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Vishay General Semiconductor - Diodes Division SMAJ43CA-M3/5A
- Part No.:
- SMAJ43CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CA-M3/5A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,704
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Product details
Overview
SMAJ43CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ43CA-M3/5A datasheet, SMAJ43CA-M3/5A pinout, SMAJ43CA-M3/5A application, or SMAJ43CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on PCBs requiring robust ESD and surge immunity per IEC 61000-4-2/4-5.
Technical Context
This device operates as a voltage-clamping protector: during overvoltage events exceeding VWM = 43 V, it avalanches to limit transient voltage to ≤69.4 V at 5.8 A, protecting downstream circuitry. Its bidirectional symmetry ensures identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Constructed with glass-passivated silicon junction and housed in an SMA (DO-214AC) package, SMAJ43CA-M3/5A delivers low incremental surge resistance and sub-nanosecond response time. It meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak, with thermal resistance RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–48 V nominal systems. |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown range ensures reliable turn-on across process variation and temperature. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamping voltage under 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capacity; enables protection against 1 kV/500 A lightning-induced surges per IEC 61000-4-5. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports high-energy fault clearing in power rails. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard SMT pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable. Device has two terminals: Anode and Cathode, electrically identical in CA variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts surge current in either polarity; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current exit point (bidirectional) | Completes clamping path to ground or reference rail; same electrical function as Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and floating sensors without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) when paired with appropriate PCB layout and grounding. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for automotive and industrial OEMs; certified per JESD201 Class 2 whisker resistance. |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and enables standard lead-free reflow processes without baking or special handling. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected CMOS/MOSFET circuits. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power distribution networks in engine control units (ECUs) and body electronics from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between power rail and chassis ground to shunt >100 V transients within nanoseconds. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤69.4 V, preventing permanent damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding analog and digital outputs of pressure, temperature, and position sensors connected to PLCs or data acquisition modules. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on sensor signal lines (e.g., 4–20 mA loop or 0–10 V output) referenced to system ground. Use Value: Maintains signal integrity during ESD events (IEC 61000-4-2 ±8 kV contact) and prevents false readings or sensor latch-up. |
| RS-485 Transceiver Port Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding full-duplex RS-485 transceivers (e.g., MAX13487, SN65HVD72) in building automation and smart metering systems. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across differential pair (A/B) and to ground, absorbing common-mode surges induced by nearby AC wiring. Use Value: Ensures transceiver survival under IEC 61000-4-5 2 kV surge tests while preserving signal rise/fall times due to low junction capacitance (~200 pF at 0 V). |
Use Scenario: Guarding H-bridge gate drivers and current sense amplifiers in washing machine, HVAC, and power tool motor control boards. IC Role / Device Role / Timing Role: Clamping inductive kickback from brushed DC or BLDC motors during PWM commutation and emergency stop. Use Value: Absorbs 400 W surge energy without degradation, enabling repeated motor start/stop cycles while maintaining long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (not halogen-free). | Approved for commercial-grade use only; not qualified for automotive environments requiring halogen-free materials. | Select when halogen-free requirement is not mandated and cost optimization is prioritized. |
| SMAJ43CAHM3_A/I | Identical electrical and mechanical specs; AEC-Q101 qualified variant with 13" tape-and-reel packaging (7500 pcs). | Required for automotive OEM designs needing qualification evidence and extended traceability (lot/date code + revision "A"/"I"). | Choose for Tier 1 automotive programs where AEC-Q101 documentation and production continuity are mandatory. |
Compared with SMAJ43CA-M3/5A, the E3 variant lacks halogen-free certification but offers lower unit cost, while the HM3_A/I version adds AEC-Q101 qualification and larger reel size - making SMAJ43CA-M3/5A the optimal balance of environmental compliance, industrial reliability, and standard packaging for non-automotive high-volume production.
Availability
SMAJ43CA-M3/5A is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, RS-485 transceiver port hardening, and consumer appliance motor drive protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ43CA-M3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and ruggedized packaging.
The SMAJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability under thermal cycling are critical.
FAQ
What is the clamping voltage of SMAJ43CA-M3/5A at its rated peak pulse current?
The SMAJ43CA-M3/5A has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ43CA-M3/5A maintains this clamping performance across its specified operating temperature range of -55 °C to +150 °C.
Is SMAJ43CA-M3/5A suitable for automotive applications?
SMAJ43CA-M3/5A is halogen-free and RoHS-compliant but not AEC-Q101 qualified. It is approved for industrial and commercial automotive subsystems (e.g., infotainment, lighting, HVAC controls) where qualification is not mandated. For safety-critical or powertrain ECUs requiring AEC-Q101, the SMAJ43CAHM3_A/I variant must be selected instead. The SMAJ43CA-M3/5A retains full electrical equivalence and thermal robustness required for under-dash environments.
How does the bidirectional design of SMAJ43CA-M3/5A affect PCB layout?
The bidirectional nature of SMAJ43CA-M3/5A eliminates polarity marking and allows symmetric placement across differential lines or AC-coupled nodes - simplifying layout and reducing assembly errors. No cathode band orientation check is needed, and routing can treat both terminals identically. This is especially beneficial for RS-485, CAN FD, and audio line protection where signal inversion or floating references are common. The SMAJ43CA-M3/5A requires only two mounting pads with no silkscreen polarity indicators.
What is the thermal resistance of SMAJ43CA-M3/5A, and how does it impact power dissipation?
SMAJ43CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. At its rated 3.3 W steady-state power dissipation (PD), this yields a ~400 °C temperature rise - confirming that PD applies only to continuous DC conditions, not transient events. During actual surge suppression, energy is absorbed capacitively and dissipated in microseconds, so thermal limits are governed by peak pulse rating (400 W), not PD.
Does SMAJ43CA-M3/5A meet industry surge immunity standards?
Yes - SMAJ43CA-M3/5A supports compliance with IEC 61000-4-2 (ESD ±8 kV contact), IEC 61000-4-4 (EFT 2 kV), and IEC 61000-4-5 (surge 1 kV line-earth, 2 kV line-line) when implemented with proper PCB layout: short traces, low-inductance ground plane, and direct connection to protected node and ground. Its 400 W peak pulse power and 69.4 V clamping voltage enable robust protection margins in these test configurations. The SMAJ43CA-M3/5A itself is not certified to these standards, but its parameters are validated for use in compliant designs.
SMAJ43CA-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 5.8A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ43CA-M3/5A FAQ
1.How can I place an order for SMAJ43CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CA-M3/5A 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 SMAJ43CA-M3/5A reliable?
The price and inventory of SMAJ43CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CA-M3/5A?
SMAJ43CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CA-M3/5A 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 SMAJ43CA-M3/5A?
For technical support, including SMAJ43CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ43CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43CA-M3/5A 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 SMAJ43CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43CA-M3/5A?
All SMAJ43CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CA-M3/5A, 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 SMAJ43CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ43CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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