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Vishay General Semiconductor - Diodes Division SM15T27AHE3/9AT
- Part No.:
- SM15T27AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27AHE3/9AT.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM15T27AHE3/9AT from Vishay General Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) in SMC (DO-214AB) package, featuring 27 V standoff voltage (VWM = 23.1 V), 37.5 V clamping voltage at 40 A peak pulse current, and AEC-Q101 qualification for automotive use. It protects MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive powertrain and body electronics.
For engineers reviewing the SM15T27AHE3/9AT datasheet, SM15T27AHE3/9AT pinout, SM15T27AHE3/9AT application, or SM15T27AHE3/9AT equivalent, key selection criteria include verified clamping performance under 10/1000 μs waveform, unidirectional polarity with cathode band marking, AEC-Q101 qualification status, and SMC package thermal resistance (RθJA = 75 °C/W) for board-level thermal design.
Technical Context
The SM15T27AHE3/9AT employs a glass-passivated silicon junction optimized for low-inductance transient suppression. Its breakdown voltage (VBR = 25.7–28.4 V at 1 mA) ensures precise triggering above system operating voltage while maintaining low leakage (<1 μA at 23.1 V).
Designed for high-energy threat environments, it delivers 1500 W peak pulse power (10/1000 μs) with a maximum clamping voltage of 37.5 V at 40 A IPPM, enabling robust protection of 24 V automotive rails without over-clamping sensitive downstream components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 23.1 V - Maximum continuous reverse voltage before conduction; sets operating margin for 24 V nominal systems. |
| VBR (Breakdown Voltage) | 25.7–28.4 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients without premature leakage. |
| VC (Clamping Voltage) | 37.5 V at IPPM = 40 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge; limits stress on 36 V-rated components. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capability for lightning and inductive switching threats per IEC 61000-4-5 Level 4 compliance paths. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments with sustained ambient temperatures up to +125 °C. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic modules per stress test requirements including HTGB, HTRB, and temperature cycling. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Provides return path during transient clamping; must be routed with low-inductance trace to minimize voltage overshoot. |
| Cathode | Current exit terminal in reverse bias; connected to protected line (e.g., 24 V rail or signal) | Marked by visible band; defines polarity-sensitive placement-reversal causes permanent short-circuit failure. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 4 kV/2 Ω surge on 24 V supply lines without cascaded TVS stages. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on downstream FETs and controllers during fast transients, preserving safe operating area. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture ingress or contamination. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without preconditioning or special handling; compatible with automated placement. |
| AEC-Q101 qualification (HE3 suffix) | Validates reliability for automotive power distribution modules, junction boxes, and ADAS sensor interfaces per AEC stress protocols. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 24 V switched inputs from relay coil flyback and load dump events in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to clamp negative transients and limit positive overvoltage. Use Value: Prevents latch-up or gate oxide damage in input buffer ICs and microcontrollers during 100 V/50 ms load dump pulses. |
Use Scenario: Shields 24 V digital input channels of programmable logic controllers from inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Primary transient suppressor on field-side I/O traces, upstream of optocoupler or Schmitt trigger input stage. Use Value: Maintains signal integrity by limiting transient-induced false triggering and extends mean time between failures (MTBF) in harsh EMI environments. |
| Automotive Power Distribution Unit (PDU) | Telecom DC Power Feeder Protection |
Use Scenario: Installed on 24 V main feed lines in battery disconnect units to absorb energy from alternator load dump surges. IC Role / Device Role / Timing Role: High-power clamping device parallel to system rail, activated within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤37.5 V during 120 V/400 ms transients, preventing catastrophic failure of downstream DC-DC converters and CAN transceivers. |
Use Scenario: Safeguards remote radio unit (RRU) power inputs against induced surges from nearby lightning strikes on telecom tower cabling. IC Role / Device Role / Timing Role: First-line defense on -48 V DC feeder lines, coordinated with upstream GDTs for staged protection. Use Value: Handles 1500 W surge energy without degradation, ensuring uninterrupted operation of base station equipment per ITU-T K.20/21 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T | Lower PPPM (400 W), higher VWM (24 V), same SMC package but non-AEC-Q101 rated | Limited to commercial-grade industrial or consumer applications; insufficient for automotive load dump compliance | Select when cost sensitivity outweighs automotive qualification and 1500 W surge headroom is unnecessary |
| SMCJ24A-QH | Same 1500 W rating and AEC-Q101 qualification, but VWM = 24 V and VC = 38.9 V at 38.8 A | Marginally higher clamping voltage; identical automotive use case coverage but slightly reduced overvoltage margin | Prefer when tighter VWM tolerance (±5 % vs. ±10 %) and extended production continuity are prioritized over minimal clamping reduction |
Compared with SMAJ24A-E3/57T and SMCJ24A-QH, the SM15T27AHE3/9AT provides optimal balance of 23.1 V standoff margin for 24 V systems, 37.5 V clamping ceiling, and full AEC-Q101 validation-making it the preferred choice for new automotive designs requiring robust, qualified transient immunity.
Availability
SM15T27AHE3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom DC feeder applications requiring stable component supply across multi-year production cycles.
Supply support for SM15T27AHE3/9AT 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, precision, and automotive-grade qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in automotive and industrial 12–220 V systems, combining AEC-Q101 validation, low-inductance packaging, and tightly controlled clamping performance.
FAQ
What is the clamping voltage of the SM15T27AHE3/9AT at its rated peak pulse current?
The SM15T27AHE3/9AT has a maximum clamping voltage (VC) of 37.5 V when subjected to a 10/1000 μs waveform at its peak pulse current (IPPM) of 40 A. This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal and is guaranteed across the full operating temperature range. The SM15T27AHE3/9AT maintains this clamping performance without degradation after repeated surge events within its specified ratings.
Is the SM15T27AHE3/9AT suitable for automotive applications?
Yes, the SM15T27AHE3/9AT is AEC-Q101 qualified, as confirmed by its HE3 suffix and Vishay documentation (Document Number 88380, Revision 09-Jan-2024). It meets stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling-making it appropriate for under-hood and chassis-mounted automotive modules. The SM15T27AHE3/9AT is explicitly recommended for BCM, PDU, and ADAS sensor protection.
What does the "HE3" suffix indicate in SM15T27AHE3/9AT?
The "HE3" suffix in SM15T27AHE3/9AT denotes RoHS-compliant construction and AEC-Q101 qualification. Per Vishay's ordering nomenclature, "HE3" identifies the automotive-grade version with halogen-free molding compound, matte tin-plated leads, and full qualification per AEC-Q101 Rev D. The "9AT" denotes 13-inch tape-and-reel packaging with 3500 units per reel. The SM15T27AHE3/9AT is not interchangeable with commercial-grade "E3" variants lacking automotive validation.
How does the SM15T27AHE3/9AT differ from bidirectional TVS diodes like SM15T27CA?
The SM15T27AHE3/9AT is unidirectional and features a cathode band for polarity-sensitive placement; it conducts only during reverse overvoltage events and blocks forward current. In contrast, SM15T27CA is bidirectional, symmetrical, and lacks polarity marking-suitable for AC or differential signal lines. The SM15T27AHE3/9AT offers lower leakage (<1 μA at 23.1 V) and is preferred for DC rail protection where polarity is fixed and leakage must be minimized.
What is the thermal resistance of the SM15T27AHE3/9AT, and how does it affect PCB layout?
The SM15T27AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under 6.5 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks. Reducing pad size below the recommended layout increases RθJA and risks thermal runaway during repetitive surges. The SM15T27AHE3/9AT requires no additional heatsink for typical automotive pulse duty cycles.
SM15T27AHE3/9AT 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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)
SM15T27AHE3/9AT FAQ
1.How can I place an order for SM15T27AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27AHE3/9AT 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 SM15T27AHE3/9AT reliable?
The price and inventory of SM15T27AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T27AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27AHE3/9AT?
SM15T27AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27AHE3/9AT 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 SM15T27AHE3/9AT?
For technical support, including SM15T27AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27AHE3/9AT requirements.
6.How does Aetrix verify that SM15T27AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T27AHE3/9AT 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 SM15T27AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T27AHE3/9AT?
All SM15T27AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27AHE3/9AT, 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 SM15T27AHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T27AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T27AHE3/9AT Tags
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