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Vishay General Semiconductor - Diodes Division SMCJ20AHM3/I
- Part No.:
- SMCJ20AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AHM3/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,893
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Product details
Overview
SMCJ20AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, featuring 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 46.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive and industrial power rails.
For engineers reviewing the SMCJ20AHM3/I datasheet, SMCJ20AHM3/I pinout, SMCJ20AHM3/I application, or SMCJ20AHM3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), junction temperature range (–55 to +150 °C), and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, responding within picoseconds to voltage surges exceeding its breakdown threshold (VBR = 22.2–24.5 V). Its glass-passivated junction ensures stable avalanche behavior under repetitive surge stress, while low incremental surge resistance enables effective energy diversion without thermal runaway.
The SMCJ20AHM3/I is rated for 1500 W peak pulse power under standardized 10/1000 µs waveform conditions and supports 200 A non-repetitive forward surge current (IFSM), making it suitable for high-energy transient suppression in DC power distribution networks and automotive body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold |
| VC @ IPPM | 32.4 V - Clamped voltage seen by protected circuit during 46.3 A surge, limiting stress on downstream components |
| PPPM | 1500 W - Peak transient power dissipation capability under 10/1000 µs waveform |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads |
| TJ max | +150 °C - Maximum allowable junction temperature for reliable long-term operation |
| Polarity | Unidirectional - Cathode marked with band; blocks reverse current until breakdown |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to ground or low-impedance return path; conducts avalanche current during overvoltage events |
| Anode | Protected line connection | Connected to input rail or signal line being safeguarded; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies |
| Halogen-free (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-20 requirements for green manufacturing |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
| Fast response time (< 1 ps) | Clamps transients before propagation into sensitive analog or digital circuitry |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppresses load-dump spikes (up to 120 V) and alternator ripple on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Parallel-connected clamping TVS placed between VBAT and GND upstream of DC-DC converters. Use Value: Limits voltage excursion to ≤32.4 V during 46.3 A transients, preventing latch-up or gate oxide damage in downstream PMICs. | Use Scenario: Shields analog output lines of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input. Use Value: Clamps fast-rising ±8 kV contact ESD pulses to sub-35 V levels within <1 ps, preserving signal integrity and ADC accuracy. |
| DC Motor Drive Circuit Protection | Telecom Power Interface Protection |
Use Scenario: Absorbs inductive kickback from brushed DC motor commutation in HVAC actuators. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge supply rails to clamp flyback voltage. Use Value: Handles 200 A single-half-sine surge (IFSM), enabling robust protection without derating in intermittent duty cycles. | Use Scenario: Protects PoE-powered Ethernet switch ports from lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Primary-stage TVS on DC input side of isolated DC-DC converter feeding PHY interface. Use Value: Withstands 1500 W peak pulse energy while maintaining <1 µA leakage at 20 V, minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for space-constrained consumer electronics; not recommended for automotive under-hood use | Select when board area is critical and surge energy is ≤400 W |
| SMCJ20A-M3/57T | Same electrical specs but commercial-grade (non-AEC-Q101), M3 suffix (halogen-free, RoHS) | Lacks automotive qualification; acceptable for industrial controls with lower reliability requirements | Select when AEC-Q101 is not mandated and cost optimization is prioritized |
Compared with SMCJ20AHM3/I, SMAJ20AHE3/A offers smaller size but reduced surge handling and thermal performance, while SMCJ20A-M3/57T matches all electrical parameters but omits automotive qualification-making SMCJ20AHM3/I the only choice for AEC-Q101-compliant designs requiring full 1500 W clamping capability.
Availability
SMCJ20AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, telecom power interfaces, and sensor signal conditioning circuits requiring stable component supply and guaranteed AEC-Q101 qualification.
Supply support for SMCJ20AHM3/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 protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against load dump, ESD, and lightning surges is mandatory.
FAQ
What is the breakdown voltage range for SMCJ20AHM3/I?
The SMCJ20AHM3/I has a specified breakdown voltage (VBR) range of 22.2 V to 24.5 V at 1 mA test current, measured per ANSI/IEEE C62.35 standards. This range ensures consistent clamping onset across production lots and defines the minimum voltage at which the device enters avalanche conduction to protect downstream circuitry.
Is SMCJ20AHM3/I qualified for automotive applications?
Yes, SMCJ20AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in Vishay's ordering information table. This qualification validates its reliability under automotive temperature cycling, humidity, mechanical shock, and lifetime surge stress requirements-making it suitable for engine control, body electronics, and ADAS subsystems.
What does the "HM3" suffix mean in SMCJ20AHM3/I?
The "HM3" suffix in SMCJ20AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., M3) and confirms compliance with JEDEC J-STD-20 moisture sensitivity level 1 and JESD201 class 2 whisker resistance testing.
Can SMCJ20AHM3/I be used in bidirectional configurations?
No, SMCJ20AHM3/I is unidirectional only, as confirmed by its part number ending in "A" (not "CA") and explicit polarity marking (cathode band). For bidirectional protection, Vishay specifies variants like SMCJ20CA; using SMCJ20AHM3/I in reverse-biased AC applications would result in forward conduction and failure.
What is the maximum clamping voltage of SMCJ20AHM3/I under surge conditions?
The maximum clamping voltage (VC) of SMCJ20AHM3/I is 32.4 V at 46.3 A peak pulse current (IPPM), tested with a 10/1000 µs waveform. This value represents the highest voltage imposed on the protected circuit during worst-case transient events and is critical for ensuring compatibility with 3.3 V or 5 V logic supply tolerances.
SMCJ20AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ20AHM3/I FAQ
1.How can I place an order for SMCJ20AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AHM3/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 SMCJ20AHM3/I reliable?
The price and inventory of SMCJ20AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ20AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AHM3/I?
SMCJ20AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AHM3/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 SMCJ20AHM3/I?
For technical support, including SMCJ20AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AHM3/I requirements.
6.How does Aetrix verify that SMCJ20AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ20AHM3/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 SMCJ20AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ20AHM3/I?
All SMCJ20AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AHM3/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 SMCJ20AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ20AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20AHM3/I Tags
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