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Vishay General Semiconductor - Diodes Division SMAJ22AHM3_A/I
- Part No.:
- SMAJ22AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHM3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ22AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 22 V stand-off 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ22AHM3_A/I datasheet, SMAJ22AHM3_A/I pinout, SMAJ22AHM3_A/I application, or SMAJ22AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and suitability for automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt protector: under normal bias it presents <1 μA reverse leakage at 22 V, then avalanches sharply above 24.4 V to clamp transient energy within nanoseconds. Its glass-passivated junction ensures stable breakdown and low capacitance (<100 pF at 1 MHz), while the SMA package supports thermal dissipation up to 3.3 W at 50 °C ambient.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits +0.096 %/°C temperature coefficient of VBR, enabling predictable clamping behavior across -55 to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 400 W transient; limits stress on downstream 3.3 V or 5 V logic rails. |
| PPPM | 400 W (10/1000 μs) - Peak surge handling capacity; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 events. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands inrush or load-dump surges without bond-wire failure. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized SMT footprint (5.28 mm × 4.50 mm); compatible with JEDEC MS-013AC and automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-axis molded case with cathode band marking. Dimensions: 5.28 mm × 4.50 mm × 2.29 mm (L × W × H). Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; completes clamping path during overvoltage events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V supply rail); avalanche conduction occurs from cathode to anode when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - suitable for engine control units and ADAS power domains. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 400 W peak pulse power (10/1000 μs) | Clamps 1 kV/500 A transients (per IEC 61000-4-5) while maintaining VC ≤ 35.5 V - protects 24 V CAN/LIN transceivers and microcontroller I/O. |
| Fast response time & low Rsurge | Sub-nanosecond turn-on enables suppression before sensitive components experience overstress; low dynamic impedance minimizes VC overshoot. |
| MSL Level 1 moisture sensitivity | Zero bake requirement prior to reflow; supports standard SMT assembly with peak temperature up to 260 °C. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load dump transients (up to 60 V, 100 ms) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 24 V rail and chassis ground, triggered within <1 ns upon exceeding VWM. Use Value: Limits clamped voltage to 35.5 V, preventing damage to 40 V-rated DC-DC controllers and CAN transceivers downstream. |
Use Scenario: Protecting analog output lines (4–20 mA) of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb ESD (±15 kV contact) and switching noise from solenoid drivers. Use Value: Maintains signal integrity by clamping transients below 35.5 V while adding <100 pF capacitance - negligible impact on 1 kHz bandwidth signals. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
|
Use Scenario: Secondary-side overvoltage protection in 12 V/24 V wall adapters subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated DC output, activated only during fault conditions (e.g., feedback loop failure). Use Value: Absorbs 400 W surge energy without degradation, ensuring adapter remains compliant with UL 62368-1 transient immunity requirements. |
Use Scenario: Safeguarding -48 V DC feeding circuits in telecom base station power distribution boards exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Unidirectional TVS connected between -48 V bus and return, leveraging negative rail compatibility of SMAJ series. Use Value: Clamps negative-going transients to -35.5 V, protecting PMICs and hot-swap controllers rated for -50 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3_A/I | Same electrical specs but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Approved for commercial/industrial use only; excluded from automotive production programs requiring AEC-Q101. | Select SMAJ22AHE3_A/I only if halogen-free content and automotive qualification are not required. |
| SMBJ22A-HM3_A/I | Higher 600 W PPPM rating, same VWM/VC, but larger SMB (DO-214AA) package (5.28 mm × 4.57 mm). | Requires PCB layout change due to wider body and different pad dimensions; better suited for higher-energy surge zones. | Choose SMBJ22A-HM3_A/I when system-level surge testing exceeds 400 W or when thermal margin is constrained. |
Compared with SMAJ22AHM3_A/I, SMAJ22AHE3_A/I lacks automotive qualification and halogen-free status, while SMBJ22A-HM3_A/I offers greater surge capacity at the cost of larger board area - making SMAJ22AHM3_A/I optimal for space-constrained AEC-Q101-compliant 24 V systems.
Availability
SMAJ22AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor modules, and telecom power feed applications requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMAJ22AHM3_A/I 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, efficiency, and application-specific optimization.
The SMAJ series was developed for robust, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, AEC-Q101 compliance, and repeatable clamping performance are critical.
FAQ
What is the maximum clamping voltage of the SMAJ22AHM3_A/I under a 400 W transient?
The SMAJ22AHM3_A/I has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current, corresponding to a 400 W transient with a 10/1000 μs waveform. This value is measured per Fig. 1 and Table 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMAJ22AHM3_A/I suitable for automotive applications?
Yes, the SMAJ22AHM3_A/I is AEC-Q101 qualified (denoted by the HM3 suffix), meaning it has passed stress tests for high-temperature operating life, temperature cycling, and ESD robustness required for automotive electronics. It is explicitly approved for use in engine control units, body electronics, and ADAS power domains - unlike non-HM3 variants such as SMAJ22A-E3/61. The SMAJ22AHM3_A/I also meets halogen-free and RoHS requirements mandated by major Tier 1 suppliers.
What does the "HM3" suffix indicate in SMAJ22AHM3_A/I?
The "HM3" suffix in SMAJ22AHM3_A/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" denotes halogen-free molding compound, "M3" confirms RoHS compliance per EU Directive 2011/65/EU, and the AEC-Q101 validation is documented in Vishay's qualification reports. This distinguishes it from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free) variants. The SMAJ22AHM3_A/I thus satisfies Tier 1 automotive material declarations and environmental compliance audits.
How does the SMAJ22AHM3_A/I compare to bidirectional TVS diodes like SMAJ22CA?
The SMAJ22AHM3_A/I is unidirectional and intended for DC line protection with defined polarity (cathode marked), whereas SMAJ22CA is bidirectional and symmetrical for AC or floating signal lines. SMAJ22AHM3_A/I offers lower leakage (<1 μA at 22 V) and tighter VBR tolerance than SMAJ22CA, but cannot suppress negative transients on positive rails without additional circuitry. For 24 V automotive power rails, SMAJ22AHM3_A/I is preferred; for RS-485 or Ethernet data lines, SMAJ22CA would be selected instead.
What PCB pad layout is recommended for optimal thermal performance of the SMAJ22AHM3_A/I?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of the SMAJ22AHM3_A/I to achieve rated 400 W pulse power and 3.3 W steady-state dissipation. These pads must be thermally connected to internal ground/power planes via ≥2 vias per pad (0.3 mm diameter, filled or plated). Deviating from this layout reduces surge capability - e.g., smaller pads may derate PPPM to 300 W or less. The SMAJ22AHM3_A/I datasheet Figure 2 provides exact thermal derating curves versus pad area.
SMAJ22AHM3_A/I 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:
- 1
- Bidirectional Channels:
- -
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ22AHM3_A/I FAQ
1.How can I place an order for SMAJ22AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHM3_A/I 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 SMAJ22AHM3_A/I reliable?
The price and inventory of SMAJ22AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ22AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHM3_A/I?
SMAJ22AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHM3_A/I 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 SMAJ22AHM3_A/I?
For technical support, including SMAJ22AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ22AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHM3_A/I 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 SMAJ22AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ22AHM3_A/I?
All SMAJ22AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHM3_A/I, 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 SMAJ22AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ22AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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