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Vishay General Semiconductor - Diodes Division SM5A27/2D
- Part No.:
- SM5A27/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5A27/2D.pdf
- Description:
- TVS DIODE 22VWM 40VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,964
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Product details
Overview
SM5A27/2D 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), 3600 W peak pulse power (10 × 1000 μs), 22 V working voltage (VWM), 40 V clamping voltage at 55 A, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SM5A27/2D datasheet, SM5A27/2D pinout, SM5A27/2D application, or SM5A27/2D equivalent, key selection criteria include its DO-218AB package thermal resistance (RθJC = 1.0 °C/W), 175 °C junction rating, ISO7637-2 compliance, low leakage (<0.2 μA at 25 °C), and heatsink-anode polarity configuration.
Technical Context
The SM5A27/2D employs passivated anisotropic rectifier technology to achieve stable Zener clamping under high-temperature transients. Its unidirectional structure enables forward conduction during overvoltage events while maintaining low leakage in reverse stand-off mode up to 22 V.
Designed specifically for automotive load dump suppression, it withstands 10 ms exponential surges per ISO7637-2 with 3600 W peak power and delivers 40 V clamping at 55 A. The DO-218AB case provides direct metal heatsink mounting with anode-connected thermal path and MSL Level 1 reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR | 27 V nominal breakdown voltage - defines precise clamping initiation threshold for load dump events |
| PPPM (10 × 1000 μs) | 3600 W - enables robust suppression of high-energy transients without failure |
| VWM | 22 V maximum working voltage - ensures reliable blocking during normal 24 V system operation |
| VC @ IPP = 55 A | ≤40 V - limits downstream IC stress during surge conditions |
| TJ max. | 175 °C - supports placement near hot engine compartments with no derating loss |
| RθJC | 1.0 °C/W - allows efficient heat transfer to external heatsink via metal case |
| Polarity | Unidirectional, anode = heatsink - dictates PCB layout orientation and thermal interface design |
Pinout & Package
Package: DO-218AB - surface-mount, thermally enhanced case with integral metal heatsink tab; anode terminal connected directly to heatsink for low-impedance thermal and electrical path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | High-impedance input node for transient sensing; connects to protected line (e.g., battery rail) |
| Lead 2 / Metal Heatsink | Anode | Low-impedance return path and primary thermal interface; must be soldered to copper pour or heatsink |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| Meets ISO7637-2 | Guarantees performance against standardized 12 V/24 V vehicle load dump waveforms |
| MSL Level 1 (245 °C peak) | Enables single-pass lead-free reflow without popcorn or delamination risk |
| Junction temp. rating: −55 to +175 °C | Supports full automotive ambient range without derating or thermal shutdown |
| Low IR: ≤0.2 μA @ 25 °C | Minimizes standby power loss in always-on vehicle modules |
Applications
| Automotive Load Dump Protection | Industrial 24 V DC Power Rail Protection |
|---|---|
Use Scenario: Protecting ECUs, body control modules, and infotainment systems from alternator-induced load dump spikes in 24 V vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode acting as primary clamping element on main battery input rail. Use Value: Limits transient voltage to ≤40 V at 55 A, preventing damage to downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers and motor drives powered from industrial 24 V DC supplies subject to switching surges. IC Role / Device Role / Timing Role: Standoff protector placed upstream of DC/DC converters and I/O interfaces. Use Value: Absorbs 3600 W surges without degradation, maintaining system uptime in factory automation environments. |
| Truck & Bus Electrical Systems | Off-Highway Equipment Power Inputs |
Use Scenario: Securing telematics gateways and GPS modules in heavy-duty commercial vehicles with high-energy alternator systems. IC Role / Device Role / Timing Role: Primary transient suppressor on fused battery feed, mounted directly to chassis ground plane. Use Value: Leverages 1.0 °C/W RθJC to dissipate heat into vehicle frame, eliminating need for additional heatsinks. | Use Scenario: Protecting hydraulic control units and sensor hubs in construction and agricultural machinery exposed to severe vibration and thermal cycling. IC Role / Device Role / Timing Role: High-reliability TVS integrated into ruggedized power entry module. Use Value: AEC-Q101 qualification ensures functional integrity after 1000+ thermal cycles from −40 to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ27A | Lower PPPM (400 W), SMA package, RθJC ≈ 50 °C/W, no AEC-Q101 qualification | Not suitable for automotive load dump; limited to low-energy board-level ESD | Select only for cost-sensitive non-automotive 24 V systems with <500 W surge exposure |
| SMCJ27A | Same PPPM (3600 W), SMC package, RθJC ≈ 2.5 °C/W, AEC-Q101 qualified, but larger footprint | Requires more PCB area; less optimal thermal coupling than DO-218AB's direct heatsink mount | Choose when DO-218AB layout space is unavailable but same surge rating and qualification are required |
Compared with SMAJ27A and SMCJ27A, the SM5A27/2D delivers superior thermal performance (RθJC = 1.0 °C/W) and compact DO-218AB packaging optimized for automotive heatsink integration-enabling higher power density and lower system-level thermal resistance in space-constrained under-hood designs.
Availability
SM5A27/2D is available at Aetrix Electronics and suitable for automotive electronics, industrial 24 V power systems, and off-highway equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SM5A27/2D 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 TVS devices for demanding industrial and automotive applications.
The SM5A27/2D belongs to Vishay's PAR® (Planar Anisotropic Rectifier) TVS family, engineered specifically for high-energy automotive load dump protection with emphasis on thermal stability, surge endurance, and AEC-Q101 compliance.
FAQ
What is the clamping voltage of the SM5A27/2D at rated surge current?
The SM5A27/2D has a maximum clamping voltage (VC) of 40.0 V when subjected to a 55 A peak pulse current with a 10 μs/10 ms exponentially decaying waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88381) and ensures downstream components remain within safe operating voltage limits during ISO7637-2 load dump events. The SM5A27/2D maintains this clamping performance across its full operating temperature range.
Is the SM5A27/2D suitable for 12 V automotive systems?
The SM5A27/2D is optimized for 24 V nominal systems (VWM = 22 V, VBR = 27 V), making it unsuitable for primary protection in 12 V architectures where lower standoff and clamping voltages are required. For 12 V applications, Vishay offers variants such as SM5A13/2D (VWM = 11 V). Using SM5A27/2D in a 12 V system would result in insufficient margin between normal rail voltage and VWM, risking premature conduction and power loss.
How is thermal management implemented for the SM5A27/2D?
The SM5A27/2D uses the metal heatsink (Lead 2) as its anode and primary thermal path, achieving RθJC = 1.0 °C/W. Effective thermal management requires soldering the metal tab directly to a large copper pour or external heatsink. The DO-218AB package does not rely on PCB traces alone; thermal performance degrades significantly without this dedicated heatsink interface. Layout guidelines specify minimum pad dimensions and solder coverage per Vishay's recommended mounting pad layout.
Does the SM5A27/2D meet RoHS and halogen-free requirements?
Yes, the SM5A27/2D carries the HE3 suffix, indicating full RoHS compliance per Directive 2011/65/EU and halogen-free status per JEDEC JS709A. The molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards. Whisker resistance is certified to JESD 201 Class 2, confirming long-term reliability in high-vibration automotive environments.
What is the polarity configuration of the SM5A27/2D and how does it affect PCB layout?
The SM5A27/2D is unidirectional with polarity defined as anode = metal heatsink (Lead 2) and cathode = Lead 1. This configuration mandates that the protected line (e.g., battery+) connect to Lead 1 (cathode), while the anode/heatsink must be tied to system ground or chassis. Reversing this connection renders the device nonfunctional as a suppressor. PCB layout must orient the DO-218AB outline accordingly and allocate thermal copper area exclusively under Lead 2.
SM5A27/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5A27/2D FAQ
1.How can I place an order for SM5A27/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5A27/2D 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 SM5A27/2D reliable?
The price and inventory of SM5A27/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5A27/2D is usually 5 days.
3.What payment methods are accepted for SM5A27/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5A27/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5A27/2D?
SM5A27/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5A27/2D 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 SM5A27/2D?
For technical support, including SM5A27/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5A27/2D requirements.
6.How does Aetrix verify that SM5A27/2D is sourced from the original manufacturer or authorized distributors?
All SM5A27/2D 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 SM5A27/2D meets industry standards.
7.What is the process for return or replacement of SM5A27/2D?
All SM5A27/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5A27/2D, 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 SM5A27/2D part is unused and in its original packaging.
Return procedure for SM5A27/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5A27/2D Tags
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