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Vishay General Semiconductor - Diodes Division 3KASMC22AHE3/9AT
- Part No.:
- 3KASMC22AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC22AHE3/9AT.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,172
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Product details
Overview
3KASMC22AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at ≤35.5 V under 84.5 A surge, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and sensor signal lines in engine control units and battery management systems.
For engineers reviewing the 3KASMC22AHE3/9AT datasheet, 3KASMC22AHE3/9AT pinout, 3KASMC22AHE3/9AT application, or 3KASMC22AHE3/9AT equivalent, key selection criteria include its 22 V stand-off voltage, 24.4–26.9 V breakdown range at 1 mA, AEC-Q101 qualification, DO-214AB (SMC) package thermal performance, and uni-directional polarity for DC rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress and high ambient temperatures. Its 185 °C maximum junction temperature and MSL Level 1 rating support reflow compatibility up to 260 °C peak, while low incremental surge resistance ensures minimal voltage overshoot during fast transients.
The device exhibits 77.5 °C/W junction-to-ambient thermal resistance on standard PCB pads and 18.3 °C/W junction-to-leads, enabling effective heat dissipation without heatsinks in space-constrained automotive modules. Its 1.0 μA reverse leakage at 22 V stand-off supports low-power system monitoring integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V automotive systems. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on before downstream IC damage. |
| PPPM | 3000 W (10/1000 μs) - Peak surge energy handling capacity; protects against ISO 7637-2 Pulse 1 & 2a transients. |
| IPPM | 84.5 A - Peak clamping current at which VC ≤ 35.5 V; determines minimum trace width and fuse coordination. |
| TJ max. | 185 °C - Enables operation in under-hood environments without derating; validated per AEC-Q101 stress tests. |
| Polarity | Uni-directional - Suitable only for DC line protection with defined anode/cathode orientation; cathode marked by band. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 3.20 mm × 6.22 mm footprint; compatible with automated placement. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by color band. Mounting requires minimum pad dimensions per Vishay specification: 3.20 mm (length) × 1.52 mm (width) per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; must be routed with low-inductance layout for effective clamping. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 24 V supply); color band identifies this terminal for correct orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTGB, HTRB, and temperature cycling - required for ECU and ADAS module deployment. |
| Junction passivation | Optimized anisotropic rectifier process reduces parameter drift over lifetime and improves stability at 150–185 °C junction temperatures. |
| MSL Level 1 | Rated for reflow soldering up to 260 °C peak without moisture-induced failure - eliminates baking requirement prior to assembly. |
| Low clamping ratio | VC/VBR ≈ 1.35 (35.5 V / 26.9 V) - Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices. |
| High IFSM | 200 A (8.3 ms half-sine) - Supports protection against load dump events in 12/24 V vehicle electrical systems. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Supply |
|---|---|
Use Scenario: Protection of 24 V microcontroller power input against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Uni-directional TVS clamp placed between main 24 V rail and LDO input, conducting only during overvoltage events. Use Value: Clamps surges to ≤35.5 V within nanoseconds, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies downstream. |
Use Scenario: Safeguarding gate driver ICs and isolated feedback circuits from inductive kickback in 3-phase inverters. IC Role / Device Role / Timing Role: Fast-response transient suppressor across DC bus rails and auxiliary bias supplies. Use Value: Withstands 3000 W pulses without degradation, maintaining isolation integrity and enabling >10-year field life in factory automation equipment. |
| Automotive Battery Management System (BMS) | Telecom Power Interface Module |
Use Scenario: Guarding cell monitor ICs and CAN transceiver power pins against hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V/3.3 V supply lines feeding analog front-end and communication interfaces. Use Value: 1.0 μA leakage at 22 V preserves low-quiescent-current design goals while providing <1 ns response to ESD-like transients. |
Use Scenario: Surge suppression on -48 V telecom power feeds exposed to lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Primary clamping device on DC input before DC/DC converters and PMICs. Use Value: 185 °C rating allows operation in sealed enclosures with no forced air cooling, reducing system BOM cost and complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400 W), smaller SMA package, 22 V VWM, same uni-directional polarity | Not AEC-Q101 qualified; limited to commercial/industrial use; insufficient for automotive load dump | Select when cost and board space are critical and automotive qualification is not required. |
| SMCJ22A | Same DO-214AB package, 3000 W rating, but VBR min/max = 24.4–27.1 V and VC = 35.5 V - identical clamping behavior | Also AEC-Q101 qualified; differs only in marking code and minor process revision; functionally interchangeable | Choose for second-source availability where Vishay SMCJ22A is already qualified in your design. |
Compared with SMAJ22A and SMCJ22A, the 3KASMC22AHE3/9AT provides identical surge capability and automotive qualification as SMCJ22A but with tighter VBR tolerance (24.4–26.9 V vs. 24.4–27.1 V) and optimized high-temperature stability - making it preferable for next-generation ECU designs requiring extended thermal margin.
Availability
3KASMC22AHE3/9AT is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, battery management systems, and telecom power interface modules requiring stable component supply with full AEC-Q101 compliance and long-lifecycle support.
Supply support for 3KASMC22AHE3/9AT 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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® family of high-power TVS diodes, engineered specifically for AEC-Q101-compliant surge protection in harsh-temperature automotive environments and mission-critical industrial power systems.
FAQ
What is the maximum clamping voltage of the 3KASMC22AHE3/9AT under peak surge conditions?
The 3KASMC22AHE3/9AT has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 84.5 A (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 standards and guarantees that protected downstream circuitry remains below critical overvoltage thresholds during transient events. The 3KASMC22AHE3/9AT maintains this clamping performance across its full operating temperature range up to 185 °C junction temperature.
Is the 3KASMC22AHE3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the 3KASMC22AHE3/9AT is explicitly AEC-Q101 qualified, as confirmed in Vishay document 89962. It undergoes stress testing for high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling - validating its reliability in automotive engine control units, battery management systems, and ADAS modules. The 3KASMC22AHE3/9AT also meets MSL Level 1 and RoHS compliance requirements for automotive manufacturing.
What does the "HE3/9AT" suffix indicate in the 3KASMC22AHE3/9AT part number?
The "HE3/9AT" suffix denotes Vishay's packaging and reel configuration: "HE3" identifies the base P/NHM3 variant (RoHS-compliant, AEC-Q101 qualified), while "9AT" specifies 13-inch diameter plastic tape-and-reel delivery with 3500 units per reel. This matches the ordering information in document 89962 and ensures compatibility with high-speed SMT pick-and-place equipment used in automotive electronics production.
How does the thermal performance of the 3KASMC22AHE3/9AT compare to standard SMA-package TVS diodes?
The 3KASMC22AHE3/9AT in DO-214AB (SMC) package offers significantly better thermal performance than SMA-packaged alternatives: its typical RθJA is 77.5 °C/W versus ~120–150 °C/W for SMA devices. This enables higher sustained power dissipation (6.0 W on infinite heatsink) and supports operation at 185 °C junction temperature - critical for under-hood automotive applications where ambient temperatures exceed 125 °C.
Can the 3KASMC22AHE3/9AT be used in bi-directional surge protection circuits?
No, the 3KASMC22AHE3/9AT is strictly uni-directional, as stated in the Vishay datasheet. It conducts only when the cathode is at a higher potential than the anode - making it suitable for DC rail protection but incompatible with AC line or bidirectional signal line protection. For bi-directional applications, engineers must select a dedicated bi-directional TVS such as the 3KASMC22CA variant, which is not represented by the 3KASMC22AHE3/9AT part number.
3KASMC22AHE3/9AT 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 84.5A
- 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)
3KASMC22AHE3/9AT FAQ
1.How can I place an order for 3KASMC22AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC22AHE3/9AT 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 3KASMC22AHE3/9AT reliable?
The price and inventory of 3KASMC22AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC22AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC22AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC22AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC22AHE3/9AT?
3KASMC22AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC22AHE3/9AT 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 3KASMC22AHE3/9AT?
For technical support, including 3KASMC22AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC22AHE3/9AT requirements.
6.How does Aetrix verify that 3KASMC22AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC22AHE3/9AT 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 3KASMC22AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC22AHE3/9AT?
All 3KASMC22AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC22AHE3/9AT, 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 3KASMC22AHE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC22AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC22AHE3/9AT Tags
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