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Vishay General Semiconductor - Diodes Division 3KASMC22HE3_A/I
- Part No.:
- 3KASMC22HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC22HE3_A/I.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
3KASMC22HE3_A/I 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), 24.4–26.9 V breakdown voltage (VBR), and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection on power rails and signal lines of engine control units and ADAS sensors.
For engineers reviewing the 3KASMC22HE3_A/I datasheet, 3KASMC22HE3_A/I pinout, 3KASMC22HE3_A/I application, or 3KASMC22HE3_A/I equivalent, key selection criteria include clamping voltage at rated surge current (35.5 V), AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and thermal resistance (RθJA = 77.5 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance across -65 °C to +185 °C operating range. Its unidirectional polarity and 1.0 mA test current ensure precise VBR specification with low incremental surge resistance and fast response time to ESD and load-switching transients.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow) and is qualified to AEC-Q101 for automotive under-hood applications. Thermal design relies on RθJL = 18.3 °C/W (junction-to-leads) and derating curves for sustained power dissipation up to 6.0 W at TL = 75 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR (min/max) | 24.4 V / 26.9 V at 1.0 mA - Confirmed breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 35.5 V at 84.5 A - Clamping voltage under 10/1000 μs surge; limits protected circuit stress during 3000 W events. |
| PPPM | 3000 W - Peak pulse power handling per 10/1000 μs waveform; supports high-energy automotive load dump immunity. |
| TJ max. | +185 °C - Enables placement near hot components (e.g., power MOSFETs, ignition drivers) without derating loss. |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD robustness. |
| MSL Level | Level 1 - No floor life limitation; supports standard SMT reflow without baking. |
Pinout & Package
Package: DO-214AB (SMC), molded in UL 94 V-0 compound, matte tin-plated leads, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential side of protected line. | Defines unidirectional conduction path; must be tied to ground or return rail for proper clamping. |
| Cathode | Current exit terminal in forward bias; marked by color band; connected to protected line. | Reverse-biased during normal operation; avalanche breakdown occurs here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and leakage (<1.0 μA at VWM) over lifetime and temperature. |
| High-TJ capability | Rated to +185 °C junction temperature enables use in under-hood automotive modules without thermal derating penalties. |
| Low clamping ratio | VC/VBR ≈ 1.42 - Tight clamping margin minimizes overvoltage exposure to downstream ICs like CAN transceivers or microcontrollers. |
| Robust surge handling | Withstands 200 A non-repetitive forward surge (8.3 ms half-sine) - suitable for alternator load dump and inductive switching events. |
| Automotive qualification | AEC-Q101 certified with full test report coverage including HTGB, H3TRB, and ESD (HBM >8 kV, CDM >1 kV). |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: Suppresses load dump transients (up to 60 V, 400 ms) on 12 V battery-fed power rails in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp surges before they reach LDOs and MCU power inputs. Use Value: Limits peak voltage to ≤35.5 V during 3000 W pulses, preventing brownout or latch-up in 5 V/3.3 V regulators. |
Use Scenario: Protects analog sensor inputs (e.g., MAP, TPS) and digital communication lines (LIN, CAN) from coupled transients in engine compartments. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 200 pF at 0 V) shunts fast spikes while preserving signal integrity. Use Value: Clamps 10/1000 μs transients within 1 ns response time, maintaining <100 mV noise margin on 5 V reference lines. |
| ADAS Camera Module Power Line | Industrial Motor Drive Gate Driver Protection |
Use Scenario: Shields 12 V input of image sensor SoCs and ISP power supplies against ignition noise and relay bounce in surround-view systems. IC Role / Device Role / Timing Role: Primary overvoltage guard upstream of DC-DC converters; operates continuously at TJ = 125 °C ambient. Use Value: Maintains <1.0 μA leakage at 22 V and 150 °C, avoiding quiescent current drift in always-on camera subsystems. |
Use Scenario: Guards isolated gate driver supply rails (e.g., 15 V bootstrap) against Miller-induced voltage spikes during IGBT switching. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across gate driver output and source, absorbing dv/dt-induced energy. Use Value: Withstands repeated 84.5 A surges without parameter shift, ensuring long-term reliability in 20 kHz PWM inverters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Same VWM (22 V), but lower PPPM (600 W); DO-214AA (SMB) package; RθJA = 85 °C/W. | Limited to lower-energy transients (e.g., ESD-only); unsuitable for load dump or high-current inductive switching. | Select when space-constrained layouts require smaller SMB footprint and surge requirements are ≤600 W. |
| SMCJ22A | Identical DO-214AB (SMC) package and 3000 W rating, but VBR min = 24.4 V (same), VC = 35.5 V (same); AEC-Q101 qualified. | Functionally identical clamping behavior and thermal performance; differs only in base P/N suffix and tape/reel coding. | Valid alternative if 3KASMC22HE3_A/I is unavailable; verify packaging code (HM3_A/I vs. HM3/57T) matches assembly line requirements. |
Compared with SMBJ22A and SMCJ22A, the 3KASMC22HE3_A/I delivers equivalent high-energy clamping in the same SMC package but with tighter process control for automotive production traceability and extended high-temperature stability up to 185 °C - critical for under-hood deployment where junction temperatures exceed 150 °C.
Availability
3KASMC22HE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, and ADAS camera modules requiring stable component supply with full AEC-Q101 compliance and MSL Level 1 reflow readiness.
Supply support for 3KASMC22HE3_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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The 3KASMC series is part of Vishay's PAR® (Protection and Regulation) transient suppressor family, engineered specifically for demanding automotive environments where sustained high-temperature operation and repeatable surge immunity are mandatory.
FAQ
What is the clamping voltage of the 3KASMC22HE3_A/I at its rated peak pulse current?
The 3KASMC22HE3_A/I has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current (IPPM) of 84.5 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees consistent overvoltage limiting for protected circuits. The 3KASMC22HE3_A/I maintains this clamping performance across its full operating temperature range up to +185 °C junction temperature.
Is the 3KASMC22HE3_A/I suitable for automotive under-hood applications?
Yes, the 3KASMC22HE3_A/I is explicitly qualified to AEC-Q101 and rated for continuous operation up to +185 °C junction temperature - making it suitable for under-hood automotive applications such as engine control units, transmission control modules, and ADAS radar units. Its DO-214AB (SMC) package meets MSL Level 1 and withstands multiple reflow cycles without degradation. The 3KASMC22HE3_A/I also passes high-temperature reverse bias (HTRB) and temperature cycling tests required for automotive grade reliability.
What does the "_A/I" suffix mean in 3KASMC22HE3_A/I?
The "_A/I" suffix in 3KASMC22HE3_A/I denotes the packaging configuration: "A" indicates RoHS-compliant, AEC-Q101-qualified base part (HM3), and "I" specifies 13-inch diameter plastic tape and reel delivery with 3500 units per reel. This matches Vishay's ordering code convention shown in the datasheet's Ordering Information table. The 3KASMC22HE3_A/I is not a functional variant - electrical and thermal specifications are identical to other HM3-suffixed versions of the same device.
How does the 3KASMC22HE3_A/I compare to bidirectional TVS diodes in the same package?
The 3KASMC22HE3_A/I is unidirectional only, meaning it conducts in forward bias and clamps reverse transients - unlike bidirectional variants that protect both polarities. This makes the 3KASMC22HE3_A/I ideal for DC power rail protection where polarity is fixed, offering lower leakage (<1.0 μA at 22 V) and tighter VBR tolerance than equivalent bidirectional parts. It cannot replace bidirectional TVS diodes on AC or floating signal lines without circuit redesign.
What is the thermal resistance from junction to ambient for the 3KASMC22HE3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) of the 3KASMC22HE3_A/I is 77.5 °C/W when mounted on the minimum recommended pad layout per the datasheet. This value assumes standard FR-4 PCB with copper area defined in the DO-214AB footprint. For higher power dissipation, thermal performance improves significantly when using the junction-to-leads resistance (RθJL = 18.3 °C/W) with thermally enhanced land patterns or external heatsinking.
3KASMC22HE3_A/I 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/I FAQ
1.How can I place an order for 3KASMC22HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC22HE3_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 3KASMC22HE3_A/I reliable?
The price and inventory of 3KASMC22HE3_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 3KASMC22HE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC22HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC22HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC22HE3_A/I?
3KASMC22HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC22HE3_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 3KASMC22HE3_A/I?
For technical support, including 3KASMC22HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC22HE3_A/I requirements.
6.How does Aetrix verify that 3KASMC22HE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC22HE3_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 3KASMC22HE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC22HE3_A/I?
All 3KASMC22HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC22HE3_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 3KASMC22HE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC22HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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