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Vishay General Semiconductor - Diodes Division SMAJ51CAHE3_A/I
- Part No.:
- SMAJ51CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CAHE3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,406
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Product details
Overview
SMAJ51CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features a 51 V stand-off voltage (VWM), 82.4 V maximum clamping voltage (VC) at 4.9 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for safeguarding MOSFETs, ICs, and sensor interfaces against ESD and inductive switching transients.
For engineers reviewing the SMAJ51CAHE3_A/I datasheet, SMAJ51CAHE3_A/I pinout, SMAJ51CAHE3_A/I application, or SMAJ51CAHE3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transient events exceeding 51 V, it avalanches symmetrically in both directions to clamp line voltage to ≤82.4 V. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ns), while the SMA package supports high surge current handling (4.9 A IPPM) without thermal runaway under repetitive 0.01% duty cycle conditions.
Designed for bidirectional signal-line protection, SMAJ51CAHE3_A/I delivers matched forward/reverse breakdown characteristics (VBR min/max = 56.7/62.7 V at 1 mA), exhibits low incremental surge resistance, and maintains reliable operation across –55 °C to +150 °C junction temperature range - meeting UL 497B recognition and J-STD-020 MSL Level 1 reflow requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping initiates |
| VC @ IPPM | 82.4 V at 4.9 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - peak pulse power handling capability under standardized transient waveform |
| RθJL | 30 °C/W - low junction-to-lead thermal resistance enables efficient heat dissipation into PCB copper |
| TJ max. | +150 °C - maximum junction temperature rating supporting automotive under-hood environments |
| MSL Level | Level 1 per J-STD-020 - no floor life limitation; compatible with standard 260 °C peak reflow profile |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of bidirectional avalanche junction; conducts during negative transients |
| Cathode | Transient current entry (forward bias) | Other terminal of bidirectional avalanche junction; conducts during positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Matched VBR (56.7–62.7 V) and VC in both directions ensures consistent protection on AC or differential lines |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low RθJL (30 °C/W) | Enables effective thermal coupling to PCB copper pads, sustaining repetitive surge events without derating |
| UL 497B recognition (QVGQ2) | Meets safety standards for telecom and industrial signal-line protectors |
| Matte tin-plated leads | Ensures reliable solderability per J-STD-002 and JESD 22-B102, with JESD 201 Class 2 whisker resistance |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector or IC input pins. Use Value: Clamps transients to ≤82.4 V within nanoseconds, preserving signal integrity and preventing latch-up in AEC-Q100 qualified microcontrollers. | Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on channel-level signal paths before optocoupler or Schmitt trigger input stages. Use Value: Withstands 400 W pulses without degradation, enabling >100,000 surge cycles in harsh factory environments. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Protecting Ethernet PHY magnetics and PoE interface circuits from lightning-induced surges and EFT bursts. IC Role / Device Role / Timing Role: Secondary-level protector after gas discharge tube (GDT), located adjacent to RJ45 jack or transformer center tap. Use Value: Bidirectional symmetry eliminates polarity concerns on differential pairs; UL 497B recognition supports regulatory compliance. | Use Scenario: Input-stage surge suppression on 5 V/12 V/24 V wall adapters and USB-C PD power bricks exposed to mains-borne transients. IC Role / Device Role / Timing Role: First-line clamping device across DC input rails before primary-side controller and bulk capacitor. Use Value: 51 V VWM aligns with 24 V nominal systems; 82.4 V VC ensures MOSFET and controller FETs remain within safe SOA limits. |
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-M3 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected when halogen-free material compliance is required by OEM spec | Choose SMAJ51CA-M3 for green manufacturing programs requiring IEC 61249-2-21 compliance |
| SMBJ51CAHE3_A/I | Same VWM/VC ratings but in larger SMB (DO-214AA) package; higher IPPM (7.5 A) and PPPM (600 W) | Better suited for higher-energy transients; requires larger PCB footprint and different pad layout | Choose SMBJ51CAHE3_A/I when system-level testing reveals margin shortfall with SMAJ51CAHE3_A/I's 4.9 A IPPM |
Compared with SMAJ51CAHE3_A/I, SMAJ51CA-M3 offers identical protection performance with halogen-free packaging, while SMBJ51CAHE3_A/I provides 53% higher surge current capacity at the cost of increased board area - enabling trade-offs between space-constrained designs and higher transient immunity.
Availability
SMAJ51CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ51CAHE3_A/I 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 optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering precise clamping, AEC-Q101 validation, and robust SMT manufacturability in the compact SMA package.
FAQ
What is the clamping voltage of SMAJ51CAHE3_A/I at its rated peak pulse current?
The SMAJ51CAHE3_A/I has a maximum clamping voltage (VC) of 82.4 V when subjected to its specified peak pulse current (IPPM) of 4.9 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry remains within safe operating voltage limits during transient events. The clamping performance is symmetric in both directions due to its bidirectional design.
Is SMAJ51CAHE3_A/I qualified for automotive applications?
Yes, SMAJ51CAHE3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness required for automotive electronics. Its qualification covers operation from –55 °C to +150 °C junction temperature and supports use in engine control, body electronics, and ADAS sensor modules where reliability under harsh conditions is critical.
What is the thermal resistance from junction to lead (RθJL) for SMAJ51CAHE3_A/I?
The SMAJ51CAHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W. This low value allows efficient heat transfer from the silicon die to the PCB copper pads via the device's leads, supporting repetitive surge operation without excessive temperature rise. It is measured under standard mounting conditions using 0.2" × 0.2" copper pads per terminal, per the Vishay datasheet.
Does SMAJ51CAHE3_A/I have polarity markings on the package?
No, SMAJ51CAHE3_A/I does not have polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (which feature a cathode band), the SMAJ51CAHE3_A/I uses a symmetrical two-terminal structure with identical avalanche characteristics in both directions - eliminating orientation concerns during PCB layout and automated placement.
What is the maximum peak pulse power rating for SMAJ51CAHE3_A/I?
The SMAJ51CAHE3_A/I has a peak pulse power rating (PPPM) of 400 W when tested with the standard 10/1000 μs double-exponential waveform at TA = 25 °C. This rating applies up to 78 V VWM; above that threshold, the rating reduces to 300 W. The 400 W capability enables robust protection against common ESD, EFT, and inductive switching transients in industrial and automotive systems.
SMAJ51CAHE3_A/I 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ51CAHE3_A/I FAQ
1.How can I place an order for SMAJ51CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CAHE3_A/I 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 SMAJ51CAHE3_A/I reliable?
The price and inventory of SMAJ51CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ51CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CAHE3_A/I?
SMAJ51CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CAHE3_A/I 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 SMAJ51CAHE3_A/I?
For technical support, including SMAJ51CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ51CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ51CAHE3_A/I 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 SMAJ51CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ51CAHE3_A/I?
All SMAJ51CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CAHE3_A/I, 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 SMAJ51CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ51CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51CAHE3_A/I Tags
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