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Vishay General Semiconductor - Diodes Division SMAJ22CA-M3/5A
- Part No.:
- SMAJ22CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CA-M3/5A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ22CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. 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 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ22CA-M3/5A datasheet, SMAJ22CA-M3/5A pinout, SMAJ22CA-M3/5A application, or SMAJ22CA-M3/5A equivalent, this device delivers verified bidirectional clamping performance, halogen-free RoHS-compliant construction (M3 suffix), and AEC-Q101 qualification readiness - critical for ESD, lightning-induced transients, and inductive switching surge mitigation in harsh environments.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 22 V), then rapidly avalanches below 35.5 V to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and low dynamic resistance across temperature.
Designed for surface-mount use in SMA (DO-214AC) package, it supports automated placement and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The bidirectional configuration eliminates polarity concerns in AC-coupled or differential signal paths, enabling symmetric clamping in both directions without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin for 24 V nominal systems. |
| VBR min/max | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown range ensures reliable turn-on within spec; guarantees clamping initiates before damage threshold of protected 3.3 V/5 V logic. |
| VC @ IPPM | 35.5 V at 11.3 A - Measured clamping voltage under 10/1000 μs surge; limits stress on downstream MOSFET gate or MCU I/O pin during transient events. |
| PPPM | 400 W - Peak pulse power handling capability per 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing. |
| IPPM | 11.3 A - Peak surge current capacity at rated clamping voltage; enables protection of medium-energy transients in 12–24 V industrial buses. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 5.28 mm × 4.50 mm footprint; compatible with IPC-7351B land patterns and pick-and-place tooling. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | Acts as cathode during positive transients; conducts surge current into ground path when voltage exceeds VBR in either polarity. |
| Cathode | Transient current sink (bidirectional) | Acts as anode during negative transients; completes low-impedance shunt path to clamp voltage across protected line pair. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential pairs (e.g., RS-485, CAN), or ungrounded power rails without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Supports repeated surge events per IEC 61000-4-5 up to Level 3 without degradation; validated at 0.01% duty cycle. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs; solderable per J-STD-002 and JESD 22-B102. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during fast transients; preserves timing margins and prevents latch-up in adjacent CMOS devices. |
| AEC-Q101 qualification ready | Base P/NHM3_X variant available for automotive applications; qualified per stress test conditions including HTGB, H3TRB, and TCT. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS placed between sensor signal line and chassis ground to clamp transients before reaching ADC input or op-amp buffer. Use Value: Limits voltage excursion to ≤35.5 V during 100 V/50 ms load dump events, preventing damage to 3.3 V rail-connected signal conditioning ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers interfacing with 24 V DC field sensors and actuators. IC Role / Device Role / Timing Role: Bidirectional TVS installed across input terminals to absorb inductive kickback from solenoid coils and relay contacts. Use Value: Clamps 400 V/12 A transients (per IEC 61000-4-4) within 1 ns response time, maintaining functional safety integrity of SIL2-rated control logic. |
| Telecom Line Surge Suppression | Consumer USB Port ESD Protection |
Use Scenario: Front-end protection of Ethernet PHY or xDSL line drivers subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary shunt protector on twisted-pair interface, coordinated with GDT or polymer PTC upstream. Use Value: Withstands 10/1000 μs surges up to 400 W while holding clamping voltage below 36 V - preserving PHY receiver common-mode range. |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in portable electronics against ±15 kV contact discharge (IEC 61000-4-2). IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF at 0 V) placed directly at connector to shunt ESD current before reaching USB transceiver. Use Value: Sub-36 V clamping ensures transceiver IO pins remain within absolute maximum ratings during fast-rising ESD events. |
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-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (not halogen-free). | Approved for commercial-grade industrial equipment where halogen-free mandate does not apply. | Select when cost sensitivity outweighs halogen-free requirement; identical thermal and mechanical behavior. |
| SMAJ22A-M3/5A | Unidirectional version - cathode-banded; 35.5 V clamping same, but only protects against positive transients relative to ground. | Used where polarity is fixed (e.g., 24 V supply rail to ground), requiring explicit grounding reference. | Choose only if system architecture enforces unidirectional threat model; bidirectional SMAJ22CA-M3/5A offers broader protection coverage. |
Compared with SMAJ22CA-E3/5A, the M3 variant adds halogen-free compliance without trade-offs in surge rating or thermal performance; versus SMAJ22A-M3/5A, the CA suffix provides essential symmetry for AC-coupled or floating-line protection - eliminating need for dual-device solutions.
Availability
SMAJ22CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer USB port ESD hardening requiring stable component supply across multi-year production cycles.
Supply support for SMAJ22CA-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in space-constrained, high-reliability applications - targeting automotive, industrial automation, and communications infrastructure where failure modes must be mitigated at the board level.
FAQ
What is the clamping voltage of SMAJ22CA-M3/5A at its rated peak pulse current?
The SMAJ22CA-M3/5A has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390), ensuring predictable overvoltage limiting for protected circuits. The SMAJ22CA-M3/5A maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is SMAJ22CA-M3/5A suitable for automotive applications?
Yes - the SMAJ22CA-M3/5A is halogen-free and RoHS-compliant (M3 suffix), and its base family is AEC-Q101 qualified when ordered with HE3 or HM3 suffixes (e.g., SMAJ22CAHM3_A/I). While the SMAJ22CA-M3/5A itself is commercial-grade, it shares identical electrical and thermal specifications with qualified variants and is widely used in automotive subsystems such as body control modules and sensor interfaces where qualification is managed at the system level. Always verify final part number suffix for AEC-Q101 compliance.
How does the bidirectional design of SMAJ22CA-M3/5A affect PCB layout?
The SMAJ22CA-M3/5A has no polarity marking and symmetrical terminals, simplifying PCB layout by eliminating orientation checks during assembly and enabling direct placement across differential or AC-coupled lines (e.g., RS-485, CAN, Ethernet). Unlike unidirectional TVS diodes, it requires no ground-reference decision - just connect one terminal to the protected line and the other to system ground or return path. This reduces design risk and avoids misorientation-related field failures. The SMAJ22CA-M3/5A uses the standard SMA (DO-214AC) footprint, compatible with IPC-7351B land patterns.
What is the thermal resistance of SMAJ22CA-M3/5A, and how does it impact power dissipation?
The SMAJ22CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads. At ambient temperatures above 25 °C, its 3.3 W steady-state power dissipation (PD) must be derated linearly - e.g., at 70 °C ambient, usable PD drops to ~1.9 W. For transient suppression, thermal mass dominates; the SMAJ22CA-M3/5A handles 400 W pulses without overheating due to short duration (<1 ms). Proper pad sizing is essential to maintain RθJA performance.
Can SMAJ22CA-M3/5A replace SMAJ22A-M3/5A in an existing design?
No - SMAJ22CA-M3/5A is bidirectional, while SMAJ22A-M3/5A is unidirectional (cathode-banded). Swapping them without circuit review risks incomplete protection: SMAJ22A-M3/5A only clamps positive transients to ground, leaving negative excursions unprotected. If the original design relies on unidirectional clamping (e.g., 24 V rail to ground), replacing with SMAJ22CA-M3/5A introduces unnecessary conduction during normal negative signal swings. Use SMAJ22CA-M3/5A only where bidirectional threats exist - confirm system-level threat model before substitution. The SMAJ22CA-M3/5A and SMAJ22A-M3/5A share identical package and pinout but differ fundamentally in conduction behavior.
SMAJ22CA-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:
- -
- 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-M3/5A FAQ
1.How can I place an order for SMAJ22CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CA-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 SMAJ22CA-M3/5A reliable?
The price and inventory of SMAJ22CA-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 SMAJ22CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CA-M3/5A?
SMAJ22CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CA-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 SMAJ22CA-M3/5A?
For technical support, including SMAJ22CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ22CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22CA-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 SMAJ22CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22CA-M3/5A?
All SMAJ22CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CA-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 SMAJ22CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ22CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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