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Vishay General Semiconductor - Diodes Division SMCJ22AHM3/I
- Part No.:
- SMCJ22AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22AHM3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,173
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Product details
Overview
SMCJ22AHM3/I from Vishay is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 22 V standoff voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V clamping voltage (VC) at 42.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ22AHM3/I datasheet, SMCJ22AHM3/I pinout, SMCJ22AHM3/I application, or SMCJ22AHM3/I equivalent, key selection criteria include clamping performance under 42.3 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation, it remains high-impedance until transient voltage exceeds VBR, then rapidly switches to low-impedance conduction to clamp the line at ≤35.5 V. Its glass-passivated junction ensures stable leakage (<1.0 µA at 22 V) and fast response time (<1.0 ns).
Thermally, it supports continuous operation up to +150 °C junction temperature, with RθJL = 15 °C/W enabling effective heat transfer to PCB copper. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - validated for automotive-grade reliability per JESD22-B102 and J-STD-020 MSL level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 22 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 24 V systems. |
| VBR (Breakdown Voltage) | 24.4–26.9 V at 1 mA - precise threshold where avalanche conduction initiates; tight tolerance enables predictable protection onset. |
| VC (Clamping Voltage) | 35.5 V at IPPM = 42.3 A - maximum voltage seen by protected circuit during 1500 W transient; critical for IC-level survivability. |
| PPPM (Peak Pulse Power) | 1500 W (10/1000 µs) - energy-handling capacity for lightning-induced or inductive-switching surges; validated on 8.0 mm × 8.0 mm pads. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments without derating. |
| RθJA | 75 °C/W - thermal resistance to ambient; informs minimum copper area required for sustained 6.5 W dissipation at TA = 50 °C. |
| AEC-Q101 Qualified | Yes - qualified per stress test standard for automotive discrete semiconductors; supports PPAP documentation for Tier 1 suppliers. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity marked by cathode band; anode and cathode terminals align with standard SMC orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units and ADAS power supplies - meets vibration, temperature cycling, and HTRB requirements. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC JS709C; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 11.1 V) versus competing TVS devices - reduces stress on downstream MOSFETs and regulators. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking; supports high-volume automated assembly without moisture sensitivity concerns. |
| Glass passivated junction | Provides stable leakage current (<1.0 µA at VWM) across -55 °C to +150 °C and long-term reliability in humid industrial environments. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump transients (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input rail and chassis ground, absorbing >1500 W pulses without failure. Use Value: Clamps transients to ≤35.5 V, ensuring downstream DC/DC converters and microcontrollers remain within absolute maximum ratings. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response TVS mounted at connector entry point, shunting sub-100 ns ESD strikes before reaching precision op-amps. Use Value: Sub-1 ns response and <1.0 µA leakage preserve signal integrity and offset accuracy in 16-bit measurement systems. |
| Telecom DC Power Feeds | Consumer Power Adapter Outputs |
Use Scenario: Safeguarding PoE-powered equipment (IEEE 802.3af/at) from induced surges on 48 V DC distribution lines. IC Role / Device Role / Timing Role: Standoff-rated TVS on each powered device input rail, coordinated with upstream PSE surge protection. Use Value: 22 V VWM allows headroom above nominal 48 V (±10%) while clamping to 35.5 V - compatible with 40 V rated FETs and controllers. |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters (5–20 V output) exposed to fault conditions. IC Role / Device Role / Timing Role: Final-stage TVS on output connector, limiting fault voltage during short-circuit or feedback loop failure. Use Value: Halogen-free HM3 construction satisfies IEC 62368-1 fire safety requirements without compromising clamping performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC22H | Same VWM (22 V) and PPPM (1500 W), but in smaller SMA (DO-214AC) package; lower IPPM (37.5 A) and higher VC (38.0 V). | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a due to reduced surge margin. | Select only when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD (±15 kV air). |
| SMCJ22AHE3/I | Identical electrical specs and SMC package, but RoHS-compliant without halogen-free certification (E3 vs HM3); not AEC-Q101 qualified. | Restricted to commercial/industrial use; cannot support automotive PPAP or AEC reliability reporting. | Choose for cost-sensitive non-automotive designs where halogen content and automotive qualification are not mandated. |
Compared with SAC22H and SMCJ22AHE3/I, the SMCJ22AHM3/I delivers superior surge robustness (42.3 A IPPM), automotive-grade reliability (AEC-Q101), and halogen-free compliance - making it the sole option for safety-critical 24 V automotive power nodes requiring full ISO 7637-2 immunity.
Availability
SMCJ22AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom DC power feeds requiring stable component supply, AEC-Q101 validation, and halogen-free manufacturing compliance.
Supply support for SMCJ22AHM3/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 SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability under thermal cycling are mandatory.
FAQ
What is the clamping voltage of the SMCJ22AHM3/I at its rated peak pulse current?
The SMCJ22AHM3/I has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current (IPPM) of 42.3 A using the standard 10/1000 µs waveform. This value is measured under specified test conditions - mounted on 8.0 mm × 8.0 mm copper pads - and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ22AHM3/I maintains this clamping performance across its qualified operating temperature range.
Is the SMCJ22AHM3/I suitable for automotive applications?
Yes, the SMCJ22AHM3/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and Vishay's official documentation. It meets automotive-grade requirements for temperature cycling, humidity resistance, and surge robustness - specifically validated for use in engine control units, body electronics, and ADAS power supplies. The SMCJ22AHM3/I also complies with JESD22-B102 whisker testing and J-STD-020 MSL level 1 reflow standards, supporting full automotive PPAP submission.
How does the HM3 suffix differ from the E3 or HE3 suffixes in the SMCJ22A family?
The HM3 suffix on SMCJ22AHM3/I indicates halogen-free, RoHS-compliant construction *and* AEC-Q101 qualification. In contrast, E3 denotes RoHS compliance only (commercial grade), while HE3 adds AEC-Q101 qualification but lacks halogen-free certification. The SMCJ22AHM3/I is therefore the only variant meeting all three criteria - essential for automotive Tier 1 suppliers requiring both reliability validation and environmental compliance documentation.
What is the thermal resistance from junction to ambient for the SMCJ22AHM3/I?
The SMCJ22AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended minimum pad layout (0.31" × 0.31" copper pads). This value directly determines the allowable power dissipation at elevated ambient temperatures - for example, at TA = 50 °C, the device supports 6.5 W continuous power dissipation. Proper PCB copper area is critical to achieving this RθJA in actual layouts.
Can the SMCJ22AHM3/I be used in bidirectional configurations?
No, the SMCJ22AHM3/I is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the CA variant (e.g., SMCJ22CA), which lacks polarity marking and provides symmetrical clamping in both directions. Using the SMCJ22AHM3/I in reverse-biased AC applications would result in forward conduction and potential failure; always verify polarity alignment in schematic and layout for the SMCJ22AHM3/I.
SMCJ22AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 42.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ22AHM3/I FAQ
1.How can I place an order for SMCJ22AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22AHM3/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 SMCJ22AHM3/I reliable?
The price and inventory of SMCJ22AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ22AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ22AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22AHM3/I?
SMCJ22AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22AHM3/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 SMCJ22AHM3/I?
For technical support, including SMCJ22AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22AHM3/I requirements.
6.How does Aetrix verify that SMCJ22AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ22AHM3/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 SMCJ22AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ22AHM3/I?
All SMCJ22AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22AHM3/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 SMCJ22AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ22AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22AHM3/I Tags
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Diodes Incorporated
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