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Vishay General Semiconductor - Diodes Division SM5S22HE3/2D
- Part No.:
- SM5S22HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S22HE3/2D.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,872
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Product details
Overview
SM5S22HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in high-reliability 12 V and 24 V systems. It features a 22.0 V stand-off voltage (VWM), 24.4–29.8 V breakdown voltage (VBR) at 5 mA, 39.4 V maximum clamping voltage (VC) at 91 A peak pulse current, and 3600 W peak pulse power (10/1000 μs). Its DO-218AB package supports junction temperatures up to +175 °C and meets AEC-Q101 qualification.
For engineers reviewing the SM5S22HE3/2D datasheet, SM5S22HE3/2D pinout, SM5S22HE3/2D application, or SM5S22HE3/2D equivalent, key selection criteria include unidirectional polarity, 175 °C junction rating, ISO7637-2 compliance for load dump transients, low leakage (<10 μA at VWM), and thermal resistance of 1.0 °C/W (junction-to-case).
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive electronics, activating above its breakdown voltage to shunt surge energy to ground. Its passivated anisotropic rectifier structure ensures stable performance under repeated high-temperature stress and automotive thermal cycling.
The device is rated for 500 A non-repetitive forward surge current (8.3 ms half-sine), delivers 3600 W peak pulse power (10/1000 μs), and maintains ≤2.0 V forward voltage at 100 A - enabling robust protection against inductive switching transients and battery load dump events in engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system working margin in 24 V automotive circuits. |
| VBR (min/max) | 24.4 V / 29.8 V at 5 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 39.4 V at 91 A (10/1000 μs) - Clamping voltage limits downstream IC stress during worst-case transients per ISO7637-2. |
| PPPM (10/1000 μs) | 3600 W - Peak surge handling capacity sufficient for severe load dump events in 12 V/24 V vehicle architectures. |
| TJ max. | +175 °C - Enables placement near hot components (e.g., power modules, ECUs) without derating concerns. |
| RθJC | 1.0 °C/W - Low thermal resistance allows effective heat transfer to PCB copper or heatsink, supporting sustained power dissipation. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended case with integral metal heatsink (anode terminal); RoHS-compliant matte tin-plated leads; MSL Level 1 (245 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries clamped surge current during overvoltage events. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical return; must be soldered to large copper area for thermal management and low-inductance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Stable VBR and low leakage (<10 μA at VWM, 25 °C) maintained after 1000 hrs at TJ = 175 °C. |
| High surge capability (3600 W) | Withstands ≥100 load dump pulses (ISO7637-2 Pulse 5a) without parameter shift or failure. |
| Low forward voltage drop (≤2.0 V @ 100 A) | Minimizes power loss and self-heating during high-current surge events, preserving clamping integrity. |
| DO-218AB mechanical robustness | UL 94 V-0 molding compound and JESD201 Class 2 whisker resistance ensure long-term reliability in vibration-prone environments. |
| Uni-directional polarity | Optimized for DC-biased protection paths where reverse conduction is not required - simplifies layout vs. bi-directional alternatives. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) LIN Bus Line Protection |
|---|---|
Use Scenario: Protects microcontroller power rails and CAN/LIN transceivers from battery load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery feed and input filter capacitor. Use Value: Limits transient voltage to ≤39.4 V, preventing latch-up or damage to 3.3 V/5 V logic and analog front-ends in AEC-Q100 qualified ICs. |
Use Scenario: Shields LIN physical layer transceivers from coupled noise and short-duration spikes on shared 12 V supply lines. IC Role / Device Role / Timing Role: Parallel-connected TVS on VCC line upstream of LIN transceiver regulator. Use Value: Clamps surges within 1 ns response time while maintaining <10 μA leakage at 12 V - avoiding false wake-up or communication errors. |
| Automotive Lighting Driver Output Protection | Start-Stop System Battery Interface Protection |
Use Scenario: Guards MOSFET gate drivers and current-sense amplifiers in LED headlamp modules against inductive kickback from relay or solenoid switching. IC Role / Device Role / Timing Role: TVS placed across driver output or supply rail to absorb 50–100 A spikes. Use Value: Withstands 500 A IFSM (8.3 ms) and delivers 3600 W PPPM - ensuring survival during repeated lamp-on transients. |
Use Scenario: Protects supercapacitor charging circuits and buck-boost converters in 12 V start-stop systems exposed to cranking-induced voltage dips and rebounds. IC Role / Device Role / Timing Role: Bidirectional protection is unnecessary; unidirectional SM5S22HE3/2D suffices for positive-rail clamping only. Use Value: 175 °C TJ rating enables direct mounting on converter heatsinks, eliminating thermal interface layers and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5AT | DO-214AC (SMA) package; 22 V VWM; 36.8 V VC @ 52.5 A; 400 W PPPM (10/1000 μs); lower surge rating and thermal mass. | Limited to low-energy transients (e.g., ESD, minor switching noise); unsuitable for full load dump per ISO7637-2. | Select when space-constrained layouts require smaller footprint and surge demands are ≤400 W. |
| TPSMD22A | DO-218AB package; same VWM (22 V); 37.5 V VC @ 96 A; 3600 W PPPM; AEC-Q101 qualified; tighter VBR tolerance (±5 % vs. ±10 %). | Offers improved clamping consistency and identical mechanical fit - direct replacement where tighter parametric control is needed. | Prefer when production requires tighter VBR distribution or enhanced process traceability under IATF 16949. |
Compared with SMAJ22A-E3/5AT, SM5S22HE3/2D provides 9× higher surge power and automotive-grade thermal endurance; versus TPSMD22A, it trades tighter VBR tolerance for broader availability and established field history in Tier-1 ECU designs.
Availability
SM5S22HE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body electronics modules, and lighting driver systems requiring stable component supply with AEC-Q101 qualification and high-temperature reliability.
Supply support for SM5S22HE3/2D 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 passive components for automotive, industrial, and computing markets.
The SM5Sxx series was engineered specifically for automotive load dump protection, combining high-temperature stability (TJ = 175 °C), ISO7637-2 compliance, and DO-218AB thermal efficiency to replace older axial-leaded TVS solutions in modern ECU designs.
FAQ
What is the polarity configuration of the SM5S22HE3/2D?
The SM5S22HE3/2D is a unidirectional TVS diode with anode connected to the metal heatsink (Lead 2) and cathode at Lead 1. This configuration allows it to clamp only positive-going transients on DC-biased lines, making it ideal for protecting 12 V or 24 V automotive power rails where reverse voltage is not expected. Its polarity is fixed and cannot be used in bi-directional applications without external circuitry.
Does the SM5S22HE3/2D meet ISO7637-2 requirements for automotive load dump?
Yes, the SM5S22HE3/2D meets ISO7637-2 surge specification under defined test conditions - specifically Pulse 5a (load dump), validated with 3600 W peak pulse power (10/1000 μs) and 2800 W (10/10 000 μs). Its 39.4 V clamping voltage at 91 A ensures downstream electronics remain within safe operating limits during standardized vehicle-level transients.
What is the thermal resistance and recommended PCB layout for the SM5S22HE3/2D?
The SM5S22HE3/2D has a typical junction-to-case thermal resistance (RθJC) of 1.0 °C/W. To realize this value, the metal heatsink (Lead 2/anode) must be soldered to a minimum 100 mm² copper area (2 oz. Cu preferred) acting as both thermal sink and low-inductance ground return. The DO-218AB footprint shown in the Vishay datasheet (Document 88382, page 4) must be followed precisely to ensure mechanical reliability and thermal performance.
Is the SM5S22HE3/2D RoHS-compliant and halogen-free?
Yes, the SM5S22HE3/2D is RoHS-compliant per Directive 2011/65/EU and satisfies Vishay's material categorization per document 99912. The molding compound is UL 94 V-0 rated, and the matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability standards. The HE3 suffix confirms compliance with JEDEC JESD201 Class 2 whisker resistance requirements.
How does the SM5S22HE3/2D compare to the SM5S22A variant?
The SM5S22HE3/2D has a VBR range of 24.4–29.8 V (±10 %), while the SM5S22A variant specifies 24.4–26.9 V (±5 %). Both share identical VWM (22.0 V), VC (39.4 V / 35.5 V), package (DO-218AB), and AEC-Q101 qualification. The SM5S22HE3/2D offers broader parametric tolerance and wider production availability; the SM5S22A is selected when tighter clamping consistency is critical for high-precision protection schemes.
SM5S22HE3/2D 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S22HE3/2D FAQ
1.How can I place an order for SM5S22HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S22HE3/2D 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 SM5S22HE3/2D reliable?
The price and inventory of SM5S22HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S22HE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S22HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S22HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S22HE3/2D?
SM5S22HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S22HE3/2D 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 SM5S22HE3/2D?
For technical support, including SM5S22HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S22HE3/2D requirements.
6.How does Aetrix verify that SM5S22HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S22HE3/2D 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 SM5S22HE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S22HE3/2D?
All SM5S22HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S22HE3/2D, 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 SM5S22HE3/2D part is unused and in its original packaging.
Return procedure for SM5S22HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S22HE3/2D Tags
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