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Vishay General Semiconductor - Diodes Division SM15T27CAHM3/H
- Part No.:
- SM15T27CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T27CAHM3/H.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,182
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Product details
Overview
SM15T27CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 23.1 V stand-off voltage (VWM), 25.7–28.4 V breakdown voltage (VBR), and clamping to ≤37.5 V at 40.0 A peak pulse current - used to protect automotive sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T27CAHM3/H datasheet, SM15T27CAHM3/H pinout, SM15T27CAHM3/H application, or SM15T27CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.35), and compatibility with high-impedance transient sources in automotive ECUs and industrial I/O interfaces.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 μA reverse leakage at 23.1 V, then rapidly avalanches symmetrically in both directions when transient voltage exceeds 25.7 V (min VBR). Its low-inductance SMC package enables sub-100 ps response time to fast-rising transients.
The SM15T27CAHM3/H is thermally rated for TJ = –65 °C to +150 °C, with RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation on standard PCB copper pads without heatsinking for single-event surge conditions per IEC 61000-4-5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 23.1 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit DC bias. |
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - guaranteed avalanche onset range; defines minimum overvoltage threshold for clamping activation. |
| VC @ IPPM | 37.5 V at 40.0 A (10/1000 μs) - clamped voltage during worst-case surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling with 10/1000 μs waveform; qualifies for Level 4 IEC 61000-4-5 (4 kV) testing. |
| IPPM | 40.0 A - peak pulse current capacity; defines minimum system source impedance required to avoid exceeding rating. |
| TJ max | +150 °C - maximum junction temperature; supports under-hood automotive placement with derated power above 25 °C. |
| Package | SMC (DO-214AB) - surface-mount, low-profile package with 8.0 mm × 8.0 mm copper pad thermal requirement per terminal. |
Pinout & Package
SM15T27CAHM3/H uses a bidirectional SMC (DO-214AB) package with no polarity marking; both terminals are symmetrical and interchangeable. The device has two terminals only - no cathode/anode designation applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | AC input / bidirectional line connection | Connected across protected differential or single-ended signal path; conducts equally in either direction during overvoltage. |
| Terminal 2 | AC input / bidirectional line connection | Second side of differential pair or ground-referenced line; completes symmetrical clamping path with Terminal 1. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards - suitable for engine control, ADAS sensors, and body electronics. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL level 1 (peak reflow 260 °C) and JESD201 class 2 whisker resistance - supports lead-free manufacturing and environmental compliance. |
| 1500 W peak pulse power | Withstands 4 kV IEC 61000-4-5 surge events when system source impedance limits current to ≤40 A - eliminates need for series impedance matching in many I/O protection designs. |
| Low clamping ratio | VC/VBR ≈ 1.35 ensures minimal overvoltage overshoot during clamping - protects 3.3 V and 5 V logic interfaces without additional series resistors or TVS staging. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) in engine control modules from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly across sensor output and ground, responding within nanoseconds to voltage excursions beyond 23.1 V. Use Value: Prevents latch-up or permanent damage to 12-bit ADC inputs and microcontroller GPIOs by limiting transient voltage to ≤37.5 V at 40 A. |
Use Scenario: Safeguarding RS-485 transceiver data lines in factory automation PLCs exposed to motor drive noise and relay coil kickback. IC Role / Device Role / Timing Role: Differential-line TVS connected between A/B lines and ground, suppressing common-mode surges up to 4 kV while maintaining signal integrity. Use Value: Enables robust communication over 1200 m cable runs without repeaters by clamping transients before they corrupt differential signaling thresholds. |
| Telecom Power Interface | Consumer Device USB Port |
Use Scenario: Shielding 48 V PoE-powered Ethernet ports in network switches from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary-level bidirectional clamp on PSE-side power pairs, coordinated with secondary TVS and gas discharge tubes in multi-stage protection. Use Value: Absorbs >90% of 1500 W surge energy without degradation, preserving upstream DC-DC converter and PHY IC reliability over 10-year field life. |
Use Scenario: Guarding USB 2.0 D+/D− lines in portable medical monitors against ESD events (>8 kV contact) and hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) bidirectional TVS placed adjacent to connector, minimizing signal distortion on 480 Mbps data paths. Use Value: Maintains USB eye diagram compliance while reducing failure rate from ESD-induced firmware lockups by >99.7% in production testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24CA | 24 V VWM, 26.7–29.5 V VBR, 38.9 V VC @ 38.6 A, same SMC package, not AEC-Q101 qualified | Lower clamping voltage margin (38.9 V vs. 37.5 V) and no automotive qualification - suitable for commercial industrial use only | Select when AEC-Q101 is not required and tighter VWM tolerance (±5%) is preferred over automotive validation. |
| ON Semiconductor 1.5KE27CA | 27 V VWM, 29.9–33.0 V VBR, 43.0 V VC @ 34.9 A, DO-204AB (Axial) package, higher VC/VBR ratio | Through-hole mounting, 5.5 V higher clamping voltage, incompatible with automated SMT assembly | Choose only for legacy through-hole designs where board real estate allows axial components and clamping performance margin is acceptable. |
Compared with SMAJ24CA and 1.5KE27CA, SM15T27CAHM3/H delivers lower clamping voltage, AEC-Q101 validation, halogen-free construction, and optimized SMT thermal performance - making it the preferred choice for new automotive and high-reliability industrial designs requiring zero rework on solder paste profile or layout.
Availability
SM15T27CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, telecom power entry points, and consumer USB port hardening requiring stable component supply across long-life production programs.
Supply support for SM15T27CAHM3/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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM15T Series was developed specifically for high-power, bidirectional transient suppression in harsh environments - targeting AEC-Q101-compliant automotive subsystems and industrial equipment subject to lightning and inductive switching threats.
FAQ
What does the "HM3" suffix indicate in SM15T27CAHM3/H?
The "HM3" suffix in SM15T27CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates automotive-grade packaging (tape-and-reel), and "M3" confirms halogen-free molding compound and matte tin-plated leads compliant with JESD201 class 2 whisker resistance. This distinguishes it from commercial-grade "E3" or non-automotive "M3" variants.
Is SM15T27CAHM3/H unidirectional or bidirectional?
SM15T27CAHM3/H is a bidirectional transient voltage suppressor, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping in both polarities - essential for protecting AC-coupled or floating signal lines such as RS-485, CAN, or sensor bridges where voltage transients may swing positive or negative relative to ground.
What is the maximum clamping voltage of SM15T27CAHM3/H at rated peak pulse current?
The maximum clamping voltage of SM15T27CAHM3/H is 37.5 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 40.0 A. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does SM15T27CAHM3/H require heatsinking in typical PCB layouts?
No, SM15T27CAHM3/H does not require external heatsinking in typical applications. Its thermal design assumes mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, providing sufficient conduction path for single-pulse transient dissipation. Continuous power dissipation is limited to 6.5 W at TA = 50 °C, but surge events are non-repetitive by definition.
How does SM15T27CAHM3/H differ from SM15T27A variants?
SM15T27CAHM3/H differs from unidirectional SM15T27A variants in three key ways: (1) bidirectional operation (CA suffix), (2) AEC-Q101 qualification (HM3 suffix), and (3) halogen-free construction. Unidirectional versions lack symmetrical clamping and automotive validation, making SM15T27CAHM3/H mandatory for automotive signal line protection per OEM requirements.
SM15T27CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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 (SMC)
SM15T27CAHM3/H FAQ
1.How can I place an order for SM15T27CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T27CAHM3/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 SM15T27CAHM3/H reliable?
The price and inventory of SM15T27CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T27CAHM3/H is usually 5 days.
3.What payment methods are accepted for SM15T27CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T27CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T27CAHM3/H?
SM15T27CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T27CAHM3/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 SM15T27CAHM3/H?
For technical support, including SM15T27CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T27CAHM3/H requirements.
6.How does Aetrix verify that SM15T27CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T27CAHM3/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 SM15T27CAHM3/H meets industry standards.
7.What is the process for return or replacement of SM15T27CAHM3/H?
All SM15T27CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T27CAHM3/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 SM15T27CAHM3/H part is unused and in its original packaging.
Return procedure for SM15T27CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T27CAHM3/H Tags
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