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Vishay General Semiconductor - Diodes Division SM15T39CAHE3_A/H
- Part No.:
- SM15T39CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CAHE3_A/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
SM15T39CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR), and 53.9 V maximum clamping voltage (VC) at IPPM. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T39CAHE3_A/H datasheet, SM15T39CAHE3_A/H pinout, SM15T39CAHE3_A/H application, or SM15T39CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low clamping ratio (VC/VBR ≈ 1.38), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, delivering consistent clamping performance regardless of transient polarity. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and robust surge endurance under repeated 10/1000 μs waveforms up to IPPM = 28.0 A.
Designed for high-impedance source environments, it relies on system-level source impedance to limit current within its 1500 W PPPM rating. Failure mode under overstress is a short circuit - a fail-safe behavior critical for automotive and industrial safety-critical protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin for protected line. |
| VBR (min/max) | 37.1 V / 41.0 V - Measured at 1.0 mA IT; ensures predictable turn-on threshold across temperature and unit variation. |
| VC @ IPPM | 53.9 V - Clamped voltage at 28.0 A peak pulse (10/1000 μs); determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; qualifies for lightning surge immunity per IEC 61000-4-5 Level 4. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, and ESD testing; supports PPAP documentation. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard 8 mm × 8 mm copper pads; informs derating above TA = 25 °C. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case meeting UL 94 V-0. Matte tin-plated leads, J-STD-002 solderable. No polarity marking - bidirectional device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical P-N junction; accepts surge current in either direction without polarity dependence. |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical P-N junction; identical electrical role to Anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, RS-485, sensor bridges) without polarity concerns. |
| 1500 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive equipment with minimal layout overhead. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics requiring long-term field reliability. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V supply domains. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity limitations or baking requirements. |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine bay or chassis modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input or signal conditioner. Use Value: Limits transient excursions to ≤53.9 V, preventing latch-up or gate oxide damage in 5 V-tolerant analog front-ends while maintaining signal integrity. |
Use Scenario: Shielding PLC digital input channels connected to 24 V field wiring subject to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Primary surge suppression device mounted at connector entry point, upstream of optocoupler or level-shifter. Use Value: Absorbs 1500 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5, reducing field failure rates in factory automation systems. |
| Telecom Interface Protection | Consumer Device Power Rail Clamp |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links subjected to lightning-induced common-mode surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, providing symmetrical clamping on differential bus. Use Value: Maintains <1.5 V differential noise margin during 1 kV/1.2/50 μs surge events by limiting common-mode excursion to ≤53.9 V on each line. |
Use Scenario: Clamping 12 V DC input rails in smart home hubs where external adapters may introduce switching transients or hot-plug spikes. IC Role / Device Role / Timing Role: Secondary overvoltage protector downstream of primary DC-DC converter, guarding against upstream regulator fault conditions. Use Value: Activates within nanoseconds at 37.1 V, clamping rail to 53.9 V to prevent catastrophic failure of USB-PD controllers and PMICs rated for 20 V max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA | Lower PPPM (400 W), higher VWM (36 V), same SMC package but non-AEC-Q101 rated. | Suitable for cost-sensitive commercial equipment where automotive qualification is unnecessary and surge threat level is lower. | Select SMAJ36CA only if system-level surge testing confirms 400 W sufficiency and AEC-Q101 is not required. |
| SMCJ36CA | Higher PPPM (1500 W), identical VWM/VBR/VC specs, AEC-Q101 available (SMCJ36CAHE3), but larger SMC package footprint (same DO-214AB outline). | Offers identical protection performance with proven automotive pedigree; used where board space allows or legacy design migration is needed. | SMCJ36CAHE3 is a direct functional match with identical ratings - preferred when existing designs use SMCJ-series footprints or require extended lifetime validation data. |
Compared with SM15T39CAHE3_A/H, SMAJ36CA offers reduced surge margin and no automotive qualification, while SMCJ36CAHE3 delivers identical electrical performance with broader automotive validation history and identical mechanical compatibility - making it the most conservative drop-in alternative for mission-critical deployments.
Availability
SM15T39CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, telecom RS-485 interfaces, and consumer DC power rail protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SM15T39CAHE3_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, power efficiency, and automotive-grade qualification.
The SM15T Series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in SM15T39CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration - meaning SM15T39CAHE3_A/H provides symmetrical clamping for both positive and negative transients without polarity dependency. Unlike unidirectional "A" variants, it has no cathode band marking and is used where AC signals, differential buses, or floating references require equal protection in both directions.
Is SM15T39CAHE3_A/H compliant with AEC-Q101, and what does that cover?
Yes, SM15T39CAHE3_A/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay's official documentation. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), electrostatic discharge (HBM/MM), and surge robustness - validating suitability for automotive electronic control units and sensor modules.
What is the maximum clamping voltage of SM15T39CAHE3_A/H, and how is it measured?
The maximum clamping voltage of SM15T39CAHE3_A/H is 53.9 V, measured at 28.0 A peak pulse current (IPPM) using a standardized 10/1000 μs double-exponential waveform. This value represents the highest voltage the device allows across its terminals during worst-case surge events, directly determining stress on downstream components.
Can SM15T39CAHE3_A/H replace unidirectional TVS diodes like SM15T39AHE3_A/H in existing designs?
No - SM15T39CAHE3_A/H is bidirectional and lacks polarity marking, whereas SM15T39AHE3_A/H is unidirectional with a defined cathode band. Substitution requires verifying circuit topology: bidirectional use (e.g., AC lines, differential pairs) permits replacement; DC-biased rails with defined anode/cathode orientation do not, as reverse conduction would cause malfunction or shorting.
What PCB pad layout is recommended for optimal thermal and surge performance of SM15T39CAHE3_A/H?
Vishay specifies mounting SM15T39CAHE3_A/H on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated PPPM and thermal resistance (RθJA = 75 °C/W). Smaller pads reduce surge capability and increase junction temperature - derating curves in Figure 2 must be applied if using reduced copper area.
SM15T39CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, 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):
- 28A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SM15T39CAHE3_A/H FAQ
1.How can I place an order for SM15T39CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CAHE3_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 SM15T39CAHE3_A/H reliable?
The price and inventory of SM15T39CAHE3_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 SM15T39CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SM15T39CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CAHE3_A/H?
SM15T39CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CAHE3_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 SM15T39CAHE3_A/H?
For technical support, including SM15T39CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CAHE3_A/H requirements.
6.How does Aetrix verify that SM15T39CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T39CAHE3_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 SM15T39CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SM15T39CAHE3_A/H?
All SM15T39CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CAHE3_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 SM15T39CAHE3_A/H part is unused and in its original packaging.
Return procedure for SM15T39CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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