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Vishay General Semiconductor - Diodes Division SM6T39CAHE3_A/H
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- Part No.:
- SM6T39CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHE3_A/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,220
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Product details
Overview
SM6T39CAHE3_A/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 provides robust protection for automotive sensor signal lines against ESD and inductive switching transients.
For engineers reviewing the SM6T39CAHE3_A/H datasheet, SM6T39CAHE3_A/H pinout, SM6T39CAHE3_A/H application, or SM6T39CAHE3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.38), TJ max. of +150 °C, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical VBR, VWM (33.3 V), and ID (1.0 μA) specifications for forward and reverse directions. Its glass-passivated junction ensures stable leakage and long-term reliability under thermal cycling.
The device delivers 600 W peak pulse power per 10/1000 μs waveform, clamps to ≤53.9 V at 11.1 A IPPM, and exhibits low dynamic impedance (αT = 10.0 × 10−4/°C), enabling precise overvoltage limiting in fast-rising transients up to 100 ns rise time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines reliable conduction onset across temperature and unit variation |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - peak clamped voltage protecting downstream ICs from overshoot |
| PPPM | 600 W - surge energy handling capacity for automotive load-dump and ISO 7637-2 pulse 5a |
| TJ max. | +150 °C - enables operation in under-hood automotive environments without derating |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.20 mm height and 5.59 mm length |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTGB, TCT, and HTRB stress tests |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode side marking) | Not applicable - bidirectional device has no polarity marking | No band or marking; terminals are functionally symmetric for AC transient suppression |
| Anode (Cathode side marking) | Not applicable - bidirectional device has no polarity marking | Both terminals behave identically; clamping occurs regardless of voltage polarity direction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and leakage in both directions - eliminates need for polarity-aware layout in differential or AC-coupled lines |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, high-temperature reverse bias, and humidity testing - supports Tier-1 BOM inclusion |
| 600 W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge events without degradation |
| Low clamping ratio | VC/VBR ≈ 1.38 - minimizes overvoltage stress on protected ICs compared to higher-ratio alternatives |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH - simplifies SMT line logistics and eliminates bake requirements |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs from inductive kickback and battery transient coupling in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp ±100 V transients before reaching signal conditioning amplifier. Use Value: Prevents latch-up or permanent damage to analog front-end ICs while maintaining signal integrity below 33.3 V normal operation. | Use Scenario: Safeguarding CANH/CANL differential pair against ESD (IEC 61000-4-2 ±15 kV) and burst noise in factory automation gateways. IC Role / Device Role / Timing Role: One SM6T39CAHE3_A/H per line (CANH and CANL), leveraging symmetric clamping to preserve differential voltage margin during common-mode surges. Use Value: Maintains CAN physical layer compliance by limiting common-mode excursion to ≤53.9 V, avoiding bus lockup or bit errors. |
| Consumer USB Port ESD Protection | Telecom DSL Line Transient Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in set-top boxes exposed to user-handling events. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF typical at 0 V) placed after primary polymer fuse to absorb ±8 kV contact discharge. Use Value: Clamps transients within 1 ns response time without distorting 480 Mbps data eye, verified per USB-IF ESD test plan. | Use Scenario: Front-end surge protection on ADSL/VDSL line cards subjected to lightning-induced longitudinal surges up to 1 kV. IC Role / Device Role / Timing Role: Bidirectional clamp across tip/ring pair, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Limits let-through voltage to <54 V during 10/1000 μs surges, preventing damage to line driver ICs rated for 55 V absolute max. |
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 (600 W), but SMA package (DO-214AC); RθJA = 120 °C/W vs. 100 °C/W for SMB | Lower power density due to larger thermal resistance; less suitable for high-density automotive PCBs with limited copper area | Select SMAJ39CA only if legacy SMA footprint exists and thermal margin ≥15 °C is available. |
| 1.5KE39CA | Higher PPPM (1500 W), axial leaded DO-201AD package; VC = 60.7 V at 24.7 A - 12.6% higher clamping voltage | Not SMT-compatible; requires through-hole assembly and board real estate; unsuitable for automated production or space-constrained designs | Choose 1.5KE39CA only for prototyping or low-volume industrial equipment where manual assembly is acceptable. |
Compared with SMAJ39CA and 1.5KE39CA, SM6T39CAHE3_A/H offers superior thermal performance (RθJA = 100 °C/W), AEC-Q101 qualification, and SMB footprint compatibility with high-speed SMT lines - making it the preferred choice for volume automotive and industrial electronics requiring zero rework risk and guaranteed supply continuity.
Availability
SM6T39CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interface, and telecom DSL line transient suppression requiring stable component supply, AEC-Q101 compliance, and RoHS/halogen-free assurance.
Supply support for SM6T39CAHE3_A/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The SM6T Series is designed specifically for surface-mount transient voltage suppression in harsh environments, targeting automotive, industrial, and telecom applications where bidirectional clamping, AEC-Q101 qualification, and consistent surge immunity are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T39CAHE3_A/H?
The "CA" suffix in SM6T39CAHE3_A/H denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. Unlike unidirectional variants (e.g., SM6T39A), SM6T39CAHE3_A/H has no cathode marking and clamps equally for positive and negative transients - essential for protecting AC-coupled or differential signal paths such as CAN bus or sensor bridges.
Is SM6T39CAHE3_A/H qualified for automotive applications?
Yes, SM6T39CAHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure ("HE3" suffix) and documentation (Document Number 88385, Revision 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for under-hood and body-control module deployments.
What is the maximum clamping voltage of SM6T39CAHE3_A/H under standard test conditions?
The maximum clamping voltage (VC) of SM6T39CAHE3_A/H is 53.9 V when subjected to a 10/1000 μs peak pulse current of 11.1 A, measured per Figure 1 in Vishay Document 88385. This value represents the worst-case voltage seen by protected circuitry during surge events and is critical for ensuring downstream ICs remain within their absolute maximum ratings.
How does the SMB (DO-214AA) package of SM6T39CAHE3_A/H compare thermally to SMA (DO-214AC)?
SM6T39CAHE3_A/H in SMB package has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W, versus ~120 °C/W for SMA-packaged equivalents like SMAJ39CA. This 20% lower thermal resistance allows SM6T39CAHE3_A/H to sustain higher average power dissipation or operate reliably in tighter thermal envelopes - especially important in densely populated automotive PCBs with limited copper area.
Does SM6T39CAHE3_A/H require special PCB layout considerations?
Yes - Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W pulse power. Traces must be short and wide to minimize inductance; ground and power planes should be solid beneath the device. Avoid thermal relief on pads, and ensure solder mask defined (SMD) stencil apertures match the SMB outline to prevent bridging or insufficient solder volume for mechanical reliability.
SM6T39CAHE3_A/H 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:
- -
- 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_A/H FAQ
1.How can I place an order for SM6T39CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHE3_A/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 SM6T39CAHE3_A/H reliable?
The price and inventory of SM6T39CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T39CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHE3_A/H?
SM6T39CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHE3_A/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 SM6T39CAHE3_A/H?
For technical support, including SM6T39CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHE3_A/H requirements.
6.How does Aetrix verify that SM6T39CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHE3_A/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 SM6T39CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T39CAHE3_A/H?
All SM6T39CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHE3_A/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 SM6T39CAHE3_A/H part is unused and in its original packaging.
Return procedure for SM6T39CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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