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Diodes Incorporated SMAJ8.5A-13-F
- Part No.:
- SMAJ8.5A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5A-13-F.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:36,969
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Product details
Overview
SMAJ8.5A-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 8.5V reverse standoff voltage, 9.44–10.4V breakdown voltage at 1mA test current, 14.4V max clamping voltage at 27.7A peak pulse current, and SMA package with cathode band polarity indicator.
For engineers reviewing the SMAJ8.5A-13-F datasheet, SMAJ8.5A-13-F pinout, SMAJ8.5A-13-F application, or SMAJ8.5A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under IEC 61000-4-5 surge conditions, thermal derating above +25°C ambient, and compatibility with automated SMT reflow profiles for high-reliability industrial and automotive PCBs.
Technical Context
This TVS operates as a clamping device that remains non-conductive below VRWM (8.5V), then rapidly avalanches to limit transient voltages across protected circuit nodes. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<10µA at VRWM).
The device responds within <1ns to ESD and lightning-induced surges, delivering 400W peak pulse power dissipation (8/20µs waveform) while maintaining steady-state power handling of 1.0W at TL = +75°C. Thermal performance is defined by TJ range of –55°C to +150°C and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8/20µs transients up to this energy without failure |
| Reverse Standoff Voltage | 8.5V - maximum continuous DC voltage before significant leakage begins |
| Breakdown Voltage | 9.44–10.4V @ 1mA - precise avalanche onset range enabling predictable clamping threshold |
| Max Clamping Voltage | 14.4V @ 27.7A - limits voltage seen by downstream ICs during worst-case surge events |
| Peak Pulse Current | 27.7A - maximum surge current the device can safely divert without degradation |
| Leakage Current | ≤10µA @ 8.5V - negligible standby power loss and minimal impact on high-impedance circuits |
| Operating Temperature | –55°C to +150°C - supports deployment in under-hood automotive, industrial controls, and outdoor electronics |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking for unidirectional polarity identification, 0.064g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected line ground or return path | Completes conduction path during avalanche; must be routed with low-inductance trace to minimize clamping overshoot |
| Cathode | High-side connection to protected line (e.g., VIN, signal) | Marked with band; connects to node requiring overvoltage protection; defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures consistent breakdown voltage tolerance and long-term reliability under thermal cycling |
| 400W peak pulse power rating | Meets IEC 61000-4-5 Level 4 (4kV surge) requirements for industrial and automotive front-end protection |
| Fast response time (<1ns) | Clamps transients before sensitive downstream components experience damaging overvoltage |
| Lead-free, RoHS-compliant plating | Matte tin finish enables compatibility with Pb-free reflow soldering and meets global environmental compliance mandates |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or baking prior to assembly-reduces manufacturing overhead |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 12V DC input rail of programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary clamping TVS placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤14.4V, preventing damage to 16V-rated input capacitors and controller ICs. | Use Scenario: LIN bus line in door module subjected to ESD and battery reversal transients. IC Role / Device Role: Unidirectional TVS on LIN TX/RX line referenced to chassis ground. Use Value: Suppresses ±8kV contact ESD (IEC 61000-4-2) while adding <0.5pF capacitance to preserve signal integrity. |
| Telecom PoE Interface | Medical Sensor Signal Line |
Use Scenario: 48V Power over Ethernet (PoE) data pair protection against induced surges. IC Role / Device Role: Bidirectional-capable variant used in differential mode clamp configuration. Use Value: Withstands 100A 8/20µs surge per IEC 61000-4-5 while maintaining <1% voltage imbalance between pairs. | Use Scenario: Analog output line of patient-monitoring temperature sensor connected to isolation barrier. IC Role / Device Role: Low-leakage (≤10µA) TVS on 0–5V output to protect ADC input. Use Value: Prevents latch-up in precision op-amp buffer without introducing offset error or drift due to leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA-13-F | Bidirectional version; symmetric clamping for AC or floating signal lines | Required where polarity reversal or bidirectional transients occur (e.g., RS-485, USB D+/D–) | Select when protecting differential or AC-coupled signals; not interchangeable with unidirectional SMAJ8.5A-13-F without circuit review |
| SMBJ8.5A-13-F | Same electrical specs but SMB package (higher PPK = 600W, larger footprint) | Better suited for higher-energy surges or designs with relaxed board space constraints | Choose for enhanced surge margin where PCB area allows; requires pad layout redesign |
Compared with SMAJ8.5CA-13-F and SMBJ8.5A-13-F, the SMAJ8.5A-13-F offers optimal balance of compact SMA footprint, 400W surge capability, and unidirectional clamping for cost-sensitive 12V/24V DC rail protection-making it preferred for space-constrained industrial and automotive modules where polarity is fixed.
Availability
SMAJ8.5A-13-F is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom PoE interfaces, and medical sensor signal lines requiring stable component supply and full traceability.
Supply support for SMAJ8.5A-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 product line, engineered specifically for robust, surface-mount overvoltage protection in automotive, industrial, and communications equipment operating under harsh EMC environments.
FAQ
What is the maximum clamping voltage of SMAJ8.5A-13-F at its rated peak pulse current?
The maximum clamping voltage is 14.4V at 27.7A peak pulse current (8/20µs waveform), measured per IEC 61000-4-5 test conditions. This value represents the upper bound of voltage imposed on protected circuitry during worst-case surge events and is guaranteed across the full operating temperature range of –55°C to +150°C.
Can SMAJ8.5A-13-F be used in bidirectional signal protection applications?
No-SMAJ8.5A-13-F is a unidirectional TVS diode with cathode-band polarity marking and asymmetric IV characteristics. For bidirectional protection (e.g., RS-232, CAN, or AC-coupled lines), the SMAJ8.5CA-13-F variant must be used, which provides symmetrical clamping in both polarities and omits the cathode band marking.
What is the thermal derating behavior above +25°C ambient?
Peak pulse power derates linearly from 100% at +25°C to approximately 50% at +100°C, as shown in Figure 1 of DS19005 Rev. 19–2. Steady-state power dissipation is limited to 1.0W at TL = +75°C and decreases further at higher lead temperatures, requiring appropriate copper pour and thermal vias for sustained operation.
Is SMAJ8.5A-13-F qualified for automotive applications per AEC-Q101?
No-the standard SMAJ8.5A-13-F is not AEC-Q101 qualified. Diodes offers an automotive-grade variant designated SMAJ8.5AQ-13-F, manufactured in IATF 16949-certified facilities and qualified to AEC-Q101 stress test requirements, with full PPAP documentation available upon request.
SMAJ8.5A-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.7A
- 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
SMAJ8.5A-13-F FAQ
1.How can I place an order for SMAJ8.5A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5A-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 SMAJ8.5A-13-F reliable?
The price and inventory of SMAJ8.5A-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 SMAJ8.5A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ8.5A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5A-13-F?
SMAJ8.5A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5A-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 SMAJ8.5A-13-F?
For technical support, including SMAJ8.5A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5A-13-F requirements.
6.How does Aetrix verify that SMAJ8.5A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5A-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 SMAJ8.5A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ8.5A-13-F?
All SMAJ8.5A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5A-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 SMAJ8.5A-13-F part is unused and in its original packaging.
Return procedure for SMAJ8.5A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5A-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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