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Vishay General Semiconductor - Diodes Division SMAJ54A-E3/61
- Part No.:
- SMAJ54A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54A-E3/61.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,473
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Product details
Overview
SMAJ54A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 54 V standoff voltage (VWM), 60.0–66.3 V breakdown voltage (VBR) at 1 mA, 87.1 V maximum clamping voltage (VC) at 4.6 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive infotainment power supplies and industrial sensor interface circuits.
For engineers reviewing the SMAJ54A-E3/61 datasheet, SMAJ54A-E3/61 pinout, SMAJ54A-E3/61 application, or SMAJ54A-E3/61 equivalent, key selection criteria include clamping performance under 4.6 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, AEC-Q101 qualification eligibility, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a shunt-clamping device that remains high-impedance below 54 V and rapidly transitions to low-impedance conduction above its 60.0–66.3 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable avalanche behavior across temperature (−55 °C to +150 °C).
The SMAJ54A-E3/61 delivers 400 W peak pulse power handling per 10/1000 μs waveform when mounted on standard 5.0 mm × 5.0 mm copper pads, with clamping voltage tightly controlled at 87.1 V - enabling robust protection of 48 V nominal systems against ISO 7637-2 pulse 1, 2a, and 5a transients without overstressing downstream MOSFETs or regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit for protected circuit's normal DC rail. |
| VBR min/max | 60.0 V / 66.3 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system overvoltage thresholds. |
| VC @ IPPM | 87.1 V at 4.6 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak transient energy absorption capability; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) compliance with proper layout. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; requires minimum 5.0 mm × 5.0 mm copper pad per terminal for rated power derating. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables tolerance of brief reverse-polarity misconnections. |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current until breakdown, ideal for DC supply line protection. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected circuit's ground or low-side return path; must be routed with low-inductance trace. |
| Cathode | Avalanche conduction node | Marked by black band; connects to protected line (e.g., 48 V rail); carries full surge current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe automotive load-dump and inductive switching transients without external series impedance. |
| 87.1 V clamping at 4.6 A | Keeps protected 48 V systems within safe operating area of common DC-DC controllers (e.g., LM5069, TPS40400) during surge events. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1.0 μA) over 15-year field life, critical for battery-backed industrial sensors. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without popcorn cracking or parameter shift; eliminates pre-bake requirements in high-volume SMT lines. |
| AEC-Q101 qualification option | Base P/NHE3 variant available for automotive applications requiring validated reliability per JESD22-A108 and A114 standards. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 48 V battery-fed ADAS camera modules from load-dump transients (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed directly across input capacitor of PMIC, triggered within <1 ns to clamp voltage spikes. Use Value: Limits rail excursion to ≤87.1 V, preventing latch-up or gate oxide damage in buck controllers and image signal processors. | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLC I/O modules exposed to motor drive noise and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC line upstream of transceiver, absorbing coupled surges before they reach internal LDOs. Use Value: Maintains <1.0 μA leakage at 54 V, avoiding false triggering or bias current errors in precision analog front-ends. |
| Telecom DC Power Input | Consumer USB-C PD Adapter |
Use Scenario: Secondary-side overvoltage suppression in PoE-powered network switches after DC-DC conversion from 57 V phantom power. IC Role / Device Role / Timing Role: Standoff-rated TVS on 48 V output rail, activated only during fault conditions like transformer saturation or feedback loop failure. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), surviving accidental reverse-polarity connection during field maintenance. | Use Scenario: Input-stage transient protection in 100 W USB-C PD adapters where 48 V bus may experience hot-plug or cable discharge events. IC Role / Device Role / Timing Role: First-line defense between AC/DC rectifier and primary-side controller, clamping fast-rising ESD and ringwave transients. Use Value: 120 °C/W RθJA allows direct mounting on PCB without heatsink while sustaining 3.3 W steady-state dissipation at 50 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and package; same thermal and clamping performance. | No functional difference; selected when halogen-free BOM compliance is required per IPC-1752A. | Choose SMAJ54A-M3/61 for green manufacturing programs requiring halogen-free materials without sacrificing protection margin. |
| SMAJ54CA-E3/61 | Bidirectional version with symmetric 54 V standoff and same 87.1 V clamping, but dual avalanche paths increase junction capacitance (~100 pF vs. ~50 pF). | Suitable for AC-coupled or floating signal lines (e.g., CAN bus, audio), not DC rails with defined polarity. | Select SMAJ54CA-E3/61 only for bidirectional signal protection; avoid on polarized DC supplies due to higher leakage and capacitance. |
Compared with SMAJ54A-M3/61, the SMAJ54A-E3/61 offers identical protection performance with standard RoHS compliance, while SMAJ54CA-E3/61 trades unidirectional efficiency for symmetrical clamping - making the original SMAJ54A-E3/61 optimal for cost-sensitive, high-volume 48 V DC rail protection where polarity is fixed and layout space is constrained.
Availability
SMAJ54A-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom DC inputs, and consumer USB-C PD adapter designs requiring stable component supply and full traceability.
Supply support for SMAJ54A-E3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where immunity to load dump, ESD, and lightning-induced surges is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ54A-E3/61 under standardized surge conditions?
The SMAJ54A-E3/61 exhibits a maximum clamping voltage (VC) of 87.1 V when subjected to its rated 4.6 A peak pulse current (IPPM) using the 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Does the SMAJ54A-E3/61 meet automotive reliability standards?
The base SMAJ54A-E3/61 is commercial-grade and RoHS-compliant, but Vishay offers the AEC-Q101 qualified variant SMAJ54AHE3_A/H. That part undergoes extended stress testing per JESD22-A108 (temperature cycling), JESD22-A114 (ESD), and JESD22-A104 (highly accelerated stress test), making it suitable for automotive powertrain and body electronics where qualification is mandatory.
How does the SMAJ54A-E3/61 differ from bidirectional TVS diodes like SMAJ54CA-E3/61?
The SMAJ54A-E3/61 is unidirectional with cathode marking and optimized for DC rail protection, offering lower leakage (<1.0 μA at 54 V) and reduced junction capacitance (~50 pF). In contrast, SMAJ54CA-E3/61 provides symmetrical clamping for AC or floating nodes but doubles leakage and increases capacitance - making SMAJ54A-E3/61 preferable for polarized 48 V systems where signal integrity and standby power matter.
What PCB layout practices maximize the surge-handling capability of the SMAJ54A-E3/61?
To achieve the rated 400 W peak pulse power, the SMAJ54A-E3/61 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, with short, wide traces to minimize inductance. Thermal vias under pads improve heat dissipation, and grounding both pads to inner-layer planes reduces clamping impedance - all essential to maintain 87.1 V VC during real-world transients.
Is the SMAJ54A-E3/61 compatible with lead-free reflow processes?
Yes, the SMAJ54A-E3/61 meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, enabling direct use in Pb-free SAC305 solder profiles without pre-baking or special handling - verified across thousands of production runs in automotive module assembly lines.
SMAJ54A-E3/61 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ54A-E3/61 FAQ
1.How can I place an order for SMAJ54A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54A-E3/61 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 SMAJ54A-E3/61 reliable?
The price and inventory of SMAJ54A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ54A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54A-E3/61?
SMAJ54A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54A-E3/61 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 SMAJ54A-E3/61?
For technical support, including SMAJ54A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54A-E3/61 requirements.
6.How does Aetrix verify that SMAJ54A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ54A-E3/61 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 SMAJ54A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ54A-E3/61?
All SMAJ54A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54A-E3/61, 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 SMAJ54A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ54A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ54A-E3/61 Tags
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