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Vishay General Semiconductor - Diodes Division SMAJ22CAHE3/5A
- Part No.:
- SMAJ22CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHE3/5A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,008
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Product details
Overview
SMAJ22CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, 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 10/1000 μs waveform - deployed on signal lines of automotive sensor units and industrial I/O interfaces.
For engineers reviewing the SMAJ22CAHE3/5A datasheet, SMAJ22CAHE3/5A pinout, SMAJ22CAHE3/5A application, or SMAJ22CAHE3/5A equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low thermal resistance (RθJL = 30 °C/W), 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: during transients exceeding VWM, it avalanches symmetrically in both directions to clamp voltage at ≤35.5 V while diverting surge current up to 11.3 A. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), with thermal performance validated under JEDEC J-STD-020 MSL Level 1 (260 °C peak reflow).
The device is rated for -55 °C to +150 °C operating junction temperature, supports repetitive surges at 0.01% duty cycle, and delivers consistent clamping across its full temperature range due to a low VBR temperature coefficient of 0.096 %/°C - critical for automotive and industrial environments where ambient extremes affect protection margins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed bidirectional breakdown window; ensures reliable turn-on without premature leakage. |
| VC @ IPPM | 35.5 V at 11.3 A - Measured clamping voltage under 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform on 5.0 mm × 5.0 mm copper pads; enables single-device protection for moderate-energy transients. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports unidirectional surge tolerance in hybrid protection schemes. |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; enables efficient heat transfer to PCB copper, sustaining reliability under repeated surges. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional surge path | Both terminals function identically; connects across protected line and ground (or between differential lines) without orientation constraint. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control, ADAS, and body electronics. |
| MSL Level 1 | Rated for peak reflow at 260 °C with unlimited floor life - eliminates baking requirements and supports high-yield automated assembly. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without degradation when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes let-through voltage during transients - protects 3.3 V and 5 V logic interfaces downstream of 24 V supply rails. |
| Glass passivated junction | Ensures stable VBR over time and temperature, with <1 μA leakage at VWM - critical for low-power always-on sensor nodes. |
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 modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional shunt clamping element placed directly at connector entry point to limit transient voltage before reaching interface ICs. Use Value: Clamps 22 V system transients to ≤35.5 V within nanoseconds, preserving signal integrity and preventing latch-up in 5 V tolerant receivers. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to 24 V DC field wiring subject to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on each isolated input channel, coordinated with series impedance and filtering. Use Value: Absorbs 400 W surge energy without failure, enabling >100,000 surge cycles per IEC 61000-4-4 compliance testing. |
| Consumer Power Adapter Output | Telecom Line Interface Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 12–24 V DC outputs of wall adapters and USB-PD auxiliary power supplies. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after DC-DC converter output filter to catch regulator fault conditions and external coupling. Use Value: Maintains 22 V nominal output stability while clamping fault voltages to 35.5 V - prevents damage to connected USB peripherals or charging circuits. |
Use Scenario: Protecting Ethernet PHYs and DSL line drivers from lightning-induced surges entering via RJ-45 jacks in residential gateways and base stations. IC Role / Device Role / Timing Role: First-stage coarse protection on differential pairs, preceding GDTs or polymer PTCs in multi-stage architectures. Use Value: Symmetric bidirectional clamping ensures equal protection on tip/ring or pair A/B, eliminating need for dual unidirectional devices. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated by OEM or regional regulation. | Choose SMAJ22CA-M3/5A when halogen-free bill-of-materials is required; otherwise SMAJ22CAHE3/5A offers same performance with standard RoHS compliance. |
| SMBJ22CAHE3/5A | Same VWM/VBR/VC, but SMB (DO-214AA) package - 25% larger footprint and higher PPPM (600 W). | Used where higher surge energy handling is needed or board layout allows larger pad area; not drop-in compatible due to different land pattern. | Select SMBJ22CAHE3/5A only if 600 W pulse power is required and PCB real estate permits SMB footprint; SMAJ22CAHE3/5A remains optimal for space-constrained 400 W applications. |
Compared with SMAJ22CA-M3/5A, SMAJ22CAHE3/5A provides identical protection performance with standard RoHS compliance, while SMBJ22CAHE3/5A trades compactness for higher surge capacity - making SMAJ22CAHE3/5A the balanced choice for AEC-Q101-compliant, space-sensitive 24 V system protection.
Availability
SMAJ22CAHE3/5A 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, AEC-Q101 traceability, and long-term production continuity.
Supply support for SMAJ22CAHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 validation, and precise clamping performance are mandatory.
FAQ
What does the "HE3" suffix indicate in SMAJ22CAHE3/5A?
The "HE3" suffix denotes that SMAJ22CAHE3/5A is RoHS-compliant and AEC-Q101 qualified, with "H" indicating automotive qualification and "E3" specifying commercial-grade RoHS compliance. This distinguishes it from non-automotive variants like SMAJ22CA-E3/5A and confirms suitability for under-hood and safety-critical vehicle subsystems.
Is SMAJ22CAHE3/5A bidirectional, and how is polarity identified?
Yes, SMAJ22CAHE3/5A is a bidirectional TVS diode - its electrical characteristics apply identically in both directions, with no cathode/anode distinction. Unlike unidirectional versions, it carries no band marking; the SMA (DO-214AC) package is symmetric, and either terminal may connect to line or ground without affecting clamping behavior.
What is the maximum clamping voltage of SMAJ22CAHE3/5A, and under what test condition?
The maximum clamping voltage of SMAJ22CAHE3/5A is 35.5 V, measured at a peak pulse current (IPPM) of 11.3 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMAJ22CAHE3/5A be used in place of a unidirectional TVS like SMAJ22AHE3/5A?
No - SMAJ22CAHE3/5A is not a direct replacement for unidirectional SMAJ22AHE3/5A. While both share VWM = 22 V and similar VBR, the unidirectional version requires correct cathode orientation and conducts forward current, whereas SMAJ22CAHE3/5A clamps symmetrically. Substitution requires verifying circuit topology supports bidirectional conduction and absence of DC bias constraints.
What PCB pad layout is recommended for optimal thermal and surge performance of SMAJ22CAHE3/5A?
Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for SMAJ22CAHE3/5A to achieve its rated 400 W peak pulse power and 30 °C/W junction-to-lead thermal resistance. Smaller pads reduce surge capability and increase junction temperature - use the recommended layout to ensure compliance with IEC 61000-4-5 and sustained reliability in repetitive surge scenarios.
SMAJ22CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22CAHE3/5A FAQ
1.How can I place an order for SMAJ22CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHE3/5A 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 SMAJ22CAHE3/5A reliable?
The price and inventory of SMAJ22CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHE3/5A?
SMAJ22CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHE3/5A 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 SMAJ22CAHE3/5A?
For technical support, including SMAJ22CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ22CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHE3/5A 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 SMAJ22CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHE3/5A?
All SMAJ22CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHE3/5A, 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 SMAJ22CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ22CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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