My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 3KASMC20HE3/9AT
- Part No.:
- 3KASMC20HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20HE3/9AT.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,622
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
3KASMC20HE3/9AT 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), 20 V stand-off voltage (VWM), and 32.4 V clamping voltage (VC) at 92.6 A peak surge current. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive power line protection.
For engineers reviewing the 3KASMC20HE3/9AT datasheet, 3KASMC20HE3/9AT pinout, 3KASMC20HE3/9AT application, or 3KASMC20HE3/9AT equivalent, this device serves as a high-reliability, high-temperature transient suppressor for DC bus lines, sensor interfaces, and MOSFET gate drivers where fast clamping (<1 ns response), low incremental surge resistance, and MSL Level 1 reflow compatibility are critical.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability under thermal stress. Its unidirectional configuration enables robust forward conduction during overvoltage events while maintaining low leakage (≤1.0 μA at 20 V) and stable breakdown (22.2–24.5 V at 1 mA).
The device delivers 3000 W peak pulse power with a 10/1000 μs waveform and clamps at 32.4 V when subjected to 92.6 A surge current. Thermal resistance is 77.5 °C/W (junction-to-ambient) and 18.3 °C/W (junction-to-leads), supporting operation up to TJ = 185 °C with derating above TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on under transients. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 92.6 A - Peak voltage seen by protected circuit during 3000 W surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 3000 W (10/1000 μs) - Sustains high-energy transients without failure; validated per ANSI/IEEE C62.35. |
| TJ max. | 185 °C - Enables use in under-hood automotive environments and high-ambient industrial controls. |
| Polarity | Unidirectional - Allows forward conduction during positive surges; requires correct cathode orientation on PCB. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm × 6.22 mm footprint and matte tin-plated leads. |
Pinout & Package
Package: DO-214AB (SMC), molded case meeting UL 94 V-0 flammability rating; cathode indicated by color band; terminals are matte tin plated and solderable per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during clamping | Connected to lower-potential side of protected line; must be routed with low-inductance path to ground reference. |
| Cathode | Reverse-biased terminal; clamping node | Marked with color band; connects to higher-potential line (e.g., +12 V rail); defines polarity-sensitive placement. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low IR drift over 1000+ thermal cycles at 150 °C. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, TCT, and ESD testing per JESD47 requirements. |
| MSL Level 1 | Rated for reflow peak of 260 °C; no floor life limitation; supports standard SMT assembly without dry pack. |
| Low clamping ratio (VC/VBR) | 1.46 (32.4 V / 22.2 V min) - Minimizes overvoltage overshoot during fast transients compared to competing TVS devices. |
| High IFSM rating | 200 A (8.3 ms half-sine) - Withstands repetitive load dump surges in 12 V vehicle systems without degradation. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power rail and ground, absorbing >3000 W surges within nanoseconds. Use Value: Prevents damage to downstream PMICs and microcontrollers by limiting rail voltage to ≤32.4 V during 92.6 A transients. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and switching noise in factory automation. IC Role / Device Role / Timing Role: Unidirectional TVS shunting induced spikes on signal lines referenced to local ground. Use Value: Maintains signal integrity with <1.0 μA leakage at 20 V, enabling accurate sub-mV measurements in 24-bit ADC systems. |
| MOSFET Gate Driver Protection | Telecom DC Power Input Stage |
Use Scenario: Safeguarding high-side N-channel MOSFET gates against Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Fast-response clamp placed between gate and source, triggered before gate oxide breakdown occurs. Use Value: Sub-1 ns response time and 32.4 V clamping prevent gate-source overvoltage exceeding 20 V rating of logic-level FETs. |
Use Scenario: Front-end surge suppression on -48 V telecom power supplies compliant with ITU-T K.20/21. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing lightning-induced surges on primary DC input before DC/DC converters. Use Value: 3000 W peak power rating meets Class B immunity requirements while maintaining 20 V operational margin on nominal -48 V rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Lower PPPM (400 W), same VWM (20 V), higher VC (32.5 V), DO-214AC (SMA) package | Limited to low-energy transients; unsuitable for load dump or high-current inductive switching | Select only for cost-sensitive consumer electronics with <500 W surge exposure. |
| SMCJ20A | Same PPPM (3000 W), identical VWM/VC specs, DO-214AB (SMC) package, but not AEC-Q101 qualified | Lacks automotive qualification; requires additional system-level validation for vehicular use | Prefer 3KASMC20HE3/9AT when AEC-Q101 compliance is mandatory for production release. |
Compared with SMAJ20A and SMCJ20A, the 3KASMC20HE3/9AT provides identical surge handling and clamping performance in the same SMC package while delivering certified automotive reliability-enabling drop-in replacement in AEC-Q101–required designs without layout or thermal redesign.
Availability
3KASMC20HE3/9AT is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, telecom power supplies, and MOSFET gate driver circuits requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 3KASMC20HE3/9AT 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 optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series was engineered specifically for AEC-Q101–compliant transient suppression in harsh-environment power electronics, emphasizing thermal stability up to 185 °C and robust surge endurance under repetitive stress.
FAQ
What is the maximum clamping voltage of the 3KASMC20HE3/9AT under rated surge conditions?
The 3KASMC20HE3/9AT clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 92.6 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 protected ICs and MOSFETs.
Is the 3KASMC20HE3/9AT suitable for automotive applications?
Yes, the 3KASMC20HE3/9AT is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for under-hood and body-control module applications. Its DO-214AB package, MSL Level 1 rating, and validated performance under load dump and ESD stress confirm its readiness for automotive production use.
What does the 'HE3/9AT' suffix indicate in the 3KASMC20HE3/9AT part number?
The 'HE3/9AT' suffix denotes the packaging configuration: 'HM3' indicates RoHS-compliant, AEC-Q101–qualified base construction; '/9AT' specifies 13-inch tape-and-reel delivery with 3500 units per reel. This matches Vishay's ordering code convention defined in Document Number 89962.
How does the thermal resistance of the 3KASMC20HE3/9AT affect PCB layout?
The 3KASMC20HE3/9AT has RθJA = 77.5 °C/W and RθJL = 18.3 °C/W. To maintain TJ ≤ 185 °C, PCB copper area under the SMC pad must follow Vishay's recommended minimum mounting layout (0.126" × 0.185") and avoid excessive trace length to thermal vias or ground planes.
Can the 3KASMC20HE3/9AT replace bidirectional TVS diodes in existing designs?
No-the 3KASMC20HE3/9AT is unidirectional only and cannot suppress negative-going transients on AC-coupled or bipolar signal lines. For bidirectional protection, a separate device such as SMBJ20CA or direct replacement with matched VWM/VC specs is required; polarity mismatch would cause forward conduction failure.
3KASMC20HE3/9AT 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 83.8A
- 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)
3KASMC20HE3/9AT FAQ
1.How can I place an order for 3KASMC20HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20HE3/9AT 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 3KASMC20HE3/9AT reliable?
The price and inventory of 3KASMC20HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC20HE3/9AT is usually 5 days.
3.What payment methods are accepted for 3KASMC20HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20HE3/9AT?
3KASMC20HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20HE3/9AT 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 3KASMC20HE3/9AT?
For technical support, including 3KASMC20HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20HE3/9AT requirements.
6.How does Aetrix verify that 3KASMC20HE3/9AT is sourced from the original manufacturer or authorized distributors?
All 3KASMC20HE3/9AT 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 3KASMC20HE3/9AT meets industry standards.
7.What is the process for return or replacement of 3KASMC20HE3/9AT?
All 3KASMC20HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20HE3/9AT, 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 3KASMC20HE3/9AT part is unused and in its original packaging.
Return procedure for 3KASMC20HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC20HE3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
