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Vishay General Semiconductor - Diodes Division SMCJ43CA-E3/9AT
- Part No.:
- SMCJ43CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ43CA-E3/9AT.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,479
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Product details
Overview
SMCJ43CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V standoff voltage (VWM), 69.4 V maximum clamping voltage (VC) at 21.6 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs waveform), commonly deployed on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ43CA-E3/9AT datasheet, SMCJ43CA-E3/9AT pinout, SMCJ43CA-E3/9AT application, or SMCJ43CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJL = 15 °C/W), AEC-Q101 qualification readiness, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ43CA-E3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both directions due to its bidirectional construction. Its breakdown voltage (VBR) is specified at 47.8–52.8 V (min/max) with 1 mA test current, and it exhibits a temperature coefficient of VBR of +0.102 %/°C - critical for stable performance across automotive temperature ranges (−55 °C to +150 °C).
It meets J-STD-020 MSL Level 1 (peak reflow ≤ 260 °C), supports JEDEC-compliant solderability, and maintains <1.0 μA reverse leakage at VWM, ensuring minimal standby power impact in always-on systems such as CAN bus nodes or battery-backed sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin below system rail. |
| VC @ IPPM | 69.4 V - Clamped voltage during 10/1000 μs surge at 21.6 A; determines protected circuit's maximum transient exposure. |
| IPPM | 21.6 A - Peak surge current capability under standard waveform; sets minimum surge energy handling (1500 W). |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pad heat sinking without external heatsink. |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive and high-ambient industrial use. |
| Leakage @ VWM | <1.0 μA - Ultra-low reverse leakage ensures negligible quiescent current drain in battery-powered applications. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
SMCJ43CA-E3/9AT uses the SMC (DO-214AB) package: a surface-mount, bidirectional device with no polarity marking. The two terminals are electrically symmetric - neither anode nor cathode is designated - enabling identical connection in either direction across protected lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Line-side connection point | Connected to protected signal or power line; forms one half of symmetrical clamping path. |
| Terminal 2 | Line-side connection point | Connected to same reference (e.g., ground or complementary line); completes bidirectional clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates orientation concerns during layout and assembly. |
| Glass-passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; validated per JESD22-A110. |
| MSL Level 1 rating | Supports single-reflow assembly at 260 °C peak without preconditioning - reduces manufacturing complexity and cost. |
| AEC-Q101 readiness | E3 suffix indicates RoHS-compliant commercial grade; HE3 variant available for full automotive qualification. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = ~21.6 V) - improves protection margin for 3.3 V/5 V logic and analog front-ends. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver signal lines and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and chassis ground, responding within <1 ns to transients exceeding VWM. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers by limiting voltage to ≤69.4 V during 1500 W surges. | Use Scenario: Shielding digital input modules in programmable logic controllers from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across 24 V DC input terminals, absorbing repetitive 10/1000 μs surges up to 21.6 A. Use Value: Extends field lifetime by eliminating false triggering and component degradation caused by >1 kV transients. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Safeguarding Ethernet PHY interface pins and PoE detection circuitry against lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across data pairs (e.g., TX+/TX−), leveraging symmetrical clamping to preserve signal integrity. Use Value: Maintains <1 pF junction capacitance at zero bias - avoids signal distortion in 100BASE-TX and higher-speed links. | Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V/12 V USB-C PD adapter outputs exposed to hot-plug and cable fault conditions. IC Role / Device Role / Timing Role: Final-stage TVS connected between output rail and ground, activated only during abnormal overvoltage events (>43 V). Use Value: Limits fault voltage to 69.4 V, preventing downstream USB controller IC damage while maintaining <1 μA standby leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43CA | Lower PPPM (400 W), smaller SMA package, higher VC/VBR ratio (1.5×) | Suitable for space-constrained consumer ports but insufficient for 1500 W industrial surges | Select SMCJ43CA-E3/9AT when 1500 W surge immunity and thermal robustness are required. |
| 1.5KE43CA | Through-hole DO-201 package, identical VWM/VC, but RθJA = 100 °C/W (vs. 75 °C/W) | Requires larger board area and manual assembly; less suitable for high-volume SMT production | Choose SMCJ43CA-E3/9AT for automated manufacturing and improved thermal performance on PCB copper. |
Compared with SAC43CA and 1.5KE43CA, the SMCJ43CA-E3/9AT delivers superior surge handling (1500 W), lower thermal resistance (RθJL = 15 °C/W), and SMT process compatibility - making it optimal for automotive-grade and high-reliability industrial designs where board space, thermal management, and assembly efficiency are critical.
Availability
SMCJ43CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, consistent lot traceability, and long-term lifecycle support.
Supply support for SMCJ43CA-E3/9AT 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, precision, and automotive qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where failure tolerance and AEC-Q101 readiness are essential design requirements.
FAQ
What is the clamping voltage of SMCJ43CA-E3/9AT at its rated peak pulse current?
The SMCJ43CA-E3/9AT has a maximum clamping voltage (VC) of 69.4 V at its rated peak pulse current (IPPM) of 21.6 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88394). The SMCJ43CA-E3/9AT maintains this clamping performance bidirectionally, ensuring consistent protection regardless of surge polarity.
Is SMCJ43CA-E3/9AT suitable for automotive applications?
The SMCJ43CA-E3/9AT carries the E3 suffix, indicating RoHS-compliant commercial grade and MSL Level 1 qualification. While not AEC-Q101 certified itself, it shares the same die and construction as the AEC-Q101-qualified SMCJ43CAHE3 variant. Engineers may use the SMCJ43CA-E3/9AT in non-safety-critical automotive subsystems (e.g., body control modules) with appropriate validation; for full qualification, the HE3 version is recommended. The SMCJ43CA-E3/9AT operates from −55 °C to +150 °C and withstands 260 °C reflow, supporting under-hood deployment.
How does the bidirectional nature of SMCJ43CA-E3/9AT affect PCB layout?
The SMCJ43CA-E3/9AT has no polarity marking and identical electrical characteristics in both directions, so PCB layout requires no orientation alignment - either terminal may connect to the protected line or reference plane. This simplifies routing, eliminates assembly errors, and supports differential-mode placement across signal pairs. The SMCJ43CA-E3/9AT's DO-214AB package uses symmetric metallization, ensuring balanced surge current sharing and consistent clamping behavior regardless of mounting direction.
What is the thermal resistance from junction to lead (RθJL) for SMCJ43CA-E3/9AT?
The SMCJ43CA-E3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, as specified in Vishay's datasheet (Document Number: 88394, page 3). This low value enables efficient heat transfer directly from the silicon die to the PCB copper pads via the leads, reducing reliance on large thermal vias or external heatsinks. When mounted on 8.0 mm × 8.0 mm copper pads per terminal, the SMCJ43CA-E3/9AT sustains repeated surge events without thermal runaway - a key advantage over higher-RθJL alternatives.
Does SMCJ43CA-E3/9AT meet UL recognition standards?
Yes, the SMCJ43CA-E3/9AT is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for signal line protectors. This certification covers its use in telecommunications, industrial control, and automotive electronics where safety agency approval is mandated. The SMCJ43CA-E3/9AT's molding compound also meets UL 94 V-0 flammability rating, confirming flame-retardant performance during fault conditions.
SMCJ43CA-E3/9AT 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:
- -
- Bidirectional Channels:
- 1
- 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 (SMCJ)
SMCJ43CA-E3/9AT FAQ
1.How can I place an order for SMCJ43CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ43CA-E3/9AT 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 SMCJ43CA-E3/9AT reliable?
The price and inventory of SMCJ43CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ43CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ43CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ43CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ43CA-E3/9AT?
SMCJ43CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ43CA-E3/9AT 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 SMCJ43CA-E3/9AT?
For technical support, including SMCJ43CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ43CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ43CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ43CA-E3/9AT 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 SMCJ43CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ43CA-E3/9AT?
All SMCJ43CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ43CA-E3/9AT, 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 SMCJ43CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ43CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ43CA-E3/9AT Tags
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