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Vishay General Semiconductor - Diodes Division SM5A27HM3/I
- Part No.:
- SM5A27HM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5A27HM3/I.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,307
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Product details
Overview
SM5A27HM3/I 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), 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 SM5A27HM3/I datasheet, SM5A27HM3/I pinout, SM5A27HM3/I application, or SM5A27HM3/I equivalent, key selection criteria include its DO-218AC package thermal performance (RθJM = 0.45 °C/W), TJ = 175 °C operation, ISO 7637-2 compliance, low leakage (<0.2 μA at 25 °C), and unidirectional clamping behavior in high-reliability 12 V/24 V automotive systems.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge stress. Its junction passivation enables reliable operation up to TJ = 175 °C and meets MSL Level 1 (245 °C peak reflow), supporting automated SMT assembly in automotive ECUs.
The device exhibits a clamping voltage of ≤40.0 V at 55 A (10/10 ms waveform) and forward voltage ≤1.0 V at 6.0 A, enabling low-loss transient suppression in power rail protection circuits. Polarity is fixed: heatsink is anode, cathode is lead 1 - critical for correct PCB layout orientation in load-dump paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 24–30 V at 10 mA - ensures precise breakdown initiation above 22 V system nominal, avoiding false triggering during transients. |
| VWM | 22 V - maximum continuous reverse voltage before conduction; sets safe operating margin below 24 V automotive battery peaks. |
| PPPM (10/1000 μs) | 3600 W - sustains high-energy load dump surges without failure, per ISO 7637-2 Pulse 5a requirements. |
| IPPM | 70 A - peak surge current handling capability directly supports clamp performance at defined VC ≤40.0 V. |
| TJ max. | 175 °C - enables placement near hot components (e.g., power MOSFETs, DC/DC converters) in engine control modules. |
| RθJM | 0.45 °C/W - low junction-to-mount thermal resistance allows efficient heat transfer to PCB copper pour or metal heatsink. |
| Leakage (TJ = 175 °C) | ≤10.0 μA - minimal standby power loss and signal integrity impact in always-on vehicle networks. |
Pinout & Package
Package: DO-218AC - surface-mount, anode-heatsink configuration with matte tin-plated leads, UL 94 V-0 molding compound, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (cathode) | Cathode terminal | Connected to protected circuit node; carries full surge current during clamping; must route away from sensitive analog traces. |
| Lead 2 / Metal heatsink (anode) | Anode terminal + thermal path | Electrically tied to system ground or low-impedance return; primary thermal interface to PCB copper pour or chassis. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability across temperature cycling, humidity, and mechanical shock per JEDEC standards. |
| ISO 7637-2 compliant | Withstands standardized load dump pulses (Pulse 5a) without degradation - essential for 12 V/24 V vehicle electrical systems. |
| DO-218AC package | Enables high-power dissipation in compact footprint (5.0 × 3.5 mm); optimized for thermal coupling to PCB copper area. |
| Low VF (≤1.0 V @ 6 A) | Minimizes forward conduction loss during bidirectional surge events, reducing self-heating during repeated clamping. |
| Junction passivation | Prevents parametric drift and leakage increase under high-temperature bias stress, ensuring long-term stability in engine bay environments. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects 12 V supply input of engine ECU against alternator load dump surges up to 40 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse-polarity transients while maintaining low leakage during normal operation. Use Value: Prevents damage to downstream DC/DC regulators and microcontrollers by limiting VC to ≤40.0 V at 55 A, with TJ derating support up to 175 °C. |
Use Scenario: Shields BCM power rail feeding isolated CAN transceivers from battery line transients. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed upstream of LDOs supplying CAN PHYs. Use Value: Ensures uninterrupted CAN communication during ignition cycling by suppressing sub-100 ns spikes with <0.2 μA leakage at 25 °C. |
| Start-Stop System Battery Interface | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Guards start-stop controller's main 12 V input against repeated cranking-induced voltage reversals and surges. IC Role / Device Role / Timing Role: Primary overvoltage protector on high-current battery feed, mounted directly to copper pour. Use Value: Delivers 3600 W pulse handling with RθJM = 0.45 °C/W, enabling thermal survival during frequent 10/1000 μs surges in urban driving cycles. |
Use Scenario: Protects H-bridge driver IC supply rails from inductive kickback generated by EPS motor commutation. IC Role / Device Role / Timing Role: High-surge-capable TVS placed at motor driver power entry point, anode grounded to chassis. Use Value: Clamps transients to ≤40.0 V within nanoseconds, preventing latch-up or gate oxide damage in 40 V-rated MOSFET drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ27A | Lower PPPM (400 W), SMA package (RθJA = 110 °C/W), no AEC-Q101 qualification | Not suitable for under-hood automotive use; limited to industrial or consumer board-level protection | Select only for cost-sensitive non-automotive designs where 3600 W surge rating and 175 °C operation are unnecessary. |
| TPSMD27 | Same DO-218AC package, but bidirectional (±27 V), higher VWM (22.5 V), lower IPPM (65 A) | Applicable where symmetrical surge protection (e.g., data lines) is required; not optimized for unidirectional load dump | Choose only if bidirectional clamping is mandated; otherwise SM5A27HM3/I provides superior unidirectional energy handling and thermal robustness. |
Compared with SMAJ27A and TPSMD27, the SM5A27HM3/I delivers 9× higher peak pulse power, certified automotive reliability, and superior thermal coupling - making it the preferred choice for mission-critical 12 V/24 V load dump protection where sustained surge energy and junction temperature stability are design priorities.
Availability
SM5A27HM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and electric power steering systems requiring stable component supply, AEC-Q101 compliance, and high-temperature surge resilience.
Supply support for SM5A27HM3/I 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 SM5A27HM3/I belongs to Vishay's PAR® (Protection Advanced Rectifier) TVS family, engineered specifically for high-energy automotive transients including ISO 7637-2 load dump, with emphasis on thermal robustness and AEC-Q101 validation.
FAQ
What is the polarity configuration of the SM5A27HM3/I?
The SM5A27HM3/I is a unidirectional TVS diode with fixed polarity: the metal heatsink (lead 2) is the anode, and lead 1 is the cathode. This configuration must be observed during PCB layout to ensure correct clamping direction - the anode connects to system ground or low-impedance return, and the cathode connects to the protected line. Reversing polarity prevents proper surge suppression and may cause device failure.
Does the SM5A27HM3/I meet automotive qualification standards?
Yes, the SM5A27HM3/I is AEC-Q101 qualified and rated for operation from –55 °C to +175 °C. It also meets ISO 7637-2 for load dump immunity and MSL Level 1 per J-STD-020 (245 °C peak reflow). These qualifications confirm its suitability for under-hood automotive applications such as engine control units and electric power steering systems where reliability under thermal and electrical stress is mandatory.
What is the clamping voltage of the SM5A27HM3/I at rated surge current?
The SM5A27HM3/I has a maximum clamping voltage (VC) of 40.0 V when subjected to a 55 A, 10/10 ms exponentially decaying surge current. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on the protected circuit during worst-case transient events - critical for ensuring downstream ICs (e.g., microcontrollers, CAN transceivers) remain within absolute maximum ratings.
How does the DO-218AC package of the SM5A27HM3/I improve thermal performance?
The DO-218AC package of the SM5A27HM3/I integrates a large metal heatsink as the anode terminal, achieving a typical junction-to-mount thermal resistance (RθJM) of 0.45 °C/W. This enables direct thermal conduction from the silicon die to PCB copper pours or chassis ground planes - significantly outperforming standard SMA or SMB packages - and supports sustained 5 W power dissipation with minimal temperature rise in high-density automotive layouts.
Can the SM5A27HM3/I replace older SMAJ-series TVS diodes in automotive designs?
No, the SM5A27HM3/I is not a drop-in replacement for SMAJ-series devices due to fundamental differences in package (DO-218AC vs. SMA), thermal performance (RθJM = 0.45 °C/W vs. RθJA ≈ 110 °C/W), and surge rating (3600 W vs. 400 W). While both suppress 27 V transients, the SM5A27HM3/I requires revised PCB layout for its anode-heatsink mounting and delivers order-of-magnitude higher energy handling - necessitating full revalidation in any legacy design migration.
SM5A27HM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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
- 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-218AC
SM5A27HM3/I FAQ
1.How can I place an order for SM5A27HM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5A27HM3/I 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 SM5A27HM3/I reliable?
The price and inventory of SM5A27HM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5A27HM3/I is usually 5 days.
3.What payment methods are accepted for SM5A27HM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5A27HM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5A27HM3/I?
SM5A27HM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5A27HM3/I 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 SM5A27HM3/I?
For technical support, including SM5A27HM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5A27HM3/I requirements.
6.How does Aetrix verify that SM5A27HM3/I is sourced from the original manufacturer or authorized distributors?
All SM5A27HM3/I 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 SM5A27HM3/I meets industry standards.
7.What is the process for return or replacement of SM5A27HM3/I?
All SM5A27HM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5A27HM3/I, 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 SM5A27HM3/I part is unused and in its original packaging.
Return procedure for SM5A27HM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5A27HM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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