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Vishay General Semiconductor - Diodes Division SMAJ51CAHE3/5A
- Part No.:
- SMAJ51CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CAHE3/5A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,758
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Product details
Overview
SMAJ51CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown range (VBR at 1 mA), 82.4 V maximum clamping voltage (VC) at 4.9 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ51CAHE3/5A datasheet, SMAJ51CAHE3/5A pinout, SMAJ51CAHE3/5A application, or SMAJ51CAHE3/5A equivalent, key selection criteria include bidirectional clamping behavior, low clamping ratio (VC/VWM ≈ 1.62), AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on standard 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 51 V), but triggers into low-impedance conduction when transients exceed its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
The device is rated for repetitive 10/1000 μs surge pulses at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with peak forward surge current capability of 40 A (8.3 ms half-sine) for unidirectional variants - not applicable here due to bidirectional construction. Polarity is non-marked per specification for bidirectional types.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of protected circuit's normal operating range. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown window ensures reliable triggering without premature conduction during nominal operation. |
| VC @ IPPM | 82.4 V at 4.9 A - Clamping voltage limits transient energy delivered to downstream components; critical for IC-level ESD/surge survivability. |
| PPPM | 400 W (10/1000 μs) - Peak surge power handling capacity; determines protection level against lightning-induced or inductive-switching transients. |
| IPPM | 4.9 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify system-level surge margin. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial settings. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs thermal design for repeated surge events. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path (bidirectional) | Either terminal serves as current entry point during positive or negative transients; no cathode band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges without external heat sinking. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during clamping, preserving margin for 5V/3.3V logic interfaces and analog sensor front-ends. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns - eliminates bake requirements pre-assembly. |
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature, reducing parameter drift in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed across power input pins of microcontrollers and CAN transceivers. Use Value: Limits voltage to ≤82.4 V during 400 W surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices downstream. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional clamping element on 4–20 mA or 0–10 V signal paths exposed to EMI and ground bounce. Use Value: Maintains signal integrity by clamping both polarities of induced noise while adding <1 pF capacitance at 0 V bias. |
| Consumer Device USB Port Protection | Telecom Equipment DC Power Input |
|
Use Scenario: Secondary overvoltage protection on USB-C VBUS lines in portable chargers and docking stations. IC Role / Device Role / Timing Role: Standby-mode TVS placed after primary DC-DC converter to absorb residual transients from hot-plug events. Use Value: Withstands 4.9 A surge current without degradation, ensuring long-term reliability in high-volume consumer products. |
Use Scenario: Front-end surge suppression on -48 V telecom power inputs subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp protecting rectifier bridges and PMICs from differential-mode transients on telecom DC distribution boards. Use Value: Rated for 150 °C operation and MSL Level 1, supporting high-reliability, zero-downtime infrastructure deployment. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Choose SMAJ51CA-M3/5A when halogen-free bill-of-materials is required; otherwise SMAJ51CAHE3/5A offers same performance with broader supply chain availability. |
| SMBJ51CAHE3/5A | Same VWM, VBR, VC, but higher PPPM = 600 W and larger SMB (DO-214AA) package; RθJA = 80 °C/W. | Better surge handling for infrequent high-energy events; requires larger PCB footprint and different pad layout. | Select SMBJ51CAHE3/5A only when system-level testing confirms need for >400 W surge margin; SMAJ51CAHE3/5A remains optimal for space-constrained automotive modules. |
Compared with SMAJ51CA-M3/5A, the SMAJ51CAHE3/5A shares identical clamping performance and qualification but differs in material compliance; versus SMBJ51CAHE3/5A, it trades 50% lower surge rating for 33% smaller footprint and tighter thermal coupling to PCB copper.
Availability
SMAJ51CAHE3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, consumer USB port hardening, and telecom DC input surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ51CAHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in space-constrained, high-reliability applications - particularly automotive electronics, industrial controls, and communications infrastructure where consistent clamping and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ51CAHE3/5A at its rated peak pulse current?
The SMAJ51CAHE3/5A has a maximum clamping voltage (VC) of 82.4 V at its specified peak pulse current (IPPM) of 4.9 A, measured using a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream ICs remain within safe voltage margins during surge events. The SMAJ51CAHE3/5A maintains this clamping performance consistently due to its glass-passivated junction and AEC-Q101 validated construction.
Is SMAJ51CAHE3/5A suitable for automotive applications?
Yes, SMAJ51CAHE3/5A is AEC-Q101 qualified and explicitly intended for automotive use, including engine control units, body electronics, and ADAS subsystems. Its operating junction temperature range of –55 °C to +150 °C, MSL Level 1 reflow compatibility, and validated surge endurance meet stringent automotive reliability requirements. The SMAJ51CAHE3/5A is referenced in Vishay's automotive ordering codes and supports ISO 7637-2 compliance when applied per recommended layout guidelines.
How does the bidirectional configuration of SMAJ51CAHE3/5A affect its circuit implementation?
The SMAJ51CAHE3/5A is bidirectional, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity - no cathode marking is present. This allows direct placement across AC-coupled signal lines or ungrounded DC rails without orientation concerns. Unlike unidirectional variants, the SMAJ51CAHE3/5A conducts during either polarity excursion above VBR, making it ideal for protecting differential interfaces and floating power domains where ground reference is unstable.
What is the thermal resistance of SMAJ51CAHE3/5A, and how does it impact layout design?
The SMAJ51CAHE3/5A 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 directly impacts sustained surge capability: repeated 400 W pulses require adequate copper area and minimal trace length to avoid thermal runaway. For high-duty-cycle applications, designers should verify temperature rise using the SMAJ51CAHE3/5A's 3.3 W steady-state power dissipation rating and ensure board layout meets Vishay's recommended pad dimensions.
Does SMAJ51CAHE3/5A have any special handling or assembly requirements?
No special handling is required for SMAJ51CAHE3/5A beyond standard SMT practices: it is MSL Level 1 rated with a maximum peak reflow temperature of 260 °C, eliminating the need for baking or dry-packaging. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, ensuring reliable solder wetting. The SMAJ51CAHE3/5A also passes JESD 201 Class 2 whisker testing, making it suitable for long-life, high-reliability assemblies without post-reflow inspection concerns.
SMAJ51CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ51CAHE3/5A FAQ
1.How can I place an order for SMAJ51CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CAHE3/5A 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 SMAJ51CAHE3/5A reliable?
The price and inventory of SMAJ51CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ51CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CAHE3/5A?
SMAJ51CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CAHE3/5A 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 SMAJ51CAHE3/5A?
For technical support, including SMAJ51CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ51CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ51CAHE3/5A 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 SMAJ51CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ51CAHE3/5A?
All SMAJ51CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CAHE3/5A, 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 SMAJ51CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ51CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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