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Vishay General Semiconductor - Diodes Division SM5S22-E3/2D
- Part No.:
- SM5S22-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S22-E3/2D.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,866
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Product details
Overview
SM5S22-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AB package, rated for 22 V stand-off voltage (VWM), 39.4 V maximum clamping voltage (VC) at 91 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified, supports 175 °C junction operation, and is designed for automotive load dump protection.
For engineers reviewing the SM5S22-E3/2D datasheet, SM5S22-E3/2D pinout, SM5S22-E3/2D application, or SM5S22-E3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB thermal performance (RθJC = 1.0 °C/W), ISO7637-2 compliance, low leakage (<10 µA at VWM), and 500 A IFSM surge rating.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under high-temperature transients. Its unidirectional configuration provides forward conduction path with VF ≤ 2.0 V at 100 A, enabling robust protection during load dump events where reverse-biased clamping and forward surge handling are both required.
The device operates across –55 °C to +175 °C junction temperature range and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak. Its DO-218AB case features a metal heatsink terminal (anode) and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VC @ IPPM | 39.4 V - Clamped voltage at 91 A peak pulse current ensures downstream ICs see <40 V during 10/1000 µs surge |
| PPPM (10/1000 µs) | 3600 W - High-energy surge handling capability suitable for ISO7637-2 Load Dump Pulse 5a |
| TJ max. | +175 °C - Enables placement near hot engine control units without derating concerns |
| ID @ VWM | <10 µA - Low leakage preserves battery life in always-on automotive modules |
| RθJC | 1.0 °C/W - Efficient heat transfer to PCB copper or external heatsink via metal case |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended metal heatsink case with anode connected to heatsink base; RoHS-compliant, AEC-Q101 qualified, UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Signal-side connection; reverse-biased during clamping; routed to protected line (e.g., 12 V rail) |
| Lead 2 / Metal Heatsink | Anode | Ground reference and primary thermal path; must be soldered to large copper pour or chassis ground |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR and low leakage over lifetime and temperature cycling in automotive environments |
| AEC-Q101 qualification | Validated reliability for automotive powertrain and body electronics per stress test requirements |
| Meets ISO7637-2 surge specification | Specifically validated for Load Dump Pulse 5a (10 ms exponential waveform) up to 3600 W |
| MSL Level 1 rating | Allows standard SMT reflow without moisture sensitivity concerns (peak 245 °C) |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Line Protection |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load dump surges during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse transients while conducting forward surge current through heatsink. Use Value: Withstands 3600 W pulses and maintains clamping below 40 V, preventing damage to MCU and CAN transceivers. | Use Scenario: Shields BCM microcontroller and LIN transceivers from battery line transients during ignition switching. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed at main power entry point before LDO regulators. Use Value: Low 10 µA leakage at 22 V minimizes standby current draw; 175 °C rating supports under-hood mounting. |
| ADAS Camera Power Supply Protection | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Safeguards 12 V supply to image sensor and ISP in front-facing camera modules. IC Role / Device Role / Timing Role: Primary transient suppressor on camera module PCB, mounted directly to ground plane. Use Value: DO-218AB's 1.0 °C/W RθJC enables effective thermal management in compact sealed housings. | Use Scenario: Protects gate drivers and current sense amplifiers in EPS motor control board from inductive kickback. IC Role / Device Role / Timing Role: Clamp placed across H-bridge supply rails to absorb energy from motor coil collapse. Use Value: 500 A IFSM rating handles repetitive 8.3 ms half-sine surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A | Lower PPPM (400 W vs. 3600 W); SMA package (RθJC ≈ 45 °C/W); bidirectional option available | Not suitable for load dump; limited to lower-energy ESD/surge events | Select only for non-automotive, low-power signal-line protection where space is constrained |
| TPSMA6L22A-Q1 | Automotive-grade (AEC-Q101); same VWM/VC specs; DO-214AC package; lower PPPM (600 W) | Lacks ISO7637-2 validation; insufficient for load dump; better for ESD + fast transients | Prefer for infotainment or ADAS sensor interfaces needing tighter tolerance but lower surge energy |
Compared with SMAJ22A-E3/5A and TPSMA6L22A-Q1, SM5S22-E3/2D delivers 6× higher surge power handling and superior thermal dissipation-critical for automotive power rail protection where sustained energy absorption and junction temperature stability determine field reliability.
Availability
SM5S22-E3/2D is available at Aetrix Electronics and suitable for automotive power systems, engine control units, and body electronics requiring stable component supply with AEC-Q101 qualification and ISO7637-2 compliance.
Supply support for SM5S22-E3/2D 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade performance.
The SM5S series is part of Vishay's PAR® TVS platform, engineered specifically for high-energy automotive load dump protection in harsh under-hood environments.
FAQ
What is the clamping voltage of SM5S22-E3/2D at its rated peak pulse current?
The SM5S22-E3/2D has a maximum clamping voltage (VC) of 39.4 V when subjected to its specified peak pulse current (IPPM) of 91 A using a 10/1000 µs waveform. This value is measured per the conditions defined in the Vishay datasheet Document Number 88382 and ensures protected circuitry remains within safe voltage limits during standardized surge events.
Is SM5S22-E3/2D suitable for bidirectional transient protection?
No, SM5S22-E3/2D is unidirectional only, with polarity marked by cathode band on Lead 1 and anode connected to the metal heatsink (Lead 2). It is not rated for reverse conduction and must be installed with correct orientation on the PCB. For bidirectional protection, consider the SM5S22A-E3/2D variant, which offers symmetrical clamping.
Does SM5S22-E3/2D meet automotive qualification standards?
Yes, SM5S22-E3/2D is AEC-Q101 qualified and meets ISO7637-2 Load Dump Pulse 5a requirements. It is rated for operation from –55 °C to +175 °C and complies with MSL Level 1 per J-STD-020, making it suitable for engine bay and transmission control applications.
What is the thermal resistance from junction to case for SM5S22-E3/2D?
The typical thermal resistance from junction to case (RθJC) for SM5S22-E3/2D is 1.0 °C/W, as specified in the Vishay datasheet. This low value is enabled by the DO-218AB package's direct metal heatsink contact, allowing efficient heat transfer to PCB copper or external thermal mass.
How is the polarity configured on SM5S22-E3/2D?
SM5S22-E3/2D has unidirectional polarity: the cathode is on Lead 1 (marked with a band), and the anode is connected to the metal heatsink base (Lead 2). The heatsink must be electrically tied to system ground to ensure proper clamping behavior during transients.
SM5S22-E3/2D 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):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 91A
- 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
SM5S22-E3/2D FAQ
1.How can I place an order for SM5S22-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S22-E3/2D 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 SM5S22-E3/2D reliable?
The price and inventory of SM5S22-E3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S22-E3/2D is usually 5 days.
3.What payment methods are accepted for SM5S22-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S22-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S22-E3/2D?
SM5S22-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S22-E3/2D 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 SM5S22-E3/2D?
For technical support, including SM5S22-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S22-E3/2D requirements.
6.How does Aetrix verify that SM5S22-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S22-E3/2D 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 SM5S22-E3/2D meets industry standards.
7.What is the process for return or replacement of SM5S22-E3/2D?
All SM5S22-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S22-E3/2D, 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 SM5S22-E3/2D part is unused and in its original packaging.
Return procedure for SM5S22-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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