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Vishay General Semiconductor - Diodes Division SMAJ22C-E3/61
- Part No.:
- SMAJ22C-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22C-E3/61.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,505
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Product details
Overview
SMAJ22C-E3/61 from Vishay General Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features 22 V stand-off voltage (VWM), 39.4 V maximum clamping voltage (VC) at 10.2 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), making it suitable for protecting MOSFETs, ICs, and sensor interfaces against ESD and inductive switching surges.
For engineers reviewing the SMAJ22C-E3/61 datasheet, SMAJ22C-E3/61 pinout, SMAJ22C-E3/61 application, or SMAJ22C-E3/61 equivalent, this device is evaluated for robust transient suppression in automotive sensor modules, industrial I/O protection, and telecom line interface circuits where bi-directional surge immunity and low leakage (<1 µA at 22 V) are required.
Technical Context
The SMAJ22C-E3/61 employs a glass-passivated silicon avalanche junction optimized for fast response (<1 ns) to transient overvoltages and low incremental surge resistance. Its bi-directional configuration enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
Rated for -55 °C to +150 °C operating junction temperature and compliant with J-STD-020 MSL Level 1, it supports lead-free reflow up to 260 °C and meets RoHS 2002/95/EC. The device delivers 400 W peak pulse power below 78 V and maintains stable clamping performance under repetitive 0.01% duty cycle surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VC @ IPPM | 39.4 V - Clamped voltage at 10.2 A surge; ensures downstream ICs rated for ≤40 V absolute maximum survive transient events. |
| IPPM | 10.2 A - Peak pulse current capability with 10/1000 µs waveform; sufficient for IEC 61000-4-5 Level 3 (1 A–2 A line surge) with design margin. |
| PPPM | 400 W - Peak pulse power rating; enables handling of high-energy transients without thermal runaway when mounted per recommended 5.0 × 5.0 mm copper pads. |
| ID @ VWM | <1 µA - Reverse leakage at 22 V; minimizes standby power loss and avoids false triggering in high-impedance sensor bias networks. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Bi-directional surge path | Either terminal serves as input/output; no cathode band - enables placement flexibility on differential or AC-coupled lines. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, RS-485 buses, or transformer-coupled interfaces without polarity concerns. |
| 400 W peak pulse power (10/1000 µs) | Provides headroom for multiple transient events in industrial control inputs exposed to relay coil kickback or motor drive noise. |
| Low clamping ratio (VC/VWM = 1.79) | Ensures tight voltage limiting - critical for safeguarding 3.3 V or 5 V logic interfaces powered from 24 V rails via LDOs or DC-DC converters. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to SMT assembly; compatible with standard reflow profiles including lead-free (260 °C peak). |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and 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: Bi-directional TVS placed across signal pair or between signal and chassis ground to clamp ±200 V transients within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in 5 V or 3.3 V transceiver ICs while maintaining signal integrity due to sub-1 pF junction capacitance at 0 V. |
Use Scenario: Shielding PLC digital input channels from 24 V DC field wiring surges caused by contactor switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS installed at connector entry point to shunt >1 kV transients before reaching optocoupler or microcontroller GPIO. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without additional filtering components or PCB real estate. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding Ethernet PHY magnetics or DSL line drivers against induced surges from nearby AC mains or antenna coupling. IC Role / Device Role / Timing Role: Bi-directional clamping element across differential pairs (e.g., TX+/TX−) to limit common-mode overvoltage during lightning events. Use Value: Maintains signal fidelity with <1 pF capacitance at 0 V and avoids data corruption or PHY reset due to overvoltage-induced latch-up. |
Use Scenario: Protecting MCU GPIOs and gate drivers controlling brushed DC motors in washing machines or HVAC blowers subject to commutation spikes. IC Role / Device Role / Timing Role: TVS placed across motor terminals or between driver output and ground to absorb inductive kickback energy exceeding 100 V. Use Value: Extends lifespan of low-side N-channel MOSFETs and prevents MCU brown-out from supply rail collapse during motor turn-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA-E3/61 | Identical electrical specs and packaging; CA suffix denotes same bi-directional construction as C variant per Vishay documentation. | No functional difference - both rated for identical VWM, VC, and PPPM; CA is alternate marking per ordering matrix. | Select SMAJ22C-E3/61 for standard commercial-grade availability; SMAJ22CA-E3/61 may reflect regional distribution labeling but performs identically. |
| SMBJ22C-E3/61 | Same VWM and VC, but SMB package (DO-214AA) offers higher PPPM (600 W) and lower RθJA (90 °C/W vs. 120 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint (4.6 × 3.95 mm vs. 4.57 × 2.79 mm) and different pad layout. | Choose SMBJ22C-E3/61 only if system-level testing confirms need for >400 W surge handling or elevated ambient temperatures exceed 105 °C. |
Compared with SMAJ22C-E3/61, SMAJ22CA-E3/61 is functionally identical and interchangeable, whereas SMBJ22C-E3/61 provides higher surge robustness at the cost of board space - making SMAJ22C-E3/61 optimal for space-constrained 24 V industrial sensors where 400 W margin suffices.
Availability
SMAJ22C-E3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for SMAJ22C-E3/61 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, rectifiers, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series was developed for surface-mount transient suppression in space-constrained, high-reliability environments - targeting automotive, industrial, and telecom systems where rapid clamping, low leakage, and AEC-Q101 readiness (via HE3 variants) are essential.
FAQ
What is the clamping voltage of SMAJ22C-E3/61 at its rated peak pulse current?
The SMAJ22C-E3/61 has a maximum clamping voltage (VC) of 39.4 V at 10.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88390 and ensures predictable voltage limiting for downstream 40 V-tolerant components. The SMAJ22C-E3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ22C-E3/61 unidirectional or bidirectional, and how is polarity identified?
SMAJ22C-E3/61 is a bi-directional TVS diode, meaning it clamps overvoltage transients equally in both directions - no cathode band or polarity marking is present on the DO-214AC (SMA) package. This allows symmetric placement across differential lines or floating nodes without orientation constraints. The "C" suffix in SMAJ22C-E3/61 explicitly denotes bi-directional configuration per Vishay's ordering nomenclature in document 88390.
What is the maximum steady-state reverse leakage current for SMAJ22C-E3/61 at its stand-off voltage?
The SMAJ22C-E3/61 exhibits a maximum reverse leakage current (ID) of 1 µA at its 22 V stand-off voltage (VWM), tested at TA = 25 °C per Table on page 2 of Vishay document 88390. This ultra-low leakage preserves signal integrity in high-impedance sensor bias networks and avoids unnecessary power drain in battery-operated equipment using the SMAJ22C-E3/61.
Does SMAJ22C-E3/61 meet automotive qualification standards?
The standard SMAJ22C-E3/61 is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring stress-tested reliability, Vishay offers the SMAJ22CHE3/61 variant (HE3 suffix), which is explicitly qualified to AEC-Q101. Engineers specifying SMAJ22C-E3/61 for under-hood use must verify system-level validation; the SMAJ22C-E3/61 itself carries no automotive qualification documentation.
What PCB pad layout is recommended to achieve the full 400 W peak pulse power rating for SMAJ22C-E3/61?
To achieve the rated 400 W peak pulse power, Vishay specifies mounting SMAJ22C-E3/61 on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal, as stated in the "Maximum Ratings" table on page 1 of document 88390. Smaller pads reduce thermal dissipation and derate pulse power - e.g., a 1.0 × 1.0 mm pad may limit sustained surge capability to ~250 W. The SMAJ22C-E3/61 datasheet Figure 5 further illustrates the recommended copper area for optimal thermal performance.
SMAJ22C-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 10.2A
- 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)
SMAJ22C-E3/61 FAQ
1.How can I place an order for SMAJ22C-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22C-E3/61 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 SMAJ22C-E3/61 reliable?
The price and inventory of SMAJ22C-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22C-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22C-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22C-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22C-E3/61?
SMAJ22C-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22C-E3/61 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 SMAJ22C-E3/61?
For technical support, including SMAJ22C-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22C-E3/61 requirements.
6.How does Aetrix verify that SMAJ22C-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22C-E3/61 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 SMAJ22C-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22C-E3/61?
All SMAJ22C-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22C-E3/61, 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 SMAJ22C-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ22C-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22C-E3/61 Tags
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