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Vishay General Semiconductor - Diodes Division SMBJ22A-M3/52
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- Part No.:
- SMBJ22A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22A-M3/52.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,152
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Product details
Overview
SMBJ22A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 16.9 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and automotive ECUs.
For engineers reviewing the SMBJ22A-M3/52 datasheet, SMBJ22A-M3/52 pinout, SMBJ22A-M3/52 application, or SMBJ22A-M3/52 equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, 150 °C max junction temperature, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>1 GΩ), but triggers into low-impedance conduction when transient voltage exceeds VBR, clamping the line to ≤35.5 V. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
Designed for single-polarity DC rails, SMBJ22A-M3/52 delivers 600 W peak pulse power handling with 0.01 % duty cycle, derated linearly above 25 °C ambient per Fig. 2, and meets J-STD-020 MSL Level 1 (260 °C peak reflow). It is not rated for bidirectional use - bidirectional variants require CA suffix (e.g., SMBJ22CA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 22 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit's nominal rail |
| VBR (Breakdown Voltage) | 24.4–26.9 V at IT = 1 mA - guaranteed conduction onset range; ensures reliable triggering above system overvoltage threshold |
| VC (Clamping Voltage) | 35.5 V at IPPM = 16.9 A - maximum voltage seen by downstream IC during 10/1000 µs surge; defines protection margin for 3.3 V/5 V logic |
| IPPM (Peak Pulse Current) | 16.9 A - maximum non-repetitive surge current supported with 10/1000 µs waveform; determines survivability against IEC 61000-4-5 Level 4 surges |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity under standardized surge; enables robust protection of 12 V/24 V automotive and industrial buses |
| ID (Reverse Leakage) | ≤1.0 µA at VWM = 22 V - negligible standby power loss; avoids loading sensitive analog or battery-backed circuits |
| TJ max. | 150 °C - maximum junction temperature; supports operation in under-hood or enclosed industrial enclosures without forced cooling |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1 (260 °C peak reflow). Cathode indicated by band on case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected line ground or low-side reference; completes clamping loop during transient |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 4 kV surge (line-to-ground) on 12 V systems without parallel staging |
| 35.5 V clamping at 16.9 A | Provides ≥5 V margin below typical 40 V absolute maximum rating of automotive microcontrollers and CAN transceivers |
| Low 1.0 µA reverse leakage at 22 V | Minimizes quiescent current draw in always-on vehicle modules (e.g., body control units, telematics) |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without prebaking or special handling |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply rail and LIN bus lines from load dump and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between rail and chassis ground, triggered within <1 ns to clamp spikes up to 100 V. Use Value: Prevents latch-up or permanent damage to LIN transceivers (e.g., TJA1020) and MCU I/O pins during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on optocoupler input side, absorbing repetitive 1 kV/500 A transients from solenoid coil de-energization. Use Value: Eliminates need for external RC snubbers while maintaining <10 µs response time and supporting >100,000 surge cycles per channel. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Rail-to-ground TVS on 24 V motor driver supply, activated only during transient overvoltage, remaining high-impedance during normal PWM operation. Use Value: Reduces EMI emissions by limiting dv/dt on power traces and extends lifespan of MOSFET half-bridge drivers (e.g., STSPIN250). |
Use Scenario: Secondary-side transient suppression on +48 V telecom rectifier output feeding PoE PSE controllers. IC Role / Device Role / Timing Role: Final-stage clamping device after bulk filtering, ensuring downstream DC-DC converters (e.g., LM5017) see no voltage exceeding 55 V. Use Value: Meets GR-1089-CORE Level 3 lightning surge immunity requirements without increasing board area or BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Acceptable where halogen-free mandate does not apply (e.g., non-automotive commercial gear) | Select E3 for cost-sensitive industrial designs without automotive or green procurement requirements |
| SAC22 | Lower 400 W PPPM, 38.9 V VC at 15.4 A, SOD-123FL package (smaller footprint, lower thermal mass) | Better suited for space-constrained consumer electronics; insufficient for 12 V automotive load dump | Choose SAC22 only for low-energy signal-line protection (e.g., USB VBUS) where 600 W capability is unnecessary |
Compared with SMBJ22A-E3/52, the M3 variant adds halogen-free compliance for automotive Tier 1 supply chains; compared with SAC22, SMBJ22A-M3/52 provides 50 % higher surge energy handling and superior thermal dissipation via SMB package - critical for sustained industrial surge environments.
Availability
SMBJ22A-M3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and telecom power front-end designs requiring stable component supply, halogen-free compliance, and proven surge resilience.
Supply support for SMBJ22A-M3/52 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the maximum clamping voltage of SMBJ22A-M3/52 under a 10/1000 µs surge?
The SMBJ22A-M3/52 has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 16.9 A with a 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ22A-M3/52 maintains this clamping performance across its specified operating temperature range.
Is SMBJ22A-M3/52 suitable for bidirectional signal line protection?
No, SMBJ22A-M3/52 is a unidirectional TVS diode - its cathode band indicates polarity, and it conducts only when anode-to-cathode voltage exceeds VBR. For bidirectional protection (e.g., RS-485, USB D+/D−), the SMBJ22CA variant must be used. Using SMBJ22A-M3/52 on AC or dual-polarity lines risks open-circuit failure during negative transients.
Does SMBJ22A-M3/52 meet AEC-Q101 qualification?
No, SMBJ22A-M3/52 is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free RoHS compliance for commercial-grade use. For automotive-qualified equivalents, select SMBJ22AHM3_X (e.g., SMBJ22AHM3_B/H), where "_X" denotes revision code and HM3 confirms AEC-Q101 qualification per Vishay ordering nomenclature in document 88392.
What is the thermal resistance from junction to ambient for SMBJ22A-M3/52?
The typical junction-to-ambient thermal resistance (RθJA) of SMBJ22A-M3/52 is 100 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value assumes natural convection and is critical for calculating worst-case junction temperature rise under continuous power dissipation - though SMBJ22A-M3/52 is intended for transient, not steady-state, operation.
Can SMBJ22A-M3/52 replace SMBJ24A in a 24 V system?
No - SMBJ22A-M3/52 has a 22 V stand-off voltage (VWM) and 24.4–26.9 V breakdown range, making it unsuitable for direct replacement in a nominal 24 V system where VWM must exceed operating voltage by ≥10 %. SMBJ24A (VWM = 24 V) is the correct choice; substituting SMBJ22A-M3/52 risks premature conduction and increased leakage during normal 24 V operation.
SMBJ22A-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 16.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ22A-M3/52 FAQ
1.How can I place an order for SMBJ22A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22A-M3/52 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 SMBJ22A-M3/52 reliable?
The price and inventory of SMBJ22A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ22A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22A-M3/52?
SMBJ22A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22A-M3/52 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 SMBJ22A-M3/52?
For technical support, including SMBJ22A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22A-M3/52 requirements.
6.How does Aetrix verify that SMBJ22A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ22A-M3/52 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 SMBJ22A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ22A-M3/52?
All SMBJ22A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22A-M3/52, 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 SMBJ22A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ22A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ22A-M3/52 Tags
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