My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 3KASMC12HE3_A/I
- Part No.:
- 3KASMC12HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12HE3_A/I.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,230
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
3KASMC12HE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 19.9 V clamping voltage at 151 A IPPM, and qualified to AEC-Q101 for automotive electronics protection.
For engineers reviewing the 3KASMC12HE3_A/I datasheet, 3KASMC12HE3_A/I pinout, 3KASMC12HE3_A/I application, or 3KASMC12HE3_A/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, TJ = 185 °C junction rating, MSL Level 1 reflow compatibility, unidirectional polarity, and DO-214AB mechanical footprint compliance.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. It delivers fast response time and excellent clamping capability with a maximum clamping voltage of 19.9 V at 151 A peak pulse current.
Rated for operation from –65 °C to +185 °C, it supports automotive-grade reliability under high-reliability conditions and meets J-STD-020 MSL Level 1 with 260 °C peak reflow profile. Its unidirectional polarity and cathode band marking ensure correct PCB orientation during assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum reverse stand-off voltage before conduction; defines operating voltage ceiling for protected circuit |
| VBR (min/max) | 13.3 V / 14.7 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold |
| VC @ IPPM | 19.9 V - Clamping voltage at 151 A peak pulse current; limits transient voltage seen by downstream ICs |
| PPPM | 3000 W - Peak pulse power handling per 10/1000 μs waveform; enables robust protection against inductive load spikes |
| TJ max | +185 °C - Maximum junction temperature; supports under-hood automotive applications without derating |
| IFSM | 200 A - Non-repetitive forward surge current (8.3 ms half-sine); withstands high-energy transients without failure |
| IR @ VWM | 2.0 μA - Reverse leakage at 12 V; minimizes standby power loss in battery-powered systems |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads, UL 94 V-0 rated, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during overvoltage events |
| Cathode | Transient voltage sensing / clamping node | Connected to protected line (e.g., power rail or signal); initiates avalanche conduction when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including engine control units, body electronics, and ADAS sensor interfaces |
| Junction passivation | Enhanced long-term reliability under thermal cycling and humidity exposure in harsh environments |
| MSL Level 1 rating | Enables single-pass 260 °C reflow without moisture-induced damage; no bake required prior to assembly |
| Low RSURGE | Minimizes voltage overshoot during fast transients; critical for protecting sensitive gate drivers and microcontrollers |
| TJ = 185 °C capability | Eliminates thermal derating in high-ambient applications such as under-hood power distribution modules |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 13.3 V. Use Value: Limits rail voltage to ≤19.9 V during 3000 W transients, preventing latch-up or oxide breakdown in MCU power domains. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential signal lines (e.g., RS-485, CAN FD stubs) to suppress ESD and switching noise. Use Value: Sub-2 μA leakage at 12 V preserves signal integrity and avoids DC offset errors in precision measurement circuits. |
| Consumer Power Adapter Input Stage | Telecom DC Power Distribution |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD devices. IC Role / Device Role / Timing Role: Standoff-rated TVS across +VOUT and GND to absorb flyback spikes from synchronous rectifiers. Use Value: Withstands 200 A IFSM surges without degradation, ensuring multi-year field reliability in consumer charging infrastructure. |
Use Scenario: Primary protection for -48 V telecom power feeds entering base station backplanes. IC Role / Device Role / Timing Role: Unidirectional clamping device on supply input to protect DC-DC converters and FPGA power rails. Use Value: 185 °C TJ rating allows operation in sealed, fanless enclosures where ambient exceeds 105 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Same DO-214AC (SMA) package; lower PPPM (400 W), higher VC (20.1 V), lower IPPM (32.5 A) | Limited to low-energy transients; unsuitable for automotive load dump per ISO 7637-2 Pulse 5a | Select only for cost-sensitive consumer applications with <500 W surge requirements |
| SMCJ12A | Same DO-214AB (SMC) package; identical VWM/VBR/VC specs; AEC-Q101 qualified; 3000 W PPPM | Direct functional match; differs only in marking code and packaging suffix (e.g., HM3_A/I vs. M3_A/I) | Preferred drop-in alternative if 3KASMC12HE3_A/I lead time exceeds 12 weeks |
Compared with SMAJ12A and SMCJ12A, the 3KASMC12HE3_A/I offers identical clamping performance and automotive qualification in the same SMC package, but with Vishay's proprietary passivated anisotropic rectifier process delivering superior long-term surge endurance and thermal stability beyond 150 °C.
Availability
3KASMC12HE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC distribution requiring stable component supply, full traceability, and extended lifecycle support.
Supply support for 3KASMC12HE3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 3KASMC series belongs to Vishay's PAR® (Protective Avalanche Rectifier) family, engineered specifically for high-energy transient suppression in demanding automotive and industrial environments where thermal stability and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the 3KASMC12HE3_A/I at its rated peak pulse current?
The 3KASMC12HE3_A/I has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 151 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 19.9 V during surge events. The 3KASMC12HE3_A/I maintains this clamping performance across its full operating temperature range up to TJ = 185 °C.
Is the 3KASMC12HE3_A/I suitable for automotive applications?
Yes, the 3KASMC12HE3_A/I is AEC-Q101 qualified and rated for TJ = 185 °C, making it suitable for under-hood and chassis-mounted automotive applications including engine control units, body control modules, and ADAS sensor power supplies. Its DO-214AB package meets MSL Level 1, and its unidirectional architecture aligns with common 12 V rail protection topologies. The 3KASMC12HE3_A/I is explicitly designed for automotive-grade reliability per the Vishay PAR® product line.
What does the "_A/I" suffix mean in 3KASMC12HE3_A/I?
The "_A/I" suffix in 3KASMC12HE3_A/I denotes the packaging configuration: "A" indicates the base part is RoHS-compliant and AEC-Q101 qualified, while "I" specifies delivery in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units. This matches Vishay's ordering convention shown in Document Number 89962, where "I" corresponds to the 3500-unit reel option for HM3-series parts.
How does the 3KASMC12HE3_A/I compare to standard SMAJ or SMBJ series TVS diodes?
The 3KASMC12HE3_A/I delivers 3000 W peak pulse power in the larger DO-214AB (SMC) package, whereas SMAJ12A (DO-214AC) offers only 400 W and SMBJ12A (DO-214AA) provides 600 W. Its 19.9 V clamping voltage is tighter than SMBJ12A's 21.2 V, and its 185 °C TJ rating exceeds the 150 °C limit of most SMAJ/SMBJ parts. The 3KASMC12HE3_A/I is therefore specified for higher-energy, higher-temperature applications where the SMAJ/SMBJ families fall short.
What is the thermal resistance of the 3KASMC12HE3_A/I, and how does it affect layout design?
The 3KASMC12HE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 18.3 °C/W and junction-to-ambient (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout. To maintain safe operation at full 3000 W surge levels, PCB copper area must follow Vishay's DO-214AB mounting pad dimensions (0.126" min width, 0.185" max length). The 3KASMC12HE3_A/I's low RθJL enables effective heat transfer to PCB traces, reducing reliance on external heatsinking.
3KASMC12HE3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 136A
- 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)
3KASMC12HE3_A/I FAQ
1.How can I place an order for 3KASMC12HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12HE3_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 3KASMC12HE3_A/I reliable?
The price and inventory of 3KASMC12HE3_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 3KASMC12HE3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC12HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12HE3_A/I?
3KASMC12HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12HE3_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 3KASMC12HE3_A/I?
For technical support, including 3KASMC12HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12HE3_A/I requirements.
6.How does Aetrix verify that 3KASMC12HE3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC12HE3_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 3KASMC12HE3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC12HE3_A/I?
All 3KASMC12HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12HE3_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 3KASMC12HE3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC12HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12HE3_A/I 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 …
