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Vishay General Semiconductor - Diodes Division 3KASMC22HE3_A/H
- Part No.:
- 3KASMC22HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC22HE3_A/H.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,345
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Product details
Overview
3KASMC22HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 22 V stand-off voltage (VWM), and 35.5 V clamping voltage (VC) at 84.5 A peak surge current. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive power rail protection.
For engineers reviewing the 3KASMC22HE3_A/H datasheet, 3KASMC22HE3_A/H pinout, 3KASMC22HE3_A/H application, or 3KASMC22HE3_A/H equivalent, this device serves as a high-reliability, high-temperature clamping solution for inductive switching transients on 24 V systems - especially where thermal robustness, low clamping ratio, and automotive qualification are mandatory.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable breakdown behavior under repeated surge stress and elevated temperature. Its unidirectional polarity enables integration into DC power lines with defined cathode orientation, and its 18.3 °C/W junction-to-lead thermal resistance supports reliable power dissipation without external heatsinking when mounted per recommended pad layout.
The device complies with MSL Level 1 (J-STD-020) and passes JESD201 Class 2 whisker testing, confirming suitability for automated SMT assembly and long-term reliability in harsh environments. Its 1.0 mA test current (IT) and 1.0 μA reverse leakage at VWM ensure tight parametric control across production lots.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC operating margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown occurs within this range at 1.0 mA IT; ensures consistent turn-on threshold across temperature and lot variation. |
| VC @ IPPM | 35.5 V at 84.5 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to ≤35.5 V under worst-case 3 kW transient. |
| PPPM | 3000 W - Peak pulse power handling capability per 10/1000 μs waveform; meets ISO 7637-2 Pulse 1 & 2b severity levels. |
| TJ max. | +185 °C - Enables operation in engine bay or powertrain modules without derating up to ambient +125 °C. |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT. |
| RθJL | 18.3 °C/W - Low junction-to-lead thermal resistance allows efficient heat transfer to PCB copper, supporting sustained surge duty cycles. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Complies with UL 94 V-0, RoHS-compliant, and JESD22-B102 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC input / low-side connection | Connected to ground or lower-potential node in unidirectional clamp configuration; carries full surge return current. |
| Cathode | Protected line / high-side connection | Connected to the line being protected (e.g., 24 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Stabilizes breakdown characteristics over 1000+ surge events and >1000 hrs HTOL at 150 °C. |
| MSL Level 1 rating | Enables unlimited floor life and reflow at 260 °C peak without moisture-induced cracking or delamination. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 16750-2 load dump edges), improving clamping fidelity. |
| 185 °C TJ capability | Supports placement near high-power components (e.g., DC/DC converters, motor drivers) without thermal derating penalties. |
| AEC-Q101 qualification | Covers HTGB, HTRB, TCT, and ESD (HBM ≥8 kV) - required for powertrain and body control module designs. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Suppressing load dump and alternator ripple transients on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and point-of-load regulator input. Use Value: Limits voltage excursion to ≤35.5 V during 3000 W surges, protecting downstream LDOs and microcontrollers rated for 36 V absolute max. |
Use Scenario: Guarding 24 V digital input channels against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary front-end transient suppressor ahead of optocoupler or Schmitt-trigger input stage. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5 (Combination Wave) while maintaining <1 μA leakage at 22 V. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
Use Scenario: Protecting -48 V telecom rectifier outputs from lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Bidirectional-capable system uses two unidirectional devices back-to-back; this part handles positive half-cycle clamping. Use Value: 35.5 V clamping at 84.5 A ensures downstream DC/DC converters survive 10/1000 μs transients without latch-up or overvoltage shutdown. |
Use Scenario: Shielding high-side gate driver ICs from Miller-induced voltage spikes during MOSFET switching in BLDC inverters. IC Role / Device Role / Timing Role: Clamp placed between gate driver output and gate resistor to limit dv/dt-induced overshoot. Use Value: Fast response time and low Rsurge limit spike amplitude to <36 V, preventing gate oxide stress beyond 20 V rating of typical 3.3 V logic-level drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400 W), same VWM (22 V), higher VC (35.5 V), DO-214AC (SMA) package. | Not suitable for 3 kW load dump; limited to signal-line or low-energy I/O protection. | Select only if surge energy is ≤400 W and board space constraints favor smaller SMA footprint. |
| SMCJ22A | Same PPPM (3000 W), identical VWM/VC specs, DO-214AB (SMC) package, but not AEC-Q101 qualified. | Lacks automotive qualification; requires additional reliability validation for vehicle programs. | Acceptable for industrial or telecom use where AEC-Q101 is not mandated, but not for OEM automotive BOMs. |
Compared with SMAJ22A and SMCJ22A, the 3KASMC22HE3_A/H delivers identical clamping performance and surge rating in the same SMC package while adding AEC-Q101 qualification and 185 °C junction capability - making it the only choice for thermally demanding, safety-critical automotive power rails.
Availability
3KASMC22HE3_A/H is available at Aetrix Electronics and suitable for automotive power distribution units, industrial programmable logic controllers, telecom DC power systems, and motor drive gate driver circuits requiring stable component supply across extended temperature and high-surge environments.
Supply support for 3KASMC22HE3_A/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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive power networks, emphasizing thermal stability, surge repeatability, and SMT manufacturability under extreme conditions.
FAQ
What is the maximum clamping voltage of the 3KASMC22HE3_A/H under a 10/1000 μs surge?
The 3KASMC22HE3_A/H clamps to a maximum of 35.5 V at 84.5 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 05-Mar-13, ensuring predictable overvoltage limiting for downstream 36 V-rated components. The 3KASMC22HE3_A/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC22HE3_A/H suitable for automotive applications?
Yes, the 3KASMC22HE3_A/H is AEC-Q101 qualified and rated for TJ = -65 °C to +185 °C, making it fully compliant for under-hood and powertrain applications. It has passed HTGB, HTRB, and temperature cycling tests per AEC-Q101 Rev D, and its DO-214AB package meets MSL Level 1 for lead-free reflow. The 3KASMC22HE3_A/H is explicitly designed for automotive 24 V system protection.
What does the "_A/H" suffix mean in 3KASMC22HE3_A/H?
The "_A/H" suffix in 3KASMC22HE3_A/H indicates packaging: "H" denotes 7-inch plastic tape-and-reel delivery (850 units per reel), and "A" identifies the base P/NHM3 variant - RoHS-compliant, AEC-Q101 qualified, and whisker-tested per JESD201 Class 2. The "E3" denotes matte tin plating. This full suffix confirms full automotive-grade material compliance and SMT-ready packaging for the 3KASMC22HE3_A/H.
How does the thermal resistance of the 3KASMC22HE3_A/H compare to similar TVS diodes?
The 3KASMC22HE3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 18.3 °C/W, significantly lower than standard SMA-packaged TVS diodes (~50–60 °C/W). This enables more efficient heat transfer to PCB copper pads, allowing the 3KASMC22HE3_A/H to sustain higher surge repetition rates and operate reliably at ambient temperatures up to +125 °C without external heatsinking.
Can the 3KASMC22HE3_A/H replace the older 3KASMC22A in existing designs?
Yes, the 3KASMC22HE3_A/H is a direct replacement for 3KASMC22A in terms of electrical specs, package (DO-214AB), and pinout. Both share identical VWM (22 V), VBR (24.4–26.9 V), VC (35.5 V), and PPPM (3000 W). The 3KASMC22HE3_A/H adds enhanced process control and updated qualification evidence, but no layout or schematic changes are needed when upgrading to the 3KASMC22HE3_A/H.
3KASMC22HE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- 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):
- 76.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
3KASMC22HE3_A/H FAQ
1.How can I place an order for 3KASMC22HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC22HE3_A/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 3KASMC22HE3_A/H reliable?
The price and inventory of 3KASMC22HE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC22HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC22HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC22HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC22HE3_A/H?
3KASMC22HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC22HE3_A/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 3KASMC22HE3_A/H?
For technical support, including 3KASMC22HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC22HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC22HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC22HE3_A/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 3KASMC22HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC22HE3_A/H?
All 3KASMC22HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC22HE3_A/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 3KASMC22HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC22HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC22HE3_A/H Tags
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