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Vishay General Semiconductor - Diodes Division SM8S22ATHE3/I
- Part No.:
- SM8S22ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S22ATHE3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:366
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Product details
Overview
SM8S22ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 24.4 V (min) to 26.9 V (max) breakdown voltage (VBR), 186 A peak pulse current (IPPM, 10/1000 μs), 35.5 V clamping voltage (VC), 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the SM8S22ATHE3/I datasheet, SM8S22ATHE3/I pinout, SM8S22ATHE3/I application, or SM8S22ATHE3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where junction temperature up to 175 °C, low leakage (<10 μA at VWM = 22 V), and ISO 7637-2 compliance are required.
Technical Context
The SM8S22ATHE3/I employs passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its DO-218AC package integrates a metal heatsink as the anode terminal, enabling direct thermal coupling to PCB copper for efficient heat dissipation at TJ = 175 °C.
It delivers 6600 W surge capability with 10/1000 μs waveform and 5200 W with 10/10 000 μs waveform, meeting automotive load dump requirements per ISO 7637-2. The device exhibits a positive temperature coefficient of VBR (αT = 0.086 %/°C), ensuring predictable voltage shift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 24.4 V / 26.9 V - Ensures reliable triggering above 22 V stand-off while maintaining margin against system transients. |
| VC @ IPPM | 35.5 V - Clamps 12 V automotive bus surges to safe levels for downstream 36 V-rated components. |
| IPPM (10/1000 μs) | 186 A - Supports high-energy load dump events without degradation in AEC-Q101 qualified operation. |
| PPPM (10/1000 μs) | 6600 W - Enables single-device protection for alternator-induced surges in modern vehicle architectures. |
| TJ max. | 175 °C - Allows placement near hot engine control units without derating concerns in under-hood environments. |
| VWM | 22 V - Matches nominal 24 V system operating voltage with 10 % margin before conduction begins. |
| RθJC | 0.90 °C/W - Enables effective thermal management via heatsink-mounted PCB layout in high-power applications. |
Pinout & Package
Package: DO-218AC - Surface-mount, anode-heatsink configuration with matte tin-plated leads; meets UL 94 V-0, MSL Level 1, JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit's positive rail; carries full surge current during clamping. |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to PCB ground plane; serves as primary thermal path and return node. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across -55 °C to +175 °C, including temperature cycling and humidity testing. |
| ISO 7637-2 compliance | Meets Pulse 5a/b load dump test profiles for 12 V and 24 V systems without external filtering. |
| Low leakage at VWM | <10 μA at 22 V and 25 °C - Minimizes standby power loss in always-on vehicle modules. |
| Passivated anisotropic rectifier | Reduces parameter drift over lifetime and improves consistency in high-humidity under-hood conditions. |
| Heatsink-integrated anode | Enables >8 W continuous power dissipation on infinite heatsink, supporting sustained surge duty cycles. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Supply Protection |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load dump surges during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed upstream of DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤35.5 V, preventing latch-up or damage to 36 V-rated power management ICs. |
Use Scenario: Shields BCM power rail from inductive switching spikes generated by door lock actuators and lighting relays. IC Role / Device Role / Timing Role: Primary surge suppression element on main 12 V supply line before LDO regulators. Use Value: Withstands 186 A pulses without degradation, ensuring long-term reliability in high-cycle automotive modules. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Guards image sensor and SerDes interface power against ignition-induced transients in front-end camera assemblies. IC Role / Device Role / Timing Role: Fast-response TVS suppressing sub-microsecond spikes before they reach sensitive analog front-ends. Use Value: Low clamping voltage (35.5 V) preserves headroom for 3.3 V/5 V logic rails powered from local DC/DC stages. |
Use Scenario: Safeguards EPS motor driver ICs and MCU supply from high-current load dump events during steering assist activation. IC Role / Device Role / Timing Role: High-power TVS mounted directly to chassis-grounded heatsink layer on multilayer PCB. Use Value: 0.90 °C/W thermal resistance enables stable operation at 175 °C junction temperature during prolonged maneuvers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S22AHM3 | Same VBR, VC, and PPPM; uses HM3 suffix indicating halogen-free molding compound and enhanced moisture sensitivity level handling. | Preferred for new designs targeting RoHS+halogen-free compliance and extended MSL robustness beyond J-STD-020 Level 1. | Select SM8S22AHM3 when initiating new automotive programs requiring updated material specifications and longer floor life. |
| SMAJ22A | Lower PPPM (400 W vs. 6600 W); smaller SMA package; no AEC-Q101 qualification; VC = 35.5 V same but IPPM = 11.3 A only. | Limited to low-energy consumer or industrial applications; unsuitable for automotive load dump or ISO 7637-2 compliance. | Use SMAJ22A only in non-automotive contexts where surge energy is <100 mJ and AEC-Q101 is not required. |
Compared with SM8S22ATHE3/I, SM8S22AHM3 offers identical electrical performance with improved environmental compliance, while SMAJ22A provides basic clamping at drastically reduced surge capacity and qualification scope-making it incompatible for automotive deployment.
Availability
SM8S22ATHE3/I is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) design, and body control module (BCM) development requiring stable component supply and long-term lifecycle support.
Supply support for SM8S22ATHE3/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 diodes, rectifiers, TVS devices, and power MOSFETs for high-reliability applications.
The SM8S series is engineered specifically for automotive-grade transient suppression, emphasizing high-temperature operation, ISO 7637-2 compliance, and AEC-Q101 qualification in surface-mount form factors.
FAQ
What is the maximum clamping voltage of the SM8S22ATHE3/I under rated surge conditions?
The SM8S22ATHE3/I has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 186 A using the 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 87734) and ensures compatibility with 36 V-rated downstream components in automotive 12 V systems. The SM8S22ATHE3/I maintains this clamping performance across its full operating temperature range.
Is the SM8S22ATHE3/I suitable for new automotive designs despite the "Not For New Designs" note in the datasheet?
The "Not For New Designs" designation applies to the entire SM8SxxAT family and indicates Vishay recommends the newer SM8SxxAHM3 series for future projects. However, the SM8S22ATHE3/I remains fully qualified (AEC-Q101), in active production, and supported for legacy program continuity and existing design refreshes. Its electrical and thermal specs are unchanged, and SM8S22ATHE3/I continues to meet ISO 7637-2 and automotive reliability requirements.
How does the DO-218AC package of the SM8S22ATHE3/I improve thermal performance compared to SMA or SMC packages?
The DO-218AC package of the SM8S22ATHE3/I integrates a large metal heatsink as the anode terminal, achieving a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W-over 5× lower than SMA packages (~5–6 °C/W). This allows the SM8S22ATHE3/I to dissipate 8 W continuously on an infinite heatsink and sustain repeated 6600 W surges without thermal runaway. The heatsink also simplifies PCB thermal design by enabling direct mounting to ground planes.
Does the SM8S22ATHE3/I meet ISO 7637-2 Pulse 5a and 5b requirements out-of-the-box?
Yes-the SM8S22ATHE3/I is explicitly characterized to meet ISO 7637-2 for load dump protection under varied test conditions, including Pulse 5a (12 V systems) and Pulse 5b (24 V systems), as confirmed in the Vishay datasheet (Section "FEATURES"). Its 6600 W peak pulse power rating and 35.5 V clamping voltage enable compliance without additional RC snubbers or staged protection networks in most automotive applications.
What is the polarity configuration and terminal identification for the SM8S22ATHE3/I?
The SM8S22ATHE3/I is unidirectional with the metal heatsink serving as the anode and Lead 1 as the cathode. Polarity is marked on the device body with a band adjacent to Lead 1 (cathode). The heatsink must be soldered to a large copper area tied to system ground to ensure both electrical return and thermal dissipation. This configuration is fixed and cannot be used in bidirectional configurations without external circuitry.
SM8S22ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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-218AC
SM8S22ATHE3/I FAQ
1.How can I place an order for SM8S22ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22ATHE3/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 SM8S22ATHE3/I reliable?
The price and inventory of SM8S22ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S22ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S22ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22ATHE3/I?
SM8S22ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22ATHE3/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 SM8S22ATHE3/I?
For technical support, including SM8S22ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22ATHE3/I requirements.
6.How does Aetrix verify that SM8S22ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S22ATHE3/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 SM8S22ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S22ATHE3/I?
All SM8S22ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22ATHE3/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 SM8S22ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S22ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S22ATHE3/I Tags
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