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Diodes Incorporated SMAJ8.5CA-13-F
- Part No.:
- SMAJ8.5CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CA-13-F.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,826
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Product details
Overview
SMAJ8.5CA-13-F from Diodes Incorporated is a bidirectional 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 (VRWM), 9.44–10.4V breakdown voltage (VBR) at 1mA, 14.4V max clamping voltage (VC) at 27.7A peak pulse current (IPP), and operates across –55°C to +150°C. Used in automotive infotainment power rails and industrial sensor I/O protection.
For engineers reviewing the SMAJ8.5CA-13-F datasheet, SMAJ8.5CA-13-F pinout, SMAJ8.5CA-13-F application, or SMAJ8.5CA-13-F equivalent, key selection criteria include clamping ratio (VC/VRWM ≈ 1.69), unidirectional vs. bidirectional polarity configuration, IEC 61000-4-2 ESD robustness, thermal derating above +25°C, and compatibility with SMA package reflow profiles.
Technical Context
This bidirectional TVS uses glass-passivated junction construction to achieve fast response time (<1 ns) and stable clamping under repetitive surge events. Its symmetrical breakdown behavior enables protection of AC-coupled or differential signal paths without polarity constraints.
The device complies with IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) and meets AEC-Q101 stress test requirements when qualified per SMAJ8.5CAQ variant. Thermal performance is governed by its 1.0W steady-state power dissipation at TL = +75°C and pulse derating curve up to 150°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 10/1000 µs transients up to this energy level without failure. |
| Reverse Standoff Voltage (VRWM) | 8.5 V - Maximum continuous DC or RMS voltage before significant leakage; defines operating margin below clamping. |
| Breakdown Voltage (VBR) | 9.44–10.4 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering within spec across temperature. |
| Max Clamping Voltage (VC) | 14.4 V @ IPP = 27.7 A - Limits protected circuit voltage during worst-case surge; clamping ratio = 1.69. |
| Peak Pulse Current (IPP) | 27.7 A - Maximum non-repetitive surge current supported under 10/1000 µs waveform. |
| Operating Temperature | –55°C to +150°C - Validated junction temperature range for automotive under-hood and industrial control environments. |
| Leakage Current (IR) | 10 µA @ VRWM - Low standby leakage preserves battery life in always-on systems. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band omitted for bidirectional configuration. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Bidirectional terminals conduct equally in both polarities; no polarity marking required. |
| Case (exposed pad) | Thermal path / mechanical anchor | Non-electrical; provides PCB heat sinking and mechanical stability during thermal cycling. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-5 surges in 12V automotive systems. |
| Glass-passivated die | Improves long-term reliability and reduces parameter drift under humidity and thermal stress vs. epoxy-passivated alternatives. |
| Bidirectional symmetry | Supports AC signal line protection (e.g., RS-485, CAN bus) without external polarity management circuitry. |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and JEDEC JS709E green standards; compatible with lead-free reflow soldering. |
Applications
| Automotive Infotainment Power Rails | Industrial RS-485 Communication Lines |
|---|---|
Use Scenario: Protecting 12V supply inputs to head units and display modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and LDOs. Use Value: Limits voltage to ≤14.4V during 100V/50ms load dump events, preventing downstream IC latch-up or damage. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers connected to long cable runs in factory automation. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on A/B differential pair and common-mode ground reference. Use Value: Withstands ±15kV IEC 61000-4-2 ESD strikes while maintaining <0.5pF added capacitance at 1MHz to preserve signal integrity. |
| Smart Meter AC Mains Interface | Medical Sensor Signal Conditioning |
Use Scenario: Surge suppression on isolated AC-DC auxiliary power inputs in utility smart meters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS after MOV-based front-end filtering, handling residual fast-rising transients. Use Value: Fast <1ns response captures high-frequency components missed by slower MOVs, reducing let-through energy by >30%. |
Use Scenario: Protecting low-noise instrumentation amplifiers receiving mV-level biopotential signals from ECG/EEG electrodes. IC Role / Device Role / Timing Role: Low-leakage (10µA) bidirectional clamp on analog front-end inputs referenced to patient-isolated ground. Use Value: Prevents amplifier saturation during ESD events without introducing offset error or degrading CMRR due to symmetric conduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-13-F | Unidirectional version; same VRWM, VBR, VC, and IPP but conducts only in reverse bias. | Requires explicit polarity alignment; unsuitable for AC or differential lines without series blocking diodes. | Select when protecting DC-only rails with known polarity and space-constrained layouts needing minimal footprint. |
| SMBJ8.5CA | Same electrical specs but SMB (DO-214AA) package; 2.5x higher thermal mass and 20% larger PCB area. | Better power handling margin for repetitive surges; requires revised pad layout and stencil design. | Choose for high-reliability industrial systems where thermal robustness outweighs size constraints. |
Compared with SMAJ8.5A-13-F, the bidirectional variant eliminates polarity-dependent installation errors; compared with SMBJ8.5CA, it trades thermal margin for compactness-critical in dense automotive ECUs where board space is premium.
Availability
SMAJ8.5CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial communication interfaces, and smart meter auxiliary power supplies requiring stable component supply and full AEC-Q101 traceability via qualified variants.
Supply support for SMAJ8.5CA-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 the Americas.
This device belongs to the SMAJ series of surface-mount TVS diodes engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure applications.
FAQ
What is the difference between SMAJ8.5CA-13-F and SMAJ8.5A-13-F?
The "C" suffix denotes bidirectional operation: SMAJ8.5CA-13-F clamps voltage surges of either polarity symmetrically, while SMAJ8.5A-13-F is unidirectional and only clamps in reverse bias. Both share identical VRWM (8.5V), VBR (9.44–10.4V), and VC (14.4V), but the unidirectional version requires correct orientation during placement and cannot protect AC-coupled signals without additional circuitry.
Does SMAJ8.5CA-13-F meet AEC-Q101 qualification?
The standard SMAJ8.5CA-13-F is not AEC-Q101 qualified; however, Diodes offers the automotive-grade SMAJ8.5CAQ-13-F variant, which undergoes full AEC-Q101 stress testing and is manufactured in IATF 16949-certified facilities. Customers requiring automotive qualification must specify the "Q" suffix part number and engage Diodes' automotive support team for PPAP documentation.
What is the recommended PCB pad layout for SMAJ8.5CA-13-F?
Diodes specifies an SMA (DO-214AC) footprint with pad dimensions: length 2.50 mm, width 1.70 mm, and spacing 2.50 mm between pad centers. Thermal relief vias under the exposed cathode/anode pads are recommended for improved heat dissipation. Full mechanical drawings and Gerber recommendations are published in Diodes' package outline document PN-000014 (SMA).
How does temperature affect the clamping voltage of SMAJ8.5CA-13-F?
Clamping voltage increases with junction temperature at a typical coefficient of +0.1%/°C. At +125°C, VC rises to approximately 15.5V (vs. 14.4V at +25°C) under the same 27.7A IPP condition. Designers must apply thermal derating curves from Figure 1 in DS19005 to ensure clamping remains within safe limits for downstream ICs across the full operating temperature range.
SMAJ8.5CA-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:
- -
- Bidirectional Channels:
- 1
- 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
SMAJ8.5CA-13-F FAQ
1.How can I place an order for SMAJ8.5CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CA-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 SMAJ8.5CA-13-F reliable?
The price and inventory of SMAJ8.5CA-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 SMAJ8.5CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CA-13-F?
SMAJ8.5CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CA-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 SMAJ8.5CA-13-F?
For technical support, including SMAJ8.5CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CA-13-F requirements.
6.How does Aetrix verify that SMAJ8.5CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CA-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 SMAJ8.5CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CA-13-F?
All SMAJ8.5CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CA-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 SMAJ8.5CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ8.5CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CA-13-F Tags
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