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Vishay General Semiconductor - Diodes Division SM6T27CA-M3/5B
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- Part No.:
- SM6T27CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T27CA-M3/5B.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,007
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Product details
Overview
SM6T27CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount TRANSZORB® transient voltage suppressor (TVS) in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 23.1 V stand-off voltage (VWM), 25.7–28.4 V breakdown voltage (VBR), and 37.5 V maximum clamping voltage (VC) at 16.0 A IPPM. It protects signal lines and power rails in automotive sensor units and industrial control interfaces.
For engineers reviewing the SM6T27CA-M3/5B datasheet, SM6T27CA-M3/5B pinout, SM6T27CA-M3/5B application, or SM6T27CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HM3 suffix), halogen-free RoHS compliance, low-inductance SMB footprint, and verified 150 °C junction temperature rating.
Technical Context
The SM6T27CA-M3/5B operates as a bidirectional avalanche diode, providing symmetrical clamping in both polarities without polarity marking. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM), while the SMB package delivers low thermal resistance (RθJL = 20 °C/W) and meets J-STD-020 MSL Level 1.
Designed for transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT), it sustains non-repetitive 10/1000 μs pulses up to 600 W with derating above 25 °C ambient, and supports surge currents up to 16.0 A (IPPM) at clamping voltage ≤37.5 V - critical for protecting 24 V automotive CAN and LIN bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 23.1 V - maximum continuous reverse voltage before significant leakage; sets operating margin for 24 V systems. |
| VBR min/max | 25.7 V / 28.4 V at 1.0 mA IT - defines reliable avalanche onset window for predictable clamping threshold. |
| VC @ IPPM | 37.5 V at 16.0 A (10/1000 μs) - limits protected circuit voltage during transients, enabling safe operation of 30 V-rated ICs. |
| PPPM | 600 W - peak transient energy absorption capacity under standardized 10/1000 μs waveform. |
| TJ max | +150 °C - enables deployment in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMB (DO-214AA) - 0.220" × 0.130" footprint with matte tin leads; compatible with automated SMT placement and reflow (260 °C peak). |
Pinout & Package
SM6T27CA-M3/5B uses an SMB (DO-214AA) surface-mount package with two terminals and no polarity marking (bidirectional configuration). The case conforms to UL 94 V-0 flammability rating and features glass-passivated die bonded to copper leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional current path | No functional distinction between terminals; either terminal serves as anode or cathode depending on transient polarity. |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary heat conduction path to PCB copper pads; no electrical connection. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against load-dump and inductive switching transients in 24 V vehicle subsystems. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance mandates without compromising thermal or electrical performance. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
| MSL Level 1, 260 °C reflow compatible | Eliminates moisture sensitivity concerns and supports standard lead-free assembly processes without baking. |
| AEC-Q101 qualification path (HM3 variant) | Provides documented reliability evidence for automotive safety-critical sensor and ECU protection applications. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog and digital signal lines (e.g., temperature, pressure, position sensors) in engine control modules and ADAS ECUs from ISO 7637-2 load dump and coupled transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 24 V rail-connected microcontrollers and signal conditioners during vehicle cranking or alternator regulation faults. |
Use Scenario: Safeguarding 24 V DC input/output channels of programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on DIN-rail mounted I/O modules, positioned before optocouplers and level-shifting circuitry. Use Value: Maintains system uptime by absorbing >600 W pulses without degradation, reducing field failure rates in factory automation environments. |
| Telecom Power Interface | Consumer Appliance Motor Control |
Use Scenario: Clamping induced transients on 24–48 V DC power inputs of remote radio units and base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after bulk MOVs to handle fast-rising, medium-energy transients that bypass upstream protection. Use Value: Provides precise 37.5 V clamping to protect PoE-like DC-DC converters and Ethernet PHYs without overdesigning upstream stages. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., washing machine drum drives, HVAC blowers). IC Role / Device Role / Timing Role: Low-inductance bidirectional clamp across motor terminals to contain flyback energy before it couples into MCU supply rails. Use Value: Eliminates need for snubber RC networks, reducing BOM count and PCB area while meeting CISPR 14-1 EMC immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | Lower PPPM (400 W), higher VWM (24.0 V), same SMB package and bidirectional function. | Less robust for high-energy load-dump events; suitable only where peak transients remain <400 W. | Select SMAJ24CA only when system-level testing confirms 400 W clamping margin is sufficient and cost optimization is prioritized. |
| SMCJ24CA | Higher PPPM (1500 W), larger SMC (DO-214AB) package, identical VWM/VBR range and bidirectional operation. | Requires PCB layout change due to 2.5× larger footprint; suited for higher-power industrial motor drives. | Choose SMCJ24CA when 600 W is insufficient and board space allows SMC package; not drop-in compatible with SM6T27CA-M3/5B layout. |
Compared with SMAJ24CA and SMCJ24CA, the SM6T27CA-M3/5B delivers optimal balance of 600 W surge handling, SMB footprint compatibility, and halogen-free compliance - making it the preferred choice for space-constrained 24 V automotive and industrial designs requiring validated AEC-Q101 readiness via HM3 variants.
Availability
SM6T27CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom DC power interface applications requiring stable component supply, halogen-free compliance, and MSL Level 1 assembly support.
Supply support for SM6T27CA-M3/5B 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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM6T Series was engineered specifically for surface-mount transient suppression in space-constrained, high-reliability 12–220 V systems - emphasizing low clamping voltage, repeatable avalanche behavior, and automotive-grade process controls.
FAQ
What does the "CA" suffix indicate in SM6T27CA-M3/5B?
The "CA" suffix in SM6T27CA-M3/5B explicitly denotes a bidirectional configuration, meaning the device clamps transient voltages symmetrically in both polarities. Unlike unidirectional variants (e.g., SM6T27A), SM6T27CA-M3/5B has no cathode band marking and functions identically regardless of terminal orientation - essential for AC-coupled or floating signal line protection where polarity is undefined.
Is SM6T27CA-M3/5B qualified to AEC-Q101?
The SM6T27CA-M3/5B itself is the commercial-grade halogen-free variant; AEC-Q101 qualification applies to the HM3-suffixed version (e.g., SM6T27CAHM3_B/I). While SM6T27CA-M3/5B shares identical die, construction, and electrical specs, formal AEC-Q101 test reports and part numbering require the HM3 suffix and associated revision code - confirmed in Vishay's ordering information table and qualification documentation.
What is the maximum clamping voltage of SM6T27CA-M3/5B under standard test conditions?
The maximum clamping voltage (VC) of SM6T27CA-M3/5B is 37.5 V, measured at 16.0 A peak pulse current (IPPM) using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and forms the basis for determining safe voltage margins for downstream ICs such as CAN transceivers and microcontroller I/O pins.
How does the SMB package of SM6T27CA-M3/5B compare to SMA or SMC in terms of thermal performance?
The SMB (DO-214AA) package of SM6T27CA-M3/5B offers a thermal resistance of RθJL = 20 °C/W (junction-to-lead) and RθJA = 100 °C/W (junction-to-ambient on 0.2" × 0.2" copper pads), striking a balance between compact size and thermal capability. It delivers lower RθJA than SMA but higher than SMC - making SM6T27CA-M3/5B ideal for moderate-power 24 V applications where board space is constrained but 600 W pulse handling is required.
Can SM6T27CA-M3/5B be used in place of SM6T27A in an existing design?
SM6T27CA-M3/5B is not a direct replacement for SM6T27A because it is bidirectional whereas SM6T27A is unidirectional with a defined cathode band. Substituting them requires verifying circuit topology: SM6T27CA-M3/5B may be used only where polarity independence is acceptable (e.g., differential signal lines), but never where forward conduction or DC biasing depends on unidirectional behavior - doing so risks improper clamping or leakage path formation.
SM6T27CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 16A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SM6T27CA-M3/5B FAQ
1.How can I place an order for SM6T27CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T27CA-M3/5B 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 SM6T27CA-M3/5B reliable?
The price and inventory of SM6T27CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T27CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T27CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T27CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T27CA-M3/5B?
SM6T27CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T27CA-M3/5B 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 SM6T27CA-M3/5B?
For technical support, including SM6T27CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T27CA-M3/5B requirements.
6.How does Aetrix verify that SM6T27CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T27CA-M3/5B 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 SM6T27CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T27CA-M3/5B?
All SM6T27CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T27CA-M3/5B, 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 SM6T27CA-M3/5B part is unused and in its original packaging.
Return procedure for SM6T27CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T27CA-M3/5B Tags
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