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Vishay General Semiconductor - Diodes Division SM6T39AHE3/5B
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- Part No.:
- SM6T39AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHE3/5B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,159
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Product details
Overview
SM6T39AHE3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR at 1 mA), 53.9 V max clamping voltage at 11.1 A (10/1000 μs), 600 W peak pulse power, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T39AHE3/5B datasheet, SM6T39AHE3/5B pinout, SM6T39AHE3/5B application, or SM6T39AHE3/5B equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, thermal resistance (RθJA = 100 °C/W), and compliance with automotive reliability standards.
Technical Context
The SM6T39AHE3/5B operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to deliver precise reverse-breakdown triggering and low-inductance transient suppression. Its clamping behavior is defined by a 10/1000 μs waveform test condition, with guaranteed VC ≤ 53.9 V at IPPM = 11.1 A.
Designed for surface-mount assembly on 5.0 mm × 5.0 mm copper pads per terminal, it meets J-STD-020 MSL Level 1 (260 °C peak reflow) and supports operation from –65 °C to +150 °C junction temperature. The device is RoHS-compliant and qualified to AEC-Q101 for automotive-grade robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin. |
| VBR (min/max) | 37.1 V / 41.0 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - Clamped voltage seen by protected circuit; limits stress on downstream ICs or MOSFETs. |
| PPPM | 600 W - Peak transient energy absorption capability; sustains standard lightning/surge immunity tests. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires adequate PCB copper area for thermal management. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., ground or return path); defines unidirectional conduction direction. |
| Cathode | Avalanche clamping node / Transient sink | Marked with band; connected to line being protected (e.g., 12 V rail or sensor output); conducts surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repeated surge stress. |
| 600 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-ground) surge immunity requirements. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Low inductance SMB package | Minimizes voltage overshoot during fast transients (< 1 ns rise time), improving protection fidelity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and ground to limit voltage excursions to ≤53.9 V. Use Value: Prevents damage to microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a (load dump) events. | Use Scenario: Safeguarding analog outputs of pressure or temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 4–20 mA or 0–10 V signal lines exposed to ESD and inductive switching noise. Use Value: Maintains signal integrity by limiting transients to sub-55 V while adding < 1 pF capacitance at zero bias. |
| Consumer Power Adapter Input Protection | Telecom DC Power Feeder Protection |
Use Scenario: Front-end surge suppression in AC/DC adapters for laptops and monitors subjected to mains-borne surges. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side DC output (e.g., 19 V rail) before DC-DC regulation. Use Value: Absorbs 600 W pulses without degradation, enabling compact design with no external heat sinking required. | Use Scenario: Overvoltage protection on -48 V DC feeder lines in telecom base stations and remote radio units. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to system ground, clamping positive-going surges on negative supply rails. Use Value: Withstands repeated 10/1000 μs surges up to 11.1 A while maintaining VWM = 33.3 V for stable bias operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52 | Same SMB package, VWM = 33 V, VC = 53.3 V @ 11.2 A, but not AEC-Q101 qualified. | Limited to commercial/industrial use; lacks automotive qualification testing and traceability. | Select when AEC-Q101 is not required and cost sensitivity outweighs automotive reliability needs. |
| P6SMB33AHE3_A/H | Same electrical specs (VWM = 33 V, VC = 53.9 V), identical AEC-Q101 qualification, but uses legacy P6SMB prefix and different reel packaging (7" tape). | No functional difference; differs only in part numbering convention and delivery format. | Select when legacy BOM alignment or specific reel size (7") is mandated by production planning. |
Compared with SM6T39AHE3/5B, SMBJ33A-E3/52 offers identical clamping performance but lacks automotive qualification, while P6SMB33AHE3_A/H matches all electrical and reliability specs but uses alternate naming and packaging-making it a direct specification-equivalent alternative.
Availability
SM6T39AHE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer power adapters, and telecom DC power systems requiring stable component supply with AEC-Q101 assurance and consistent surge performance.
Supply support for SM6T39AHE3/5B 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for high-energy transient suppression in space-constrained, high-reliability applications-particularly where automotive qualification, low clamping voltage, and automated SMT placement are critical.
FAQ
What is the maximum clamping voltage of the SM6T39AHE3/5B under standard surge conditions?
The SM6T39AHE3/5B has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at its peak pulse current of 11.1 A. This value is measured per JEDEC standards and guarantees the protected circuit sees no more than 53.9 V during such transients. The SM6T39AHE3/5B maintains this clamping performance across its rated temperature range and after repeated surge events, provided derating guidelines are followed.
Is the SM6T39AHE3/5B suitable for automotive applications?
Yes, the SM6T39AHE3/5B is explicitly AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". It undergoes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance required for automotive under-hood and cabin modules. The SM6T39AHE3/5B is commonly used in engine control units, body control modules, and ADAS sensor power rails where reliability under harsh conditions is mandatory.
What does the "HE3" suffix indicate in SM6T39AHE3/5B?
The "HE3" suffix in SM6T39AHE3/5B denotes RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade "E3" parts and halogen-free "HM3" versions. The "HE3" designation confirms full compliance with automotive reliability standards, traceable lot control, and extended temperature operation (–65 °C to +150 °C). The SM6T39AHE3/5B is manufactured and tested to meet these exact specifications.
How does the SMB (DO-214AA) package of the SM6T39AHE3/5B affect PCB layout?
The SMB package of the SM6T39AHE3/5B requires minimum 5.0 mm × 5.0 mm copper pad areas per terminal for optimal thermal dissipation and surge current handling. Its low-profile form factor (max height 1.95 mm) supports dense layouts and automated placement. The cathode band must be oriented correctly per silkscreen; incorrect polarity renders the SM6T39AHE3/5B ineffective for unidirectional protection. Pad dimensions follow Vishay's recommended outline (0.086" × 0.130").
What is the reverse leakage current of the SM6T39AHE3/5B at its stand-off voltage?
At its maximum stand-off voltage (VWM = 33.3 V), the SM6T39AHE3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This low leakage ensures minimal power loss in standby mode and avoids false triggering in high-impedance circuits. Leakage remains below 10 μA up to 80 % of VWM and is fully characterized across the –65 °C to +150 °C operating range. The SM6T39AHE3/5B maintains this spec in both initial and post-surge conditions.
SM6T39AHE3/5B 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:
- Discontinued at Digi-Key
- 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 (SMBJ)
SM6T39AHE3/5B FAQ
1.How can I place an order for SM6T39AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHE3/5B 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 SM6T39AHE3/5B reliable?
The price and inventory of SM6T39AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39AHE3/5B is usually 5 days.
3.What payment methods are accepted for SM6T39AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHE3/5B?
SM6T39AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHE3/5B 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 SM6T39AHE3/5B?
For technical support, including SM6T39AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHE3/5B requirements.
6.How does Aetrix verify that SM6T39AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T39AHE3/5B 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 SM6T39AHE3/5B meets industry standards.
7.What is the process for return or replacement of SM6T39AHE3/5B?
All SM6T39AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHE3/5B, 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 SM6T39AHE3/5B part is unused and in its original packaging.
Return procedure for SM6T39AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39AHE3/5B Tags
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