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Vishay General Semiconductor - Diodes Division SM15T30CA-E3/9AT
- Part No.:
- SM15T30CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T30CA-E3/9AT.pdf
- Description:
- TVS DIODE 25.6VWM 41.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,847
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Product details
Overview
SM15T30CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 30 V standoff voltage (VWM), and clamping voltage of 41.5 V at 36 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T30CA-E3/9AT datasheet, SM15T30CA-E3/9AT pinout, SM15T30CA-E3/9AT application, or SM15T30CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3 suffix), low clamping ratio (1.38×VWM), and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 34.2 V min / 37.8 V max under 1 mA test current, and reverse leakage ≤1.0 μA at 30 V standoff. Its failure mode under overstress is short-circuit, ensuring system-level fault containment.
Thermal performance is defined by RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), supporting operation from –65 °C to +150 °C junction temperature. The device meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 34.2 V / 37.8 V at 1 mA - Ensures reliable triggering above VWM with margin; defines minimum clamping onset threshold. |
| VC @ IPPM | 41.5 V at 36 A (10/1000 μs) - Clamped voltage during worst-case surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak transient energy handling capacity; validates suitability for lightning surge (IEC 61000-4-5 Level 4). |
| IPPM | 36 A - Peak surge current capability under standardized 10/1000 μs waveform; used to size series impedance. |
| TJ range | –65 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments without derating. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002. No polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Carries surge current into device during negative polarity transients; connects to protected line. |
| Cathode | Transient current entry (positive half-cycle) | Carries surge current into device during positive polarity transients; connects to protected line. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 1500 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive front-end interfaces. |
| Low clamping ratio (1.38×VWM) | Minimizes overvoltage exposure to downstream MOSFETs or interface ICs during transient events. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity limitations or baking. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime and temperature cycling in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs during 100 V/100 A load-dump events per ISO 7637-2. |
Use Scenario: Safeguarding RS-485/RS-232 communication ports and PLC digital input channels exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary transient suppression element on differential pair or single-ended signal line, mounted adjacent to connector. Use Value: Maintains signal integrity under 4 kV EFT (IEC 61000-4-4) and 2 kV surge (IEC 61000-4-5) without adding capacitance-induced timing skew. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
Use Scenario: Secondary-side DC bus protection in USB PD and AC/DC adapters against coupling from primary-side transients. IC Role / Device Role / Timing Role: Clamp device across +VOUT/GND rail to limit overvoltage during fast-rising output faults or feedback loop failure. Use Value: Limits peak voltage to ≤41.5 V, preventing overvoltage shutdown or damage to downstream DC-DC controllers and load switches. |
Use Scenario: Overvoltage protection on POTS line interface circuits in VoIP gateways and DSLAM line cards. IC Role / Device Role / Timing Role: Bidirectional suppressor bridging tip/ring lines to ground, absorbing longitudinal surges induced by nearby power lines. Use Value: Withstands repeated 1500 W surges while maintaining <1 μA leakage at 30 V, preserving line impedance and voice signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Lower peak power (600 W), smaller SMB package (DO-214AA), VC = 53.3 V @ 11.3 A | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy threats like ESD or EFT. | Select when board space is constrained and surge threat level is ≤1 kV/500 A. |
| SMCJ33CA | Same SMC package, higher peak power (3000 W), VC = 53.3 V @ 56.3 A, VWM = 33 V | Clamps at higher voltage (53.3 V), requiring wider voltage margin for protected ICs. | Choose when system must survive repeated 4 kV surges and downstream devices tolerate ≥53 V transient exposure. |
Compared with SM15T30CA-E3/9AT, SMBJ33CA offers footprint reduction but sacrifices 60% peak power handling, while SMCJ33CA doubles power rating at the cost of 28% higher clamping voltage-requiring careful trade-off between robustness and voltage margin.
Availability
SM15T30CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O terminals, and telecom line card designs requiring stable component supply with RoHS-compliant, commercial-grade reliability.
Supply support for SM15T30CA-E3/9AT 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 supplier of discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on high-reliability, AEC-Q101-qualified components.
The SM15T Series is designed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure, balancing low clamping voltage, high surge capability, and SMT manufacturability.
FAQ
What is the clamping voltage of SM15T30CA-E3/9AT at its rated peak pulse current?
The SM15T30CA-E3/9AT has a maximum clamping voltage (VC) of 41.5 V when subjected to its rated peak pulse current of 36 A under the standardized 10/1000 μs waveform. This value is measured across the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance is guaranteed across the full operating temperature range and is critical for ensuring downstream ICs remain within safe absolute maximum ratings.
Is SM15T30CA-E3/9AT qualified for automotive applications?
The base part number SM15T30CA-E3/9AT is RoHS-compliant and commercial-grade; it is not AEC-Q101 qualified. However, Vishay offers automotive-grade variants under ordering codes SM15T30CAHE3_A/I (with HE3 suffix) that meet AEC-Q101 stress testing requirements. For automotive use, SM15T30CA-E3/9AT must be replaced with the HE3-suffixed version-no PCB layout change is needed as both share identical SMC (DO-214AB) package dimensions and pinout.
How does the bidirectional configuration of SM15T30CA-E3/9AT affect its circuit placement?
SM15T30CA-E3/9AT has no polarity marking and functions identically in both directions, allowing direct placement across any two-node interface-such as differential signal pairs, AC-coupled lines, or floating power rails-without regard to orientation. This eliminates risk of incorrect installation during assembly and simplifies schematic symbol usage, as a single bidirectional symbol suffices. Its symmetrical VBR and VC ensure consistent protection regardless of transient polarity.
What is the thermal resistance of SM15T30CA-E3/9AT, and how does it impact power dissipation?
The SM15T30CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values assume mounting on 8.0 mm × 8.0 mm copper pads per terminal. Under continuous DC conditions, the 6.5 W power dissipation rating is derated above 25 °C ambient; at 85 °C ambient, usable power drops to ~3.9 W. Transient surge handling remains unaffected as energy is dissipated in microseconds.
Can SM15T30CA-E3/9AT replace unidirectional TVS diodes in existing designs?
SM15T30CA-E3/9AT can replace unidirectional TVS diodes only if the circuit topology supports bidirectional clamping-i.e., when the protected node is referenced to ground and not biased with a fixed DC potential that would forward-bias one direction continuously. In such cases, using SM15T30CA-E3/9AT avoids polarity errors during assembly but requires verification that reverse leakage (<1 μA at 30 V) does not disrupt bias networks. It is not a drop-in replacement for unidirectional devices in DC-biased signal paths.
SM15T30CA-E3/9AT 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.5V
- Current - Peak Pulse (10/1000µs):
- 36A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T30CA-E3/9AT FAQ
1.How can I place an order for SM15T30CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T30CA-E3/9AT 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 SM15T30CA-E3/9AT reliable?
The price and inventory of SM15T30CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T30CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T30CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T30CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T30CA-E3/9AT?
SM15T30CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T30CA-E3/9AT 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 SM15T30CA-E3/9AT?
For technical support, including SM15T30CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T30CA-E3/9AT requirements.
6.How does Aetrix verify that SM15T30CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T30CA-E3/9AT 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 SM15T30CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T30CA-E3/9AT?
All SM15T30CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T30CA-E3/9AT, 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 SM15T30CA-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T30CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T30CA-E3/9AT Tags
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