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Diodes Incorporated SMAJ51A-13-F
- Part No.:
- SMAJ51A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51A-13-F.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:13,215
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Product details
Overview
SMAJ51A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 51V reverse standoff voltage (VRWM), 82.4V maximum clamping voltage at 4.9A peak pulse current, and fast response time under 1.0ps. Used in automotive infotainment power rails to suppress load dump and ISO 7637-2 transients.
For engineers reviewing the SMAJ51A-13-F datasheet, SMAJ51A-13-F pinout, SMAJ51A-13-F application, or SMAJ51A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 8.3ms half-sine surge, unidirectional polarity alignment with DC bias, and SMA package thermal performance at TL = +75°C.
Technical Context
This TVS operates as a voltage-clamped crowbar device triggered by avalanche breakdown above its 56.7–62.7V breakdown range (VBR @ IT = 1.0mA). Its glass-passivated junction ensures stable leakage (<5.0µA @ VRWM) and repeatable clamping behavior across -55°C to +150°C operating temperature.
Designed for non-repetitive surge suppression, it handles up to 40A peak forward surge (IFSM) and derates linearly above +25°C ambient per Fig. 1. The SMA package supports 1.0W steady-state dissipation at lead temperature TL = +75°C, enabling integration into space-constrained automotive PCB layouts without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 8.3ms half-sine surges without failure |
| Reverse Standoff Voltage | 51V - Maximum continuous DC voltage before significant leakage begins |
| Clamping Voltage | 82.4V @ IPP = 4.9A - Limits downstream voltage during surge to protect 60V-rated components |
| Breakdown Voltage | 56.7–62.7V @ IT = 1.0mA - Avalanche onset range defining turn-on threshold tolerance |
| Leakage Current | <5.0µA @ VRWM - Ensures negligible standby power loss in always-on systems |
| Package | SMA - Surface-mount plastic case (4.00–4.60mm length) with cathode band polarity marking |
| Operating Temp | -55°C to +150°C - Qualified for under-hood automotive environments |
Pinout & Package
SMA package: molded plastic case, UL 94V-0 rated, 0.064g weight, cathode band marking for unidirectional polarity. Moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / surge current sink | Connected to system ground or low-side return; carries full surge current during clamping |
| Cathode | Protected line input / high-side connection | Connected to line being protected (e.g., 12V battery rail); voltage referenced to anode during conduction |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables robust protection against ISO 7637-2 Pulse 5a (load dump) without derating in compact layout |
| Glass passivated die | Ensures long-term reliability and stable VBR/VC parameters across thermal cycling and humidity exposure |
| Fast response time (<1.0ps) | Clamps transients before sensitive downstream ICs experience overvoltage stress |
| RoHS-compliant & halogen-free | Meets automotive ELV and REACH requirements; matte tin plating ensures solderability per MIL-STD-202 |
| SMA footprint compatibility | Direct replacement for industry-standard SMA TVS devices without PCB redesign |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: 12V battery line in vehicle infotainment head unit exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role: Primary clamping element placed between fuse and DC-DC converter input. Use Value: Limits voltage to ≤82.4V during 4.9A surge, protecting 60V-input buck controller and preventing latch-up or gate oxide damage. | Use Scenario: 24V analog sensor signal line (e.g., pressure transducer) in factory automation PLC I/O module. IC Role / Device Role: Line-side transient suppressor on differential pair routed across noisy motor control zones. Use Value: Clamps EFT bursts (IEC 61000-4-4) to safe levels while maintaining <5.0µA leakage to preserve 16-bit ADC reference accuracy. |
| Telecom DC Feeder Protection | Medical Equipment Power Entry |
Use Scenario: -48V DC power feed to remote radio unit in cellular base station cabinet. IC Role / Device Role: Unidirectional TVS on input side of hot-swap controller and upstream of bulk capacitance. Use Value: Absorbs lightning-induced surges (10/1000µs waveform) with 400W rating, avoiding crowbar shutdown during field operation. | Use Scenario: Mains-derived 5V/12V auxiliary supply in portable ultrasound imaging device. IC Role / Device Role: Secondary-level surge clamp after primary MOV, guarding isolated DC-DC feedback path. Use Value: Provides precise 82.4V clamping with tight VBR tolerance (±5.5%) to ensure predictable failure mode per IEC 60601-1 creepage/clearance rules. |
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-E3/5A (Vishay) | Identical VRWM (51V), VC = 82.4V, but higher IR (10µA max @ VRWM) | Less suitable for ultra-low-leakage precision analog front-ends | Select when cost or dual-sourcing drives preference; verify leakage impact on reference stability |
| P6SMB51A (ON Semiconductor) | Same SMA package, but lower PPK = 600W and higher VC = 85.0V @ IPP = 7.0A | Better for higher-energy surges but reduces voltage margin for 60V-rated ICs | Choose where surge energy exceeds 400W requirement and clamping margin allows 85V ceiling |
Compared with SMAJ51A-13-F, SMAJ51A-E3/5A trades tighter leakage control for broader supply chain availability, while P6SMB51A offers higher surge capacity at the expense of clamping voltage margin-critical when protecting components with narrow VCC tolerances.
Availability
SMAJ51A-13-F is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor interfaces, and telecom DC feeder protection requiring stable component supply across extended production cycles.
Supply support for SMAJ51A-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This device belongs to Diodes' SMAJ series of surface-mount TVS diodes, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure applications where AEC-Q101 qualification and PPAP support are required.
FAQ
What is the maximum clamping voltage for SMAJ51A-13-F under standard test conditions?
The maximum clamping voltage (VC) is 82.4V measured at a peak pulse current (IPP) of 4.9A using the 8.3ms half-sine waveform defined in IEC 61000-4-5. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and represents the upper limit of voltage seen by downstream circuitry during surge events.
Is SMAJ51A-13-F suitable for bidirectional signal line protection?
No - SMAJ51A-13-F is unidirectional, indicated by the absence of "C" in the part number. It conducts only when cathode voltage exceeds anode voltage by ≥56.7V. For bidirectional protection (e.g., RS-485, USB D+/D-), use SMAJ51CA-13-F, which clamps symmetrically above and below ground.
How does the SMA package affect thermal performance in continuous operation?
The SMA package delivers 1.0W steady-state power dissipation at TL = +75°C (lead temperature), not ambient. In practice, this requires adequate copper pour (≥100mm² per pad) and minimal trace length to maintain thermal resistance below 75°C/W. Derating begins above +25°C ambient per Fig. 6, reaching ~70% power capability at +85°C ambient.
Does SMAJ51A-13-F meet automotive qualification standards?
The standard SMAJ51A-13-F is not AEC-Q101 qualified. Diodes offers an automotive-compliant version, SMAJ51AQ-13-F, documented separately and manufactured in IATF 16949-certified facilities with PPAP support. For automotive production, specify the "Q" suffix variant and confirm qualification status with Diodes' automotive team.
SMAJ51A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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:
- SMA
SMAJ51A-13-F FAQ
1.How can I place an order for SMAJ51A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51A-13-F 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-13-F reliable?
The price and inventory of SMAJ51A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ51A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51A-13-F?
SMAJ51A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51A-13-F 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-13-F?
For technical support, including SMAJ51A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51A-13-F requirements.
6.How does Aetrix verify that SMAJ51A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ51A-13-F 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-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ51A-13-F?
All SMAJ51A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51A-13-F, 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-13-F part is unused and in its original packaging.
Return procedure for SMAJ51A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51A-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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