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Vishay General Semiconductor - Diodes Division SMAJ51-E3/61
- Part No.:
- SMAJ51-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51-E3/61.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,264
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Product details
Overview
SMAJ51-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 56.7–69.3 V breakdown voltage (VBR at 1 mA), 91.1 V maximum clamping voltage (VC) at 4.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to safeguard ICs, MOSFETs, and sensor signal lines in industrial and automotive systems.
For engineers reviewing the SMAJ51-E3/61 datasheet, SMAJ51-E3/61 pinout, SMAJ51-E3/61 application, or SMAJ51-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC mechanical data, clamping performance under surge conditions, RoHS-compliant commercial-grade construction, and validated alternatives for ESD and lightning-induced transient suppression.
Technical Context
The SMAJ51-E3/61 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 56.7–69.3 V), with fast response time (<1 ps) and low dynamic impedance enabling effective clamping during transients. Its glass-passivated junction ensures stable leakage and long-term reliability under repetitive surge stress.
Thermal performance is defined by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL level 1 per J-STD-020 and is rated for solder dip at 260 °C for 40 s, confirming suitability for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below clamping onset. |
| VBR (min/max) | 56.7 V / 69.3 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on under surge; critical for coordination with downstream IC tolerances. |
| VC @ IPPM | 91.1 V at 4.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 400 W - Peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V lines. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports robustness against inductive switch-off events. |
| Junction Temp Range | –55 °C to +150 °C - Specifies full operational envelope for automotive under-hood and industrial control environments. |
| Leakage Current | 1 µA max at VWM - Ensures minimal standby power loss and signal integrity in high-impedance sensor interfaces. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD22-B102. Cathode identified by a band on the body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point in normal bias; connected to system ground or lower-potential rail. | Provides reference node for clamping action; must be routed with low-inductance path to minimize overshoot during surge. |
| Cathode | Reverse-biased terminal during protection event; connected to line being protected. | Carries full surge current during clamping; requires adequate copper area (0.2 × 0.2″ pads recommended) for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime, critical for automotive-grade reliability. |
| 400 W peak pulse power (10/1000 µs) | Supports protection against severe transients including ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 combination wave surges. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard reflow profiles up to 260 °C peak. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets EU Directive 2002/95/EC; JESD201 Class 1A whisker resistance ensures long-term solder joint integrity. |
| Low incremental surge resistance | Minimizes VC rise under high di/dt events, improving clamping precision for fast-rising transients like ESD. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay and solenoid switching in PLCs and motor drives. IC Role / Device Role: Unidirectional TVS placed between protected signal line and ground to clamp negative-going transients. Use Value: Limits voltage excursion to ≤91.1 V during 4.4 A surges, preventing latch-up or oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors from load dump and jump-start transients in 12 V vehicle networks. IC Role / Device Role: Standoff-rated TVS on power input and data lines to absorb energy while maintaining <1 µA leakage at 51 V. Use Value: Withstands 40 A surge (8.3 ms) and maintains clamping below 95 V, meeting ISO 16750-2 requirements for battery line protection. |
| Consumer Power Adapters | Telecom Interface Ports |
|
Use Scenario: Secondary-side overvoltage suppression on DC output rails of AC/DC adapters exposed to lightning-induced surges via mains coupling. IC Role / Device Role: Final-stage TVS shunting transient energy to ground after primary-side isolation and filtering. Use Value: 400 W rating allows absorption of 10/1000 µs surges up to 4.4 A without degradation, extending adapter field life. |
Use Scenario: Protection of Ethernet PHY and RS-485 transceivers against ESD and induced surges on outdoor cabling in base station backhaul links. IC Role / Device Role: Line-to-ground TVS on differential pairs to maintain signal integrity while diverting common-mode transients. Use Value: Low capacitance (typ. <100 pF at VWM) avoids signal distortion at 100 Mbps; clamps within 1 ns to preserve timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/61 | Lower VBR range (56.7–62.7 V), tighter tolerance; 82.4 V clamping at 4.9 A. | Better suited for systems requiring lower clamping voltage at higher surge current, e.g., 3.3 V logic with tight VDD margins. | Select SMAJ51A-E3/61 when clamping voltage headroom is constrained and VBR consistency is prioritized over absolute power rating. |
| SMBJ51A-E3/52 | DO-214AA (SMB) package; same VWM/VBR, but 600 W PPPM and 6.4 A IPPM; larger footprint. | Higher power handling supports longer-duration surges; requires PCB layout change due to larger pad dimensions. | Choose SMBJ51A-E3/52 for enhanced surge endurance where board space permits and thermal mass can be increased. |
Compared with SMAJ51-E3/61, SMAJ51A-E3/61 offers improved clamping precision at slightly reduced surge current capacity, while SMBJ51A-E3/52 trades compactness for 50 % higher pulse power - making SMAJ51-E3/61 optimal for space-constrained 400 W protection with commercial-grade reliability.
Availability
SMAJ51-E3/61 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and consumer power adapter designs requiring stable component supply, RoHS compliance, and proven surge immunity.
Supply support for SMAJ51-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 high-reliability diodes, rectifiers, and protection devices engineered for harsh-environment operation.
The SMAJ series was developed specifically for surface-mount transient suppression in automotive, industrial, and telecom infrastructure, emphasizing low clamping, repeatable breakdown, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of the SMAJ51-E3/61 under surge conditions?
The SMAJ51-E3/61 has a maximum clamping voltage (VC) of 91.1 V at 4.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ51-E3/61 maintains this clamping performance across its specified junction temperature range.
Is the SMAJ51-E3/61 suitable for automotive applications?
The SMAJ51-E3/61 is a commercial-grade (E3 suffix) part, not AEC-Q101 qualified; for automotive use, Vishay specifies the HE3-suffix variants (e.g., SMAJ51HE3/61). While SMAJ51-E3/61 shares identical electrical specs and DO-214AC packaging, it lacks the extended reliability testing required for under-hood deployment. Engineers should select SMAJ51HE3/61 for automotive body electronics requiring AEC-Q101 certification.
What does the "/61" suffix indicate in SMAJ51-E3/61?
The "/61" suffix in SMAJ51-E3/61 denotes the preferred package code per Vishay's ordering information: it specifies 7-inch diameter plastic tape and reel packaging with a base quantity of 1800 units. This format is optimized for high-speed pick-and-place assembly and aligns with industry-standard SMT feeder compatibility. The "/61" does not affect electrical or thermal characteristics of the SMAJ51-E3/61 device itself.
How does the SMAJ51-E3/61 compare to bi-directional TVS diodes like SMAJ51CA?
The SMAJ51-E3/61 is unidirectional and conducts only in reverse bias above VBR, whereas SMAJ51CA is bi-directional with symmetrical clamping in both polarities. SMAJ51-E3/61 provides lower leakage (<1 µA at 51 V) and is ideal for DC line protection with defined polarity; SMAJ51CA suits AC or floating signal lines. Their VWM, VBR, and VC differ - SMAJ51-E3/61 is not interchangeable with SMAJ51CA without circuit review.
What thermal derating applies to the SMAJ51-E3/61 above 25 °C ambient?
The SMAJ51-E3/61 follows Vishay's Fig. 2 derating curve: peak pulse power decreases linearly above TA = 25 °C, with full 400 W rating valid only at 25 °C. At 75 °C ambient, power drops to ~280 W; at 125 °C, it falls to ~120 W. Derating is based on RθJA = 120 °C/W and assumes minimum recommended copper pad layout (0.2 × 0.2″ per terminal). The SMAJ51-E3/61 remains functional up to +150 °C junction temperature.
SMAJ51-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMAJ51-E3/61 FAQ
1.How can I place an order for SMAJ51-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51-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 SMAJ51-E3/61 reliable?
The price and inventory of SMAJ51-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 SMAJ51-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51-E3/61?
SMAJ51-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51-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 SMAJ51-E3/61?
For technical support, including SMAJ51-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51-E3/61 requirements.
6.How does Aetrix verify that SMAJ51-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51-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 SMAJ51-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51-E3/61?
All SMAJ51-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51-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 SMAJ51-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ51-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51-E3/61 Tags
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