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Vishay General Semiconductor - Diodes Division SM5A27HE3/2E
- Part No.:
- SM5A27HE3/2E
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5A27HE3/2E.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,445
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Product details
Overview
SM5A27HE3/2E from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor designed for automotive load dump protection. It features a 27 V breakdown voltage (VBR = 24–30 V at 10 mA), 3600 W peak pulse power (10/1000 μs), 22 V working stand-off voltage (VWM), 70 A peak pulse current (IPPM), and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SM5A27HE3/2E datasheet, SM5A27HE3/2E pinout, SM5A27HE3/2E application, or SM5A27HE3/2E equivalent, key selection criteria include its DO-218AB package thermal performance (RθJM = 0.45 °C/W), 175 °C junction rating, low 0.2 μA leakage at 25 °C, and ISO7637-2 compliance for automotive transients.
Technical Context
The SM5A27HE3/2E employs passivated anisotropic rectifier technology with heatsink-as-anode polarity, enabling high-reliability clamping in high-temperature environments. Its unidirectional architecture delivers 40.0 V clamping voltage at 55 A (10/10 ms waveform) and maintains stable VBR with a temperature coefficient of ≤36 mV/°C.
Designed for transient suppression in 12 V automotive systems, it supports load dump events per ISO7637-2 and handles 500 A non-repetitive forward surge (IFSM). The DO-218AB package provides MSL Level 1 moisture sensitivity and 245 °C lead-free solder compatibility per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 24–30 V at 10 mA - ensures precise breakdown threshold for 22 V nominal system protection |
| VWM | 22 V - maximum continuous reverse voltage before conduction begins |
| PPPM (10/1000 μs) | 3600 W - sustains high-energy transients without failure in automotive load dump scenarios |
| IPPM | 70 A - peak clamping current capability at defined waveform conditions |
| TJ max | 175 °C - enables operation in under-hood environments without derating |
| RθJM | 0.45 °C/W - low junction-to-mount thermal resistance for efficient heat transfer to heatsink |
| IR @ 25 °C | ≤0.2 μA - minimal leakage preserves system standby power integrity |
Pinout & Package
Package: DO-218AB - molded surface-mount case with matte tin-plated leads, UL 94 V-0 rated compound, and heatsink-integrated anode terminal. Meets JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive clamping node / thermal path | Electrically active anode terminal integrated into metal heatsink for simultaneous conduction and thermal dissipation |
| Cathode | Transient return path | Standard cathode connection for unidirectional clamping; mounted on PCB pad opposite heatsink |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including engine control, body modules, and ADAS sensors |
| ISO7637-2 compliance | Guaranteed performance against standardized automotive load dump and switching transients |
| 175 °C junction rating | Enables direct placement near heat sources (e.g., power converters) without external thermal management |
| Low VF (0.95 V @ 100 A) | Minimizes forward conduction loss during high-current surge events, reducing localized heating |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 245 °C peak without preconditioning |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses 12 V battery line transients caused by alternator load dump events in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across power input to clamp surges above 27 V. Use Value: Limits clamping voltage to ≤40.0 V at 55 A, preventing damage to downstream DC/DC converters and microcontrollers. |
Use Scenario: Protects 5 V or 3.3 V regulator inputs in engine control units exposed to ignition noise and relay switching spikes. IC Role / Device Role / Timing Role: Secondary-level transient suppressor downstream of main fuse and primary TVS. Use Value: Leverages low 0.2 μA leakage at 25 °C to avoid loading sensitive reference circuits during idle operation. |
| Body Control Module (BCM) Power Rail | ADAS Camera Power Input |
Use Scenario: Secures 12 V supply rails in door modules, lighting controllers, and seat control units. IC Role / Device Role / Timing Role: Primary overvoltage protector on fused battery feed before local regulators. Use Value: Delivers 3600 W peak pulse power handling while maintaining RθJM = 0.45 °C/W for stable thermal response during repeated surges. |
Use Scenario: Shields image sensor and serializer ICs in rear-view or surround-view cameras from cable-induced transients. IC Role / Device Role / Timing Role: Fast-response clamping device on camera module's 12 V input connector. Use Value: Achieves <10 ns response time (inherent to silicon avalanche structure) to prevent pixel corruption or reset events during ESD-like surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5A27HM3 | Same electrical specs and DO-218AB package; HM3 suffix indicates halogen-free, RoHS-compliant termination with identical AEC-Q101 qualification | No functional difference; intended as direct replacement for new designs where HE3 is marked "Not For New Designs" | Select SM5A27HM3 for new automotive designs requiring updated material compliance and long-term availability |
| SMAJ27A | Lower PPPM (400 W vs. 3600 W), SMA package (RθJA ≈ 55 °C/W), no AEC-Q101 qualification | Suitable only for non-automotive, low-energy industrial I/O protection; cannot replace SM5A27HE3/2E in load dump applications | Use SMAJ27A only in cost-sensitive consumer or industrial applications with sub-100 W surge requirements |
Compared with SM5A27HE3/2E, SM5A27HM3 offers identical protection performance with updated environmental compliance, while SMAJ27A provides basic clamping at one-ninth the pulse power and lacks automotive qualification-making it unsuitable for under-hood deployment.
Availability
SM5A27HE3/2E is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) input hardening, and body control module (BCM) power rail stabilization requiring stable component supply and long-term lifecycle support.
Supply support for SM5A27HE3/2E 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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM5A27HE3/2E belongs to Vishay's PAR® (Planar Avalanche Rectifier) TVS family, engineered specifically for high-energy automotive transients including ISO7637-2 load dump, with emphasis on thermal robustness and AEC-Q101 compliance.
FAQ
What does the "HE3/2E" suffix mean in SM5A27HE3/2E?
The "HE3" suffix denotes RoHS-compliant, AEC-Q101 qualified construction with matte tin plating and JESD 201 Class 2 whisker resistance; "2E" specifies packaging in 13″ plastic tape and reel with anode orientation toward sprocket holes. This exact configuration ensures traceable, automotive-grade sourcing for the SM5A27HE3/2E.
Is SM5A27HE3/2E suitable for 24 V commercial vehicle systems?
No - the SM5A27HE3/2E is rated for 22 V working voltage and 27 V breakdown, optimized for 12 V automotive systems. For 24 V applications, Vishay recommends higher-voltage variants such as SM5A33HE3/2E (VWM = 28.2 V, VBR = 31.4–34.6 V); using SM5A27HE3/2E in 24 V systems risks premature conduction and thermal overstress.
Does SM5A27HE3/2E require a heatsink to achieve its 3600 W rating?
Yes - the 3600 W PPPM rating assumes mounting on an infinite heatsink per JEDEC 51-14 (RθJM = 0.45 °C/W). Without a heatsink, the device relies on PCB copper area and ambient convection, limiting practical pulse power to ≤500 W. The SM5A27HE3/2E's metal heatsink terminal must be soldered to a thermally robust pad for full specification compliance.
How does SM5A27HE3/2E differ from standard SMAJ series TVS diodes?
The SM5A27HE3/2E uses Vishay's PAR® planar avalanche process for tighter VBR tolerance (24–30 V), higher surge capability (3600 W vs. 400 W), and AEC-Q101 qualification - unlike SMAJ27A, which is industrial-grade with wider VBR (28.9–31.9 V) and no automotive certification. These distinctions make SM5A27HE3/2E appropriate for safety-critical automotive use cases.
What is the meaning of "Not For New Designs" noted in the SM5A27HE3/2E datasheet?
"Not For New Designs" indicates Vishay has designated SM5A27HE3/2E as legacy status; new projects should use the functionally identical SM5A27HM3, which features updated halogen-free materials and extended manufacturing support. SM5A27HE3/2E remains available for existing production but is not recommended for design-in after Q2 2026 per Vishay's revision notice.
SM5A27HE3/2E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 55A (8/20µs)
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5A27HE3/2E FAQ
1.How can I place an order for SM5A27HE3/2E through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5A27HE3/2E 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 SM5A27HE3/2E reliable?
The price and inventory of SM5A27HE3/2E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5A27HE3/2E is usually 5 days.
3.What payment methods are accepted for SM5A27HE3/2E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5A27HE3/2E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5A27HE3/2E?
SM5A27HE3/2E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5A27HE3/2E 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 SM5A27HE3/2E?
For technical support, including SM5A27HE3/2E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5A27HE3/2E requirements.
6.How does Aetrix verify that SM5A27HE3/2E is sourced from the original manufacturer or authorized distributors?
All SM5A27HE3/2E 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 SM5A27HE3/2E meets industry standards.
7.What is the process for return or replacement of SM5A27HE3/2E?
All SM5A27HE3/2E units undergo pre-shipment inspection (PSI). If there is an issue with SM5A27HE3/2E, 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 SM5A27HE3/2E part is unused and in its original packaging.
Return procedure for SM5A27HE3/2E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5A27HE3/2E Tags
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