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Vishay General Semiconductor - Diodes Division SM6T39CAHM3_B/H
- Part No.:
- SM6T39CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHM3_B/H.pdf
- Description:
- 600W,39V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,429
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Product details
Overview
SM6T39CAHM3_B/H 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 protects signal lines and MOSFET gates in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T39CAHM3_B/H datasheet, SM6T39CAHM3_B/H pinout, SM6T39CAHM3_B/H application, or SM6T39CAHM3_B/H equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (1.38), and SMB thermal resistance (RθJA = 100 °C/W).
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional CA construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low leakage (<1 μA at 33.3 V).
Designed for surface-mount automated placement, it meets J-STD-020 MSL Level 1 with 260 °C reflow peak, and delivers 600 W surge capability on standard 5.0 mm × 5.0 mm copper pads - validated per Fig. 1 and Fig. 2 in Document 88385.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines reliable conduction onset under transient stress |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - clamping voltage limiting downstream IC stress during surge |
| PPPM | 600 W - peak transient energy absorption capacity under standardized waveform |
| TJ max. | +150 °C - enables operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C |
| AEC-Q101 | Qualified - confirms reliability for automotive electronics per stress test requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). No polarity marking - bidirectional symmetry eliminates cathode/anode orientation requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One terminal of symmetrical P-N junction; accepts reverse surge in either direction |
| Cathode | Transient current exit (negative half-cycle) / entry (positive half-cycle) | Second terminal; completes bidirectional conduction path with Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a surges and IEC 61000-4-5 line transients in automotive ECUs |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices |
| AEC-Q101 qualified & halogen-free | Meets automotive supply chain requirements for reliability and environmental compliance (HM3 suffix) |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking preconditioning |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load dump and inductive kick. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector or IC input pins to shunt ESD and fast transients. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and transceivers by limiting voltage to ≤53.9 V during 10/1000 μs surges. | Use Scenario: Guarding differential CAN_H/CAN_L lines in factory automation nodes subject to cable discharge events and ground bounce. IC Role / Device Role / Timing Role: Symmetric transient suppressor across bus lines, absorbing common-mode and differential noise spikes. Use Value: Maintains signal integrity by clamping transients below ISO 11898-2 fault thresholds while adding <0.5 pF capacitance per line. |
| Consumer Power Adapter Input | Telecom DSL Line Interface |
Use Scenario: Secondary-side surge protection on 12 V/24 V DC outputs of wall adapters and PoE injectors. IC Role / Device Role / Timing Role: Final-stage clamp after primary-side MOV and filter, handling residual fast transients missed upstream. Use Value: Ensures downstream USB-C PD controllers or DC-DC regulators survive 1 kV/0.5 J surges per IEC 61000-4-5 Ed.3. | Use Scenario: Overvoltage protection on twisted-pair DSL line drivers and receivers in residential gateways. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed before line transformer or codec input. Use Value: Limits induced lightning surges to <54 V while preserving high-frequency DSL signal fidelity up to 30 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA | Lower PPPM (400 W), same SMB package, VBR = 40–44.2 V, non-AEC-Q101 | Not qualified for automotive; suitable for commercial-grade industrial or telecom use only | Select when AEC-Q101 is not required and cost sensitivity outweighs 33 % lower surge margin |
| SMCJ36CA | Higher PPPM (1500 W), larger SMC (DO-214AB) package, VBR = 40–44.2 V, AEC-Q101 available (HM3 variant) | Requires PCB layout change; better for high-energy transients like ISO 7637-2 Pulse 5a | Choose when system-level testing reveals insufficient margin with 600 W rating or board space permits larger footprint |
Compared with SMAJ36CA and SMCJ36CA, SM6T39CAHM3_B/H uniquely balances AEC-Q101 qualification, SMB footprint, and 600 W capability - making it optimal for space-constrained automotive modules where full SMC-level robustness is unnecessary.
Availability
SM6T39CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial CAN bus nodes, and consumer power adapter outputs requiring stable component supply with halogen-free, AEC-Q101-compliant TVS protection.
Supply support for SM6T39CAHM3_B/H 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with global manufacturing and testing infrastructure focused on reliability and automotive-grade performance.
The SM6T Series targets cost-sensitive, high-volume transient protection applications where SMB footprint, automated assembly compatibility, and AEC-Q101 qualification are mandatory - especially in body electronics and sensor interface circuits.
FAQ
What does the "CA" suffix indicate in SM6T39CAHM3_B/H?
The "CA" suffix denotes bidirectional configuration: SM6T39CAHM3_B/H conducts symmetrically in both polarities, unlike unidirectional variants (e.g., SM6T39AHM3_B/H). This allows single-device protection of AC signals, differential buses, or floating nodes without polarity constraints - confirmed in Vishay Document 88385 Section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SM6T39CAHM3_B/H suitable for automotive applications?
Yes, SM6T39CAHM3_B/H is AEC-Q101 qualified (per HM3 suffix and Document 88385 page 1), halogen-free, and RoHS-compliant. It meets automotive requirements for temperature cycling, humidity bias, and surge robustness - specifically intended for engine control, body electronics, and ADAS sensor interfaces where transient immunity is critical.
What is the clamping voltage of SM6T39CAHM3_B/H at rated peak pulse current?
The clamping voltage VC of SM6T39CAHM3_B/H is 53.9 V at IPPM = 11.1 A under 10/1000 μs waveform (Document 88385, Table "ELECTRICAL CHARACTERISTICS"). This value defines the maximum voltage imposed on protected circuitry during worst-case surge events.
How does the SMB package of SM6T39CAHM3_B/H affect thermal performance?
SM6T39CAHM3_B/H in SMB (DO-214AA) package has RθJA = 100 °C/W (Document 88385, "THERMAL CHARACTERISTICS"). When mounted on 5.0 mm × 5.0 mm copper pads, it supports 5.0 W continuous power dissipation at TA = 50 °C - sufficient for intermittent surge duty but requires derating above 25 °C per Fig. 2.
Does SM6T39CAHM3_B/H have polarity markings on the device body?
No, SM6T39CAHM3_B/H has no polarity markings because it is a bidirectional TVS. Unlike unidirectional SM6T parts (which feature a cathode band), the CA variant uses symmetrical internal structure - verified in Document 88385 "MECHANICAL DATA" section stating "no marking on bidirectional types".
SM6T39CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- 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)
SM6T39CAHM3_B/H FAQ
1.How can I place an order for SM6T39CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHM3_B/H 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 SM6T39CAHM3_B/H reliable?
The price and inventory of SM6T39CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T39CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHM3_B/H?
SM6T39CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHM3_B/H 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 SM6T39CAHM3_B/H?
For technical support, including SM6T39CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHM3_B/H requirements.
6.How does Aetrix verify that SM6T39CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHM3_B/H 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 SM6T39CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T39CAHM3_B/H?
All SM6T39CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHM3_B/H, 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 SM6T39CAHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T39CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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