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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SMAJ54A-E3/5A

Name: SMAJ54A-E3/5A
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ54A-E3/5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ54A-E3/5A

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ54A-E3/5A.pdf

Description:: TVS DIODE 54VWM 87.1VC DO214AC

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Product details

Overview

SMAJ54A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 54 V standoff voltage (V_WM), 60.0–66.3 V breakdown range (V_BR at 1 mA), 87.1 V maximum clamping voltage (V_C) at 4.6 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive ECUs.

For engineers reviewing the SMAJ54A-E3/5A datasheet, SMAJ54A-E3/5A pinout, SMAJ54A-E3/5A application, or SMAJ54A-E3/5A equivalent, key selection criteria include its unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification eligibility (via HE3/HM3 variants), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.

Technical Context

This TVS diode operates as a fast-acting shunt clamp during voltage transients, diverting surge energy away from downstream circuitry before damage occurs. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at V_WM) and low incremental surge resistance, enabling consistent clamping under repetitive 0.01% duty cycle surges.

The device responds in sub-nanosecond time to transients induced by inductive load switching or ESD events, with clamping action defined by its 87.1 V V_C at 4.6 A IPPM and 0.104 %/°C temperature coefficient of V_BR. It is rated for operation from −55 °C to +150 °C and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	54 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for protected circuitry.
V_BR (min/max)	60.0 V / 66.3 V at 1 mA - Verified breakdown threshold range; ensures reliable triggering above system nominal voltage.
V_C @ I_PPM	87.1 V at 4.6 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET.
P_PPM	400 W - Peak pulse power handling capability; supports high-energy transients without failure when mounted per recommended pad layout.
I_FSM	40 A - 8.3 ms half-sine surge current rating (unidirectional only); validates robustness against inrush or fault currents.
T_J max.	+150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments.
R_θJA	120 °C/W - Thermal resistance junction-to-ambient; informs PCB thermal design requirements for sustained power dissipation.

Pinout & Package

Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; anode is unmarked end.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry (unidirectional)	Connected to lower-potential side of protected line; conducts during forward surge or bias conditions.
Cathode	Reverse-biased terminal (marked with band)	Connected to higher-potential side (e.g., V_CC rail or signal line); initiates clamping when reverse voltage exceeds V_BR.

Key Features

Feature	Design Value
400 W peak pulse power (10/1000 μs)	Enables protection against high-energy transients common in automotive load-dump and industrial motor switching events.
87.1 V clamping voltage at 4.6 A	Limits voltage overshoot across protected components to within safe SOA margins for 5V–48V logic and power stages.
Glass passivated junction	Ensures long-term stability of leakage current (<1.0 μA) and breakdown parameters across temperature and lifetime.
MSL Level 1, 260 °C peak reflow	Supports standard lead-free SMT assembly without moisture-related popcorning or delamination risks.
AEC-Q101 qualification path	Available via HE3/HM3 suffix variants; satisfies reliability requirements for automotive powertrain and body electronics.

Applications

Automotive Power Distribution	Industrial Sensor Signal Protection
Use Scenario: Protecting 12 V/24 V power rails in engine control units and body control modules from load-dump transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between V_BAT and ground, triggered within <1 ns to clamp spikes to ≤87.1 V. Use Value: Prevents latch-up or gate oxide rupture in MCU power regulators and CAN transceivers during alternator disconnection events.	Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in pressure or temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, absorbing ±8 kV HBM ESD pulses without signal distortion. Use Value: Maintains measurement accuracy and prevents microcontroller reset by limiting transient-induced common-mode noise on precision ADC inputs.
Consumer Power Adapter Input Stage	Telecom DC-DC Converter Protection
Use Scenario: Safeguarding primary-side rectifier and controller ICs in offline AC-DC adapters subjected to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Fast-response TVS placed across bulk capacitor input, clamping line-to-ground transients before they reach PWM controller. Use Value: Extends product lifetime by eliminating repeated overstress failures in SMPS controllers and MOSFETs during brownout recovery.	Use Scenario: Protecting isolated DC-DC converter inputs in telecom base station power modules from coupling transients on backplane power buses. IC Role / Device Role / Timing Role: Unidirectional TVS installed at converter input filter stage, activated only during positive-going surges on +48 V supply rail. Use Value: Avoids false triggering of undervoltage lockout while ensuring immunity to 100 V/1 μs ringwave transients per IEC 61000-4-5.

Automotive Power Distribution

Industrial Sensor Signal Protection

Use Scenario: Protecting 12 V/24 V power rails in engine control units and body control modules from load-dump transients up to ISO 7637-2 Pulse 5a.

IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between V_BAT and ground, triggered within <1 ns to clamp spikes to ≤87.1 V.

Use Value: Prevents latch-up or gate oxide rupture in MCU power regulators and CAN transceivers during alternator disconnection events.

Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in pressure or temperature sensors exposed to ESD and cable discharge events.

IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, absorbing ±8 kV HBM ESD pulses without signal distortion.

Use Value: Maintains measurement accuracy and prevents microcontroller reset by limiting transient-induced common-mode noise on precision ADC inputs.

Consumer Power Adapter Input Stage

Telecom DC-DC Converter Protection

Use Scenario: Safeguarding primary-side rectifier and controller ICs in offline AC-DC adapters subjected to lightning-induced surges on mains input.

IC Role / Device Role / Timing Role: Fast-response TVS placed across bulk capacitor input, clamping line-to-ground transients before they reach PWM controller.

Use Value: Extends product lifetime by eliminating repeated overstress failures in SMPS controllers and MOSFETs during brownout recovery.

Use Scenario: Protecting isolated DC-DC converter inputs in telecom base station power modules from coupling transients on backplane power buses.

IC Role / Device Role / Timing Role: Unidirectional TVS installed at converter input filter stage, activated only during positive-going surges on +48 V supply rail.

Use Value: Avoids false triggering of undervoltage lockout while ensuring immunity to 100 V/1 μs ringwave transients per IEC 61000-4-5.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ54A-M3/5A	Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and clamping performance.	No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy.	Choose SMAJ54A-M3/5A when material declarations require halogen-free status without altering board layout or BOM validation.
SMAJ54AHE3_A/I	AEC-Q101 qualified version with enhanced reliability testing (HTOL, TC, UHAST); identical V_WM, V_BR, V_C, and P_PPM.	Required for automotive safety-critical modules (ASIL-B compatible systems); not suitable for commercial-only designs due to cost and qualification overhead.	Select SMAJ54AHE3_A/I only for automotive applications requiring formal AEC-Q101 certification and traceable lot-level reliability data.

Compared with SMAJ54A-M3/5A and SMAJ54AHE3_A/I, the SMAJ54A-E3/5A offers standard commercial-grade RoHS compliance and full electrical equivalence, making it optimal for industrial, telecom, and consumer applications where halogen-free or automotive qualification are not required-reducing cost and simplifying procurement without compromising protection performance.

Availability

SMAJ54A-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom power supply designs requiring stable component supply, tape-and-reel delivery, and long-term lifecycle support.

Supply support for SMAJ54A-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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability, high-efficiency solutions.

The SMAJ series is engineered specifically for transient voltage suppression in harsh electromagnetic environments, targeting automotive, industrial, and communications infrastructure where robustness against ESD, EFT, and surge events is mission-critical.

FAQ

What is the maximum clamping voltage of the SMAJ54A-E3/5A under a 10/1000 μs surge?

The SMAJ54A-E3/5A has a maximum clamping voltage (V_C) of 87.1 V when subjected to its rated peak pulse current of 4.6 A using the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and verified at T_A = 25 °C on 0.2" × 0.2" copper pads. The SMAJ54A-E3/5A maintains this clamping performance across its operational temperature range, ensuring predictable protection behavior in real-world surge events.

Is the SMAJ54A-E3/5A suitable for automotive applications?

The SMAJ54A-E3/5A itself is a commercial-grade part and not AEC-Q101 qualified; however, it shares identical electrical characteristics and package with the AEC-Q101-qualified variant SMAJ54AHE3_A/I. For non-safety-critical automotive subsystems (e.g., infotainment power rails), the SMAJ54A-E3/5A may be used subject to internal qualification-but for ASIL-compliant designs, the HE3-suffixed version must be specified. The SMAJ54A-E3/5A remains fully compatible with automotive PCB layouts and reflow profiles.

What does the "E3/5A" suffix indicate in SMAJ54A-E3/5A?

The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "/5A" specifies packaging in 13-inch diameter plastic tape and reel containing 7500 units. This format supports high-volume SMT assembly and is distinct from the "/61" variant (7-inch reel, 1800 units). The SMAJ54A-E3/5A uses the same die and SMA (DO-214AC) package as all members of the SMAJ5.0A–SMAJ188A family, ensuring mechanical and thermal interchangeability.

How does the thermal resistance of SMAJ54A-E3/5A affect PCB layout?

The SMAJ54A-E3/5A has a typical junction-to-ambient thermal resistance (R_θJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. To maintain T_J ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks near the SMA pads. Increasing pad size or adding thermal vias reduces R_θJA; the SMAJ54A-E3/5A's R_θJL of 30 °C/W further emphasizes the importance of low-impedance thermal paths to internal ground planes.

Can SMAJ54A-E3/5A replace SMAJ48A or SMAJ60A in an existing design?

No-SMAJ54A-E3/5A is not a direct replacement for SMAJ48A (V_WM = 48 V) or SMAJ60A (V_WM = 60 V) due to its specific 54 V standoff voltage. Substituting alters the protection margin: using SMAJ54A-E3/5A where SMAJ48A was intended risks premature clamping during normal operation, while replacing SMAJ60A may leave circuits vulnerable to transients below 54 V. Always verify V_WM alignment with system operating voltage and tolerance bands before substituting any SMAJ54A-E3/5A variant.

SMAJ54A-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:: 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-E3/5A FAQ

1.How can I place an order for SMAJ54A-E3/5A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ54A-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 SMAJ54A-E3/5A reliable?

The price and inventory of SMAJ54A-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 SMAJ54A-E3/5A is usually 5 days.

3.What payment methods are accepted for SMAJ54A-E3/5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54A-E3/5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ54A-E3/5A?

SMAJ54A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ54A-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 SMAJ54A-E3/5A?

For technical support, including SMAJ54A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54A-E3/5A requirements.

6.How does Aetrix verify that SMAJ54A-E3/5A is sourced from the original manufacturer or authorized distributors?

All SMAJ54A-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 SMAJ54A-E3/5A meets industry standards.

7.What is the process for return or replacement of SMAJ54A-E3/5A?

All SMAJ54A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54A-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 SMAJ54A-E3/5A part is unused and in its original packaging.

Return procedure for SMAJ54A-E3/5A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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