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Vishay General Semiconductor - Diodes Division SM8S22-E3/2D
- Part No.:
- SM8S22-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S22-E3/2D.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,517
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Product details
Overview
SM8S22-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for automotive load dump protection. It features a 22.0 V stand-off voltage (VWM), 39.4 V maximum clamping voltage (VC) at 168 A peak pulse current, and 6600 W peak pulse power (10/1000 µs), operating up to TJ = 175 °C.
For engineers reviewing the SM8S22-E3/2D datasheet, SM8S22-E3/2D pinout, SM8S22-E3/2D application, or SM8S22-E3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance, ISO7637-2 compliance, AEC-Q101 qualification, and junction-to-case thermal resistance of 0.90 °C/W.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low leakage (<10 µA at VWM). Its unidirectional configuration and heatsink-anode polarity enable direct mounting to metal chassis for efficient thermal dissipation in automotive power rail protection.
The device delivers 6600 W surge capability under 10/1000 µs waveform and sustains 5200 W under 10/10 000 µs waveform-critical for load dump transients per ISO7637-2. Its MSL Level 1 rating and 245 °C lead-free reflow compatibility support automated SMT assembly.
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 168 A peak pulse current, limiting downstream IC stress |
| PPPM (10/1000 µs) | 6600 W - Peak transient energy absorption capacity for short-duration load dumps |
| TJ max. | 175 °C - Enables operation in under-hood automotive environments without derating |
| RθJC | 0.90 °C/W - Low thermal resistance enables effective heat transfer to heatsink or PCB copper |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive-grade reliability and lifetime validation |
| Package | DO-218AB - Surface-mount outline with metal heatsink terminal (anode) for thermal and mechanical robustness |
Pinout & Package
Package: DO-218AB - asymmetrical surface-mount package with two terminals: Lead 1 (cathode) and Lead 2 / Metal Heatsink (anode). The metal base serves as both electrical anode connection and primary thermal path to PCB or heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit's positive rail; carries transient current into anode during clamping |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to system ground or chassis; primary heat conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Enables precise placement on DC power rails where reverse conduction must be blocked |
| Junction passivation | Ensures stable leakage <10 µA at VWM across temperature and lifetime, critical for low-power standby circuits |
| ISO7637-2 compliance | Validated for automotive load dump waveforms, including 10 ms exponential surges up to 5200 W |
| MSL Level 1 | Allows unlimited floor life and supports 245 °C peak reflow without moisture-induced failure |
| RoHS & Halogen-Free | Meets JEDEC JS709A and EU Directive 2011/65/EU, enabling use in environmentally regulated automotive programs |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects ECU microcontroller and CAN transceivers from 12 V battery line transients during alternator load dump events. IC Role / Device Role: Unidirectional TVS placed between battery input and bulk capacitor, clamping surges before LDOs and digital ICs. Use Value: Limits voltage to ≤39.4 V at 168 A, preventing latch-up or overvoltage damage to 5 V/3.3 V logic supplies. |
Use Scenario: Shields BCM power management ICs and relay drivers from switching spikes generated by HVAC, lighting, and window motors. IC Role / Device Role: Primary surge suppression element on 12 V main input, mounted directly to metal chassis for thermal relief. Use Value: Delivers 6600 W peak power handling with 0.90 °C/W RθJC, maintaining safe junction temperature during repeated 100 ms transients. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Infotainment Head Unit Power Supply |
Use Scenario: Safeguards image sensor and SerDes interface ICs in rear-view or surround-view cameras exposed to vehicle-level EMI and load dump. IC Role / Device Role: First-line transient suppressor upstream of DC-DC converters, leveraging DO-218AB's low-inductance layout. Use Value: Achieves <10 µA leakage at 22 V, preserving low-quiescent-current sleep mode integrity in always-on camera systems. |
Use Scenario: Secures USB-C PD controllers, audio codecs, and display drivers against ignition-on surges and jump-start transients. IC Role / Device Role: High-energy TVS integrated into front-end power stage with thermal coupling to aluminum heat spreader. Use Value: AEC-Q101 qualification ensures zero infant mortality and validated lifetime performance across -40 °C to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5AT | Lower PPPM (400 W), SMA package, 32.4 V VC @ 12.3 A, RθJC not specified | Not suitable for ISO7637-2 load dump; limited to lower-energy transients like ESD or inductive switching | Select when space-constrained layouts require smaller footprint and surge energy is ≤400 W |
| TPSMD22A | Same VWM/VC, but DO-214AB package, 5.0 kW PPPM, no AEC-Q101 qualification | Lacks automotive qualification and 175 °C junction rating; intended for industrial/commercial use only | Choose for cost-sensitive non-automotive designs where AEC-Q101 and extended temperature are not required |
Compared with SMAJ22A-E3/5AT and TPSMD22A, the SM8S22-E3/2D provides 16.5× higher surge power, guaranteed AEC-Q101 qualification, and superior thermal performance via DO-218AB's metal heatsink-making it the only option qualified for under-hood automotive load dump protection.
Availability
SM8S22-E3/2D is available at Aetrix Electronics and suitable for automotive ECU protection, body control module hardening, and ADAS camera power conditioning requiring stable component supply across long production lifecycles.
Supply support for SM8S22-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM8S series is part of Vishay's PAR® TVS platform, engineered specifically for automotive-grade transient suppression in 12 V and 24 V systems-emphasizing high-temperature operation, ISO7637-2 compliance, and robust thermal design.
FAQ
What is the clamping voltage of the SM8S22-E3/2D at its rated peak pulse current?
The SM8S22-E3/2D has a maximum clamping voltage (VC) of 39.4 V at its rated peak pulse current (IPPM) of 168 A under a 10/1000 µs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88387) and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Is the SM8S22-E3/2D qualified for automotive applications?
Yes, the SM8S22-E3/2D is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO7637-2 load dump requirements, operates up to 175 °C junction temperature, and is rated for MSL Level 1 reflow-making it suitable for engine control units, body modules, and ADAS systems where reliability is mission-critical.
What package does the SM8S22-E3/2D use, and how is polarity configured?
The SM8S22-E3/2D uses the DO-218AB surface-mount package. Polarity is unidirectional, with Lead 1 as cathode and Lead 2 (metal heatsink base) as anode. This configuration requires correct orientation on the PCB to ensure proper clamping direction and optimal thermal conduction to the heatsink or copper plane.
Does the SM8S22-E3/2D meet RoHS and halogen-free standards?
Yes, the SM8S22-E3/2D is RoHS-compliant per EU Directive 2011/65/EU and halogen-free per JEDEC JS709A. The "HE3" suffix in the full part number confirms compliance, and the matte tin-plated leads satisfy J-STD-002 solderability requirements.
What is the thermal resistance from junction to case for the SM8S22-E3/2D?
The SM8S22-E3/2D has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W, measured under TC = 25 °C conditions. This low value enables efficient heat transfer from the silicon die to the metal heatsink terminal, supporting sustained operation under high-energy transients when properly mounted.
SM8S22-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):
- 168A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S22-E3/2D FAQ
1.How can I place an order for SM8S22-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22-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 SM8S22-E3/2D reliable?
The price and inventory of SM8S22-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 SM8S22-E3/2D is usually 5 days.
3.What payment methods are accepted for SM8S22-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22-E3/2D?
SM8S22-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22-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 SM8S22-E3/2D?
For technical support, including SM8S22-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22-E3/2D requirements.
6.How does Aetrix verify that SM8S22-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S22-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 SM8S22-E3/2D meets industry standards.
7.What is the process for return or replacement of SM8S22-E3/2D?
All SM8S22-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22-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 SM8S22-E3/2D part is unused and in its original packaging.
Return procedure for SM8S22-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S22-E3/2D Tags
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