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Vishay General Semiconductor - Diodes Division SMCJ22HE3/9AT
- Part No.:
- SMCJ22HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22HE3/9AT.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
SMCJ22HE3/9AT from Vishay General Semiconductor is a surface-mount, AEC-Q101-qualified, uni-directional Transient Voltage Suppressor (TVS) diode in DO-214AB (SMCJ) package. It features 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR), 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 - designed for automotive-grade overvoltage protection of power rails and signal lines.
For engineers reviewing the SMCJ22HE3/9AT datasheet, SMCJ22HE3/9AT pinout, SMCJ22HE3/9AT application, or SMCJ22HE3/9AT equivalent, this part delivers validated surge robustness for 12 V automotive systems, meets JESD201 Class 2 whisker resistance, and supports automated placement on high-reliability PCBs without derating concerns up to +125 °C ambient.
Technical Context
This TVS diode operates as a uni-directional clamping device with a cathode-band polarity marker, optimized for fast response (<1 ns) to transient events such as load dump, ISO 7637-2 Pulse 1/2a/5a, and ESD per IEC 61000-4-2. Its glass-passivated junction ensures stable leakage performance and low incremental surge resistance under repetitive stress.
Thermal design is supported by RθJA = 75 °C/W (on 8 mm × 8 mm copper pads) and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C. The HE3 suffix confirms AEC-Q101 qualification and JESD201 Class 2 whisker resistance - critical for under-hood automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping initiates; matches nominal 12 V automotive supply with margin for ripple and transients. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - verified breakdown threshold ensures precise activation timing without premature conduction. |
| VC @ IPPM | 35.5 V at 42.3 A - clamping voltage limits downstream IC stress during 1500 W surge, staying well below typical 40 V MOSFET VDS ratings. |
| PPPM | 1500 W - peak pulse power rating for 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 5a (load dump) suppression. |
| TJ max. | +150 °C - maximum junction temperature enables deployment in engine control units and ADAS ECUs without thermal derating penalties. |
| Leakage ID | 1.0 μA at VWM - ultra-low reverse leakage preserves battery life in always-on automotive circuits. |
| Package | DO-214AB (SMCJ) - industry-standard surface-mount outline with 0.320" body length; compatible with IPC-7351B footprint and reflow profiles. |
Pinout & Package
DO-214AB (SMCJ) package: molded epoxy case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), RoHS-compliant, AEC-Q101 qualified. Cathode identified by single band on one end; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when VLINE exceeds VBR. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to chassis or system ground plane; completes clamping loop with minimal inductance for effective transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per JESD47. |
| Glass passivated junction | Ensures stable VBR and low leakage across -55 °C to +150 °C; eliminates parameter drift due to moisture ingress or contamination. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) surges up to 60 V/100 ms without degradation or thermal runaway. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under high humidity and thermal stress - essential for long-life automotive electronics. |
| Low Rsurge | Minimizes voltage overshoot during fast transients (e.g., ESD), improving clamping accuracy and protecting sensitive gate drivers. |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Input Stage |
|---|---|
Use Scenario: Suppressing load dump transients on 12 V battery-fed power rails in body control modules. IC Role / Device Role / Timing Role: Uni-directional TVS clamping device placed between input rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits rail voltage to ≤35.5 V during 1500 W surges, preventing damage to downstream DC/DC converters and microcontrollers rated for 40 V absolute maximum. |
Use Scenario: Protecting LIN bus interface and sensor supply inputs in engine management systems exposed to cranking spikes and alternator noise. IC Role / Device Role / Timing Role: Standby-mode surge suppressor with 1.0 μA leakage, maintaining low quiescent current while ready for sub-nanosecond response. Use Value: Enables compliance with ISO 11898-3 and ISO 7637-2 Pulse 1/2a without adding series impedance or compromising signal integrity on 12 V analog sensor supplies. |
| ADAS Camera Module Power Input | Infotainment System USB Power Line |
Use Scenario: Safeguarding 12 V input of rear-view camera modules mounted near exhaust systems where ambient temperatures exceed 105 °C. IC Role / Device Role / Timing Role: High-temperature-stable clamping diode with +150 °C TJ rating and RθJA = 75 °C/W on standard pad layout. Use Value: Maintains full 1500 W surge capability at +125 °C ambient - eliminating need for oversized heatsinks or derated layouts in space-constrained camera housings. |
Use Scenario: Adding secondary overvoltage protection on 5 V USB VBUS lines powered from vehicle 12 V via buck converter. IC Role / Device Role / Timing Role: Secondary TVS stage after primary DC/DC output filter, triggered only during catastrophic upstream failure (e.g., regulator short). Use Value: Clamps faulted VBUS to 35.5 V before USB PHY ICs (e.g., USB2514B) reach their 6 V absolute maximum, preventing latch-up and field returns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3/A | Lower PPPM (400 W), smaller DO-214AC (SMA) package, same VWM/VBR/VC specs. | Suitable for lower-energy transients (e.g., ESD-only) in space-constrained consumer modules; not rated for ISO 7637-2 Pulse 5a. | Select SMAJ22AHE3/A only when surge energy is limited to ≤400 W and board area is critical - not a drop-in replacement for automotive load dump. |
| SMCJ22A-E3/9AT | Same electrical specs and DO-214AB package, but commercial-grade (E3 suffix), lacking AEC-Q101 qualification and JESD201 Class 2 whisker resistance. | Acceptable for non-automotive industrial or computing applications where qualification and long-term whisker reliability are not mandated. | Choose SMCJ22A-E3/9AT for cost-sensitive non-automotive designs; SMCJ22HE3/9AT remains mandatory for OEM automotive BOMs requiring AEC-Q101 traceability. |
Compared with SMAJ22AHE3/A and SMCJ22A-E3/9AT, the SMCJ22HE3/9AT uniquely combines 1500 W surge capacity, AEC-Q101 validation, and JESD201 Class 2 whisker resistance - making it the sole option for production automotive power rail protection where load dump immunity and 15-year field reliability are non-negotiable.
Availability
SMCJ22HE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, ADAS camera modules, and infotainment system power inputs requiring stable component supply with full AEC-Q101 traceability and long-lifecycle support.
Supply support for SMCJ22HE3/9AT 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMCJ series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing thermal stability, surge endurance, and process-controlled whisker resistance for under-hood and chassis-mounted electronics.
FAQ
What is the clamping voltage of the SMCJ22HE3/9AT and how does it protect downstream components?
The SMCJ22HE3/9AT has a maximum clamping voltage (VC) of 35.5 V at 42.3 A peak pulse current. This value defines the upper voltage limit imposed on the protected line during a transient event. By holding the rail at or below 35.5 V, the SMCJ22HE3/9AT prevents overvoltage stress on downstream ICs - such as microcontrollers, CAN transceivers, and power management ICs - whose absolute maximum ratings often fall between 36 V and 40 V. Its low incremental surge resistance ensures minimal overshoot beyond VC during fast-rising transients.
Is the SMCJ22HE3/9AT suitable for bi-directional transient suppression?
No, the SMCJ22HE3/9AT is a uni-directional TVS diode, indicated by the "A" suffix (not "CA"). It conducts only when the cathode is positive relative to the anode - meaning it protects against positive-going transients on a line referenced to ground. For bi-directional protection (e.g., data lines or AC-coupled signals), a part with the "CA" suffix like SMCJ22CA must be used. Using SMCJ22HE3/9AT in bi-directional configurations risks failure during negative transients.
What does the "HE3" suffix signify in SMCJ22HE3/9AT?
The "HE3" suffix in SMCJ22HE3/9AT denotes two key qualifications: "H" indicates AEC-Q101 qualification for automotive applications, and "E3" confirms RoHS compliance and JESD201 Class 2 whisker resistance. This distinguishes it from the commercial-grade "E3" variant (e.g., SMCJ22A-E3/9AT), which lacks automotive qualification. The HE3 marking is traceable to Vishay's certified manufacturing lots and required for OEM automotive BOM acceptance.
Can the SMCJ22HE3/9AT be used in place of the older SMCJ22A-E3/9AT without PCB changes?
Yes - the SMCJ22HE3/9AT shares identical DO-214AB (SMCJ) package dimensions, pinout, solder pad layout, and thermal profile with SMCJ22A-E3/9AT. No PCB redesign is needed. However, the substitution introduces AEC-Q101 qualification and JESD201 Class 2 whisker resistance, making it suitable for automotive applications where the commercial-grade version is prohibited. Electrical parameters (VWM, VBR, VC, PPPM) are identical across both variants.
What is the maximum operating temperature and thermal resistance of the SMCJ22HE3/9AT?
The SMCJ22HE3/9AT has a maximum junction temperature (TJ) of +150 °C and a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This allows reliable operation in under-hood environments up to +125 °C ambient, assuming proper PCB copper area. Its junction-to-lead resistance (RθJL) is 15 °C/W, supporting efficient heat transfer to the PCB ground plane during sustained surge events.
SMCJ22HE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 38.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ22HE3/9AT FAQ
1.How can I place an order for SMCJ22HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22HE3/9AT 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 SMCJ22HE3/9AT reliable?
The price and inventory of SMCJ22HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ22HE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ22HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22HE3/9AT?
SMCJ22HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22HE3/9AT 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 SMCJ22HE3/9AT?
For technical support, including SMCJ22HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22HE3/9AT requirements.
6.How does Aetrix verify that SMCJ22HE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ22HE3/9AT 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 SMCJ22HE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ22HE3/9AT?
All SMCJ22HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22HE3/9AT, 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 SMCJ22HE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ22HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22HE3/9AT Tags
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