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Diodes Incorporated SMAJ70A-13
- Part No.:
- SMAJ70A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70A-13.pdf
- Description:
- TVS DIODE 70VWM 113VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,716
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Product details
Overview
SMAJ70A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 70V reverse standoff voltage (VRWM), 77.8–86.0V breakdown voltage (VBR) at 1mA, 113V maximum clamping voltage (VC) at 3.5A peak pulse current (IPP), and operates from –55°C to +150°C - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ70A-13 datasheet, SMAJ70A-13 pinout, SMAJ70A-13 application, or SMAJ70A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, 8.3ms surge current handling (40A IFSM), unidirectional polarity requirement, and SMA package thermal performance under sustained ambient conditions up to 75°C.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1ps) to ESD and lightning-induced transients. Its unidirectional configuration provides low-leakage forward conduction path while blocking reverse voltage up to 70V until breakdown triggers clamping.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when properly laid out with minimal trace inductance. Clamping action begins at VBR and sustains energy dissipation within its 400W peak pulse rating for defined 8.3ms half-sine wave pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge events without failure under JEDEC test conditions |
| Reverse Standoff Voltage | 70V - maximum continuous DC voltage before leakage exceeds 5µA; sets upper limit for protected line operating voltage |
| Breakdown Voltage | 77.8–86.0V @ 1mA - defines onset of avalanche conduction; tight tolerance enables predictable clamping threshold |
| Clamping Voltage | 113V @ 3.5A IPP - maximum voltage seen by downstream circuit during specified transient; determines required IC overvoltage margin |
| Peak Forward Surge Current | 40A @ 8.3ms - handles high-energy surges common in 12V/24V automotive and industrial systems |
| Operating Temperature | –55°C to +150°C - supports deployment in under-hood automotive, motor drives, and outdoor power equipment |
Pinout & Package
Package: SMA (DO-214AC), surface-mount plastic case with cathode band marking; dimensions: 4.00–4.60mm length × 2.29–2.92mm width × 1.27–1.63mm height; UL 94V-0 rated; weight ≈ 0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration; conducts during positive transients on cathode side |
| Cathode | Protected line connection | Connected to line being protected (e.g., 12V rail); blocks 70V DC, clamps transients above VBR to ≤113V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable breakdown characteristics and long-term reliability under thermal cycling and humidity stress |
| 400W peak pulse rating | Provides robust protection against IEC 61000-4-5 Level 4 (4kV/2Ω) surges in compact SMA footprint |
| Fast response time | <1 ps junction response enables clamping before sensitive downstream logic or analog circuits are overstressed |
| RoHS-compliant finish | Matte tin lead plating meets EU Directive 2011/65/EU with exemptions applied per Annexes V & VII |
Applications
| Automotive Body Control Module | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery-supplied microcontroller inputs exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input pin and ground to clamp transients exceeding 70V. Use Value: Limits voltage to ≤113V during 3.5A surge, protecting 5V/3.3V logic inputs with ≥40V safety margin. | Use Scenario: 24V digital input channel in programmable logic controller subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact interface, upstream of optocoupler input stage. Use Value: Absorbs 400W surge energy without degradation, maintaining signal integrity across 100,000+ switching cycles. |
| DC Power Supply Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Front-end protection for 48V telecom power supply rectifier output. IC Role / Device Role / Timing Role: Secondary clamping device after MOV, limiting residual overshoot to safe levels for downstream DC-DC converters. Use Value: Clamps to 113V with <5µA leakage at 70V, minimizing standby power loss while ensuring fast turn-on. | Use Scenario: Overvoltage protection on RS-485 data lines in outdoor base station cabinets. IC Role / Device Role / Timing Role: Bidirectional-capable variant (SMAJ70CA-13) used; this unidirectional part applies to DC-biased signal lines. Use Value: Provides 77.8–86.0V controlled breakdown with ±5% tolerance, enabling precise coordination with system-level surge thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-TP from Microchip | Same VRWM (70V), identical SMA package, but 115V VC @ 3.5A (vs. 113V) and 38A IFSM (vs. 40A) | Marginally higher clamping voltage reduces protection margin for 3.3V logic interfaces | Select when sourcing diversification is required and 2V VC increase is acceptable in system margin analysis |
| P6SMB70A from ON Semiconductor | Same 70V VRWM and SMA package, but 400W rating achieved at 10× longer 10/1000µs waveform; VC = 115V @ 3.5A | Optimized for longer-duration surges; less effective for sub-microsecond ESD events due to slower junction response | Prefer for AC-coupled or high-impedance signal lines where waveform duration dominates over speed |
Compared with SMAJ70A-13, SMAJ70A-TP offers tighter supply-chain redundancy with near-identical specs, while P6SMB70A trades faster response for higher energy handling in longer transients - making SMAJ70A-13 optimal for fast, high-current DC rail protection.
Availability
SMAJ70A-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O channels, DC power supply input stages, and telecom line card designs requiring stable component supply and full RoHS compliance.
Supply support for SMAJ70A-13 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 the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in harsh-environment applications including automotive, industrial automation, and communications infrastructure.
FAQ
What is the maximum clamping voltage of SMAJ70A-13 and at what test condition is it specified?
The maximum clamping voltage is 113V, measured at a peak pulse current (IPP) of 3.5A using an 8.3ms single half-sine-wave transient waveform per JEDEC standard. This value represents the highest voltage imposed on the protected circuit during a standardized surge event and must be compared directly against the absolute maximum ratings of downstream components.
Is SMAJ70A-13 suitable for bidirectional signal line protection?
No - SMAJ70A-13 is unidirectional and intended for DC-biased lines where the cathode connects to the protected voltage rail and the anode to ground. For bidirectional protection (e.g., RS-485, USB), the variant SMAJ70CA-13 must be used, which omits the cathode band and supports symmetrical clamping in both polarities.
How does the SMA package affect thermal performance in continuous operation?
The SMA package has a junction-to-lead thermal resistance (RθJL) of approximately 15°C/W. At TL = 75°C, its steady-state power dissipation is limited to 1.0W. In PCB layouts, copper pour under the cathode/anode pads and thermal vias significantly improve heat spreading, allowing sustained operation near rated ambient limits without derating.
Does SMAJ70A-13 meet automotive qualification standards such as AEC-Q200?
No - SMAJ70A-13 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and is widely used in automotive applications, Diodes Incorporated does not list this specific part number under its AEC-Q200-certified TVS portfolio. For AEC-Q200-compliant alternatives, consider the D3V3F4UQ series or contact Diodes' automotive support team for qualified equivalents.
SMAJ70A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ70A-13 FAQ
1.How can I place an order for SMAJ70A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70A-13 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 SMAJ70A-13 reliable?
The price and inventory of SMAJ70A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ70A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70A-13?
SMAJ70A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70A-13 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 SMAJ70A-13?
For technical support, including SMAJ70A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70A-13 requirements.
6.How does Aetrix verify that SMAJ70A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ70A-13 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 SMAJ70A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ70A-13?
All SMAJ70A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70A-13, 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 SMAJ70A-13 part is unused and in its original packaging.
Return procedure for SMAJ70A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70A-13 Tags
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