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Vishay General Semiconductor - Diodes Division SMAJ54CA-E3/5A
- Part No.:
- SMAJ54CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54CA-E3/5A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ54CA-E3/5A 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 54 V standoff voltage (VWM), 60.0–66.3 V breakdown range (VBR), 87.1 V maximum clamping voltage (VC) at 4.6 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 SMAJ54CA-E3/5A datasheet, SMAJ54CA-E3/5A pinout, SMAJ54CA-E3/5A application, or SMAJ54CA-E3/5A equivalent, this device delivers verified bidirectional surge suppression with AEC-Q101 qualification options, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and lightning transient protection.
Technical Context
The SMAJ54CA-E3/5A operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM), while thermal resistance (RθJA = 120 °C/W) supports operation up to +150 °C junction temperature.
It responds to transients in <1 ps, clamping within nanoseconds to limit overvoltage exposure to downstream components. The device meets UL 497B recognition (QVGQ2) and is rated for repetitive 0.01% duty cycle surges - validated under IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) stress profiles when applied with proper PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 48 V nominal systems. |
| VBR @ IT = 1 mA | 60.0–66.3 V - Breakdown voltage range ensuring reliable turn-on during overvoltage events with tight ±5% tolerance. |
| VC @ IPPM = 4.6 A | 87.1 V - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on 75 V-rated components. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; sufficient for Class 3B IEC 61000-4-5 surges. |
| IPPM | 4.6 A - Peak surge current supported at VC; enables protection of low-current analog/sensor lines and logic interfaces. |
| Junction Temp Range | –55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.0 mm × 5.0 mm copper pad thermal design; compatible with automated reflow assembly. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow). Bidirectional construction has no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles in bidirectional clamping; no cathode band marking; interchangeable in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485, CAN), and ungrounded power rails without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Supports robust immunity against induced lightning surges and inductive switching spikes in industrial and automotive environments. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during clamping - critical for safeguarding 60 V tolerant gate drivers and precision analog front-ends. |
| AEC-Q101 qualified option | Available with HE3/HM3 suffixes for automotive-grade reliability; validated for temperature cycling, HTRB, and mechanical shock per AEC standard. |
| MSL Level 1, 260 °C peak reflow | Eliminates bake-out requirements prior to SMT assembly; reduces manufacturing cost and avoids moisture-related popcorning failures. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting 5 V or 12 V analog sensor outputs (e.g., pressure, temperature) from load dump and alternator ripple in engine control modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamps both positive and negative transients on sensor signal lines before they reach ADC inputs or op-amp buffers. Use Value: Prevents latch-up or permanent damage to microcontroller analog peripherals while maintaining signal integrity below 87.1 V during 4.6 A surges. |
Use Scenario: Shielding digital input/output channels of programmable logic controllers from EFT bursts and relay coil flyback in factory automation cabinets. IC Role / Device Role / Timing Role: Fast-response TVS absorbs 10/1000 μs surges induced by nearby contactor switching, limiting voltage excursion across optocoupler or level-shifter inputs. Use Value: Ensures >100,000-cycle reliability of I/O isolation barriers by clamping transients within 1 ns, avoiding false triggering or insulation degradation. |
| Telecom Line Interface Protection | Consumer Power Adapter ESD Guard |
|
Use Scenario: Safeguarding Ethernet PHY or PoE interface circuits from induced surges on twisted-pair cabling in outdoor network switches. IC Role / Device Role / Timing Role: Placed across differential pairs (e.g., TX+/TX–) to clamp common-mode and differential-mode transients simultaneously. Use Value: Maintains IEEE 802.3 compliance by limiting surge-induced common-mode voltage to <90 V, preventing PHY reset or transformer saturation. |
Use Scenario: Adding secondary-side surge protection on 5 V/9 V USB-C power delivery rails in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS shunts ESD strikes (IEC 61000-4-2 ±8 kV contact) away from USB PD controller and port multiplexer. Use Value: Achieves pass/fail compliance without degrading signal rise time due to <50 pF typical junction capacitance at VR = 0 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-E3/5A | Unidirectional version; same VWM, VBR, VC, and PPPM, but requires correct polarity placement and cannot protect AC signals. | Restricted to DC-biased lines where polarity is fixed (e.g., 54 V supply rail); unsuitable for differential or floating interfaces. | Select only if system ground reference is stable and signal polarity is guaranteed; otherwise prefer SMAJ54CA-E3/5A for flexibility. |
| SMBJ54CA-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 1.5× higher thermal mass and RθJA = 80 °C/W vs. 120 °C/W. | Better power dissipation under sustained surge conditions; requires larger PCB footprint (4.6 mm × 3.9 mm vs. 4.9 mm × 3.9 mm). | Choose SMBJ54CA-E3/52 when thermal derating is critical in high-ambient environments (>85 °C); SMAJ54CA-E3/5A preferred for space-constrained layouts. |
Compared with SMAJ54A-E3/5A and SMBJ54CA-E3/52, the SMAJ54CA-E3/5A uniquely balances bidirectional functionality, compact SMA footprint, and verified AEC-Q101 compatibility - making it optimal for automotive body electronics and miniaturized industrial sensors where polarity-agnostic protection and board area are jointly constrained.
Availability
SMAJ54CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer power adapter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ54CA-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 performance.
The SMAJ series was developed for board-level transient protection in harsh environments - targeting automotive, industrial, and telecom applications where fast response, repeatable clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ54CA-E3/5A at its rated peak pulse current?
The SMAJ54CA-E3/5A has a maximum clamping voltage (VC) of 87.1 V at 4.6 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that protected circuitry will not experience voltages exceeding 87.1 V during defined surge events - a key parameter for validating safety margins in 54 V system designs.
Is SMAJ54CA-E3/5A suitable for automotive applications?
Yes, SMAJ54CA-E3/5A is RoHS-compliant and offered in AEC-Q101 qualified variants (e.g., SMAJ54CAHE3_A/I). While the base part number SMAJ54CA-E3/5A itself is commercial grade, its construction - including glass-passivated junction, –55 °C to +150 °C operating range, and MSL Level 1 rating - aligns with automotive environmental requirements. For certified use, specify the HE3 or HM3 suffix variant.
How does SMAJ54CA-E3/5A differ from unidirectional SMAJ54A-E3/5A?
The SMAJ54CA-E3/5A is bidirectional with symmetrical clamping in both polarities and no cathode marking, whereas SMAJ54A-E3/5A is unidirectional with a cathode band and only clamps in reverse bias. Both share identical VWM (54 V), VBR (60.0–66.3 V), and VC (87.1 V), but SMAJ54CA-E3/5A supports AC-coupled or floating signal lines - essential for RS-485, CAN, and audio interfaces where polarity isn't fixed.
What is the maximum reverse leakage current for SMAJ54CA-E3/5A at its standoff voltage?
At VWM = 54 V and TA = 25 °C, the SMAJ54CA-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage ensures minimal power loss and signal distortion in high-impedance sensor or communication circuits - critical for battery-powered devices and precision analog measurement paths.
Does SMAJ54CA-E3/5A require special PCB layout considerations?
Yes - to achieve rated 400 W pulse power, SMAJ54CA-E3/5A must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's recommended layout. Short, wide traces reduce inductance and improve clamping response; ground plane connection should be direct and low-impedance. Avoid thermal reliefs on pads to maintain effective heat dissipation during surge events.
SMAJ54CA-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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SMAJ54CA-E3/5A FAQ
1.How can I place an order for SMAJ54CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54CA-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 SMAJ54CA-E3/5A reliable?
The price and inventory of SMAJ54CA-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 SMAJ54CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ54CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54CA-E3/5A?
SMAJ54CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54CA-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 SMAJ54CA-E3/5A?
For technical support, including SMAJ54CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ54CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ54CA-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 SMAJ54CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ54CA-E3/5A?
All SMAJ54CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54CA-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 SMAJ54CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ54CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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