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Diodes Incorporated SMAJ85CA-13
- Part No.:
- SMAJ85CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CA-13.pdf
- Description:
- TVS DIODE 85VWM 137VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,561
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Product details
Overview
SMAJ85CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal interfaces. It features a 85V reverse standoff voltage (VRWM), 94.4–104V breakdown range (VBR @ 1mA), 137V max clamping voltage (VC) at 2.9A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature - deployed in industrial power supply input stages and Ethernet PHY protection.
For engineers reviewing the SMAJ85CA-13 datasheet, SMAJ85CA-13 pinout, SMAJ85CA-13 application, or SMAJ85CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC rating, unidirectional/bi-directional polarity match, 400W peak pulse power handling under 8.3ms surge, and SMA package thermal performance in high-density PCB layouts.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junctions to achieve fast response (<1 ps) to ESD and lightning-induced transients. Its symmetrical I-V characteristic enables protection of AC-coupled or floating signal paths without polarity constraints.
Clamping behavior is defined by a controlled avalanche breakdown mechanism with low dynamic impedance (≈47 Ω derived from ΔV/ΔI = (137V − 94.4V)/0.9A), ensuring predictable voltage limiting during 8.3ms half-sine surges up to 2.9A. Steady-state power dissipation is limited to 1.0W at TL = 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge events per JEDEC standard without failure |
| Reverse Standoff Voltage | 85V - maximum continuous DC or RMS voltage before significant leakage |
| Breakdown Voltage | 94.4–104V @ 1mA - guaranteed avalanche onset window for reliable triggering |
| Max Clamping Voltage | 137V @ 2.9A IPP - limits transient voltage seen by downstream circuitry |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive engine bays and industrial enclosures |
| Package | SMA (DO-214AC) - surface-mount footprint with 4.8–5.59mm body length and 2.01–2.30mm terminal spacing |
Pinout & Package
SMA (DO-214AC) package: molded plastic case, UL 94V-0 rated, cathode band omitted (bi-directional), terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional avalanche terminals | Interchangeable; symmetric conduction allows placement without orientation check on PCB |
| Case | Non-electrical mechanical interface | No internal connection; serves only as thermal path and structural support |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| 400W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4kV line-to-line) with appropriate series impedance |
| RoHS-compliant matte tin plating | Supports lead-free reflow profiles (J-STD-020C Level 1 moisture sensitivity) |
| Fast response time | Sub-nanosecond turn-on ensures clamping before sensitive ICs experience overstress |
Applications
| Industrial PLC I/O Protection | Ethernet PHY Port Protection |
|---|---|
Use Scenario: 24V DC field wiring exposed to inductive switching and lightning-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input terminals upstream of signal conditioning circuitry. Use Value: Limits transients to ≤137V, protecting 30V-rated analog front-end amplifiers and isolation barriers. | Use Scenario: 10/100BASE-TX Ethernet ports connected to unshielded outdoor cabling. IC Role / Device Role / Timing Role: Bi-directional TVS on differential pairs (MDI/MDIX) to absorb ESD and surge energy before magnetics. Use Value: Symmetric clamping preserves common-mode rejection while meeting IEC 61000-4-2 ±15kV contact discharge. |
| Automotive Body Control Module | DC Power Rail Surge Suppression |
Use Scenario: 12V battery-supplied microcontroller inputs interfacing with door lock actuators and sensor harnesses. IC Role / Device Role / Timing Role: Secondary protection device after fuse and primary LC filter, guarding against load dump spikes. Use Value: Withstands 137V clamping at 2.9A, compatible with ISO 7637-2 Pulse 5a (load dump) waveform tail. | Use Scenario: 48V telecom or server power distribution board with hot-swap controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS on main rail to shunt transient energy during MOSFET switching faults. Use Value: 400W rating handles short-duration 50–100A surges when coordinated with upstream fusing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-13 | Same VRWM/VBR/VC specs but SMB (DO-214AA) package - 3.5mm wider body, higher thermal mass | Better steady-state power handling (1.5W vs. 1.0W), suited for higher ambient temp environments | Select when board space permits larger footprint and thermal derating margin is critical |
| SMCJ85CA-13 | Same electrical specs in SMC (DO-214AB) package - 7.1mm x 6.2mm, 1.5W PM(AV) | Higher peak power capability (1500W) and improved heat dissipation for repetitive surge scenarios | Choose for applications requiring >400W pulse robustness or frequent surge exposure |
Compared with SMBJ85CA-13 and SMCJ85CA-13, SMAJ85CA-13 offers the smallest PCB footprint and lowest profile among 85V bi-directional TVS diodes in the SMA/SMB/SMC family, making it optimal for space-constrained designs where 400W single-event surge protection suffices.
Availability
SMAJ85CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, Ethernet PHY port hardening, and automotive body control module designs requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ85CA-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 and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in industrial, automotive, and communications infrastructure applications.
FAQ
What does the "C" suffix in SMAJ85CA-13 indicate?
The "C" denotes bi-directional configuration: both terminals exhibit identical avalanche breakdown behavior, enabling use on AC signals or floating nodes without polarity concerns. Unlike unidirectional variants (e.g., SMAJ85A-13), it lacks a cathode band marking and supports symmetrical clamping above ±85V.
How is the 137V clamping voltage measured and what does it imply for circuit design?
The 137V value is the maximum voltage measured across the device when subjected to a 2.9A 8.3ms half-sine surge current (IPP). Designers must ensure that all downstream components have voltage ratings exceeding this clamping level, plus margin, to avoid damage during transient events.
Can SMAJ85CA-13 be used in parallel for higher surge current handling?
No - paralleling TVS diodes without matched VBR and dynamic impedance causes current imbalance and premature failure. For higher IPP, select a single device with higher rating (e.g., SMCJ85CA-13) or implement external current-sharing resistors with careful thermal analysis.
Is the SMAJ85CA-13 suitable for protecting USB or HDMI data lines?
No - its 137V clamping voltage and ~100pF junction capacitance (at 0V) are incompatible with high-speed digital interfaces requiring sub-5V clamping and <1pF capacitance. Use dedicated low-capacitance TVS arrays (e.g., D3V3Z5U-7) instead.
SMAJ85CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- 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
SMAJ85CA-13 FAQ
1.How can I place an order for SMAJ85CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CA-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 SMAJ85CA-13 reliable?
The price and inventory of SMAJ85CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ85CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CA-13?
SMAJ85CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CA-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 SMAJ85CA-13?
For technical support, including SMAJ85CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CA-13 requirements.
6.How does Aetrix verify that SMAJ85CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ85CA-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 SMAJ85CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ85CA-13?
All SMAJ85CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CA-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 SMAJ85CA-13 part is unused and in its original packaging.
Return procedure for SMAJ85CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85CA-13 Tags
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ESD9B5.0ST5G
onsemi
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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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Diodes Incorporated
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