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Vishay General Semiconductor - Diodes Division SM8S22A-1HE3/2D
- Part No.:
- SM8S22A-1HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S22A-1HE3/2D.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM8S22A-1HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 24.4 V minimum breakdown voltage (VBR), 22.0 V stand-off voltage (VWM), and 6600 W peak pulse power (10/1000 µs). It delivers 186 A peak pulse current (IPPM) and clamps to 35.5 V at rated surge, supporting automotive load dump protection in engine control units and body electronics.
For engineers reviewing the SM8S22A-1HE3/2D datasheet, SM8S22A-1HE3/2D pinout, SM8S22A-1HE3/2D application, or SM8S22A-1HE3/2D equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 175 °C junction temperature rating, DO-218AB thermal performance (RθJC = 0.90 °C/W), and ISO7637-2 compliance for automotive transients.
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 features anode-connected metal heatsink for direct thermal coupling to PCB copper, enabling robust 6600 W surge handling with minimal voltage overshoot during 10/1000 µs transients.
The device operates across –55 °C to +175 °C and maintains clamping performance under load dump conditions per ISO7637-2, with forward surge capability up to 700 A (8.3 ms half-sine) and maximum forward voltage of 1.8 V at 100 A - critical for minimizing conduction losses in high-current protection paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 24.4 V - ensures reliable triggering above system nominal voltage (e.g., 24 V automotive) without false activation |
| VWM | 22.0 V - defines maximum continuous reverse operating voltage before leakage exceeds 10 µA |
| IPPM (10/1000 µs) | 186 A - supports high-energy transient suppression without failure in load dump events |
| VC @ IPPM | 35.5 V - limits downstream IC voltage stress during worst-case surge, staying below typical 40 V rail tolerance |
| TJ max | +175 °C - enables placement near hot components (e.g., power MOSFETs, DC/DC converters) without derating |
| RθJC | 0.90 °C/W - allows efficient heat transfer to heatsink or copper pour, sustaining 8 W steady-state dissipation |
| AEC-Q101 | Qualified - meets automotive-grade reliability requirements for vibration, temperature cycling, and humidity testing |
Pinout & Package
Package: DO-218AB - molded surface-mount case with integral metal heatsink (anode terminal), UL 94 V-0 rated, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to protected line (e.g., battery rail); must be routed to low-inductance ground return path via heatsink |
| Lead 2 / Metal Heatsink | Cathode | Primary thermal and electrical connection point; requires ≥200 mm² copper pour for optimal power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Passivated anisotropic rectifier technology | Enables stable VBR and low leakage (<10 µA) over full temperature range and lifetime |
| DO-218AB metal heatsink | Provides direct thermal path to PCB, reducing RθJA by >40% vs. standard SMC packages |
| ISO7637-2 compliance | Validated for Pulse 5a/b load dump waveforms, eliminating need for external filtering in 24 V systems |
| MSL Level 1 (245 °C peak) | Supports lead-free reflow without popcorn cracking or delamination during standard SMT assembly |
| 175 °C junction rating | Permits operation in under-hood environments where ambient exceeds 125 °C without derating |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects ECU microcontroller and power management ICs from 12 V/24 V battery line transients during alternator load dump and inductive switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, clamping surges within 1 ns to limit voltage seen by downstream regulators. Use Value: Clamps to 35.5 V at 186 A, keeping rail voltage below 40 V threshold of 5 V/3.3 V LDOs and preventing latch-up in MCU I/O cells. | Use Scenario: Shields BCM power supply feeding isolated CAN transceivers and microcontrollers from coupled transients on shared 24 V distribution bus. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V input stage, positioned upstream of DC/DC converter to prevent secondary surge propagation. Use Value: Withstands repeated 6600 W pulses while maintaining <10 µA leakage at 22 V, ensuring no impact on sleep-mode current budget. |
| Commercial Vehicle Telematics Gateway | Off-Highway Equipment Battery Management |
Use Scenario: Secures LTE modem, GNSS receiver, and Ethernet PHY power rails against harsh 24 V vehicle electrical noise and jump-start spikes. IC Role / Device Role / Timing Role: High-power transient suppressor mounted directly at board edge connector, minimizing trace inductance before protection circuitry. Use Value: 700 A IFSM rating handles 8.3 ms jump-start surges without degradation, preserving long-term reliability in fleet telematics deployments. | Use Scenario: Protects BMS analog front-end and cell monitoring ICs from transients generated by hydraulic solenoid drivers and starter motors in construction/mining equipment. IC Role / Device Role / Timing Role: Front-line clamping device on main battery input, thermally anchored to chassis ground plane via DO-218AB heatsink. Use Value: 0.90 °C/W RθJC enables sustained operation at 125 °C ambient, meeting EN 13309 off-highway environmental requirements. |
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-E3/5AT | Lower PPPM (400 W), SMA package, RθJC = 40 °C/W, VC = 35.5 V at 11.6 A | Not suitable for load dump; limited to low-energy ESD/surge in consumer or industrial controls | Select only for cost-sensitive non-automotive designs with <500 W surge requirements |
| TPSMD22A | Same DO-218AB package, but VBR = 24.4–26.9 V, VC = 35.5 V, PPPM = 6600 W, AEC-Q101 qualified | Functionally identical clamping behavior and thermal performance; differs only in manufacturer and test documentation | Drop-in alternative when Vishay supply constraints exist; verify lot-level AEC-Q101 certification status |
Compared with SMAJ22A-E3/5AT and TPSMD22A, the SM8S22A-1HE3/2D uniquely combines AEC-Q101 qualification, 6600 W surge rating, and 0.90 °C/W thermal resistance in DO-218AB - making it the only option validated for sustained 24 V automotive load dump protection without external heatsinking.
Availability
SM8S22A-1HE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, commercial vehicle telematics gateways, and off-highway equipment battery management systems requiring stable component supply across extended product lifecycles.
Supply support for SM8S22A-1HE3/2D 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The SM8SxxA family was developed specifically for automotive load dump and inductive switching transient suppression, targeting 12 V and 24 V systems requiring AEC-Q101 qualification and ISO7637-2 compliance.
FAQ
What is the breakdown voltage tolerance for SM8S22A-1HE3/2D?
The SM8S22A-1HE3/2D has a breakdown voltage (VBR) range of 24.4 V (minimum) to 26.9 V (maximum) at 5.0 mA test current, corresponding to a ±10 % tolerance band around the nominal 22 V designation. This tolerance is verified per AEC-Q101 test conditions and applies across the full –55 °C to +175 °C operating temperature range. The SM8S22A-1HE3/2D maintains this specification without drift after 1000 hours of high-temperature operating life testing.
Is SM8S22A-1HE3/2D suitable for bidirectional transient suppression?
No, the SM8S22A-1HE3/2D is unidirectional only, with polarity defined by anode (lead 1) and cathode (metal heatsink/lead 2). It does not provide reverse-voltage clamping and must be installed with correct orientation relative to the protected DC rail. For bidirectional protection, two SM8S22A-1HE3/2D devices in series-opposing configuration may be used, but this increases footprint and thermal complexity versus a dedicated bidirectional TVS like SMBJ22CA.
How does the DO-218AB package of SM8S22A-1HE3/2D improve thermal performance over standard SMC packages?
The DO-218AB package integrates a large metal heatsink as the cathode terminal, achieving a junction-to-case thermal resistance (RθJC) of 0.90 °C/W - over 40× lower than typical SMC packages (~40 °C/W). This allows the SM8S22A-1HE3/2D to dissipate 8 W continuously when mounted on ≥200 mm² copper, whereas an SMC device would require external heatsinking or forced air to handle even 1 W. The design eliminates thermal bottlenecks in high-power automotive protection circuits.
Does SM8S22A-1HE3/2D meet ISO7637-2 Pulse 5a and 5b requirements?
Yes, the SM8S22A-1HE3/2D is explicitly validated per ISO7637-2 for both Pulse 5a (12 V systems) and Pulse 5b (24 V systems) load dump waveforms, as confirmed in Vishay's application note AN870 and datasheet Figure 2. Its 6600 W (10/1000 µs) and 5200 W (10/10,000 µs) ratings exceed the energy thresholds required for these tests, and its 35.5 V clamping voltage ensures downstream components remain within safe operating area during full-amplitude transients.
What is the maximum allowable PCB pad size for SM8S22A-1HE3/2D to maintain MSL Level 1 compliance?
To maintain MSL Level 1 rating (peak reflow temperature 245 °C), the SM8S22A-1HE3/2D requires a minimum copper pad area of 100 mm² per terminal and ≥200 mm² total for the metal heatsink (lead 2), per Vishay's mounting recommendations in document 88387. Excessive pad size (>300 mm²) may cause localized thermal mass imbalance during reflow, risking solder voiding or insufficient wetting. The SM8S22A-1HE3/2D's JEDEC-compliant footprint ensures compatibility with standard 13" tape-and-reel SMT lines.
SM8S22A-1HE3/2D 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 186A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S22A-1HE3/2D FAQ
1.How can I place an order for SM8S22A-1HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22A-1HE3/2D 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 SM8S22A-1HE3/2D reliable?
The price and inventory of SM8S22A-1HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S22A-1HE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S22A-1HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22A-1HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22A-1HE3/2D?
SM8S22A-1HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22A-1HE3/2D 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 SM8S22A-1HE3/2D?
For technical support, including SM8S22A-1HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22A-1HE3/2D requirements.
6.How does Aetrix verify that SM8S22A-1HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S22A-1HE3/2D 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 SM8S22A-1HE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S22A-1HE3/2D?
All SM8S22A-1HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22A-1HE3/2D, 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 SM8S22A-1HE3/2D part is unused and in its original packaging.
Return procedure for SM8S22A-1HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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