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Vishay General Semiconductor - Diodes Division SMAJ51CA-M3/61
- Part No.:
- SMAJ51CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CA-M3/61.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,768
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Product details
Overview
SMAJ51CA-M3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 51 V standoff voltage (VWM), 82.4 V maximum clamping voltage (VC) at 4.9 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) capability with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ51CA-M3/61 datasheet, SMAJ51CA-M3/61 pinout, SMAJ51CA-M3/61 application, or SMAJ51CA-M3/61 equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJL = 30 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT placement on standard SMA (DO-214AC) footprints.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under transient overvoltage events exceeding its breakdown voltage (VBR min = 56.7 V, max = 62.7 V at 1 mA), it rapidly switches to low-impedance conduction, diverting surge current away from downstream ICs or MOSFETs. Its bidirectional architecture ensures symmetrical clamping in both polarities without polarity marking.
It delivers fast response (< 1 ns), low incremental surge resistance, and stable performance across -55 °C to +150 °C junction temperature range. The device is rated for 40 A non-repetitive forward surge (IFSM) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - guaranteed breakdown threshold defining turn-on window |
| VC @ IPPM | 82.4 V at 4.9 A - clamping voltage limiting protected circuit stress during 10/1000 μs surge |
| PPPM | 400 W - peak transient energy handling capacity under standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensuring minimal standby power loss and signal integrity |
| RθJL | 30 °C/W - low junction-to-lead thermal resistance enabling efficient heat transfer to PCB copper |
| TJ max. | +150 °C - extended thermal operating limit supporting under-hood automotive and industrial environments |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount, low-profile plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, compatible with JEDEC-standard 0.2" × 0.2" copper pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common terminal in bidirectional operation | No physical marking; symmetric terminals enable polarity-agnostic placement on PCB |
| Cathode | Current exit point in forward bias; common terminal in bidirectional operation | No band or marking - distinguishes it from unidirectional variants (e.g., SMAJ51A); requires no orientation check during assembly |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when mounted per recommended pad layout |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental compliance requirements including JESD201 Class 2 whisker resistance |
| AEC-Q101 qualification path | HM3 variant available - supports automotive-grade reliability validation for engine control, ADAS, and body electronics |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak, simplifying high-volume SMT manufacturing |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed directly at connector interface to limit voltage excursion before reaching sensitive analog front-end or communication IC. Use Value: Maintains signal integrity by clamping transients to ≤82.4 V while surviving repetitive 400 W surges - critical for ASIL-B functional safety paths. | Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage guard on channel-level inputs, positioned upstream of optocoupler or Schmitt-trigger input stage. Use Value: Enables robust operation in harsh factory environments with >100,000 surge cycles due to low clamping voltage and 150 °C junction rating. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Secondary-side surge suppression on Ethernet PHY power rails and RS-485 bus lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-reacting voltage limiter between isolated DC-DC output and transceiver IC supply pins. Use Value: Prevents latch-up and gate oxide damage in 3.3 V/5 V logic ICs by clamping transients within 1 ns and holding VC < 83 V. | Use Scenario: Input-stage protection for USB-C PD controller power inputs and auxiliary voltage rails in compact wall adapters. IC Role / Device Role / Timing Role: First-line defense against ESD (IEC 61000-4-2 ±15 kV contact) and accidental AC mains coupling into low-voltage domains. Use Value: Delivers certified ESD immunity without derating - verified with 1.0 μA leakage at 51 V ensures no impact on adapter efficiency or standby power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA-E3/61 | RoHS-compliant commercial grade; same electrical specs but not halogen-free; no AEC-Q101 path | Suitable for non-automotive industrial and consumer designs where halogen-free mandate does not apply | Select when cost sensitivity outweighs environmental compliance requirements and automotive qualification is unnecessary |
| SMLJ51CA-M3 | Higher 3 kW peak pulse power (10/1000 μs); larger SMC (DO-214AB) package; identical VWM/VC specs | Used where higher surge margin is required (e.g., outdoor telecom, solar inverters) and board space allows larger footprint | Choose when system-level surge testing exceeds 400 W and thermal mass from larger package improves reliability |
Compared with SMAJ51CA-E3/61, the SMAJ51CA-M3/61 adds halogen-free compliance and whisker resistance; versus SMLJ51CA-M3, it trades 7.5× lower surge rating for 40 % smaller PCB area and full MSL Level 1 reflow compatibility.
Availability
SMAJ51CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply, consistent M3 environmental compliance, and long-term production continuity.
Supply support for SMAJ51CA-M3/61 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in space-constrained, high-surge environments - targeting automotive, industrial, and communications systems where robustness and manufacturability are co-prioritized.
FAQ
What is the clamping voltage of SMAJ51CA-M3/61 under a 10/1000 μs surge?
The SMAJ51CA-M3/61 has a maximum clamping voltage (VC) of 82.4 V at 4.9 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ51CA-M3/61 suitable for automotive applications?
The SMAJ51CA-M3/61 itself is a commercial-grade halogen-free part; however, the HM3 variant (e.g., SMAJ51CAHM3_A/H) is AEC-Q101 qualified. For automotive use, specify the HM3 suffix to obtain the qualified version. The base SMAJ51CA-M3/61 shares identical electrical characteristics and packaging but lacks formal automotive qualification documentation.
What does the "CA" suffix indicate in SMAJ51CA-M3/61?
The "CA" suffix in SMAJ51CA-M3/61 denotes bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants (e.g., SMAJ51A), SMAJ51CA-M3/61 has no cathode band marking and functions identically in either polarity, simplifying layout for AC-coupled or floating circuits.
What is the thermal resistance from junction to lead (RθJL) for SMAJ51CA-M3/61?
The SMAJ51CA-M3/61 has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, as specified in the Thermal Characteristics table of Vishay document 88390. This low value enables effective heat transfer from the silicon die to the PCB copper pads via the leads, supporting reliable operation at elevated ambient temperatures up to +125 °C with appropriate layout.
How does SMAJ51CA-M3/61 differ from SMAJ51A-M3/61?
SMAJ51CA-M3/61 is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMAJ51A-M3/61 is unidirectional with a cathode band and only clamps reverse surges. Their VWM (51 V), VBR (56.7–62.7 V), and VC (82.4 V) are identical, but SMAJ51A-M3/61 conducts forward current up to 40 A (IFSM) and exhibits 3.5 V forward voltage at 25 A - functionality absent in the CA version.
SMAJ51CA-M3/61 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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)
SMAJ51CA-M3/61 FAQ
1.How can I place an order for SMAJ51CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CA-M3/61 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 SMAJ51CA-M3/61 reliable?
The price and inventory of SMAJ51CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CA-M3/61?
SMAJ51CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CA-M3/61 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 SMAJ51CA-M3/61?
For technical support, including SMAJ51CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ51CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51CA-M3/61 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 SMAJ51CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51CA-M3/61?
All SMAJ51CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CA-M3/61, 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 SMAJ51CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ51CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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