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Vishay General Semiconductor - Diodes Division SMAJ22C-E3/5A
- Part No.:
- SMAJ22C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22C-E3/5A.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ22C-E3/5A 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 and power lines. It features a 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 I/O ports and sensor interfaces in industrial control systems.
For engineers reviewing the SMAJ22C-E3/5A datasheet, SMAJ22C-E3/5A pinout, SMAJ22C-E3/5A application, or SMAJ22C-E3/5A equivalent, key selection criteria include bi-directional surge capability, low clamping ratio (VC/VWM = 1.79), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 24.4 V (min) and 29.8 V (max) at 1 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge waveform per ANSI/IEEE C62.35, delivering consistent transient suppression without polarity dependence.
Thermal performance is characterized by 120 °C/W junction-to-ambient thermal resistance (RθJA) on 0.2 × 0.2" copper pads and 30 °C/W junction-to-lead (RθJL). The device sustains repetitive surges at 0.01% duty cycle and meets J-STD-020 MSL Level 1 with peak reflow temperature of 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 24 V nominal systems. |
| VC @ IPPM | 39.4 V - Clamped voltage during 10.2 A 10/1000 µs surge; limits downstream IC stress to sub-40 V during ESD or lightning-induced transients. |
| IPPM | 10.2 A - Peak surge current supported at rated clamping voltage; enables protection against IEC 61000-4-5 Level 3 (1 A–2 A line surge) with safety margin. |
| PPPM | 400 W - Peak pulse power handling (10/1000 µs); sufficient for automotive load-dump and industrial switching transient suppression. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in under-hood automotive, factory-floor PLCs, and outdoor telecom equipment. |
| Leakage Current | 1.0 µA max @ VWM - Negligible standby power loss; avoids signal integrity degradation in high-impedance sensor bias networks. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional configuration with no polarity marking - symmetrical terminal layout suitable for AC-coupled or floating signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bi-directional terminals conduct identically in either polarity; no cathode band marking required - simplifies PCB layout and eliminates orientation errors during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded sensor outputs without polarity constraints. |
| 400 W peak pulse power | Supports robust immunity to IEC 61000-4-5 surge events up to 2 kV (line-earth) in industrial environments with minimal derating. |
| Low clamping ratio (1.79) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic interfacing with 24 V field wiring. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile use (peak 260 °C), eliminating bake-out requirements and reducing manufacturing cost. |
| RoHS-compliant matte tin leads | Ensures solderability per J-STD-002/JESD22-B102 and whisker resistance per JESD201 Class 1A - essential for long-life automotive and medical applications. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors exposed to motor switching noise and cable coupling. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching ADC input or microcontroller GPIO. Use Value: Limits induced surges to ≤39.4 V, preserving 12-bit ADC accuracy and preventing latch-up in 3.3 V MCU I/O cells. |
Use Scenario: Safeguarding LIN bus transceivers and LED driver control lines in door modules subjected to battery load dump and ESD. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across LIN signal pair and VBAT-GND rails to absorb 10/1000 µs pulses without affecting 19.2 kbps data integrity. Use Value: Withstands 400 W surges while maintaining <1 µA leakage - avoids false wake-up and ensures sleep-mode current compliance (<100 µA). |
| Telecom Power Input Stage | Consumer USB-C Port Protection |
|
Use Scenario: Front-end surge suppression on 48 V DC power inputs of PoE-powered access points and base stations. IC Role / Device Role / Timing Role: Primary clamping device parallel to bulk capacitor, triggered within <1 ns to limit voltage overshoot during lightning-induced surges. Use Value: 22 V VWM provides 10% margin above 24 V nominal supply; 39.4 V VC prevents overvoltage damage to downstream DC-DC controllers. |
Use Scenario: Bidirectional overvoltage protection on USB-C CC and VCONN pins susceptible to hot-plug transients and ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to connector to suppress ±15 kV contact ESD (IEC 61000-4-2) without distorting high-speed signaling. Use Value: Symmetric clamping ensures equal protection for both CC1/CC2 roles; 1.0 µA leakage avoids interference with USB PD negotiation timing. |
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 | Identical electrical specs and package; CA suffix denotes same bi-directional construction per Vishay documentation. | No functional difference - CA and C suffixes are interchangeable per Vishay's ordering matrix and device marking code table. | Select SMAJ22CA-E3/5A only if legacy BOM references CA; otherwise SMAJ22C-E3/5A is functionally identical and fully substitutable. |
| SMCJ22CA | Higher 1500 W PPPM, larger DO-214AB (SMB) package, 42.1 V VC at 35.5 A IPPM. | Used where higher surge energy (e.g., IEC 61000-4-5 Level 4) or board space permits larger footprint; not drop-in due to different pad layout. | Choose SMCJ22CA only when system-level surge testing requires >400 W rating; SMAJ22C-E3/5A remains optimal for space-constrained 400 W applications. |
Compared with SMAJ22C-E3/5A, SMAJ22CA-E3/5A offers no electrical or mechanical distinction and serves as a direct form-fit-function match, whereas SMCJ22CA trades compactness for higher surge capacity - requiring PCB redesign but enabling stronger system-level immunity validation.
Availability
SMAJ22C-E3/5A is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body electronics, telecom power input, and consumer USB-C port protection requiring stable component supply and full traceability.
Supply support for SMAJ22C-E3/5A 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 and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained surface-mount applications, targeting industrial automation, automotive subsystems, and communications infrastructure where robustness and repeatability are critical.
FAQ
What is the clamping voltage of SMAJ22C-E3/5A under a 10/1000 µs surge?
The SMAJ22C-E3/5A clamps to a maximum of 39.4 V when subjected to its rated 10.2 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is guaranteed across temperature and lifetime per Vishay Document 88390, and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ22C-E3/5A bi-directional or uni-directional?
SMAJ22C-E3/5A is explicitly a bi-directional Transient Voltage Suppressor, as confirmed by the "C" suffix in its part number and verified in Vishay's electrical characteristics table. It exhibits identical breakdown and clamping behavior in both polarities, with no cathode marking required on the DO-214AC package.
Does SMAJ22C-E3/5A meet automotive qualification standards?
The standard SMAJ22C-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ22CHE3/5A variant (HE3 suffix), which carries AEC-Q101 qualification and high-reliability screening - SMAJ22C-E3/5A itself is intended for industrial and consumer use.
What is the maximum leakage current of SMAJ22C-E3/5A at its stand-off voltage?
At its 22 V stand-off voltage (VWM), the SMAJ22C-E3/5A exhibits a maximum reverse leakage current of 1.0 µA at 25 °C, as specified in Vishay's Electrical Characteristics table. This ultra-low leakage ensures minimal impact on high-impedance sensor bias networks and battery-powered system quiescent current budgets.
Can SMAJ22C-E3/5A be used in place of SMAJ22A-E3/5A?
No - SMAJ22C-E3/5A and SMAJ22A-E3/5A are not interchangeable. SMAJ22A is uni-directional (anode/cathode asymmetry), while SMAJ22C is bi-directional. Substituting one for the other risks open-circuit failure under reverse surge conditions or unintended conduction in AC signal paths.
SMAJ22C-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-E3/5A FAQ
1.How can I place an order for SMAJ22C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22C-E3/5A 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 SMAJ22C-E3/5A reliable?
The price and inventory of SMAJ22C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22C-E3/5A?
SMAJ22C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22C-E3/5A 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 SMAJ22C-E3/5A?
For technical support, including SMAJ22C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22C-E3/5A requirements.
6.How does Aetrix verify that SMAJ22C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22C-E3/5A 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 SMAJ22C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22C-E3/5A?
All SMAJ22C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22C-E3/5A, 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 SMAJ22C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ22C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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