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Alpha & Omega Semiconductor Inc. SMDJ85CA
- Part No.:
- SMDJ85CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ85CA.pdf
- Description:
- 1CH 85V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:5,166
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Product details
Overview
SMDJ85CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for high-energy surge protection in DC power lines and data interfaces. It features 85 V reverse standoff voltage (VRWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 21.9 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform.
For engineers reviewing the SMDJ85CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (<2 µA @ 85 V), fast sub-1 ps response time, JEDEC DO-214AB surface-mount compatibility, and MSL1 moisture sensitivity level with lead-free matte tin plating.
Technical Context
The SMDJ85CA operates as a bi-directional avalanche diode, symmetrically clamping transient overvoltages in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
Designed for non-repetitive 10/1000 µs transients at ≤0.01% duty cycle, it delivers 3000 W peak power dissipation when mounted on 8.0 mm × 8.0 mm copper pads, with thermal resistance of 15 °C/W junction-to-lead and 75 °C/W junction-to-ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 85 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 94.4–104 V - Confirmed avalanche onset range ensuring predictable turn-on during surges |
| VC @ IPPM | 137 V - Clamped voltage at 21.9 A peak pulse current, limiting downstream component stress |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity under standardized lightning/surge test waveform |
| IR @ VRWM | <2 µA - Minimal leakage current preserves system efficiency and battery life in standby |
| TJ max / TSTG | −55 to +150 °C - Wide operating and storage temperature range suitable for industrial and automotive environments |
| Response Time | <1.0 ps - Near-instantaneous junction response enables protection of high-speed digital and analog circuits |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package: molded plastic case with solderable matte tin-plated terminals per MIL-STD-750 Method 2026; bidirectional polarity indicated by absence of cathode band (unlike unidirectional variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | No fixed anode/cathode designation; terminals interchangeable for AC or bipolar DC line protection |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation while enabling heat transfer via copper pad mounting |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC lines, differential data buses, or floating DC rails without polarity constraints |
| Glass-passivated junction | Ensures stable VBR tolerance and resistance to humidity-induced parameter drift over lifetime |
| Built-in strain relief | Reduces mechanical stress on solder joints during thermal cycling or board flexure |
| MSL1 rating (J-STD-020) | Supports standard reflow profiles up to 260 °C peak without pre-baking, simplifying SMT assembly |
| UL 94V-0 flammability | Meets safety standards for enclosure-integrated surge protection in certified end equipment |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC power inputs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary bidirectional surge clamp placed upstream of DC-DC converters and microcontroller power rails. Use Value: Limits clamped voltage to 137 V during 3000 W surges, preventing damage to 36 V-rated input stages and maintaining system uptime. | Use Scenario: Surge suppression on LIN bus lines exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point to shunt fast transients before signal conditioning ICs. Use Value: Sub-1 ps response ensures clamping occurs before LIN transceiver input thresholds are exceeded, preserving communication integrity. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: DC power input protection for remote radio units powered over long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamp on −48 V telecom supply rail to absorb induced lightning surges and switching spikes. Use Value: 85 V VRWM matches nominal −48 V system with sufficient margin; 137 V VC prevents overvoltage on downstream PMICs rated for 150 V max. | Use Scenario: DC link surge protection between PV array and MPPT controller in solar inverters. IC Role / Device Role / Timing Role: High-power TVS across DC+ and DC− to clamp grid-switching transients and lightning-induced common-mode surges. Use Value: 3000 W PPPM rating handles IEC 61000-4-5 Level 4 surges; DO-214AB package supports high-current PCB layout with 8 mm² copper pads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85CA (Littelfuse) | Same 85 V VRWM and DO-214AB package; 138 V VC @ 21.5 A; slightly higher IR (5 µA) | Identical bidirectional use case; validated in telecom power designs per Littelfuse application note AN-4002 | Preferred where UL 497B certification for telecom primary protectors is required |
| 1.5KE85CA (ON Semiconductor) | Higher 1.5 kW PPPM rating; axial DO-15 package; 139 V VC @ 10.8 A; not surface-mount | Requires through-hole PCB layout; unsuitable for high-density or automated SMT production | Select only for legacy through-hole systems or cost-sensitive prototyping where rework tolerance outweighs density needs |
Compared with SAC85CA and 1.5KE85CA, the SMDJ85CA offers superior power density (3000 W in SMC vs. 1500 W in DO-15), lower leakage (<2 µA), and full MSL1 reflow compatibility-making it optimal for modern high-reliability SMT power rail protection.
Availability
SMDJ85CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, RoHS-compliant green packaging, and traceable sourcing for production ramp-up.
Supply support for SMDJ85CA 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The SMDJ series is part of AOS's transient voltage suppressor product line, engineered specifically for robust, high-power surface-mount surge protection in space-constrained and thermally demanding applications.
FAQ
What is the clamping voltage of the SMDJ85CA under a 10/1000 µs surge?
The SMDJ85CA exhibits a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 21.9 A on the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMDJ85CA maintains this clamping performance consistently due to its glass-passivated junction and low dynamic impedance.
Is the SMDJ85CA suitable for protecting AC signal lines?
Yes, the SMDJ85CA is explicitly designed for bidirectional operation and is suitable for AC signal line protection such as RS-485, CAN, or audio interfaces. Its symmetrical breakdown characteristic (94.4–104 V in both directions) allows it to clamp overvoltages regardless of polarity. Unlike unidirectional TVS diodes, the SMDJ85CA requires no orientation during placement, simplifying layout for differential or floating AC paths.
Does the SMDJ85CA meet lead-free and RoHS requirements?
Yes, the SMDJ85CA is a certified AOS Green Product: fully RoHS compliant, halogen-free, and features matte tin lead-free plating per J-STD-020 MSL1 specifications. Its packaging and materials comply with EU Directive 2011/65/EU and IPC-1752, and it carries UL 94V-0 flammability rating-making it suitable for environmentally regulated industrial and consumer end equipment.
What is the thermal resistance of the SMDJ85CA, and how does it affect PCB layout?
The SMDJ85CA has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To achieve rated 3000 W pulse power, designers must implement these minimum pad dimensions and consider thermal vias beneath the leads. Reducing pad area increases junction temperature rise, potentially derating surge capability or shortening device lifetime under repeated stress.
How does the SMDJ85CA compare to unidirectional SMDJ85A in terms of circuit implementation?
The SMDJ85CA differs from the unidirectional SMDJ85A solely in polarity configuration: the 'CA' suffix denotes bidirectional operation with no cathode band, while 'A' indicates unidirectional operation with a visible cathode marking. Both share identical VRWM (85 V), VBR (94.4–104 V), VC (137 V), and PPPM (3000 W). Circuit implementation of the SMDJ85CA eliminates polarity-checking during assembly and supports AC-coupled or floating DC topologies where voltage reversal is possible.
SMDJ85CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 21.9A
- Power - Peak Pulse:
- 3000W (3kW)
- 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:
- DO-214AB
SMDJ85CA FAQ
1.How can I place an order for SMDJ85CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ85CA 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 SMDJ85CA reliable?
The price and inventory of SMDJ85CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ85CA is usually 5 days.
3.What payment methods are accepted for SMDJ85CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ85CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ85CA?
SMDJ85CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ85CA 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 SMDJ85CA?
For technical support, including SMDJ85CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ85CA requirements.
6.How does Aetrix verify that SMDJ85CA is sourced from the original manufacturer or authorized distributors?
All SMDJ85CA 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 SMDJ85CA meets industry standards.
7.What is the process for return or replacement of SMDJ85CA?
All SMDJ85CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ85CA, 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 SMDJ85CA part is unused and in its original packaging.
Return procedure for SMDJ85CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ85CA Tags
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