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Vishay General Semiconductor - Diodes Division SMAJ22AHM3/H
- Part No.:
- SMAJ22AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHM3/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,676
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Product details
Overview
SMAJ22AHM3/H 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 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA test current, 35.5 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), 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/H datasheet, SMAJ22AHM3/H pinout, SMAJ22AHM3/H application, or SMAJ22AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (<1 μA leakage at 22 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, clamping the line to ≤35.5 V within <1 ns response time. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 3.3 W at 50 °C ambient, and exhibits 0.096 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across -55 °C 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 for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - guaranteed breakdown onset range; ensures reliable triggering above system overvoltage thresholds. |
| VC @ IPPM | 35.5 V at 11.3 A - clamped voltage during 10/1000 μs transient; limits stress on downstream 3.3 V or 5 V logic components. |
| PPPM | 400 W - peak pulse power handling capability; sustains 10/1000 μs surges common in automotive load-dump and inductive switching events. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive environments and thermally constrained PCB layouts. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" × 0.157" footprint; compatible with JEDEC MS-013AC and J-STD-020 MSL Level 1 reflow. |
| Polarity | Unidirectional - cathode marked by band; blocks forward conduction until triggered, suitable for DC-biased protection paths. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 22-B102 solderability requirements. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transient event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); carries surge current to ground via anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability per stress test requirements - supports use in engine control units and ADAS power domains. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead-free terminations - satisfies EU ELV and China RoHS environmental mandates. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1/2a/5a transients without degradation - protects against load dump and inductive kickback in 24 V systems. |
| Fast response time | <1 ns turn-on latency - clamps transients before sensitive CMOS inputs or gate drivers experience overstress. |
| Low incremental surge resistance | Minimizes VC overshoot during high-di/dt events - maintains tighter clamping window than standard Zener-based protectors. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply lines in body control modules against ISO 7637-2 load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and chassis ground, activated only during overvoltage events. Use Value: Limits clamped voltage to 35.5 V, ensuring downstream regulators and microcontrollers remain within absolute maximum ratings. |
Use Scenario: Safeguarding analog output lines of pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS connected from signal line to ground, suppressing ESD and switching noise coupled onto 0–10 V outputs. Use Value: With 1 μA leakage at 22 V, avoids loading precision sensor scaling resistors while clamping fast transients to ≤35.5 V. |
| DC-DC Converter Input Stage | Motor Drive Gate Driver Supply |
|
Use Scenario: Input protection for 24 V input buck converters in telecom power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and controller IC. Use Value: 400 W PPPM rating absorbs repetitive 10/1000 μs surges without thermal runaway, supporting >100,000 surge cycles. |
Use Scenario: Clamping gate drive supply (e.g., 15 V isolated rail) in BLDC motor inverters exposed to cross-conduction spikes. IC Role / Device Role / Timing Role: Fast-acting TVS parallel to gate driver VDD capacitor, diverting nanosecond-scale shoot-through energy. Use Value: Sub-1 ns response prevents gate oxide damage in SiC MOSFET drivers operating at >100 kHz switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3/H | Same electrical specs, but RoHS-compliant without halogen-free compound; E3 suffix instead of HM3. | Acceptable for commercial/industrial use where halogen-free requirement is not mandated (e.g., non-automotive CE-marked equipment). | Select SMAJ22AHE3/H if halogen content is unrestricted and cost optimization is prioritized over automotive environmental compliance. |
| SMBJ22A-H | Higher 600 W PPPM rating, larger SMB (DO-214AA) package, same VWM/VBR/VC specs; not AEC-Q101 qualified. | Suitable for higher-energy transients but requires larger PCB area and lacks automotive qualification. | Choose SMBJ22A-H only when surge energy exceeds 400 W and AEC-Q101 is not required - e.g., industrial UPS backup circuits. |
Compared with SMAJ22AHE3/H and SMBJ22A-H, the SMAJ22AHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and compact SMA footprint - making it the optimal choice for space-constrained, automotive-grade 24 V rail protection where regulatory compliance and thermal reliability are critical.
Availability
SMAJ22AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and DC-DC converter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ22AHM3/H 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 performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMAJ22AHM3/H under a 10/1000 μs surge?
The SMAJ22AHM3/H has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs like microcontrollers or gate drivers remain within their absolute maximum ratings.
Is the SMAJ22AHM3/H qualified for automotive applications?
Yes, the SMAJ22AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code and documented in Vishay's ordering information table (page 3, document 88390). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS power supplies.
What does the "HM3" suffix indicate for SMAJ22AHM3/H?
The "HM3" suffix in SMAJ22AHM3/H specifies halogen-free, RoHS-compliant construction with matte tin-plated leads, meeting JESD 201 Class 2 whisker resistance. It also denotes compliance with automotive qualification standards (AEC-Q101), distinguishing it from commercial-grade variants like E3. This suffix directly maps to Vishay's material categorization system defined in document 99912 and ensures environmental and reliability alignment with Tier 1 automotive supply chain requirements.
Can SMAJ22AHM3/H be used in bidirectional signal line protection?
No, SMAJ22AHM3/H is unidirectional - indicated by the "A" (not "CA") in its part number and confirmed by its cathode band marking. For bidirectional protection (e.g., RS-485 or USB data lines), a variant like SMAJ22CA must be selected. Using SMAJ22AHM3/H on AC-coupled or symmetric signal paths would result in forward conduction during negative half-cycles, causing malfunction or damage.
What is the thermal resistance of SMAJ22AHM3/H, and how does it affect layout?
The SMAJ22AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This means a 1 W power dissipation raises junction temperature by ~120 °C above ambient - so for continuous operation near its 3.3 W rating, adequate copper pour or thermal vias are essential. Layout must follow Vishay's mounting pad dimensions (page 5, document 88390) to maintain specified thermal performance and avoid derating.
SMAJ22AHM3/H 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:
- 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/H FAQ
1.How can I place an order for SMAJ22AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHM3/H 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/H reliable?
The price and inventory of SMAJ22AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ22AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHM3/H?
SMAJ22AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHM3/H 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/H?
For technical support, including SMAJ22AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHM3/H requirements.
6.How does Aetrix verify that SMAJ22AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ22AHM3/H?
All SMAJ22AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ22AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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