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Vishay General Semiconductor - Diodes Division SM6T27A-E3/5B
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- Part No.:
- SM6T27A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T27A-E3/5B.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,654
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Product details
Overview
SM6T27A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, featuring 27 V breakdown voltage (VBR = 25.7–28.4 V at 1.0 mA), 23.1 V stand-off voltage (VWM), 37.5 V clamping voltage (VC) at 16.0 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T27A-E3/5B datasheet, SM6T27A-E3/5B pinout, SM6T27A-E3/5B application, or SM6T27A-E3/5B equivalent, key selection criteria include unidirectional polarity, SMB package thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix), low clamping ratio (VC/VBR ≈ 1.35), and RoHS-compliant matte tin plating.
Technical Context
The SM6T27A-E3/5B uses a glass-passivated silicon junction to achieve fast response (<1 ns) to transient overvoltages and low dynamic impedance for effective clamping. Its unidirectional configuration provides forward conduction capability up to 100 A IFSM (10 ms half-sine), enabling robust surge handling on power rails.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads, it delivers stable performance across -65 °C to +150 °C junction temperature range and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The device exhibits 1.0 μA max reverse leakage at VWM, ensuring minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - defines precise voltage threshold where clamping initiates under controlled test conditions |
| VWM | 23.1 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 37.5 V at 16.0 A (10/1000 μs) - actual clamped voltage seen by protected IC during worst-case surge |
| PPPM | 600 W - peak transient energy absorption capacity without failure under standardized waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C ambient |
| IFSM | 100 A - non-repetitive forward surge current rating, supports protection of DC power inputs |
| TJ max | +150 °C - maximum allowable junction temperature, enabling use in under-hood automotive environments |
Pinout & Package
SMB (DO-214AA) surface-mount package with cathode band marking; dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VIN exceeds VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane to complete clamping path |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables reliable suppression of high-energy transients common in automotive load-dump and inductive switch-off events |
| Low clamping voltage (37.5 V @ 16 A) | Keeps downstream 24 V-rated components like microcontrollers and CAN transceivers within safe operating limits |
| Glass passivated junction | Ensures long-term reliability and stable VBR over temperature and lifetime, critical for industrial deployments |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking, reducing manufacturing cost and process complexity |
| RoHS-compliant, halogen-free option available | Meets global environmental compliance requirements including EU RoHS Directive 2011/65/EU and JEDEC J-STD-20 |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor signal line and chassis ground. Use Value: Clamps transients to ≤37.5 V within nanoseconds, preventing damage to 3.3 V or 5 V ADC front-ends while maintaining signal integrity. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from relay coil flyback spikes. IC Role / Device Role / Timing Role: Standoff voltage (23.1 V) matches nominal 24 V rail; clamps surges before they reach optocoupler input stages. Use Value: Withstands 100 A surge (IFSM), ensuring immunity to repeated switching events without degradation. |
| Telecom Power Supply Protection | Consumer Appliance Motor Control |
Use Scenario: Safeguarding DC-DC converter inputs in base station power supplies subjected to lightning-induced surges on -48 V distribution buses. IC Role / Device Role / Timing Role: Primary transient suppressor on input rail, coordinated with upstream MOVs and downstream ceramic capacitors. Use Value: 600 W rating and 100 °C/W RθJA support sustained operation in enclosed telecom cabinets up to +70 °C ambient. |
Use Scenario: Protecting gate drivers and MCU pins in washing machine motor inverters from commutation spikes generated by BLDC motors. IC Role / Device Role / Timing Role: Mounted directly at motor driver IC supply pins to minimize inductance in clamping path. Use Value: Low-inductance SMB package and fast response reduce overshoot, preserving gate oxide integrity of 600 V MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W), higher VC (38.9 V @ 10.3 A), same SMB package | Less margin for high-energy automotive transients; suitable for lower-cost consumer-grade designs | Select SMAJ24A only if system-level testing confirms 400 W suffices and clamping voltage tolerance allows ≥38.9 V |
| SMCJ24A | Higher PPPM (1500 W), larger SMC (DO-214AB) package, VC = 38.9 V @ 38.9 A | Requires PCB layout change; better for severe industrial surge environments (IEC 61000-4-5 Level 4) | Choose SMCJ24A when surge threat level exceeds ISO 7637-2 Pulse 5a or when >600 W margin is required |
Compared with SMAJ24A and SMCJ24A, the SM6T27A-E3/5B delivers optimal balance of 600 W surge capacity, SMB footprint compatibility, and 23.1 V standoff-making it ideal for space-constrained 24 V systems requiring AEC-Q101 readiness without board redesign.
Availability
SM6T27A-E3/5B is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T27A-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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM6T Series was developed specifically for surface-mount transient suppression in harsh environments-including under-hood automotive, factory automation, and outdoor telecom-where consistent clamping performance and AEC-Q101 readiness are mandatory.
FAQ
What is the polarity configuration of SM6T27A-E3/5B?
The SM6T27A-E3/5B is a unidirectional transient voltage suppressor. Its cathode is marked by a band on the SMB package body, and it conducts surge current only when the anode is more negative than the cathode-making it suitable for DC rail protection where polarity is fixed, such as 24 V supply lines in automotive ECUs. This differs from bidirectional variants (e.g., SM6T27CA) used on AC or differential signal lines.
Does SM6T27A-E3/5B meet AEC-Q101 qualification?
The SM6T27A-E3/5B itself is RoHS-compliant commercial-grade; however, Vishay offers AEC-Q101 qualified versions under ordering codes SM6T27AHE3_X (e.g., SM6T27AHE3_B) with "HE3" suffix. These share identical electrical specs and SMB packaging but undergo additional stress testing per AEC-Q101. For automotive production, specify the HE3 variant-not SM6T27A-E3/5B-to ensure qualification compliance.
What is the maximum clamping voltage of SM6T27A-E3/5B under standard test conditions?
The SM6T27A-E3/5B has a maximum clamping voltage (VC) of 37.5 V when subjected to a 10/1000 μs waveform at 16.0 A peak pulse current (IPPM). This value is measured per Fig. 1 and Fig. 3 of Vishay document 88385 and reflects the actual voltage imposed on protected circuitry during worst-case transient events-critical for verifying compatibility with 3.3 V, 5 V, or 24 V system components.
Can SM6T27A-E3/5B be used in bidirectional signal protection?
No-SM6T27A-E3/5B is strictly unidirectional and unsuitable for bidirectional signal lines such as RS-485, CAN, or USB data pairs. For those applications, Vishay specifies bidirectional equivalents using the "CA" suffix (e.g., SM6T27CA), which exhibit symmetric clamping in both directions. Using SM6T27A-E3/5B on AC-coupled or differential signals risks forward conduction and potential latch-up or damage.
What is the thermal resistance and how does it affect SM6T27A-E3/5B derating?
The SM6T27A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. This means each watt of dissipated power raises the junction temperature by 100 °C above ambient. Derating curves in Fig. 2 of document 88385 show that at 75 °C ambient, its peak pulse power must be reduced to ~420 W to maintain TJ ≤ 150 °C-directly impacting surge survivability in high-temperature enclosures.
SM6T27A-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:
- 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):
- 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)
SM6T27A-E3/5B FAQ
1.How can I place an order for SM6T27A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T27A-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 SM6T27A-E3/5B reliable?
The price and inventory of SM6T27A-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 SM6T27A-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T27A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T27A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T27A-E3/5B?
SM6T27A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T27A-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 SM6T27A-E3/5B?
For technical support, including SM6T27A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T27A-E3/5B requirements.
6.How does Aetrix verify that SM6T27A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T27A-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 SM6T27A-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T27A-E3/5B?
All SM6T27A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T27A-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 SM6T27A-E3/5B part is unused and in its original packaging.
Return procedure for SM6T27A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T27A-E3/5B Tags
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