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Vishay General Semiconductor - Diodes Division SMAJ51CAHE3/61
- Part No.:
- SMAJ51CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CAHE3/61.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,385
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Product details
Overview
SMAJ51CAHE3/61 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 voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 4.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ51CAHE3/61 datasheet, SMAJ51CAHE3/61 pinout, SMAJ51CAHE3/61 application, or SMAJ51CAHE3/61 equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device 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 VBR, diverting surge energy to ground. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the bidirectional structure eliminates polarity concerns in AC-coupled or floating signal paths.
The SMAJ51CAHE3/61 is rated for repetitive 400 W pulses (duty cycle 0.01 %) up to TJ = 150 °C, with derating above 25 °C per Fig. 2. Its MSL Level 1 rating (JEDEC J-STD-020) and matte tin-plated leads support lead-free reflow up to 260 °C peak, and its AEC-Q101 qualification confirms suitability for automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Guaranteed breakdown range ensuring consistent turn-on across production lots and temperature. |
| VC @ IPPM | 82.4 V at 4.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W - Peak pulse power handling with standard 10/1000 μs waveform; defines surge energy absorption capacity. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated standoff; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial enclosures. |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; supports reliable power dissipation without external heatsinking on standard PCB pads. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), cathode band omitted per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during positive or negative surges relative to cathode node. |
| Cathode | Transient return path (bidirectional) | Connects to ground or reference rail; completes low-impedance surge path in either polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control modules. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping - preserves margin for 5 V or 48 V logic and analog front-ends. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable VBR over time and temperature, low leakage, and immunity to surface contamination in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/48 V supply inputs in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and chassis ground, clamping surges within microseconds. Use Value: Withstands 400 W pulses and operates up to +150 °C, meeting ISO 16750-2 and SAE J1113-11 requirements without derating. |
Use Scenario: Safeguarding RS-485, CAN FD, or analog sensor outputs (e.g., pressure, temperature) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair or single-ended line, suppressing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Symmetrical clamping ensures equal protection for both polarities; <1 μA leakage avoids loading low-current sensor outputs. |
| Consumer USB Port Surge Suppression | Telecom DSL/ADSL Line Interface Protection |
Use Scenario: Adding secondary surge protection downstream of primary MOVs in USB-C power delivery circuits. IC Role / Device Role / Timing Role: Fast-response TVS placed between VBUS and GND to clamp fast-rising transients missed by slower bulk protectors. Use Value: 82.4 V clamping voltage provides margin above 20 V PD profiles; SMA package allows compact layout near connector. |
Use Scenario: Protecting ADSL line drivers and receivers from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional TVS connected across line pairs (tip/ring) to shunt common-mode surges to ground. Use Value: 51 V VWM matches typical ADSL line DC bias; 400 W rating handles IEC 61000-4-5 Level 3 (2 kV/1 kA) surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Choose SMAJ51CA-M3/61 when halogen-free material content is contractually required. |
| SMBJ51CAHE3/61 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher RθJA (90 °C/W vs. 120 °C/W), same 400 W PPPM. | Better thermal performance under sustained surge duty; requires larger PCB area (5.28 mm × 4.50 mm vs. 4.93 mm × 3.99 mm). | Choose SMBJ51CAHE3/61 when board space permits and lower thermal resistance is needed for high-repetition surges. |
Compared with SMAJ51CAHE3/61, the SMAJ51CA-M3/61 offers identical protection performance with halogen-free construction, while the SMBJ51CAHE3/61 trades smaller footprint for improved thermal dissipation - enabling longer surge endurance in thermally constrained designs.
Availability
SMAJ51CAHE3/61 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ51CAHE3/61 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 automotive qualification.
The SMAJ series targets high-reliability transient suppression in space-constrained, thermally demanding applications - engineered specifically for automotive, industrial, and telecom systems requiring AEC-Q101 validation and repeatable clamping performance.
FAQ
What is the clamping voltage of SMAJ51CAHE3/61 at its rated peak pulse current?
The SMAJ51CAHE3/61 has a maximum clamping voltage (VC) of 82.4 V at its specified peak pulse current (IPPM) of 4.9 A, measured with a 10/1000 μs waveform. This value is guaranteed across temperature and production lot, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ51CAHE3/61 maintains this clamping performance while operating up to +150 °C junction temperature.
Is SMAJ51CAHE3/61 suitable for automotive applications?
Yes, SMAJ51CAHE3/61 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and matte tin-plated leads compatible with lead-free reflow up to 260 °C. The SMAJ51CAHE3/61 meets ISO 16750-2 and SAE J1113-11 test requirements when applied per Vishay's recommended PCB layout and thermal guidelines.
How does the bidirectional configuration of SMAJ51CAHE3/61 affect its circuit implementation?
The bidirectional configuration of SMAJ51CAHE3/61 means it functions identically for positive and negative transients - no polarity marking is present, and both terminals are electrically symmetric. This simplifies layout on AC-coupled lines (e.g., RS-485, CAN, audio) and eliminates risk of incorrect orientation during assembly. Unlike unidirectional variants, the SMAJ51CAHE3/61 does not conduct forward current; its leakage remains ≤1.0 μA at 51 V in either direction.
What is the thermal resistance of SMAJ51CAHE3/61, and how does it impact PCB layout?
The SMAJ51CAHE3/61 has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means effective heat dissipation relies on adequate copper area: reducing pad size increases thermal impedance and may require derating of pulse power. The SMAJ51CAHE3/61 achieves full 400 W rating only with the specified minimum pad layout.
Does SMAJ51CAHE3/61 have any special handling or packaging requirements?
SMAJ51CAHE3/61 is supplied in 7" plastic tape-and-reel (EIA-481-D compliant) with 1800 units per reel (package code /61). As an MSL Level 1 device, it requires no dry pack or baking prior to SMT assembly. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and it passes JESD 201 Class 2 whisker testing - making it suitable for high-reliability, long-lifecycle production without special handling protocols.
SMAJ51CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMAJ51CAHE3/61 FAQ
1.How can I place an order for SMAJ51CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CAHE3/61 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 SMAJ51CAHE3/61 reliable?
The price and inventory of SMAJ51CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CAHE3/61?
SMAJ51CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CAHE3/61 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 SMAJ51CAHE3/61?
For technical support, including SMAJ51CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ51CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51CAHE3/61 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 SMAJ51CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51CAHE3/61?
All SMAJ51CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CAHE3/61, 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 SMAJ51CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ51CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51CAHE3/61 Tags
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