My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ51A-E3/61
- Part No.:
- SMAJ51A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51A-E3/61.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,070
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ51A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown range at 1 mA, and clamps transients up to 82.4 V at 4.9 A peak pulse current under a 10/1000 μs waveform - ideal for safeguarding power rails and I/O lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMAJ51A-E3/61 datasheet, SMAJ51A-E3/61 pinout, SMAJ51A-E3/61 application, or SMAJ51A-E3/61 equivalent, key selection criteria include its 400 W peak pulse power rating, low 0.01 % duty cycle capability, unidirectional polarity with cathode band marking, and SMA (DO-214AC) package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and fast response (<1 ps), while the low incremental surge resistance minimizes clamping voltage overshoot during transient events.
Designed for single-polarity DC line protection, SMAJ51A-E3/61 supports repetitive surge handling per JEDEC JESD22-A114 (ESD), IEC 61000-4-5 (surge), and ISO 7637-2 (automotive load dump), with thermal resistance RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across temperature and unit variance. |
| VC (Clamping Voltage) | 82.4 V at 4.9 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W - energy-handling capacity for non-repetitive transients; derates to 300 W above 78 V per spec. |
| IPPM (Peak Pulse Current) | 4.9 A - maximum surge current the device can shunt without failure; calculated from PPPM/VC. |
| TJmax | 150 °C - maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - industry-standard 2-pin surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; optimized for reflow and wave soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), RoHS-compliant (E3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected circuit return path / surge sink | Connected to ground or low-impedance reference; conducts avalanche current during overvoltage events. |
| Anode | Line input / signal source connection | Connected to the line being protected (e.g., 48 V rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables reliable suppression of high-energy transients like ISO 7637-2 Pulse 5a (load dump) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage stress on downstream ICs - critical for 5V-tolerant microcontrollers and CAN transceivers. |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage performance across temperature and lifetime cycling. |
| AEC-Q101 qualified option available | HE3 suffix variant meets automotive reliability standards for engine control, body electronics, and ADAS subsystems. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to SMT assembly; supports direct placement from dry pack into reflow process. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
|
Use Scenario: Protection of 48 V auxiliary power rails against switching transients from brushed DC motor commutation and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input capacitor to clamp induced spikes before they reach DC-DC converters and MCU power supplies. Use Value: Limits transient voltage to ≤82.4 V, preventing latch-up or gate oxide damage in 65 V-rated MOSFETs and 5V LDOs. |
Use Scenario: Safeguarding LIN bus physical layer and sensor supply lines in ECU modules exposed to battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between LIN line and chassis ground, absorbing ISO 7637-2 Pulse 5a surges up to 100 V. Use Value: Maintains signal integrity below LIN transceiver's absolute max rating (typically 40 V) via fast <1 ps response and low VC. |
| Telecom Power Interfaces | Consumer USB-C PD Adapters |
|
Use Scenario: Input-stage surge protection for 48 V PoE-powered equipment subjected to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side 48 V output rail, coordinated with upstream MOVs and gas discharge tubes. Use Value: Provides precise 51 V standoff and 82.4 V clamping to protect synchronous rectifier controllers rated for 100 V max drain-source voltage. |
Use Scenario: Overvoltage suppression on 20 V USB-C PD output rails during hot-plug events and adapter fault conditions. IC Role / Device Role / Timing Role: Secondary-side TVS placed between VBUS and GND to limit fault voltage during short-circuit or overvoltage faults in buck-boost regulators. Use Value: Clamps to 82.4 V within nanoseconds, preventing damage to USB-C port controllers and Type-C CC logic circuits. |
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-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Choose SMAJ51A-M3/61 when material declarations require halogen-free status per IEC 61249-2-21. |
| SMAJ51AHE3_A/61 | AEC-Q101 qualified version with same VWM, VBR, and VC; validated for automotive temperature cycling and humidity testing. | Required for under-hood and safety-critical automotive applications where qualification evidence is mandatory. | Select SMAJ51AHE3_A/61 for automotive designs needing documented AEC-Q101 conformance and extended reliability data. |
Compared with SMAJ51A-E3/61, the M3 variant adds halogen-free compliance without altering surge performance, while the HE3 variant delivers full AEC-Q101 qualification - enabling drop-in use in commercial, industrial, and automotive systems respectively, with no PCB layout change required.
Availability
SMAJ51A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive ECUs, telecom power interfaces, and consumer USB-C PD adapters requiring stable component supply, consistent lead-time visibility, and long-term obsolescence management.
Supply support for SMAJ51A-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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and high-power handling.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, surge, and load dump is mission-critical.
FAQ
What is the maximum clamping voltage of SMAJ51A-E3/61 under a 10/1000 μs surge?
The SMAJ51A-E3/61 clamps to a maximum of 82.4 V at 4.9 A peak pulse current when subjected to a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and represents the highest voltage the protected circuit will experience during such a transient - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMAJ51A-E3/61 suitable for automotive applications?
SMAJ51A-E3/61 itself is commercial-grade; however, the functionally identical SMAJ51AHE3_A/61 variant is AEC-Q101 qualified and approved for automotive use. For non-safety-critical cabin modules or aftermarket systems, SMAJ51A-E3/61 may be used - but design-in for engine bay or ADAS applications requires the HE3 suffix version with full qualification documentation.
What does the "E3/61" suffix mean in SMAJ51A-E3/61?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "61" specifies the packaging format: 7-inch diameter plastic tape and reel containing 1800 units. This ordering code ensures correct material compliance, plating, and logistics configuration - essential for automated SMT line setup and traceability.
How does SMAJ51A-E3/61 compare to SMAJ48A-E3/61 in terms of voltage rating?
SMAJ51A-E3/61 has a 51 V standoff voltage (VWM) and 56.7–62.7 V breakdown range, whereas SMAJ48A-E3/61 offers 48 V VWM and 53.3–58.9 V VBR. The higher rating of SMAJ51A-E3/61 provides greater margin for 48 V nominal systems experiencing ±6% regulation tolerance, reducing risk of premature conduction during normal operation.
Can SMAJ51A-E3/61 be used in bidirectional configurations?
No - SMAJ51A-E3/61 is strictly unidirectional, indicated by the "A" suffix and cathode band marking. For bidirectional protection (e.g., AC lines or differential buses), the SMAJ51CA-E3/61 variant must be used, which exhibits symmetrical clamping in both polarities and carries the "CA" suffix per Vishay's naming convention.
SMAJ51A-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:
- 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-E3/61 FAQ
1.How can I place an order for SMAJ51A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51A-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 SMAJ51A-E3/61 reliable?
The price and inventory of SMAJ51A-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 SMAJ51A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51A-E3/61?
SMAJ51A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51A-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 SMAJ51A-E3/61?
For technical support, including SMAJ51A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51A-E3/61 requirements.
6.How does Aetrix verify that SMAJ51A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51A-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 SMAJ51A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51A-E3/61?
All SMAJ51A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51A-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 SMAJ51A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ51A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51A-E3/61 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
