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Vishay General Semiconductor - Diodes Division SMAJ51A-M3/61
- Part No.:
- SMAJ51A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51A-M3/61.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ51A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 4.9 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ51A-M3/61 datasheet, SMAJ51A-M3/61 pinout, SMAJ51A-M3/61 application, or SMAJ51A-M3/61 equivalent, key selection criteria include verified clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification eligibility via HM3 suffix variants, and halogen-free RoHS compliance per M3 grading.
Technical Context
This TVS diode operates as a fast-acting shunt protector, entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance, enabling consistent clamping across repetitive transients.
The device responds in <1 ps to ESD and lightning-induced surges, with a typical junction capacitance below 100 pF at 0 V (measured at 1 MHz), making it suitable for DC power rails and low-speed signal lines where capacitive loading must remain minimal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin. |
| VBR min/max | 56.7 V / 62.7 V at IT = 1 mA - Confirmed avalanche onset range; ensures reliable turn-on within spec across temperature and lot variation. |
| VC @ IPPM | 82.4 V at 4.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure level. |
| PPPM | 400 W (≤78 V) - Peak surge energy handling capability; supports IEC 61000-4-5 Level 4 (4 kV) protection with proper PCB layout. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 0.2" × 0.2" copper pads; dictates derating above 25 °C ambient. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables robustness against accidental forward polarity misapplication. |
| Operating TJ | −55 °C to +150 °C - Validated junction temperature range; supports under-hood automotive and industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; meets UL 94 V-0 and JESD 201 Class 2 whisker resistance. Polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to lower-potential side (e.g., GND or return rail); completes clamping loop during reverse surge. |
| Cathode | Transient voltage sensing / clamping node | Marked with band; connected to protected line (e.g., 51 V supply rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 surge events up to 4 kV without external series impedance. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture or contamination ingress. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without pre-baking; compatible with IPC-J-STD-020 requirements. |
| Halogen-free & RoHS-compliant (M3) | Fulfills EU RoHS Directive 2011/65/EU and JEDEC JS709C material restrictions; no brominated flame retardants. |
| AEC-Q101 qualified variant available | HM3 suffix versions meet stress test requirements for automotive electronics (e.g., HTGB, TCT, HTRB). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied control modules exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp transients before regulation stage. Use Value: Limits voltage to ≤82.4 V during 400 W surges, preventing damage to downstream 3.3 V/5 V logic and CAN transceivers. |
Use Scenario: Analog output lines (4–20 mA, 0–10 V) from pressure/temperature sensors in factory automation cabinets. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to suppress ESD (IEC 61000-4-2 ±8 kV contact) and inductive switching noise. Use Value: Sub-100 pF capacitance avoids signal distortion; 51 V VWM allows compatibility with 24 V sensor supply while blocking normal operation voltage. |
| DC-DC Converter Input Protection | Microcontroller GPIO Line Protection |
|
Use Scenario: 48 V input to isolated buck converter in telecom power systems subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of input filter capacitor and active rectifier stage. Use Value: Withstands 400 W pulses without degradation; RθJA = 120 °C/W enables thermal design using standard 5 mm² copper pads. |
Use Scenario: External interrupt or reset pins on ARM Cortex-M microcontrollers interfacing with industrial field wiring. IC Role / Device Role / Timing Role: Low-capacitance TVS tied between GPIO and ground to divert ESD strikes before internal ESD diodes fail. Use Value: 82.4 V clamping prevents latch-up; 1 μA max leakage at 51 V preserves low-power sleep current budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | No difference in protection function; unsuitable where halogen-free compliance is mandated (e.g., EU public infrastructure tenders). | Select E3 only if halogen content is unrestricted and cost sensitivity outweighs material specification requirements. |
| SMAJ51CA-M3/61 | Bidirectional version; symmetric VBR (56.7–62.7 V) in both directions; same VWM and VC ratings. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Choose CA only when protecting bidirectional signals; unidirectional SMAJ51A-M3/61 offers lower leakage and simpler layout for DC rails. |
Compared with SMAJ51A-E3/61, the M3 variant adds halogen-free compliance without performance trade-offs; versus SMAJ51CA-M3/61, the unidirectional version provides tighter leakage control and eliminates unnecessary bidirectional conduction paths in DC applications.
Availability
SMAJ51A-M3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ51A-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, power efficiency, and automotive-grade qualification.
The SMAJ series targets high-energy transient suppression in space-constrained applications; engineered for robustness in harsh environments including automotive under-hood, industrial controls, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of SMAJ51A-M3/61 under a 10/1000 μs surge?
The SMAJ51A-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. The SMAJ51A-M3/61 maintains this clamping performance across its rated operating temperature range.
Is SMAJ51A-M3/61 suitable for automotive applications?
SMAJ51A-M3/61 itself is commercial-grade, but Vishay offers AEC-Q101 qualified variants under the HM3 suffix (e.g., SMAJ51A-HM3/61). The base SMAJ51A-M3/61 shares identical electrical and thermal characteristics, packaging, and reliability testing-only the qualification documentation differs. For production automotive use, specify the HM3 version; SMAJ51A-M3/61 remains appropriate for prototyping and non-qualified industrial designs.
How does the M3 suffix differ from E3 in SMAJ51A-M3/61?
The M3 suffix denotes halogen-free, RoHS-compliant construction, whereas E3 is RoHS-compliant but contains halogenated flame retardants. Both meet JEDEC JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow requirements. The SMAJ51A-M3/61 is specified for applications requiring full compliance with JEDEC JS709C and EU green directives where halogen content is restricted, such as public infrastructure or medical equipment.
What is the thermal resistance of SMAJ51A-M3/61, and how does it affect layout?
SMAJ51A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AC footprint. To maintain safe junction temperature under repetitive surges, designers must ensure adequate copper area and avoid excessive trace length; exceeding 150 °C TJ requires derating per Figure 2 in document 88390.
Can SMAJ51A-M3/61 be used in bidirectional signal lines like RS-485?
No-SMAJ51A-M3/61 is unidirectional and conducts only when cathode is positive relative to anode. For bidirectional lines such as RS-485 or CAN, the bidirectional variant SMAJ51CA-M3/61 must be used. That part exhibits symmetrical clamping in both polarities and is marked without polarity band. Using SMAJ51A-M3/61 on AC-coupled lines risks forward conduction during negative transients, potentially damaging the device or circuit.
SMAJ51A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ51A-M3/61 FAQ
1.How can I place an order for SMAJ51A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51A-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 SMAJ51A-M3/61 reliable?
The price and inventory of SMAJ51A-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 SMAJ51A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51A-M3/61?
SMAJ51A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51A-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 SMAJ51A-M3/61?
For technical support, including SMAJ51A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51A-M3/61 requirements.
6.How does Aetrix verify that SMAJ51A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51A-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 SMAJ51A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51A-M3/61?
All SMAJ51A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51A-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 SMAJ51A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ51A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51A-M3/61 Tags
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