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Vishay General Semiconductor - Diodes Division SMCJ43A-M3/9AT
- Part No.:
- SMCJ43A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43A-M3/9AT.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ43A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, with 43 V standoff voltage (VWM), 47.8–52.8 V breakdown voltage (VBR at 1 mA), and 1500 W peak pulse power (10/1000 µs). It clamps transients to ≤69.4 V at 21.6 A surge current and operates from –55 °C to +150 °C, protecting MOSFETs and ICs in automotive power rails.
For engineers reviewing the SMCJ43A-M3/9AT datasheet, SMCJ43A-M3/9AT pinout, SMCJ43A-M3/9AT application, or SMCJ43A-M3/9AT equivalent, this page delivers verified electrical specs, thermal behavior, polarity marking, RoHS/halogen-free compliance status, and AEC-Q101 qualification path - all critical for ESD/surge protection design-in and automotive BOM validation.
Technical Context
The SMCJ43A-M3/9AT uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient overvoltages, with low incremental surge resistance enabling stable clamping under repetitive 10/1000 µs surges. Its unidirectional polarity (cathode band marked) supports DC-biased lines like 48 V automotive supply rails and industrial sensor power inputs.
Thermally, it features RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, supporting sustained 6.5 W power dissipation at TA = 50 °C. The M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected line's nominal DC voltage. |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature leakage. |
| VC @ IPPM | 69.4 V at 21.6 A - Clamping voltage under full 1500 W surge defines worst-case stress on downstream ICs. |
| IPPM | 21.6 A - Peak pulse current capability with 10/1000 µs waveform; determines minimum trace width and fuse coordination. |
| PPPM | 1500 W - Surge power rating validated per ANSI/IEEE C62.35; enables protection against ISO 7637-2 Pulse 1/2/5a in 12/24/48 V systems. |
| TJ max. | +150 °C - Junction temperature limit supports under-hood automotive placement and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ43A-M3/9AT is housed in an SMC (DO-214AB) package: a rectangular, molded plastic case with two coplanar matte tin-plated leads, cathode identified by a visible band. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; must be tied to ground or return rail when used as shunt clamp. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential side (e.g., 43 V rail); conducts during positive transients to clamp voltage to ≤69.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands severe ISO 7637-2 Pulse 5a (500 V/2 Ω) and IEC 61000-4-5 Combination Wave (4 kV) without degradation. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on downstream 48 V-rated components such as gate drivers and CAN transceivers. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive ELV Directive and IPC-1752A material declaration requirements for Tier 1 supply chains. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking preconditioning. |
| –55 °C to +150 °C operating range | Validated for engine control units (ECUs), battery management systems (BMS), and industrial PLC I/O modules. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 48 V mild-hybrid vehicle power distribution networks from load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS diode placed across main supply rail upstream of DC-DC converters and microcontrollers. Use Value: Limits transient excursions to ≤69.4 V, preventing latch-up or gate oxide damage in 75 V-rated power MOSFETs and PMICs. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to relay switching noise. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, absorbing negative-going spikes induced by inductive field devices. Use Value: Maintains signal integrity below 100 mV error band during 1 kV/µs transients, preserving 12-bit ADC accuracy. |
| Telecom DC Power Input Protection | OBD-II Diagnostic Port Surge Suppression |
Use Scenario: Securing 48 V PoE-powered telecom equipment front-end against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on DC input stage, coordinated with upstream GDT and downstream π-filter. Use Value: Absorbs up to 1500 W of surge energy within 100 ns, reducing let-through voltage to <70 V for secondary-stage TVS and LDOs. | Use Scenario: Hardening OBD-II connector pins (pins 4, 5, 16) against ESD and jump-start transients in vehicle service bays. IC Role / Device Role / Timing Role: Discrete unidirectional TVS mounted directly at connector footprint, with cathode tied to battery+ (pin 16). Use Value: Survives ≥20,000 cycles of ±15 kV contact discharge per IEC 61000-4-2 while maintaining VWM stability and leakage <1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A-M3/57T | Same VWM, VBR, and PPPM, but SMB (DO-214AA) package - 3.5 mm × 4.6 mm footprint, 25 % smaller area, 50 % lower thermal mass. | Lower surge handling margin in sustained multi-pulse events due to reduced copper pad area; suited for space-constrained consumer ports. | Select SMBJ43A-M3/57T only if board space is critical and single-event surge dominates; verify thermal derating per Fig. 2. |
| SMCJ43CA-M3/9AT | Bidirectional variant: identical VWM (43 V), VBR (47.8–52.8 V), and PPPM (1500 W), but no polarity marking and symmetric clamping in both directions. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where voltage reversals occur; unsuitable for DC-biased rails. | Choose SMCJ43CA-M3/9AT only when protecting bidirectional data buses or transformer-isolated interfaces; avoid on unidirectional power rails. |
Compared with SMBJ43A-M3/57T, the SMCJ43A-M3/9AT offers superior thermal robustness and surge endurance for automotive and industrial power rails; compared with SMCJ43CA-M3/9AT, it provides optimized clamping for DC systems with defined polarity, eliminating unnecessary bidirectional leakage paths.
Availability
SMCJ43A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and OBD-II diagnostic hardware requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMCJ43A-M3/9AT 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting 12 V, 24 V, and 48 V automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum clamping voltage of the SMCJ43A-M3/9AT under full-rated surge current?
The SMCJ43A-M3/9AT clamps to a maximum of 69.4 V when subjected to its rated 21.6 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. Designers must ensure downstream components tolerate this clamped voltage, especially in 48 V systems where margin above VWM is limited. The SMCJ43A-M3/9AT achieves this performance using a low-resistance silicon junction and optimized package thermal path.
Is the SMCJ43A-M3/9AT qualified to AEC-Q101 for automotive use?
The SMCJ43A-M3/9AT itself is not AEC-Q101 qualified; however, the SMCJ43A-HM3/9AT variant (with HM3 suffix) carries full AEC-Q101 qualification. The M3 suffix denotes halogen-free, RoHS-compliant construction but does not imply automotive qualification. For automotive designs requiring AEC-Q101, specify HM3-suffixed versions. The SMCJ43A-M3/9AT remains suitable for industrial and telecom applications where AEC-Q101 is not mandated, and its thermal and surge specs match the qualified variants.
How does the SMCJ43A-M3/9AT differ from the SMCJ43CA-M3/9AT?
The SMCJ43A-M3/9AT is unidirectional with a cathode band marking and conducts only during positive transients relative to its anode; the SMCJ43CA-M3/9AT is bidirectional, with symmetric breakdown and clamping in both polarities and no polarity marking. Both share identical VWM (43 V), VBR (47.8–52.8 V), and PPPM (1500 W), but the CA version is required for AC-coupled or floating lines like CAN or RS-485. Using SMCJ43A-M3/9AT on such lines risks failure during negative transients. Always match polarity type to circuit topology.
What is the recommended PCB layout for optimal thermal performance of the SMCJ43A-M3/9AT?
Vishay specifies mounting the SMCJ43A-M3/9AT on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve the rated RθJA = 75 °C/W and sustain 6.5 W power dissipation at TA = 50 °C. Thermal vias under each pad (minimum 4× 0.3 mm diameter, filled or tented) connected to inner-layer ground planes further reduce junction temperature. Avoid narrow traces between pads and minimize dielectric thickness beneath pads. The SMCJ43A-M3/9AT's SMC package relies on copper area-not just trace width-for heat spreading.
Does the SMCJ43A-M3/9AT meet UL 497B for telecom protector classification?
Yes - the SMCJ43A-M3/9AT carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766. This applies to both unidirectional and bidirectional variants in the SMCJ family. UL 497B certification validates its suitability for primary protection in telecom central office and customer premises equipment, including surge immunity testing per UL 1449 Third Edition. The SMCJ43A-M3/9AT's 1500 W rating and low clamping voltage directly support this classification, and no additional external components are required to meet the standard.
SMCJ43A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 21.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ43A-M3/9AT FAQ
1.How can I place an order for SMCJ43A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43A-M3/9AT 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 SMCJ43A-M3/9AT reliable?
The price and inventory of SMCJ43A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ43A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43A-M3/9AT?
SMCJ43A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43A-M3/9AT 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 SMCJ43A-M3/9AT?
For technical support, including SMCJ43A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ43A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ43A-M3/9AT 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 SMCJ43A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ43A-M3/9AT?
All SMCJ43A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43A-M3/9AT, 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 SMCJ43A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ43A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43A-M3/9AT Tags
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