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Vishay General Semiconductor - Diodes Division SMCJ20AHM3/H
- Part No.:
- SMCJ20AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20AHM3/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,071
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Product details
Overview
SMCJ20AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 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 - deployed in automotive ECUs, industrial motor drives, and telecom power supplies.
For engineers reviewing the SMCJ20AHM3/H datasheet, SMCJ20AHM3/H pinout, SMCJ20AHM3/H application, or SMCJ20AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, low incremental surge resistance, and verified clamping performance under repetitive transients per IEC 61000-4-5.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device triggered by reverse-biased avalanche breakdown above its 22.2–24.5 V breakdown voltage (VBR) at 1 mA test current. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling suppression of ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (IEC 61000-4-5).
Thermally, it sustains 150 °C maximum junction temperature with 75 °C/W junction-to-ambient thermal resistance (RθJA) on standard 8.0 mm × 8.0 mm copper pads. The unidirectional polarity - marked by cathode band - defines anode-to-cathode conduction path during transient events, requiring correct PCB orientation for DC rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin. |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - Confirmed avalanche threshold range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 1500 W - Peak transient energy handling capacity; supports Level 4 IEC 61000-4-5 (4 kV line-to-ground) compliance. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage at rated stand-off; avoids parasitic loading on sensitive analog or low-power circuits. |
| TJ max. | +150 °C - Extended thermal rating enabling use in under-hood automotive environments and enclosed industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow). Cathode identified by black band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-201 Class 2 whisker resistance and global environmental regulations without compromising surge robustness. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (1.45×) - reduces voltage overshoot during fast-rising transients compared to higher-Rsurge TVS devices. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter drift <±5% over 1000 hrs HTOL at 125 °C - critical for mission-critical industrial systems. |
| MSL Level 1 moisture sensitivity | Allows indefinite floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between VCC and GND, activated within picoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤32.4 V, preventing MCU brownout or latch-up while surviving ≥1000 surges per ISO 16750-2. | Use Scenario: Safeguarding gate driver IC supply rails in 3-phase inverter modules exposed to IGBT switching noise and inductive kickback. IC Role / Device Role / Timing Role: DC bus TVS connected across isolated DC/DC converter output to suppress coupled transients from high-di/dt power stages. Use Value: Maintains gate driver functionality by clamping spikes before they exceed 30 V absolute maximum rating, avoiding false triggering or destruction. |
| Telecom DC Power Interface | Consumer USB-C Power Delivery |
Use Scenario: Front-end protection of 48 V PoE-powered Ethernet switches against lightning-induced surges on data+power lines per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on PSE side, coordinated with secondary-side MOVs and gas discharge tubes in multi-stage architecture. Use Value: Absorbs up to 1500 W of surge energy without degradation, preserving Ethernet PHY integrity and reducing need for redundant protection layers. | Use Scenario: Overvoltage guard on USB-C VBUS line during hot-plug events or adapter fault conditions where 20 V input may spike beyond specification. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of buck converter and load switch to limit VBUS excursions before protection IC responds. Use Value: Responds faster than integrated OVP circuits (sub-ns vs. μs), preventing damage to USB PD controller and port controller ICs during fast transients. |
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), smaller SMA package (DO-214AC), same VWM/VBR/VC specs. | Limited to lower-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 Level 3+ or load dump. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4 only. |
| SMCJ20A-M3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and non-halogen-free M3 suffix. | Approved for industrial/commercial use only; not certified for automotive under-hood deployment. | Choose for cost-sensitive non-automotive designs where AEC-Q101 and halogen-free compliance are not required. |
Compared with SMAJ20AHE3/A and SMCJ20A-M3/57T, the SMCJ20AHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free construction - making it the only option among the three validated for automotive power rail protection in harsh thermal and reliability environments.
Availability
SMCJ20AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drive interfaces, and telecom power supply designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ20AHM3/H 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 is part of Vishay's TRANSZORB® TVS platform engineered for high-energy transient suppression in automotive, industrial, and communications infrastructure - prioritizing clamping precision, thermal stability, and qualification-grade consistency.
FAQ
What is the maximum clamping voltage of the SMCJ20AHM3/H under a 10/1000 μs surge?
The SMCJ20AHM3/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 46.3 A using the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The SMCJ20AHM3/H maintains this clamping performance across its operational temperature range and after repeated surge events, provided derating guidelines are followed.
Is the SMCJ20AHM3/H suitable for automotive applications?
Yes, the SMCJ20AHM3/H is AEC-Q101 qualified and specifically designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets requirements for under-hood and chassis-mounted modules, including thermal cycling, high-temperature reverse bias, and mechanical shock testing. The SMCJ20AHM3/H is commonly deployed in engine control units, body control modules, and ADAS power domains where sustained reliability under transient stress is mandatory.
How does the SMCJ20AHM3/H differ from the SMCJ20A-M3/57T?
The SMCJ20AHM3/H and SMCJ20A-M3/57T share identical electrical specifications (VWM = 20 V, VC = 32.4 V, PPPM = 1500 W) and SMC (DO-214AB) package, but differ in qualification and material compliance. The SMCJ20AHM3/H carries the HM3 suffix indicating AEC-Q101 qualification and halogen-free construction, whereas SMCJ20A-M3/57T is commercial-grade only. Therefore, the SMCJ20AHM3/H is approved for automotive use, while SMCJ20A-M3/57T is restricted to industrial or consumer applications.
What is the reverse leakage current of the SMCJ20AHM3/H at its stand-off voltage?
The SMCJ20AHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 20 V, measured at 25 °C. This ultra-low leakage ensures minimal power loss and avoids interference with low-current sensor circuits or battery-backed systems. The SMCJ20AHM3/H maintains leakage below 5.0 μA even at 125 °C junction temperature, supporting stable operation in thermally demanding environments.
Does the SMCJ20AHM3/H require special PCB layout considerations?
Yes - optimal performance of the SMCJ20AHM3/H requires adherence to Vishay's recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve specified thermal resistance (RθJA = 75 °C/W) and surge current rating. Short, wide traces to ground and minimized loop area are essential to preserve sub-nanosecond response. The SMCJ20AHM3/H cathode band must be oriented toward the protected line, and no thermal relief should be used on pads to maintain current-handling integrity during surge events.
SMCJ20AHM3/H 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/H FAQ
1.How can I place an order for SMCJ20AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20AHM3/H 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/H reliable?
The price and inventory of SMCJ20AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ20AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20AHM3/H?
SMCJ20AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20AHM3/H 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/H?
For technical support, including SMCJ20AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20AHM3/H requirements.
6.How does Aetrix verify that SMCJ20AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ20AHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMCJ20AHM3/H?
All SMCJ20AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20AHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMCJ20AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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