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Vishay General Semiconductor - Diodes Division SM6T39CAHE3_B/I
- Part No.:
- SM6T39CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHE3_B/I.pdf
- Description:
- 600W,39V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,047
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Product details
Overview
SM6T39CAHE3_B/I from Vishay General Semiconductor is a bidirectional surface-mount TRANSZORB® transient voltage suppressor in SMB (DO-214AA) package, rated for 39 V breakdown voltage (VBR = 37.1–41.0 V at 1.0 mA), 600 W peak pulse power (10/1000 μs), and clamping voltage of 53.9 V at 11.1 A. It protects signal lines and MOSFET gates in automotive sensor units and industrial control interfaces against inductive switching transients.
For engineers reviewing the SM6T39CAHE3_B/I datasheet, SM6T39CAHE3_B/I pinout, SM6T39CAHE3_B/I application, or SM6T39CAHE3_B/I equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low clamping ratio (VC/VBR ≈ 1.38), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped crowbar during transient overvoltage events, conducting bidirectionally when reverse or forward voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM = 33.3 V) and robust surge handling up to 100 A IFSM (unidirectional only; not applicable here due to CA suffix).
Designed for high-reliability automotive and industrial environments, SM6T39CAHE3_B/I meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise conduction onset in both directions |
| VWM | 33.3 V - maximum continuous reverse stand-off voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - actual clamping voltage limiting downstream IC stress |
| PPPM | 600 W - peak transient energy absorption capability under standardized surge waveform |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial enclosures |
| RθJA | 100 °C/W - thermal resistance indicating need for minimum 5.0 mm × 5.0 mm copper pads per terminal |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional current path | No cathode band; terminals interchangeable - conducts equally in either direction above VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in automotive load-dump and inductive switch-off events |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5%) and low long-term parameter drift under thermal cycling |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture-related popcorning or delamination |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, relay bounce) |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional voltage clamp placed across signal line and ground. Use Value: Limits transient voltage to ≤53.9 V, preventing damage to 3.3 V/5 V interface ICs while maintaining signal integrity. |
Use Scenario: Shielding digital input channels of programmable logic controllers from relay coil flyback and motor drive noise. IC Role / Device Role: Parallel-connected TVS absorbing inductive kickback energy before it reaches optocoupler inputs. Use Value: Enables reliable 24 V DC input operation with <1.0 μA leakage at 33.3 V, minimizing false triggering. |
| Consumer Power Adapter Surge Suppression | Telecom Line Interface Protection |
Use Scenario: Safeguarding secondary-side rectifier outputs and feedback circuits in AC/DC adapters against lightning-induced surges. IC Role / Device Role: Clamp placed between output rail and ground to limit overvoltage during external surge coupling. Use Value: Absorbs 600 W peak power without degradation, preserving adapter certification compliance (IEC 61000-4-5). |
Use Scenario: Protecting Ethernet PHY or DSL line drivers from induced surges on unshielded twisted-pair cabling. IC Role / Device Role: Differential-mode TVS across line pairs to suppress common-mode transients. Use Value: Maintains low capacitance and symmetrical clamping (VC matched ±0.2 V), avoiding signal distortion in 10/100BASE-TX links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39CA | Same VBR range (37.1–41.0 V), but lower PPPM = 400 W; SMA package (larger footprint, higher RθJA = 140 °C/W) | Limited to lower-energy transients; unsuitable for automotive load-dump where 600 W is required | Select SM6T39CAHE3_B/I when 600 W rating and AEC-Q101 qualification are mandatory |
| 1.5KE39CA | Higher PPPM = 1500 W, but axial DO-201 package - incompatible with SMT automation and board space constraints | Requires through-hole assembly; not viable for high-density consumer or telecom PCBs | Choose SM6T39CAHE3_B/I for surface-mount production, especially where AEC-Q101 and MSL-1 compliance are needed |
Compared with SMAJ39CA and 1.5KE39CA, SM6T39CAHE3_B/I uniquely combines 600 W surge capability, SMB footprint, AEC-Q101 qualification, and MSL Level 1 reflow compatibility - making it optimal for automotive and high-volume industrial SMT designs requiring zero layout change from standard SMB footprints.
Availability
SM6T39CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, and telecom line interface surge suppression requiring stable component supply and full traceability.
Supply support for SM6T39CAHE3_B/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 and automotive-grade validation.
The SM6T Series was developed specifically for high-energy transient suppression in space-constrained, high-reliability applications - targeting automotive electronics, industrial controls, and communications infrastructure where bidirectional clamping and AEC-Q101 compliance are essential.
FAQ
What does the "CA" suffix indicate in SM6T39CAHE3_B/I?
The "CA" suffix in SM6T39CAHE3_B/I denotes a bidirectional configuration, meaning the device clamps voltage symmetrically in both forward and reverse directions. Unlike unidirectional variants (e.g., SM6T39A), SM6T39CAHE3_B/I has no cathode marking and provides identical electrical characteristics regardless of terminal orientation - critical for protecting AC-coupled or differential signal paths.
Is SM6T39CAHE3_B/I suitable for automotive applications?
Yes, SM6T39CAHE3_B/I is AEC-Q101 qualified (confirmed by HE3 suffix and Vishay documentation), tested for temperature cycling, high-temperature reverse bias, and accelerated life testing. Its 150 °C max junction temperature, MSL Level 1 rating, and 260 °C lead-free reflow compatibility make it appropriate for engine control units, body electronics, and ADAS sensor modules.
What is the clamping voltage of SM6T39CAHE3_B/I at rated peak pulse current?
SM6T39CAHE3_B/I clamps to 53.9 V at its rated peak pulse current of 11.1 A under the 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and defines the maximum voltage imposed on protected circuitry during a standardized surge event - directly determining whether downstream components like 3.3 V or 5 V ICs remain within safe operating limits.
How does the SMB (DO-214AA) package of SM6T39CAHE3_B/I compare to SMA in size and thermal performance?
The SMB package of SM6T39CAHE3_B/I measures 3.94 mm × 2.20 mm × 1.52 mm, smaller than SMA (4.57 mm × 2.79 mm × 2.30 mm). Thermally, SM6T39CAHE3_B/I has RθJA = 100 °C/W (on 5.0 mm × 5.0 mm pads), versus ~140 °C/W for SMAJ39CA - enabling better power dissipation in dense layouts without additional heatsinking.
Does SM6T39CAHE3_B/I require derating at elevated ambient temperatures?
Yes, SM6T39CAHE3_B/I must be derated above TA = 25 °C per Figure 2 in Vishay document 88385: peak pulse power decreases linearly to zero at 150 °C junction temperature. For example, at TA = 85 °C with 5.0 mm × 5.0 mm pads, usable PPPM drops to ~420 W - design margins must account for this to ensure reliable transient suppression.
SM6T39CAHE3_B/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:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T39CAHE3_B/I FAQ
1.How can I place an order for SM6T39CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHE3_B/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 SM6T39CAHE3_B/I reliable?
The price and inventory of SM6T39CAHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T39CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHE3_B/I?
SM6T39CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHE3_B/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 SM6T39CAHE3_B/I?
For technical support, including SM6T39CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHE3_B/I requirements.
6.How does Aetrix verify that SM6T39CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHE3_B/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 SM6T39CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T39CAHE3_B/I?
All SM6T39CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHE3_B/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 SM6T39CAHE3_B/I part is unused and in its original packaging.
Return procedure for SM6T39CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CAHE3_B/I Tags
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