thermal performance?
The SMB (DO-214AA) package of SM6T39AHM3_A/I provides a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. This enables reliable 5.0 W steady-state power dissipation at 50 °C ambient, supporting sustained operation in compact, thermally constrained layouts.
SM6T39AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 11.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T39AHM3_A/I FAQ
1.How can I place an order for SM6T39AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHM3_A/I 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 SM6T39AHM3_A/I reliable?
The price and inventory of SM6T39AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T39AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHM3_A/I?
SM6T39AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHM3_A/I 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 SM6T39AHM3_A/I?
For technical support, including SM6T39AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHM3_A/I requirements.
6.How does Aetrix verify that SM6T39AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T39AHM3_A/I 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 SM6T39AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T39AHM3_A/I?
All SM6T39AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHM3_A/I, 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 SM6T39AHM3_A/I part is unused and in its original packaging.
Return procedure for SM6T39AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39AHM3_A/I Tags
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