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Vishay General Semiconductor - Diodes Division SMAJ58-E3/5A
- Part No.:
- SMAJ58-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58-E3/5A.pdf
- Description:
- TVS DIODE 58VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,214
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Product details
Overview
SMAJ58-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 58 V stand-off voltage (VWM), 64.4–78.7 V breakdown voltage (VBR at 1 mA), 103 V maximum clamping voltage (VC) at 3.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ58-E3/5A datasheet, SMAJ58-E3/5A pinout, SMAJ58-E3/5A application, or SMAJ58-E3/5A equivalent, this device serves as a robust overvoltage protection solution for DC power rails, automotive sensor interfaces, industrial I/O modules, and telecom line cards where fast response (<1 ps), low clamping ratio, and RoHS-compliant surface-mount reliability are required.
Technical Context
The SMAJ58-E3/5A operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5 % for A-suffix variants) and low leakage (<1 µA at VWM), while its low incremental surge resistance enables effective energy diversion during transient events.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020, with matte tin-plated leads solderable per J-STD-002 and JESD22-B102, and passes JESD201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC working margin. |
| VBR (min/max) | 64.4 V / 78.7 V at 1 mA - Confirmed breakdown range ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 103 V at 3.9 A - Clamping voltage under 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling capacity; supports repetitive transient suppression in industrial environments. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| Junction Temp Range | –55 °C to +150 °C - Enables deployment in under-hood automotive, factory-floor PLCs, and outdoor telecom enclosures. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-axis cathode-banded configuration. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), with 2.54 mm lead pitch and matte tin-plated terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side of protected line; determines polarity-specific clamping behavior. |
| Cathode (banded end) | Avalanche conduction terminal | Connected to higher-potential side (e.g., VCC rail); conducts during overvoltage to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables precise placement on DC supply rails or biased signal paths without affecting forward bias operation. |
| 400 W peak pulse power (10/1000 µs) | Provides sufficient energy absorption for IEC 61000-4-5 Level 3 surges (1 kV/42 Ω) on 24 V systems. |
| Clamping ratio (VC/VWM) ≈ 1.78 | Delivers tight voltage limiting-critical for protecting 60 V-rated MOSFETs or CAN transceivers with 70 V abs max. |
| MSL Level 1, 260 °C reflow compatible | Supports standard SMT assembly without preconditioning; eliminates moisture-related popcorning risk. |
| RoHS-compliant, JESD201 Class 1A whisker tested | Validates long-term interconnect reliability in high-vibration or high-humidity applications such as automotive body control modules. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground to clamp transients before reaching ADC front-end or microcontroller GPIO. Use Value: Limits induced voltage to ≤103 V during 100 V/50 ms load dump event, preserving signal integrity and preventing latch-up in 5 V or 3.3 V interface ICs. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and ESD from operator interaction. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side input circuit, positioned upstream of optocoupler or Schmitt trigger input stage. Use Value: Absorbs 400 W surge energy within <1 ns, maintaining input logic state fidelity and extending optocoupler lifetime by reducing voltage stress. |
| Telecom Line Card Protection | DC Power Rail Clamp |
Use Scenario: Secondary protection on -48 V telecom power feeds and data lines subject to lightning-induced surges per ITU-T K.20/K.44. IC Role / Device Role / Timing Role: Fast-acting clamping device in series with primary GDT or MOV, providing low-clamp backup for residual transients. Use Value: Achieves 103 V clamping at 3.9 A, ensuring downstream DC-DC converters and PMICs remain within absolute maximum ratings during multi-kV surge events. |
Use Scenario: Overvoltage suppression on 48 V intermediate bus in server PSUs or PoE injectors where MOSFET gate drivers require strict VDS limits. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor output to limit transient overshoot during hot-swap or load-step events. Use Value: Responds in <1 ps to suppress >60 V excursions to ≤103 V, preventing destructive avalanche in 100 V-rated power MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58A-E3/5A | Lower VBR range (64.4–71.2 V), tighter 5 % tolerance, 93.6 V clamping at 4.3 A. | Better suited for precision 58 V rail protection where lower clamping voltage is critical (e.g., protecting 100 V MOSFETs with narrow margin). | Select SMAJ58A-E3/5A when VC reduction outweighs need for higher surge current headroom. |
| SMBJ58A-E3/52 | DO-214AA (SMB) package, same electrical specs but 20 % larger footprint and 150 W higher PPPM (550 W). | Preferred for high-energy environments (e.g., railway signaling) where thermal mass and power derating margin are prioritized over board space. | Choose SMBJ58A-E3/52 if layout allows larger package and system-level surge testing requires >400 W capability. |
Compared with SMAJ58-E3/5A, the SMAJ58A-E3/5A offers lower clamping voltage at the cost of reduced peak surge current margin, while the SMBJ58A-E3/52 trades compactness for higher thermal robustness-making each optimal for distinct mechanical and electrical design constraints.
Availability
SMAJ58-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input conditioning, telecom line card surge suppression, and 48 V DC power rail clamping requiring stable component supply across extended production lifecycles.
Supply support for SMAJ58-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where fast response, repeatable clamping, and AEC-Q101 readiness (for HE3 variants) are essential.
FAQ
What is the maximum clamping voltage of the SMAJ58-E3/5A under standard test conditions?
The SMAJ58-E3/5A has a maximum clamping voltage (VC) of 103 V when subjected to its rated peak pulse current of 3.9 A using the 10/1000 µs waveform. This value is measured at TA = 25 °C on specified copper pad layouts and defines the upper voltage limit imposed on protected circuits during transient events.
Is the SMAJ58-E3/5A unidirectional or bidirectional, and how is polarity identified?
The SMAJ58-E3/5A is a unidirectional TVS diode. Polarity is indicated by a cathode band on the DO-214AC (SMA) package body-the banded end corresponds to the cathode terminal, which must be connected toward the higher-potential side of the protected line (e.g., VCC or signal source) for proper clamping operation.
Does the SMAJ58-E3/5A meet automotive qualification standards?
The base SMAJ58-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ58HE3/5A variant (with HE3 suffix), which is explicitly qualified to AEC-Q101 and rated for high-reliability use in engine control, body electronics, and ADAS subsystems.
What is the standoff voltage (VWM) and why is it critical for circuit design?
The SMAJ58-E3/5A has a standoff voltage (VWM) of 58 V-this is the maximum continuous reverse voltage the device can block without significant leakage (<1 µA). It must exceed the normal operating voltage of the protected line (e.g., 48 V DC bus) to prevent false triggering while leaving adequate margin below VBR to ensure reliable transient response.
Can the SMAJ58-E3/5A be used in parallel to increase surge current handling?
No-parallel connection of SMAJ58-E3/5A devices is not recommended due to parameter mismatch (VBR, dynamic impedance) causing uneven current sharing and potential thermal runaway. For higher surge capability, select a single higher-rated device like SMBJ58A-E3/52 or use staged protection with GDT + TVS architecture.
SMAJ58-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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)
SMAJ58-E3/5A FAQ
1.How can I place an order for SMAJ58-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58-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 SMAJ58-E3/5A reliable?
The price and inventory of SMAJ58-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 SMAJ58-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ58-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58-E3/5A?
SMAJ58-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58-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 SMAJ58-E3/5A?
For technical support, including SMAJ58-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58-E3/5A requirements.
6.How does Aetrix verify that SMAJ58-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ58-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 SMAJ58-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ58-E3/5A?
All SMAJ58-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58-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 SMAJ58-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ58-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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