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Diodes Incorporated SMAJ70A-13-F
- Part No.:
- SMAJ70A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70A-13-F.pdf
- Description:
- TVS DIODE 70VWM 113VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:195,324
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Product details
Overview
SMAJ70A-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 70V reverse standoff voltage (VRWM), 77.8–86.0V breakdown range (VBR), 113V maximum clamping voltage (VC) at 3.5A peak pulse current, and operates from –55°C to +150°C - used in automotive body control modules to protect CAN transceiver power rails against ISO 7637-2 load dump surges.
For engineers reviewing the SMAJ70A-13-F datasheet, SMAJ70A-13-F pinout, SMAJ70A-13-F application, or SMAJ70A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC rating, peak pulse current capability under 8.3ms surge waveforms, unidirectional polarity alignment with DC supply topology, and SMA package thermal performance under PCB copper area constraints.
Technical Context
This TVS diode employs glass-passivated junction construction for stable breakdown characteristics and fast response (<1 ns) to transient events. Its unidirectional configuration provides low-leakage forward conduction path while blocking reverse current until clamping threshold is exceeded.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when integrated with appropriate series impedance. Thermal derating follows a linear curve above +25°C ambient, with full 400W pulse power rated only at TA = +25°C and terminal temperature held constant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms half-sine surge without failure under defined test conditions |
| Reverse Standoff Voltage | 70 V - maximum continuous DC or RMS voltage applied without significant leakage current |
| Breakdown Voltage | 77.8–86.0 V @ 1mA - guaranteed conduction onset range defining clamping initiation threshold |
| Clamping Voltage | 113 V @ 3.5A - maximum voltage seen by protected circuit during specified 8.3ms surge event |
| Leakage Current | 5 µA @ 70V - ensures minimal power loss and signal integrity degradation in standby operation |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial environments without derating |
| Package | SMA - surface-mount outline with 2.29–2.92mm height, 4.00–4.60mm length, RoHS-compliant matte tin plating |
Pinout & Package
The SMAJ70A-13-F uses a 2-terminal SMA (DO-214AC) package with cathode band marking on the top surface indicating the cathode terminal. The device has no internal die bonding variations - both terminals are electrically symmetric except for polarity designation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; defines return path for clamped surge current |
| Cathode | Protected line interface | Connected to input power or signal line; conducts avalanche current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against ISO 7637-2 Test Pulse 5a (load dump) in 12V automotive systems |
| Glass-passivated die | Ensures long-term parameter stability and resistance to humidity-induced parameter drift |
| Unidirectional polarity | Prevents reverse-bias leakage in DC-coupled applications while maintaining low forward VF of 3.5V |
| UL 94V-0 molded case | Meets flammability requirements for enclosed automotive and industrial enclosures |
| Moisture sensitivity Level 1 | Allows unlimited floor life before reflow soldering without dry-pack or baking preconditioning |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protects 12V supply rail feeding microcontroller and CAN transceiver in door module against battery load dump transients. IC Role / Device Role: Primary clamping element placed directly across input rail and chassis ground. Use Value: Limits voltage excursion to ≤113V during 100V/350ms load dump event, preserving downstream ICs rated for 130V absolute maximum. | Use Scenario: Shields 24V digital input channel from field-wiring induced surges in factory automation cabinets. IC Role / Device Role: First-stage transient suppression ahead of optocoupler input and series current-limiting resistor. Use Value: Clamps 1kV/500A surge (IEC 61000-4-5) to <120V within 1ns, preventing optocoupler LED overstress and false triggering. |
| DC Power Supply Output Protection | RS-485 Transceiver Interface |
Use Scenario: Safeguards regulated 48V output of telecom power supply against backfeed surges from connected equipment. IC Role / Device Role: Parallel-connected TVS on output terminals, coordinated with upstream OVP circuitry. Use Value: Absorbs up to 400W for 8.3ms without degradation, maintaining output regulation during transient recovery. | Use Scenario: Installed on RS-485 bus lines (A/B) to suppress ESD and lightning-induced common-mode transients. IC Role / Device Role: Bidirectional-capable variant not used; unidirectional SMAJ70A protects VCC-referenced bias networks. Use Value: Provides 113V clamping referenced to local ground, limiting differential stress across transceiver's ±7V common-mode range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA-13-F | Bidirectional version with symmetrical clamping in both polarities; identical VRWM, VBR, VC, and PPK ratings | Required where AC-coupled or dual-polarity signal lines (e.g., Ethernet PHY pairs) need protection without polarity assumptions | Select SMAJ70CA only if bidirectional clamping is required; otherwise SMAJ70A offers lower leakage in DC systems |
| SMBJ70A-13-F | Same electrical specs but in larger SMB (DO-214AA) package with higher thermal mass and 600W peak power rating | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint | Choose SMBJ70A when board layout permits larger package and system-level surge testing exceeds 400W requirement |
Compared with SMAJ70CA-13-F and SMBJ70A-13-F, the SMAJ70A-13-F delivers optimal cost and size efficiency for unidirectional 12–48V DC rail protection where 400W pulse handling suffices and PCB real estate is constrained.
Availability
SMAJ70A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power supplies, and RS-485 communication interfaces requiring stable component supply across production lifecycles.
Supply support for SMAJ70A-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.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability overvoltage protection in automotive, industrial, and communications infrastructure applications where AEC-Q200 compliance and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of SMAJ70A-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 113 V at a peak pulse current (IPP) of 3.5 A, measured using the standard 8.3 ms single half-sine waveform per IEC 61000-4-5. This value represents the upper limit of voltage imposed on the protected circuit during surge conduction and must be compared directly against the absolute maximum voltage rating of downstream components.
Does SMAJ70A-13-F meet automotive qualification standards?
No - SMAJ70A-13-F is the standard industrial-grade variant. For automotive use, Diodes offers the pin- and spec-identical SMAJ70AQ-13-F, which is qualified to AEC-Q200, manufactured in IATF 16949-certified facilities, and supported with PPAP documentation. The "Q" suffix denotes automotive-compliant change control and traceability.
How does the SMA package affect thermal performance in continuous operation?
In steady-state conditions, the SMAJ70A-13-F dissipates up to 1.0 W at TL = +75°C, with linear derating to zero at +150°C lead temperature. Its 0.064 g mass and 2.29–2.92 mm height limit heat spreading; effective thermal management requires ≥100 mm² of 1 oz copper connected to both terminals, especially for applications with repetitive surges.
Can SMAJ70A-13-F be used in bidirectional signal lines like USB or HDMI?
No - SMAJ70A-13-F is unidirectional and will conduct continuously if reverse-biased beyond its forward voltage (~3.5 V), potentially disrupting signal integrity or damaging source drivers. For bidirectional data lines, use the SMAJ70CA-13-F variant or dedicated low-capacitance TVS arrays designed for high-speed interfaces.
SMAJ70A-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):
- 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:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ70A-13-F FAQ
1.How can I place an order for SMAJ70A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70A-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 SMAJ70A-13-F reliable?
The price and inventory of SMAJ70A-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 SMAJ70A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ70A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70A-13-F?
SMAJ70A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70A-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 SMAJ70A-13-F?
For technical support, including SMAJ70A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70A-13-F requirements.
6.How does Aetrix verify that SMAJ70A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ70A-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 SMAJ70A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ70A-13-F?
All SMAJ70A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70A-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 SMAJ70A-13-F part is unused and in its original packaging.
Return procedure for SMAJ70A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70A-13-F Tags
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Diodes Incorporated
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Diodes Incorporated
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