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Vishay General Semiconductor - Diodes Division SMAJ22CA-M3/61
- Part No.:
- SMAJ22CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CA-M3/61.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
SMAJ22CA-M3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 22 V standoff 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 a 10/1000 μs waveform - deployed in DC power rails and signal lines of automotive sensor modules.
For engineers reviewing the SMAJ22CA-M3/61 datasheet, SMAJ22CA-M3/61 pinout, SMAJ22CA-M3/61 application, or SMAJ22CA-M3/61 equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.42), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at 22 V), then rapidly transitions to low-impedance conduction when transient voltage exceeds VBR. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and repeatable breakdown behavior across temperature (-55 °C to +150 °C).
The device uses a planar silicon avalanche structure optimized for fast response (<1.0 ps typical), low incremental surge resistance, and consistent clamping performance across repetitive transients. Its DO-214AC (SMA) package provides thermal resistance of 120 °C/W (junction-to-ambient) and supports automated SMT placement on standard PCB pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR min/max | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transients. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; supports common ISO 7637-2 and IEC 61000-4-5 surges. |
| ID @ VWM | <1 μA - Reverse leakage at rated standoff; negligible power loss and no signal distortion in standby. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with IPC-7351B standard land pattern. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative surge) | Conducts during negative-going transients; symmetric with cathode for bidirectional clamping. |
| Cathode | Transient current entry (positive surge) | Conducts during positive-going transients; identical electrical behavior to anode due to CA symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both polarities - eliminates need for polarity-aware layout in AC-coupled or floating lines. |
| 400 W peak pulse power | Rated per 10/1000 μs waveform - withstands automotive load-dump and inductive switching surges without degradation. |
| Halogen-free & RoHS-compliant (M3) | Meets JEDEC J-STD-609A Class 1 marking; supports environmental compliance for global OEM programs. |
| MSL Level 1 | No floor life limitation; can be stored indefinitely and reflowed at 260 °C peak without baking or special handling. |
| AEC-Q101 ready | Halogen-free HM3 variant available with full qualification - enables drop-in use in automotive ECUs and ADAS sensors. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) in engine control units against ISO 7637-2 Pulse 1/2a/5a. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at connector interface or IC pin. Use Value: Limits induced surge voltage to ≤35.5 V, preventing latch-up or gate oxide damage in 3.3 V/5 V sensor signal chains. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers exposed to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side terminals before optocoupler or Schmitt trigger input stage. Use Value: Absorbs up to 400 W surge energy while maintaining <1 μA leakage, ensuring stable logic thresholds and long-term reliability. |
| Consumer Power Adapter Output | Telecom Line Interface |
Use Scenario: Secondary-side surge suppression on 12–24 V DC outputs of wall adapters and USB-PD auxiliary supplies. IC Role / Device Role / Timing Role: Final-stage protector between DC-DC converter and downstream USB hub or display controller. Use Value: Clamps lightning-induced surges to 35.5 V within nanoseconds, preserving USB PD negotiation integrity and preventing port disablement. |
Use Scenario: Overvoltage protection on RS-485/RS-422 differential pairs in base station backhaul and network equipment. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, placed before transceiver ESD diodes. Use Value: Symmetric clamping maintains differential signal integrity during 1 kV/2 kV EFT bursts without skew or common-mode shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA-E3/61 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial/industrial use where halogen-free requirement is not mandated. | Select E3 for cost-sensitive non-automotive designs; verify material compliance with end-equipment standards. |
| SMAJ22CAHM3_A/H | Identical clamping and power ratings; fully AEC-Q101 qualified with extended temperature validation and enhanced process controls. | Required for automotive safety-critical modules (e.g., ABS, airbag controllers) needing certified reliability. | Choose HM3 for automotive production; note H-suffix denotes 7" tape-and-reel packaging and AEC-Q101 revision A qualification. |
Compared with SMAJ22CA-M3/61, the E3 variant offers identical protection performance at lower material cost but lacks halogen-free certification, while the HM3 variant adds AEC-Q101 qualification and tighter process controls - making it suitable for automotive deployment where regulatory compliance and long-term field reliability are mandatory.
Availability
SMAJ22CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter outputs requiring stable component supply, halogen-free compliance, and MSL Level 1 handling.
Supply support for SMAJ22CA-M3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of SMAJ22CA-M3/61 at its rated peak pulse current?
The SMAJ22CA-M3/61 has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value ensures downstream circuitry remains below destructive voltage thresholds during standardized surge events, and is confirmed in Vishay's datasheet Document Number 88390, page 2.
Is SMAJ22CA-M3/61 suitable for automotive applications?
SMAJ22CA-M3/61 is halogen-free and RoHS-compliant, with MSL Level 1 and -55 °C to +150 °C operating range - meeting baseline environmental requirements for automotive use. While the M3 suffix itself is not AEC-Q101 qualified, the HM3 variant (e.g., SMAJ22CAHM3_A/H) is fully qualified and shares identical electrical specs, enabling direct upgrade for automotive production.
How does the bidirectional design of SMAJ22CA-M3/61 affect its circuit implementation?
As a bidirectional TVS, SMAJ22CA-M3/61 provides symmetrical clamping for both positive and negative transients without polarity marking - simplifying layout on AC-coupled lines, differential buses (e.g., RS-485), or floating sensor grounds. No orientation check is needed during placement, reducing assembly errors and eliminating the risk of reverse installation seen with unidirectional variants.
What is the thermal resistance of SMAJ22CA-M3/61, and how does it impact power dissipation?
SMAJ22CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads. At its rated 3.3 W steady-state power dissipation (PD), this yields ~400 °C rise above ambient - confirming that PD is only relevant for continuous DC stress, not transient suppression. The 400 W PPPM rating applies to short-duration pulses where thermal mass dominates.
Does SMAJ22CA-M3/61 require special PCB layout considerations compared to other SMA-packaged TVS diodes?
No special layout is required beyond IPC-7351B compliant SMA (DO-214AC) footprints. Key recommendations include using minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power, avoiding thermal reliefs on pads, and routing protected traces directly to the SMAJ22CA-M3/61 terminals with minimal stub length to preserve high-frequency surge response.
SMAJ22CA-M3/61 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ22CA-M3/61 FAQ
1.How can I place an order for SMAJ22CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CA-M3/61 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 SMAJ22CA-M3/61 reliable?
The price and inventory of SMAJ22CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CA-M3/61?
SMAJ22CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CA-M3/61 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 SMAJ22CA-M3/61?
For technical support, including SMAJ22CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ22CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22CA-M3/61 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 SMAJ22CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22CA-M3/61?
All SMAJ22CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CA-M3/61, 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 SMAJ22CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ22CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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