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Vishay General Semiconductor - Diodes Division SM5A27HE3/2D
- Part No.:
- SM5A27HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5A27HE3/2D.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,824
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Product details
Overview
SM5A27HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection. It features a 27 V breakdown voltage (VBR = 24–30 V), 3600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for operation up to TJ = 175 °C in DO-218AB package.
For engineers reviewing the SM5A27HE3/2D datasheet, SM5A27HE3/2D pinout, SM5A27HE3/2D application, or SM5A27HE3/2D equivalent, key selection criteria include clamping voltage (VC ≤ 40.0 V at IPP = 55 A), low leakage (IR ≤ 0.2 µA at 22 V, 25 °C), and ISO7637-2 compliance for robust automotive transients.
Technical Context
The SM5A27HE3/2D employs passivated anisotropic rectifier technology with heatsink-as-anode polarity, enabling high surge capability (IPPM = 70 A) and thermal stability under repetitive load dump stress. Its junction passivation and MSL Level 1 rating support reflow compatibility at 245 °C peak.
Designed specifically for unidirectional DC line protection, it delivers low forward voltage (VF ≤ 1.0 V at 6.0 A) and tight VBR tolerance (±11%) across temperature, with αT ≤ 36 mV/°C ensuring predictable clamping behavior in high-temperature engine bay environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 24 V / 30 V - defines reliable turn-on threshold for transient suppression without false triggering at 22 V working voltage |
| PPPM (10/1000 µs) | 3600 W - supports high-energy load dump surges per ISO7637-2 without degradation |
| VC @ 55 A | ≤ 40.0 V - limits downstream IC voltage stress during worst-case transient events |
| IR @ VWM, 25 °C | ≤ 0.2 µA - minimizes standby power loss in always-on automotive modules |
| TJ max. | 175 °C - enables direct mounting on hot chassis or near power electronics without derating |
| RθJM | 0.45 °C/W - ensures efficient heat transfer to metal heatsink, critical for sustained 5 W dissipation |
| Polarity | Unidirectional, anode = heatsink - dictates PCB layout orientation and thermal interface design |
Pinout & Package
Package: DO-218AB - molded surface-mount case with matte tin-plated leads, UL 94 V-0 rated, JESD201 Class 2 whisker compliant, and optimized for high-reliability automotive assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry point during reverse transient clamp | Must be soldered to large copper area or metal chassis for thermal management and EMI control |
| Cathode | Current exit point during clamp; connected to protected line | Routing must minimize inductance to maintain fast response and low VC |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JEDEC standards |
| ISO7637-2 compliance | Guarantees survivability against standardized 12 V/24 V vehicle electrical system transients |
| MSL Level 1 (245 °C) | Enables single-pass lead-free reflow without popcorn or delamination risk |
| Junction passivation | Prevents moisture ingress and metallization corrosion in humid, under-hood conditions |
| Low VF (≤1.0 V @ 6 A) | Reduces conduction losses during fault current flow, limiting self-heating during extended surges |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) LIN Bus Line Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of engine control units against alternator load dump spikes up to 40 V. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping transient energy before it reaches MCU power regulators and CAN transceivers. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDOs and microcontrollers during cold-crank or battery-disconnect events. | Use Scenario: Shields LIN physical layer transceivers from coupled transients on shared vehicle harnesses. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed between LIN bus line and ground, referenced to module ground plane. Use Value: Maintains signal integrity and prevents false wake-up or communication timeout during ignition switching noise. |
| Automotive Lighting Driver Output Protection | Start-Stop System Battery Monitoring Circuit |
Use Scenario: Safeguards LED driver output stage from inductive kickback when driving high-current headlamp loads. IC Role / Device Role / Timing Role: High-surge-capable TVS mounted directly at driver output pins to absorb flyback energy. Use Value: Eliminates need for external snubbers while sustaining >70 A peak current without failure. | Use Scenario: Protects precision voltage dividers and ADC inputs monitoring 12 V battery health during aggressive start-stop cycles. IC Role / Device Role / Timing Role: Low-leakage TVS placed across sensing nodes to shunt overvoltage without biasing error. Use Value: Ensures <0.2 µA leakage at 22 V does not corrupt sub-mV-level battery voltage measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5A27HM3 | Same VBR, PPPM, and DO-218AB package; differs only in packaging (reel code HM3 vs HE3/2D) and marking | No functional difference; HM3 uses different tape/reel configuration (2D vs 3D) and may vary in reel quantity | Select HM3 if standard 3000-unit reels preferred; HE3/2D provides 750-unit reels for prototyping or low-volume builds |
| SMAJ27A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA), no AEC-Q101 qualification | Not suitable for under-hood automotive use; limited to interior or industrial applications with lower surge demands | Use only where ISO7637-2 compliance and 175 °C operation are not required |
Compared with SM5A27HM3 and SMAJ27A, the SM5A27HE3/2D uniquely combines AEC-Q101 qualification, 3600 W surge rating, and DO-218AB thermal performance-making it the only option validated for high-reliability engine compartment deployment with minimal PCB area and no derating.
Availability
SM5A27HE3/2D is available at Aetrix Electronics and suitable for automotive ECU protection, body control module hardening, and start-stop system voltage monitoring requiring stable component supply and long-term lifecycle assurance.
Supply support for SM5A27HE3/2D 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 optoelectronics for automotive, industrial, and computing markets.
The SM5A27HE3/2D belongs to Vishay's PAR® TVS family-engineered specifically for automotive-grade transient suppression with emphasis on thermal robustness, surge endurance, and AEC-Q101 compliance.
FAQ
What is the maximum clamping voltage of the SM5A27HE3/2D at its rated peak pulse current?
The SM5A27HE3/2D has a maximum clamping voltage (VC) of 40.0 V when subjected to a 10 µs/10 ms exponentially decaying waveform at IPP = 55 A. This value is measured per standard test conditions and ensures downstream components remain within safe operating voltage limits during ISO7637-2 load dump events. The SM5A27HE3/2D maintains this clamping performance across its full operating temperature range up to 175 °C.
Is the SM5A27HE3/2D suitable for new automotive designs despite the "Not For New Designs" note?
The "Not For New Designs" note applies only to legacy variants-not the SM5A27HE3/2D itself. This part remains actively manufactured, AEC-Q101 qualified, and supported by Vishay with documented 2026 revision date and full compliance to ISO7637-2 and MSL Level 1. Engineers may confidently specify the SM5A27HE3/2D for new automotive programs requiring high-surge, high-temperature TVS protection.
How does the DO-218AB package of the SM5A27HE3/2D improve thermal performance over SMA or SMB packages?
The DO-218AB package of the SM5A27HE3/2D provides a dedicated metal heatsink terminal (anode) with RθJM = 0.45 °C/W-over 10× better than typical SMA packages. This allows direct thermal coupling to chassis or copper planes, enabling full 3600 W surge handling without silicon overheating. Unlike SMA/SMB, DO-218AB supports continuous 5 W dissipation on infinite heatsink, making it essential for sustained load dump immunity in modern 12 V/48 V hybrid systems.
Does the SM5A27HE3/2D meet RoHS and halogen-free requirements?
Yes, the SM5A27HE3/2D carries the E3 suffix, confirming it is RoHS-compliant, halogen-free, and Pb-free per JEDEC standards. Its molding compound meets UL 94 V-0 flammability rating, and its matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability requirements. The E3 designation also verifies compliance with Vishay's material categorization standard (doc# 99912).
What is the reverse leakage current specification for the SM5A27HE3/2D at elevated temperature?
At rated working voltage (VWM = 22 V), the SM5A27HE3/2D exhibits reverse leakage current (IR) ≤ 0.2 µA at 25 °C and ≤ 10.0 µA at TJ = 175 °C. This low, well-characterized leakage ensures minimal impact on precision sensing circuits-even in high-temperature engine bay environments-while maintaining robust transient suppression capability across the full automotive temperature range.
SM5A27HE3/2D 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
SM5A27HE3/2D FAQ
1.How can I place an order for SM5A27HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5A27HE3/2D 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 SM5A27HE3/2D reliable?
The price and inventory of SM5A27HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5A27HE3/2D is usually 5 days.
3.What payment methods are accepted for SM5A27HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5A27HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5A27HE3/2D?
SM5A27HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5A27HE3/2D 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 SM5A27HE3/2D?
For technical support, including SM5A27HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5A27HE3/2D requirements.
6.How does Aetrix verify that SM5A27HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5A27HE3/2D 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 SM5A27HE3/2D meets industry standards.
7.What is the process for return or replacement of SM5A27HE3/2D?
All SM5A27HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5A27HE3/2D, 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 SM5A27HE3/2D part is unused and in its original packaging.
Return procedure for SM5A27HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5A27HE3/2D Tags
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