My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ20CAHM3/H
- Part No.:
- SMCJ20CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CAHM3/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,254
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ20CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 20 V standoff voltage (VWM), and clamping voltage of 32.4 V at 46.3 A peak pulse current. It protects sensitive signal lines and power rails in automotive ECUs and industrial sensor interfaces against lightning-induced transients and inductive switching spikes.
For engineers reviewing the SMCJ20CAHM3/H datasheet, SMCJ20CAHM3/H pinout, SMCJ20CAHM3/H application, or SMCJ20CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped shunt protector: during overvoltage events exceeding its 22.2–24.5 V breakdown range (VBR at 1 mA), it rapidly transitions to low-impedance conduction, limiting downstream voltage to ≤32.4 V. Its glass-passivated junction ensures stable leakage (<1 μA at 20 V) and fast response time (<1.0 ps).
Designed for surface-mount automated assembly, SMCJ20CAHM3/H meets MSL Level 1 per J-STD-020 (peak reflow 260 °C) and supports bidirectional surge suppression without polarity sensitivity-critical for AC-coupled data lines and differential bus protection where directionality is undefined.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering across temperature and unit variation. |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage under 10/1000 μs surge; determines maximum stress on protected ICs. |
| PPPM | 1500 W - Peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard 8 mm × 8 mm copper pads; informs thermal derating above 25 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with pick-and-place equipment. |
Pinout & Package
SMCJ20CAHM3/H uses a 2-terminal SMC (DO-214AB) package with no polarity marking-consistent with bidirectional TVS function. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path (bidirectional) | Conducts transient current in either polarity; connects to ground or common reference plane. |
| Cathode | Surge return path (bidirectional) | Identical functional role to Anode; no cathode band marking distinguishes this bidirectional variant. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Equal VBR, VC, and IPPM performance in both directions-enables single-device protection of AC signals and differential buses without polarity concerns. |
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements-supports use in engine control units, ADAS sensors, and infotainment systems without additional qualification effort. |
| Halogen-free & RoHS | HM3 suffix denotes halogen-free molding compound and RoHS-compliant construction-meets EU ELV and China RoHS environmental mandates. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients-enhances protection margin for sub-10 ns ESD events when combined with proper PCB layout. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile (peak 260 °C)-reduces manufacturing risk and eliminates bake-out requirements. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs in vehicle door modules exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt clamping device placed between signal line and chassis ground to divert >1 kV/10/1000 μs surges away from transceiver ESD structures. Use Value: Maintains signal integrity by clamping to ≤32.4 V while surviving 1500 W pulses-prevents latch-up and permanent damage to ISO 11898-compliant PHYs. | Use Scenario: Guarding RS-485/RS-422 differential pairs in factory automation PLC I/O modules against EFT and surge coupling from adjacent motor drives. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across A/B lines to clamp common-mode transients without disrupting DC bias or signal swing. Use Value: Symmetrical clamping ensures equal protection on both polarities-eliminates need for dual unidirectional devices and reduces BOM count by 50%. |
| Consumer Power Adapter Input | Telecom DSL Line Card |
Use Scenario: Secondary-side overvoltage protection on 12 V/24 V DC outputs of wall adapters subjected to lightning-induced surges via connected cables. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after DC-DC converter output filter to absorb residual energy not blocked by primary-side MOVs. Use Value: 20 V VWM provides 20 % margin above nominal 12 V rail-avoids false triggering while enabling full 1500 W surge absorption capability. | Use Scenario: Protecting ADSL/VDSL line interface ICs from longitudinal surges entering via telephone line jacks in residential gateways. IC Role / Device Role / Timing Role: Bidirectional suppressor bridging tip/ring lines to ground, rated for repeated 10/700 μs telecom surges per ITU-T K.21. Use Value: 32.4 V clamping voltage stays below absolute maximum ratings of common DSL transceivers (e.g., MAX232, SP3232)-ensures system-level immunity compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC20CA | Same VWM (20 V) and PPPM (1500 W), but in smaller SMA (DO-214AC) package; RθJA = 100 °C/W vs. 75 °C/W. | Limited to lower average power dissipation due to higher thermal resistance; unsuitable for sustained surge duty cycles in high-ambient environments. | Select SAC20CA only when board space is constrained and thermal budget allows for reduced derating. |
| SMCJ20CAHE3/H | Identical electrical specs and SMC package, but uses standard RoHS-compliant (non-halogen-free) molding compound; lacks HM3 halogen-free certification. | Acceptable for commercial/industrial use but fails halogen-free compliance requirements in automotive Tier 1 supply chains. | Choose SMCJ20CAHE3/H where environmental regulations do not mandate halogen-free materials. |
Compared with SAC20CA and SMCJ20CAHE3/H, SMCJ20CAHM3/H delivers superior thermal performance and full halogen-free compliance-making it the preferred choice for automotive and regulated industrial deployments requiring both reliability and material traceability.
Availability
SMCJ20CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interface, and telecom DSL line card designs requiring stable component supply, long-term lifecycle support, and AEC-Q101 qualified parts.
Supply support for SMCJ20CAHM3/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 high-reliability, high-efficiency solutions.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where robustness, consistency, and regulatory compliance are non-negotiable.
FAQ
What is the clamping voltage of SMCJ20CAHM3/H at its rated peak pulse current?
The SMCJ20CAHM3/H clamps to a maximum of 32.4 V when subjected to its rated 46.3 A peak pulse current (10/1000 μs waveform). This value is measured under standardized test conditions with 0.31" × 0.31" copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ20CAHM3/H maintains this clamping performance bidirectionally, ensuring consistent protection regardless of transient polarity.
Is SMCJ20CAHM3/H suitable for automotive applications?
Yes, SMCJ20CAHM3/H is AEC-Q101 qualified and explicitly designated for automotive use with the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It has undergone stress testing including temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 requirements. The SMCJ20CAHM3/H is deployed in engine control units, body electronics, and ADAS sensor modules where reliability under extended temperature ranges (−55 °C to +150 °C) is mandatory.
How does the bidirectional design of SMCJ20CAHM3/H affect its PCB layout?
The bidirectional design of SMCJ20CAHM3/H eliminates polarity marking-no cathode band is present-and allows placement across any two nodes requiring symmetrical overvoltage protection, such as differential signal pairs or AC-coupled lines. Unlike unidirectional TVS diodes, SMCJ20CAHM3/H requires no orientation verification during placement, reducing assembly errors. Its SMC (DO-214AB) footprint remains identical, but routing must ensure equal trace impedance to both terminals to preserve balanced clamping behavior.
What is the maximum steady-state power dissipation of SMCJ20CAHM3/H?
The SMCJ20CAHM3/H has a maximum steady-state power dissipation (PD) of 6.5 W at TA = 50 °C on an infinite heatsink. Under typical PCB conditions (0.31" × 0.31" copper pads), its thermal resistance is 75 °C/W, meaning it can safely dissipate ~1.7 W continuously at 25 °C ambient before reaching its 150 °C junction limit. The SMCJ20CAHM3/H is intended for transient-not continuous-power handling; sustained DC leakage must remain below 1 μA at 20 V to avoid thermal runaway.
Does SMCJ20CAHM3/H meet UL recognition standards?
Yes, SMCJ20CAHM3/H carries Underwriters Laboratories recognition under file number E136766 for both unidirectional and bidirectional transient suppressors, compliant with UL 497B for signal circuit protectors. This certification confirms its suitability for use in safety-critical telecommunications and industrial control equipment where third-party validation of surge protection performance is required. The SMCJ20CAHM3/H achieves this while maintaining its AEC-Q101 qualification and halogen-free material composition.
SMCJ20CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ20CAHM3/H FAQ
1.How can I place an order for SMCJ20CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CAHM3/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 SMCJ20CAHM3/H reliable?
The price and inventory of SMCJ20CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ20CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CAHM3/H?
SMCJ20CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CAHM3/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 SMCJ20CAHM3/H?
For technical support, including SMCJ20CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CAHM3/H requirements.
6.How does Aetrix verify that SMCJ20CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ20CAHM3/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 SMCJ20CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ20CAHM3/H?
All SMCJ20CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CAHM3/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 SMCJ20CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ20CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CAHM3/H 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 …
