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Vishay General Semiconductor - Diodes Division SM6T39CAHE3/5B
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- Part No.:
- SM6T39CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHE3/5B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,882
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Product details
Overview
SM6T39CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 39 V breakdown voltage (VBR = 37.1–41.0 V at 1 mA), 600 W peak pulse power (10/1000 μs), and clamping voltage of 53.9 V at 11.1 A. It provides robust ESD and surge protection for automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SM6T39CAHE3/5B datasheet, SM6T39CAHE3/5B pinout, SM6T39CAHE3/5B application, or SM6T39CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.38), TJ max. of +150 °C, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SM6T39CAHE3/5B operates as a voltage-clamped bidirectional protector, leveraging a glass-passivated silicon junction to achieve fast response (<1 ns) to transients. Its symmetrical IV characteristics enable identical clamping in both polarities, eliminating polarity marking requirements.
Designed for surface-mount use on 0.2" × 0.2" copper pads per terminal, it delivers 600 W peak pulse power under IEC 61000-4-5 (10/1000 μs) while maintaining low inductance and thermal resistance (RθJA = 100 °C/W, RθJL = 20 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines precise voltage threshold where clamping begins in either direction |
| VWM | 33.3 V - maximum continuous reverse stand-off voltage before leakage exceeds 1 μA |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - actual clamped voltage during worst-case surge, critical for downstream IC survival |
| PPPM | 600 W - peak transient energy absorption capacity under standardized surge waveform |
| TJ max. | +150 °C - enables reliable operation in under-hood automotive environments and high-ambient industrial settings |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking. Matte tin-plated leads, RoHS-compliant, MSL Level 1, LF peak 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | One side of symmetrical PN junction; accepts surge current in either polarity |
| Cathode | Transient current entry point (negative half-cycle) | Other side of symmetrical PN junction; functionally identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity without external series impedance |
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Low inductance SMB package | Minimizes voltage overshoot during nanosecond-scale transients (e.g., ESD, relay bounce) |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector interface to shunt surge energy before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and analog front-ends by limiting voltage to ≤53.9 V during 11.1 A surges. | Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-wiring induced surges and ground loop transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC I/O lines, operating in parallel with optocoupler or digital isolator inputs. Use Value: Enables >100,000 surge cycles without degradation due to low clamping ratio and AEC-Q101 stress validation. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in set-top boxes and smart displays exposed to human-body-model discharges. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp positioned after common-mode choke to absorb differential-mode ESD events. Use Value: Clamps 8 kV HBM ESD pulses within <1 ns while adding <0.5 pF parasitic capacitance-no signal integrity impact at 480 Mbps. | Use Scenario: Surge suppression on RS-485/RS-422 differential pairs in base station backhaul equipment subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Symmetrical TVS pair across A/B lines to maintain common-mode rejection while clamping line-to-line transients. Use Value: Maintains signal fidelity up to 10 Mbps by limiting differential overshoot to ≤53.9 V with minimal jitter contribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39CA | Same VBR range (37.1–41.0 V) and PPPM (400 W), but lower peak power rating and larger SMA package (DO-214AC) | Not AEC-Q101 qualified; suitable only for commercial-grade non-automotive designs | Select when cost sensitivity outweighs automotive qualification and board space allows larger footprint |
| 1.5KE39CA | Higher PPPM (1500 W), through-hole DO-15 package, higher clamping voltage (67.5 V at 22.2 A) | Requires manual or wave soldering; unsuitable for high-density SMT layouts | Choose for legacy through-hole systems needing higher surge margin where PCB real estate permits |
Compared with SMAJ39CA and 1.5KE39CA, the SM6T39CAHE3/5B uniquely combines AEC-Q101 qualification, SMB footprint, and optimized 600 W/53.9 V clamping performance-making it the preferred choice for space-constrained automotive and industrial SMT designs requiring production-grade reliability.
Availability
SM6T39CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, consumer USB port hardening, and telecom line interface circuits requiring stable component supply and long-term lifecycle support.
Supply support for SM6T39CAHE3/5B 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 designed specifically for surface-mount transient voltage suppression in automotive, industrial, and communications systems-prioritizing low clamping ratio, AEC-Q101 compliance, and compatibility with high-speed automated assembly.
FAQ
What does the "CA" suffix indicate in SM6T39CAHE3/5B?
The "CA" suffix in SM6T39CAHE3/5B denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. Unlike unidirectional variants (e.g., SM6T39A), SM6T39CAHE3/5B has no cathode marking and exhibits identical breakdown and clamping behavior for positive and negative transients-critical for protecting AC-coupled or differential signal lines.
Is SM6T39CAHE3/5B suitable for automotive applications?
Yes, SM6T39CAHE3/5B is AEC-Q101 qualified (indicated by the "HE3" suffix), having passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD. It is explicitly intended for automotive use cases such as engine control units, ADAS sensor interfaces, and infotainment system I/O protection-operating reliably from −65 °C to +150 °C junction temperature.
What is the clamping voltage of SM6T39CAHE3/5B under a 10/1000 μs surge?
The clamping voltage of SM6T39CAHE3/5B is 53.9 V at 11.1 A under a 10/1000 μs waveform (per Vishay document 88385). This value represents the maximum voltage seen across the device during a standardized surge event and is essential for ensuring downstream components like microcontrollers or transceivers remain within their absolute maximum ratings.
How does the SMB (DO-214AA) package of SM6T39CAHE3/5B compare to SMA (DO-214AC)?
The SMB package of SM6T39CAHE3/5B measures 3.94 mm × 2.20 mm × 1.52 mm, offering a 30 % smaller footprint than the SMA (DO-214AC) package. This enables higher PCB density and improved thermal performance per unit area. Both packages are RoHS-compliant and rated for MSL Level 1, but SMB supports finer pitch layouts and faster reflow profiles due to lower thermal mass.
Does SM6T39CAHE3/5B require a heatsink for normal operation?
No, SM6T39CAHE3/5B does not require an external heatsink for typical transient suppression duty cycles. Its RθJA of 100 °C/W and RθJL of 20 °C/W allow safe operation with standard 0.2" × 0.2" copper pads per terminal. Continuous power dissipation is limited to 5.0 W at TA = 50 °C, but transient events are non-repetitive-so thermal accumulation is negligible under IEC 61000-4-5 test conditions.
SM6T39CAHE3/5B 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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T39CAHE3/5B FAQ
1.How can I place an order for SM6T39CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHE3/5B 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 SM6T39CAHE3/5B reliable?
The price and inventory of SM6T39CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SM6T39CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHE3/5B?
SM6T39CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHE3/5B 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 SM6T39CAHE3/5B?
For technical support, including SM6T39CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHE3/5B requirements.
6.How does Aetrix verify that SM6T39CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHE3/5B 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 SM6T39CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SM6T39CAHE3/5B?
All SM6T39CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHE3/5B, 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 SM6T39CAHE3/5B part is unused and in its original packaging.
Return procedure for SM6T39CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CAHE3/5B Tags
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