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Vishay General Semiconductor - Diodes Division SM15T36A-E3/9AT
- Part No.:
- SM15T36A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T36A-E3/9AT.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,133
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Product details
Overview
SM15T36A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 36 V standoff voltage (VWM), 37.8 V minimum breakdown voltage (VBR), 49.9 V maximum clamping voltage at 30 A IPPM, 1500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification available via HE3 suffix variants. It protects automotive sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T36A-E3/9AT datasheet, SM15T36A-E3/9AT pinout, SM15T36A-E3/9AT application, or SM15T36A-E3/9AT equivalent, key selection criteria include clamping voltage under 30 A surge, unidirectional polarity with cathode band marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (34.2–37.8 V), it avalanches to divert transient energy away from downstream ICs or MOSFETs. Its low dynamic impedance ensures stable clamping at VC = 49.9 V under 10/1000 μs 30 A pulse, while thermal resistance RθJA = 75 °C/W supports operation up to TJ = 150 °C.
The device uses glass-passivated silicon junction technology for robust surge handling and meets J-STD-020 MSL Level 1 (260 °C peak reflow). Its unidirectional configuration requires correct cathode orientation during PCB layout, and failure mode under overstress is short-circuit - enabling fail-safe system design with upstream fusing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30.8 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for normal circuit bias. |
| VBR (Breakdown Voltage) | 34.2–37.8 V at 1.0 mA IT - Confirmed avalanche initiation range; ensures reliable turn-on before sensitive components exceed rating. |
| VC (Clamping Voltage) | 49.9 V at 30 A IPPM (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge; critical for I/O voltage margin. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains single high-energy transients like lightning surges or motor coil switching without degradation. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Negligible standby current; avoids battery drain or signal distortion in low-power sensor interfaces. |
| TJ max | 150 °C - Enables use in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with JEDEC-standard pick-and-place. |
Pinout & Package
SMC (DO-214AB) package: molded plastic body with two coplanar matte tin-plated leads; cathode identified by a visible band on the case end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal for rated IPPM performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to circuit ground or lowest potential point; completes conduction path during reverse transient. |
| Cathode | Protected line input | Connected to signal/power line being safeguarded; marked with band; carries full surge current into ground during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Handles lightning-surge-level threats without degradation, validated per IEC 61000-4-5 waveform. |
| Glass-passivated junction | Ensures long-term reliability and stable VBR over temperature and life cycle, critical for automotive deployments. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without popcorn or delamination risk during manufacturing. |
| AEC-Q101 qualification option | HE3/HM3 variants meet stress-test requirements for automotive electronics - not applicable to E3/9AT but confirms family capability. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on protected ICs - e.g., 3.3 V or 5 V logic interfaces remain within safe margins. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver signal lines and analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground, clamping transients within 1 ns response time. Use Value: Limits voltage to ≤49.9 V during 30 A surge, preventing latch-up or gate oxide damage in 3.3 V microcontrollers and analog front-ends. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring subject to relay contact bounce and solenoid coil de-energization spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each input channel, mounted directly at connector entry point. Use Value: Absorbs 1500 W pulses without derating at 85 °C ambient, eliminating need for external series impedance or additional filtering. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
Use Scenario: Shielding Ethernet PHY interface pins and PoE detection circuitry from ESD and induced surges on RJ45 ports in enterprise switches. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), providing fast-response clamping for sub-microsecond events. Use Value: Low 1.0 μA leakage preserves signal integrity on high-impedance bias networks; 49.9 V clamping aligns with 5 V PHY rail limits. |
Use Scenario: Securing optocoupler feedback path in isolated AC/DC adapters against transformer leakage inductance spikes during MOSFET switching. IC Role / Device Role / Timing Role: Unidirectional TVS across secondary-side error amplifier inputs to prevent false regulation or shutdown. Use Value: 30.8 V VWM allows operation with 24 V auxiliary supply rails; 1500 W rating handles repetitive 50 kHz switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A-E3/57T | Same VWM/VBR/VC specs but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 110 °C/W). | Not suitable for lightning-level threats; limited to board-level ESD or low-energy switching noise. | Select only if space-constrained and threat level is <500 W; verify thermal margin at 85 °C ambient. |
| SMCJ36A-E3/9AT | Identical SMC package, same VWM/VBR/VC, but rated for 3000 W PPPM (10/1000 μs); higher IPPM = 60 A. | Overqualified for typical 1500 W use cases; adds cost and board area without benefit unless dual-threshold protection is needed. | Choose only when legacy designs require backward compatibility with SMCJ series or when future-proofing against higher surge standards. |
Compared with SMAJ36A-E3/57T, SM15T36A-E3/9AT delivers double the surge energy handling in the same SMC footprint; versus SMCJ36A-E3/9AT, it offers optimal cost-performance balance for 1500 W-class protection without over-engineering.
Availability
SM15T36A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter feedback circuits requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SM15T36A-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 leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and high-power transient handling.
The SM15T Series was designed specifically for robust, high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SM15T36A-E3/9AT at its rated peak pulse current?
The SM15T36A-E3/9AT has a maximum clamping voltage (VC) of 49.9 V when subjected to a 10/1000 μs waveform at 30 A peak pulse current (IPPM), as specified in the Vishay datasheet revision 09-Jan-2024. This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T36A-E3/9AT maintains this clamping performance across its operational temperature range.
Is SM15T36A-E3/9AT suitable for automotive applications?
The SM15T36A-E3/9AT itself is RoHS-compliant commercial-grade; however, the SM15T family includes AEC-Q101 qualified variants (e.g., SM15T36AHE3_A/I) with identical electrical specs and enhanced reliability testing. For automotive use, designers should select the HE3 or HM3 suffix versions - the SM15T36A-E3/9AT is appropriate for non-safety-critical subsystems or prototyping where qualification is pending. The SM15T36A-E3/9AT shares the same SMC package, VWM, and clamping behavior as qualified variants.
What does the "E3/9AT" suffix indicate in SM15T36A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability standards. The "9AT" indicates packaging in a 13-inch diameter plastic tape-and-reel format containing 3500 units, optimized for high-volume SMT assembly. This differs from "57T" (7-inch reel, 850 units) and confirms the SM15T36A-E3/9AT is configured for automated production lines requiring bulk feeding.
How does SM15T36A-E3/9AT compare to bidirectional TVS diodes like SM15T36CA?
The SM15T36A-E3/9AT is unidirectional and features a cathode band for polarity-sensitive placement, whereas SM15T36CA is bidirectional with no polarity marking and symmetric clamping in both directions. Both share identical VWM (30.8 V), VBR (34.2–37.8 V), and VC (49.9 V), but the SM15T36A-E3/9AT must be oriented correctly to protect DC-biased lines - making it ideal for 24 V sensor feeds or power-rail protection. The SM15T36A-E3/9AT cannot replace bidirectional types in AC-coupled or floating signal paths.
What is the thermal resistance of SM15T36A-E3/9AT, and how does it affect layout?
The SM15T36A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes minimal trace length and direct thermal coupling - reducing pad size or adding thermal relief will increase RθJA and risk exceeding TJ max = 150 °C during repeated surges. Layouts for the SM15T36A-E3/9AT must maintain full copper exposure under both terminals to sustain rated 1500 W pulse performance.
SM15T36A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 30A
- 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)
SM15T36A-E3/9AT FAQ
1.How can I place an order for SM15T36A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T36A-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 SM15T36A-E3/9AT reliable?
The price and inventory of SM15T36A-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 SM15T36A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T36A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T36A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T36A-E3/9AT?
SM15T36A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T36A-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 SM15T36A-E3/9AT?
For technical support, including SM15T36A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T36A-E3/9AT requirements.
6.How does Aetrix verify that SM15T36A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T36A-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 SM15T36A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T36A-E3/9AT?
All SM15T36A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T36A-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 SM15T36A-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T36A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T36A-E3/9AT Tags
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