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Vishay General Semiconductor - Diodes Division SMAJ43CA-E3/5A
- Part No.:
- SMAJ43CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CA-E3/5A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,750
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Product details
Overview
SMAJ43CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 43 V standoff voltage (VWM), 47.8–52.8 V breakdown range (VBR at 1 mA), and clamps to ≤69.4 V at 5.8 A peak pulse current (IPPM) under 10/1000 μs waveform - used to protect MOSFETs, sensor interfaces, and automotive ECUs against ESD and load dump.
For engineers reviewing the SMAJ43CA-E3/5A datasheet, SMAJ43CA-E3/5A pinout, SMAJ43CA-E3/5A application, or SMAJ43CA-E3/5A equivalent, this device delivers verified bidirectional surge protection with AEC-Q101 qualification options, low clamping ratio (VC/VBR ≈ 1.37), and MSL Level 1 reflow compatibility - critical for automotive infotainment, industrial I/O modules, and telecom line-card designs requiring robust transient immunity.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 43 V), while the 120 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined PCB pad layout.
The device sustains 400 W peak pulse power (10/1000 μs) below 78 V and derates to 300 W above that threshold, with fast response time (<1 ns) and low incremental surge resistance - key for suppressing fast-rising transients from inductive switching or lightning-induced surges in 12 V/24 V automotive and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 36 V nominal systems. |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown range ensures reliable turn-on within spec across process variation and temperature. |
| VC @ IPPM | ≤69.4 V at 5.8 A - Clamping voltage limits stress on downstream ICs during 10/1000 μs surge events. |
| PPPM | 400 W - Peak pulse power rating enables suppression of high-energy transients common in automotive load-dump scenarios. |
| IFSM | 40 A - Surge current capability supports single half-sine 8.3 ms fault events in unidirectional variants; not applicable to bidirectional SMAJ43CA. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad requirement for thermal performance. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional types; meets UL 94 V-0 and J-STD-020 MSL Level 1 (260 °C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical junction; connects to protected line (e.g., CAN_H or RS-485 A); no cathode band marking. |
| Anode | Terminal B | Opposite terminal of symmetrical junction; connects to complementary line (e.g., CAN_L or RS-485 B); identical electrical role to Terminal A. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC or differential signals (e.g., CAN, RS-485) without external polarity management or dual-device placement. |
| 400 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V automotive systems when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage exposure to protected ICs - critical for 5 V or 3.3 V logic interfaces downstream of the TVS. |
| AEC-Q101 qualified option available | HE3/HM3 suffix variants meet automotive reliability standards for mission-critical applications including body control modules and ADAS sensors. |
| MSL Level 1 reflow compatibility | Supports standard SMT assembly without moisture sensitivity handling - reduces manufacturing complexity and cost. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in vehicle infotainment head units from load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits peak voltage to ≤69.4 V during 400 W transients, preventing latch-up or permanent damage to downstream 5 V logic ICs. |
Use Scenario: Shielding analog output lines of pressure sensors in factory automation PLC I/O modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across signal and return path to absorb ±8 kV contact ESD (IEC 61000-4-2) without signal distortion. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amps or ADC inputs are overstressed, preserving measurement integrity. |
| Telecom Data Line Protection | Consumer USB Port ESD Guard |
Use Scenario: Safeguarding RS-485 transceivers in base station remote radio units exposed to induced lightning surges on long outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across A/B lines to suppress common-mode transients while maintaining signal integrity. Use Value: Symmetrical clamping (VC = 69.4 V in either direction) prevents data corruption during 10/1000 μs surges up to 5.8 A. |
Use Scenario: Adding secondary ESD protection on USB 2.0 D+/D− lines in smart home hubs after primary protection at connector. IC Role / Device Role / Timing Role: Low-capacitance (typ. <50 pF) bidirectional TVS shunting transient energy to ground without degrading 480 Mbps signal rise time. Use Value: Meets IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) while adding <0.5 pF parasitic capacitance per line - negligible impact on eye diagram. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/5A | Unidirectional variant; cathode band marked; same VWM, VBR, VC, and PPPM specs but asymmetric conduction. | Required only for DC-biased lines where reverse conduction must be blocked (e.g., 5 V supply rail with ground reference). | Select SMAJ43A-E3/5A when protecting unidirectional power rails; SMAJ43CA-E3/5A is mandatory for AC or differential signal paths. |
| SMBJ43CA-T | Same electrical specs but in SMB (DO-214AA) package - 30 % larger footprint, lower RθJA (90 °C/W), higher IPPM (6.5 A). | Better thermal performance and surge margin; suitable for high-reliability industrial designs with space allowance. | Choose SMBJ43CA-T if board layout permits larger package and higher surge endurance is required; SMAJ43CA-E3/5A fits tighter spaces with proven automotive fit. |
Compared with SMAJ43A-E3/5A, SMAJ43CA-E3/5A provides symmetrical clamping essential for differential signaling, while SMBJ43CA-T offers superior thermal dissipation and surge current handling at the cost of PCB area - making SMAJ43CA-E3/5A the optimal balance of size, performance, and bidirectional capability for space-constrained automotive and industrial edge nodes.
Availability
SMAJ43CA-E3/5A is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, telecom data line protection, and consumer USB interface hardening requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ43CA-E3/5A 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, efficiency, and application-specific optimization.
The SMAJ series was developed for high-speed, high-energy transient suppression in automotive, industrial, and communications equipment - delivering consistent clamping performance in compact surface-mount packages with AEC-Q101 qualification support.
FAQ
What is the maximum clamping voltage of the SMAJ43CA-E3/5A under a 10/1000 μs surge?
The SMAJ43CA-E3/5A clamps to a maximum of 69.4 V at its rated peak pulse current of 5.8 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and reflects worst-case voltage seen by downstream circuitry during transient events - critical for ensuring compatibility with 5 V or 3.3 V ICs in protected systems.
Is the SMAJ43CA-E3/5A suitable for automotive applications?
Yes - the SMAJ43CA-E3/5A is RoHS-compliant and offered in AEC-Q101 qualified versions (e.g., SMAJ43CAHE3_A/I). Even the standard E3/5A variant meets key automotive transient immunity requirements including ISO 7637-2 Pulse 5a when mounted per Vishay's recommended 5.0 mm × 5.0 mm copper pad layout, making it widely deployed in body control modules and infotainment power supplies.
How does the bidirectional design of SMAJ43CA-E3/5A affect its use in differential signal lines?
The bidirectional architecture of SMAJ43CA-E3/5A allows identical clamping behavior regardless of voltage polarity - essential for protecting differential pairs like CAN, RS-485, or LVDS where transients may appear as common-mode spikes across both lines. Unlike unidirectional TVS diodes, SMAJ43CA-E3/5A requires no orientation alignment and avoids unintended forward conduction during negative excursions.
What is the thermal resistance and maximum junction temperature rating for SMAJ43CA-E3/5A?
The SMAJ43CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Its maximum operating junction temperature is +150 °C, enabling reliable operation in under-hood automotive environments and sealed industrial enclosures with ambient temperatures up to +105 °C.
Does SMAJ43CA-E3/5A have polarity markings on the package?
No - SMAJ43CA-E3/5A is a bidirectional TVS diode and carries no cathode band or other polarity marking on the SMA (DO-214AC) package. Its symmetrical internal structure means both terminals are functionally identical, simplifying PCB layout and eliminating orientation errors during automated placement - unlike unidirectional variants such as SMAJ43A-E3/5A which feature a visible cathode band.
SMAJ43CA-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ43CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CA-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ43CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ43CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CA-E3/5A?
SMAJ43CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CA-E3/5A 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-E3/5A?
For technical support, including SMAJ43CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ43CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ43CA-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ43CA-E3/5A?
All SMAJ43CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CA-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ43CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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