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Vishay General Semiconductor - Diodes Division SM6T27CA-E3/5B
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- Part No.:
- SM6T27CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T27CA-E3/5B.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
SM6T27CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 27 V breakdown voltage (VBR = 25.7–28.4 V at IT = 1.0 mA), and 37.5 V maximum clamping voltage (VC) at IPPM. It protects signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T27CA-E3/5B datasheet, SM6T27CA-E3/5B pinout, SM6T27CA-E3/5B application, or SM6T27CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3/HM3 variants), low clamping ratio (VC/VBR ≈ 1.39), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SM6T27CA-E3/5B operates as a symmetric, bidirectional avalanche diode with no polarity marking-its terminals are functionally interchangeable. It delivers precise voltage clamping across both polarities using a glass-passivated silicon junction, enabling robust protection of differential or AC-coupled signal paths without external biasing.
Its thermal design relies on low RθJA = 100 °C/W (typ.) when mounted on 5.0 mm × 5.0 mm copper pads, supporting sustained 5.0 W power dissipation at TA = 50 °C. The device meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at IT = 1.0 mA - defines reliable conduction onset under transient stress |
| VWM | 23.1 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 37.5 V at 16.0 A (10/1000 μs) - limits protected circuit voltage during worst-case surge |
| PPPM | 600 W - peak transient energy absorption capacity per single event |
| IFSM | Not applicable - bidirectional device has no forward surge rating |
| TJ range | −65 °C to +150 °C - supports operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm body length and 2.20 mm height |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical junction; connects to either side of protected line |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical junction; electrically identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity constraints |
| 600 W peak pulse power | Handles high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive ECUs |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream ICs like CAN transceivers or ADC front-ends |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak without baking |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1.0 μA at VWM) over temperature and lifetime |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting wheel speed sensor outputs exposed to load-dump and inductive kickback in chassis modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential signal pair (e.g., VR sensor output) to clamp ±30 V transients. Use Value: Prevents latch-up or damage to analog front-end amplifiers while maintaining signal integrity below 23.1 V DC operating range. | Use Scenario: Safeguarding RS-485 transceiver bus lines (A/B) in factory automation PLCs subject to EFT and surge events. IC Role / Device Role / Timing Role: Symmetric clamping device installed between A and B lines and ground to suppress common-mode surges. Use Value: Limits bus voltage excursions to ≤37.5 V during 1 kV/500 A surge, preserving transceiver compliance with TIA-485-A. |
| Consumer Audio Line Input | Telecom DSL Line Card |
Use Scenario: Shielding analog audio inputs (e.g., AUX, microphone) in smart speakers from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS bridging input line to ground, activated only during >25.7 V transients. Use Value: Maintains <1.0 μA leakage at 23.1 V nominal, avoiding DC offset or noise injection into low-level audio paths. | Use Scenario: Transient suppression on ADSL/VDSL line interface transformers in residential gateways. IC Role / Device Role / Timing Role: Primary protection device across secondary winding to absorb lightning-induced surges up to 600 W. Use Value: Withstands repeated 10/1000 μs surges without degradation, meeting ITU-T K.20/21 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA | 400 W PPPM, VBR = 31.1–34.4 V, VC = 45.4 V @ 8.8 A - lower power, higher clamping | Less suitable for ISO 7637-2 Pulse 5a (high-current); better for space-constrained layouts (SMA vs SMB) | Select SMAJ28CA only if board area is critical and peak surge current remains ≤8.8 A |
| 1.5KE27CA | 1500 W PPPM, DO-201 package - higher power but through-hole mounting, larger footprint | Requires manual or wave soldering; unsuitable for fully SMT production or high-density boards | Choose 1.5KE27CA only for legacy through-hole designs or where >600 W surge margin is mandatory |
Compared with SMAJ28CA and 1.5KE27CA, the SM6T27CA-E3/5B offers optimal balance of 600 W surge handling, SMB footprint compatibility, and AEC-Q101-ready variants-making it preferred for new automotive and industrial SMT designs requiring validated reliability and automated assembly.
Availability
SM6T27CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 interfaces, and consumer audio line inputs requiring stable component supply, RoHS-compliant packaging, and consistent SMB (DO-214AA) form factor.
Supply support for SM6T27CA-E3/5B 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SM6T Series is designed specifically for robust transient voltage suppression in harsh environments-targeting automotive, industrial, and telecom applications where bidirectional clamping, high surge tolerance, and AEC-Q101 readiness are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T27CA-E3/5B?
The "CA" suffix denotes a bidirectional configuration: the SM6T27CA-E3/5B functions identically for positive and negative transients, with no cathode band marking and symmetric VBR and VC characteristics in both directions. This differs from unidirectional variants (e.g., SM6T27A) that require correct polarity orientation. The CA version is essential for protecting AC-coupled or floating signal paths where voltage polarity is undefined.
Is SM6T27CA-E3/5B qualified to AEC-Q101?
The base SM6T27CA-E3/5B is RoHS-compliant commercial-grade; AEC-Q101 qualification is available under automotive ordering codes SM6T27CAHE3_B or SM6T27CAHM3_B (with "HE3" or "HM3" suffix). These variants undergo additional stress testing per AEC-Q101 Rev D and are marked with revision codes (e.g., "_B"). For automotive production, specify the HE3/HM3 variant-not the E3/5B alone-to ensure qualification compliance.
What is the maximum clamping voltage of SM6T27CA-E3/5B under a 10/1000 μs surge?
The SM6T27CA-E3/5B has a maximum clamping voltage VC of 37.5 V when subjected to its rated peak pulse current IPPM = 16.0 A under a 10/1000 μs waveform. This value is guaranteed per the Vishay datasheet (Doc. #88385, Rev. 09-Jan-2024) and measured with the device mounted on 5.0 mm × 5.0 mm copper pads. Clamping voltage increases slightly at higher ambient temperatures due to thermal derating.
Can SM6T27CA-E3/5B replace SM6T27A in an existing design?
No-SM6T27CA-E3/5B is bidirectional while SM6T27A is unidirectional; they are not functionally interchangeable. Replacing SM6T27A with SM6T27CA-E3/5B removes polarity dependence but alters circuit behavior: the CA version conducts during both polarities, potentially increasing leakage in DC-biased circuits and changing failure modes. Layout changes may be needed to verify grounding and avoid unintended conduction paths.
What is the thermal resistance junction-to-ambient for SM6T27CA-E3/5B?
The typical thermal resistance junction-to-ambient (RθJA) for SM6T27CA-E3/5B is 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay Doc. #88385. This value assumes still air conditions and defines the temperature rise above ambient per watt of steady-state power dissipation. For pulsed operation, transient thermal impedance must be used instead of RθJA.
SM6T27CA-E3/5B 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-E3/5B FAQ
1.How can I place an order for SM6T27CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T27CA-E3/5B 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-E3/5B reliable?
The price and inventory of SM6T27CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T27CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T27CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T27CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T27CA-E3/5B?
SM6T27CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T27CA-E3/5B 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-E3/5B?
For technical support, including SM6T27CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T27CA-E3/5B requirements.
6.How does Aetrix verify that SM6T27CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T27CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T27CA-E3/5B?
All SM6T27CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T27CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SM6T27CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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