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Vishay General Semiconductor - Diodes Division SMAJ22A-M3/5A
- Part No.:
- SMAJ22A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22A-M3/5A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ22A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 11.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ22A-M3/5A datasheet, SMAJ22A-M3/5A pinout, SMAJ22A-M3/5A application, or SMAJ22A-M3/5A equivalent, key selection criteria include clamping performance under 11.3 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 22 V, it avalanches into low-impedance conduction to divert transient energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (< 1 ns), while the SMA package supports high surge current handling without thermal runaway under repetitive 0.01% duty cycle conditions.
The device is rated for TJ = –55 °C to +150 °C operation, with 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient. Its 300 W derated peak pulse power above 78 V does not apply here; SMAJ22A-M3/5A maintains full 400 W rating per JEDEC JESD22-A114 standard test waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin for protected line. |
| VBR @ IT = 1 mA | 24.4–26.9 V - Verified avalanche onset range; ensures predictable turn-on with ≤10.4% tolerance for design margining. |
| VC @ IPPM = 11.3 A | 35.5 V - Clamped voltage during 10/1000 μs surge; limits stress on downstream 3.3 V or 5 V logic components. |
| PPPM | 400 W - Peak pulse power capability; sustains single transient events up to 400 W without failure per Fig. 1 curve. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental forward overvoltage. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on minimum pad layout; informs PCB copper area requirements for thermal management. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with IPC-7351B standard land pattern. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), halogen-free and RoHS-compliant (M3 suffix). Polarity indicated by cathode band on one end; anode and cathode terminals are axially oriented along the body length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR; requires low-inductance ground path. |
| Anode (unmarked end) | Reference/return node | Typically tied to system ground or low-impedance return plane; completes shunt path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection of 24 V industrial bus lines against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (< 1 ns response), critical for safeguarding high-speed interface ICs. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under temperature cycling and humidity exposure per JESD22-A101. |
| MSL Level 1 moisture sensitivity | Permits unlimited floor life and standard reflow profile use without baking, reducing manufacturing overhead. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications; SMAJ22A-M3/5A itself is commercial-grade but shares identical die and construction. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power rails from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and GND, triggered within nanoseconds upon overvoltage detection. Use Value: Limits clamped voltage to 35.5 V, ensuring downstream 3.3 V MCU I/O remains below absolute maximum rating during 100 V/50 ms load dump events. |
Use Scenario: Shields 24 V digital input circuitry in programmable logic controllers from inductive kickback generated by solenoid valve switching. IC Role / Device Role / Timing Role: Unidirectional TVS connected across input terminal and common rail to clamp negative-going transients to safe levels. Use Value: Withstands 11.3 A peak surge current while maintaining VC ≤ 35.5 V, preventing latch-up or damage to optocoupler input stages. |
| Consumer Appliance Motor Drive | Telecom Power Supply Input |
|
Use Scenario: Guards BLDC motor driver gate drivers and current sense amplifiers against ESD and commutation spikes in smart HVAC systems. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor phase traces to minimize inductance in clamping path. Use Value: Fast response time and low Rsurge reduce VC overshoot during <100 ns edge transients, preserving gate oxide integrity of 600 V MOSFETs. |
Use Scenario: Installed at AC-DC converter primary-side input to absorb line surges per IEC 61000-4-5 prior to rectification and filtering. IC Role / Device Role / Timing Role: Front-end overvoltage clamp protecting bridge rectifier and bulk capacitor from destructive overvoltage. Use Value: 400 W pulse rating accommodates 2 kV/12 Ω combination wave surges without degradation, supporting EN 61000-4-5 compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A | Same electrical specs and package; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial industrial equipment where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical thermal and surge performance. |
| SMAJ22CA-M3/5A | Bidirectional variant: symmetric VBR = 24.4–26.9 V, no polarity marking, same VC = 35.5 V at ±11.3 A. | Required for AC-coupled or floating signal lines (e.g., RS-485, Ethernet PHY) where bidirectional transients occur. | Choose only if protection must handle both polarities; otherwise unidirectional SMAJ22A-M3/5A offers lower leakage and simpler layout. |
Compared with SMAJ22A-E3/5A, SMAJ22A-M3/5A adds halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ22CA-M3/5A, it provides optimized unidirectional clamping with cathode identification for DC rail protection, reducing risk of misplacement during assembly.
Availability
SMAJ22A-M3/5A is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, and telecom power supply front-ends requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMAJ22A-M3/5A 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, power efficiency, and AEC-Q qualification.
The SMAJ series targets board-level transient protection in harsh environments; SMAJ22A-M3/5A specifically addresses cost-sensitive, high-volume 22 V rail protection needs in automotive and industrial markets with standardized SMT compatibility.
FAQ
What is the maximum clamping voltage of SMAJ22A-M3/5A under surge conditions?
The SMAJ22A-M3/5A exhibits a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 11.3 A using the standard 10/1000 μs waveform. This value is measured per JEDEC JESD22-A114 and guarantees that downstream components connected to the protected line will not experience voltage stress exceeding 35.5 V during transient events, making SMAJ22A-M3/5A suitable for safeguarding 24 V systems with 3.3 V or 5 V logic interfaces.
Does SMAJ22A-M3/5A meet automotive qualification standards?
SMAJ22A-M3/5A is a commercial-grade part with halogen-free RoHS compliance (M3 suffix), but it is not AEC-Q101 qualified. However, Vishay offers the functionally identical SMAJ22A-HM3/5A variant - which shares the same die, package, and electrical specifications - explicitly qualified to AEC-Q101 for automotive applications. Engineers requiring automotive qualification should specify the HM3 suffix; SMAJ22A-M3/5A remains appropriate for industrial and consumer designs where AEC-Q101 is not mandated.
How does the SMAJ22A-M3/5A differ from bidirectional TVS diodes like SMAJ22CA-M3/5A?
SMAJ22A-M3/5A is unidirectional with a clearly marked cathode band, intended for DC rail protection where transients occur only in reverse polarity relative to the supply. In contrast, SMAJ22CA-M3/5A is bidirectional, lacking polarity marking and providing symmetrical clamping for AC or floating lines. Both share identical VBR, VC, and PPPM, but SMAJ22A-M3/5A offers lower reverse leakage at VWM and eliminates ambiguity in orientation during placement - critical for high-reliability DC power rail protection using SMAJ22A-M3/5A.
What PCB layout considerations are required for optimal performance of SMAJ22A-M3/5A?
For optimal clamping performance, SMAJ22A-M3/5A must be placed as close as possible to the protected node with minimal trace length - especially on the cathode side - to reduce parasitic inductance that could cause VC overshoot. The datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power; narrower traces or smaller pads will thermally derate the device. Thermal relief patterns should be avoided on the anode/cathode pads to maintain low RθJA = 120 °C/W.
Is SMAJ22A-M3/5A compatible with lead-free reflow soldering processes?
Yes, SMAJ22A-M3/5A is fully compatible with lead-free reflow soldering. It meets MSL Level 1 per J-STD-020, allowing unlimited floor life and exposure to peak temperatures up to 260 °C during reflow. The matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and the molding compound satisfies UL 94 V-0 flammability rating. No pre-baking is required, simplifying integration into standard SMT assembly lines using SMAJ22A-M3/5A.
SMAJ22A-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 11.3A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ22A-M3/5A FAQ
1.How can I place an order for SMAJ22A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22A-M3/5A 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 SMAJ22A-M3/5A reliable?
The price and inventory of SMAJ22A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22A-M3/5A?
SMAJ22A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22A-M3/5A 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 SMAJ22A-M3/5A?
For technical support, including SMAJ22A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22A-M3/5A requirements.
6.How does Aetrix verify that SMAJ22A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22A-M3/5A 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 SMAJ22A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22A-M3/5A?
All SMAJ22A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22A-M3/5A, 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 SMAJ22A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ22A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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