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Vishay General Semiconductor - Diodes Division SM5S22A-E3/2D
- Part No.:
- SM5S22A-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S22A-E3/2D.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,786
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Product details
Overview
SM5S22A-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection in 24 V systems. It features a 22.0 V stand-off voltage (VWM), 24.4–26.9 V breakdown range (VBR), 35.5 V clamping voltage at 101 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S22A-E3/2D datasheet, SM5S22A-E3/2D pinout, SM5S22A-E3/2D application, or SM5S22A-E3/2D equivalent, this device serves as a high-reliability, high-surge-capability TVS for automotive power rail protection where thermal stability up to TJ = 175 °C and low leakage (<10 μA at VWM) are critical selection criteria.
Technical Context
The SM5S22A-E3/2D employs passivated anisotropic rectifier technology optimized for junction stability under repeated surge stress. Its DO-218AB package provides direct metal heatsink mounting with RθJC = 1.0 °C/W, enabling efficient thermal transfer during 10 ms exponential load dump events per ISO 7637-2.
As a unidirectional TVS, it operates as a forward-biased clamp during positive transients only - polarity is fixed with the metal heatsink serving as the anode terminal. It is not rated for bidirectional suppression and requires correct orientation in series with the protected line.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 22.0 V - Maximum continuous reverse operating voltage before significant leakage; defines system nominal rail compatibility (e.g., 24 V automotive). |
| VBR (Breakdown Voltage) | 24.4–26.9 V at IT = 5 mA - Voltage at which device enters avalanche conduction; ensures reliable triggering above normal operating transients. |
| VC (Clamping Voltage) | 35.5 V at IPPM = 101 A (10/1000 μs) - Peak voltage seen by downstream circuitry during worst-case surge; determines required IC overvoltage margin. |
| PPPM (Peak Pulse Power) | 3600 W (10/1000 μs) - Surge energy handling capacity; supports robust protection against ISO 7637-2 Pulse 5a load dump events. |
| TJ max | 175 °C - Maximum junction temperature rating; enables placement near hot engine compartments without derating concerns. |
| Leakage ID | <10 μA at VWM, TA = 25 °C - Minimal standby current draw; avoids battery drain in always-on vehicle modules. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended, metal heatsink case with matte tin-plated leads. Heatsink (Lead 2) is the anode; Lead 1 is the cathode. Molding compound meets UL 94 V-0; MSL Level 1 (245 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Cathode) | Transient current sink during clamping | Connected to protected line (e.g., battery feed); carries full surge current to ground/anode return path. |
| Lead 2 / Metal Heatsink (Anode) | Main thermal and electrical return path | Must be soldered to large copper pour or heatsink; serves as both anode terminal and primary thermal interface (RθJC = 1.0 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable avalanche performance over 1000+ surge cycles without parameter drift or degradation. |
| TJ = 175 °C operation | Supports direct mounting on engine control units (ECUs) or body control modules (BCMs) without external thermal derating. |
| Low forward voltage drop | VF ≤ 2.0 V at IF = 100 A (8.3 ms half-sine) - minimizes conduction loss during sustained overvoltage conditions. |
| Meets ISO 7637-2 Pulse 5a | Validated for 10 ms exponential load dump waveforms up to 32 V + 20 %, ensuring compliance in 24 V vehicle architectures. |
| MSL Level 1 rating | Allows standard SMT reflow without moisture sensitivity concerns; no baking required prior to assembly. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of 24 V supply input against alternator load dump surges during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC converter input. Use Value: Limits transient voltage to ≤35.5 V, preventing damage to downstream 40 V-rated buck controllers and microcontrollers. |
Use Scenario: Guarding LIN bus power supply and microcontroller I/O rails from coupled transients in door module wiring harnesses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12/24 V auxiliary rail feeding CAN/LIN transceivers and sensor interfaces. Use Value: Maintains <10 μA leakage at 22 V, avoiding false wake-up in low-power sleep modes while surviving 3600 W surges. |
| Commercial Vehicle Telematics Unit | Start-Stop System Battery Management |
Use Scenario: Securing GPS/GSM modem power input exposed to long cable runs and relay switching noise in truck cab installations. IC Role / Device Role / Timing Role: Front-end TVS on main 24 V input before EMI filter and protection FET. Use Value: Clamps 101 A pulses within 100 ns, preserving signal integrity of time-critical GNSS timing signals downstream. |
Use Scenario: Protecting bidirectional DC/DC converter control logic during aggressive regenerative braking-induced voltage spikes. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 24 V control rail shared between starter motor driver and battery monitor IC. Use Value: Operates reliably at TJ = 175 °C ambient, eliminating thermal shutdown risk during extended stop-start cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ22A | Same VWM (22 V), but lower PPPM (400 W vs. 3600 W); DO-214AC package; RθJC = 45 °C/W. | Not suitable for load dump; limited to ESD and low-energy transients in non-automotive consumer gear. | Select only for cost-sensitive, non-automotive 22 V rail protection where surge energy is <500 W. |
| ON Semiconductor SMA6J22A | VWM = 22 V, PPPM = 600 W (10/1000 μs), DO-214AC, TJ max = 150 °C, not AEC-Q101 qualified. | Lacks automotive qualification and thermal capability; unsuitable for under-hood deployment or ISO 7637-2 compliance. | Acceptable for industrial control panels with moderate surge exposure and ambient <125 °C. |
Compared with SMAJ22A and SMA6J22A, the SM5S22A-E3/2D delivers 6× higher surge power handling, 25 °C higher junction rating, and certified AEC-Q101 reliability - making it the sole choice for production automotive load dump protection where thermal margin and regulatory compliance are mandatory.
Availability
SM5S22A-E3/2D is available at Aetrix Electronics and suitable for automotive ECU protection, commercial vehicle telematics, and start-stop battery management systems requiring stable component supply across multi-year production cycles.
Supply support for SM5S22A-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, and passive components for automotive, industrial, and computing markets.
The SM5SxxA family was engineered specifically for automotive load dump protection, combining high-temperature silicon design, DO-218AB thermal efficiency, and AEC-Q101 validation to replace older axial-leaded TVS solutions in space-constrained ECUs.
FAQ
What is the polarity configuration of the SM5S22A-E3/2D?
The SM5S22A-E3/2D is a unidirectional TVS diode with fixed polarity: the metal heatsink (Lead 2) is the anode, and Lead 1 is the cathode. This configuration allows it to clamp only positive-going transients on the cathode-connected line. Reverse connection will block normal operation and prevent clamping during load dump events.
Does the SM5S22A-E3/2D meet ISO 7637-2 requirements?
Yes, the SM5S22A-E3/2D is validated to meet ISO 7637-2 Pulse 5a (load dump) requirements under specified test conditions, including 10 ms exponential waveform testing. Its 3600 W peak pulse power rating and 35.5 V clamping voltage ensure compliance when properly mounted on adequate copper area per Vishay's recommended pad layout.
What is the maximum continuous power dissipation for the SM5S22A-E3/2D?
The SM5S22A-E3/2D has a DC power dissipation rating (PD) of 5.0 W when mounted on an infinite heatsink at TC = 25 °C. In real-world PCB layouts, derating applies per the power derating curve in Figure 1 of the datasheet - e.g., ~3.5 W at TC = 100 °C - due to finite thermal resistance from junction to board.
Is the SM5S22A-E3/2D RoHS and halogen-free compliant?
Yes, the SM5S22A-E3/2D carries the HE3 suffix, indicating full compliance with RoHS Directive 2011/65/EU and JEDEC JS709A halogen-free standards. The molding compound meets UL 94 V-0, and terminals are matte tin plated per J-STD-002 and JESD 22-B102.
How does the DO-218AB package improve thermal performance versus DO-214AC?
The DO-218AB package of the SM5S22A-E3/2D uses a metal heatsink as the anode terminal, achieving RθJC = 1.0 °C/W - over 40× better than DO-214AC's typical RθJC ≈ 45 °C/W. This enables direct thermal coupling to PCB copper or external heatsinks, critical for sustaining repeated 3600 W surges without junction overheating.
SM5S22A-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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 101A
- 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
SM5S22A-E3/2D FAQ
1.How can I place an order for SM5S22A-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S22A-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 SM5S22A-E3/2D reliable?
The price and inventory of SM5S22A-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 SM5S22A-E3/2D is usually 5 days.
3.What payment methods are accepted for SM5S22A-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S22A-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S22A-E3/2D?
SM5S22A-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S22A-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 SM5S22A-E3/2D?
For technical support, including SM5S22A-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S22A-E3/2D requirements.
6.How does Aetrix verify that SM5S22A-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S22A-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 SM5S22A-E3/2D meets industry standards.
7.What is the process for return or replacement of SM5S22A-E3/2D?
All SM5S22A-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S22A-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 SM5S22A-E3/2D part is unused and in its original packaging.
Return procedure for SM5S22A-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S22A-E3/2D Tags
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