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Alpha & Omega Semiconductor Inc. SMDJ26CA
- Part No.:
- SMDJ26CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ26CA.pdf
- Description:
- 1CH 26V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:5,042
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Product details
Overview
SMDJ26CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 26 V reverse standoff voltage (VRWM), 28.9–31.9 V breakdown voltage (VBR), 42.1 V maximum clamping voltage (VC) at 71.3 A peak pulse current, and 3000 W peak pulse power on 10/1000 µs waveform - deployed for surge protection in DC power rails and I/O interfaces of industrial motor drives.
For engineers reviewing the SMDJ26CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low thermal resistance (RθJL = 15 °C/W), JEDEC-compliant DO-214AB surface-mount packaging, and compliance with MSL Level 1 reflow profile (260 °C peak).
Technical Context
The SMDJ26CA operates as a silicon avalanche diode optimized for fast transient suppression, with sub-1 ps response time from 0 V to breakdown and bidirectional conduction symmetry enabling use in AC-coupled or floating signal lines without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (≤2 µA @ VRWM).
Thermal performance is defined by RθJA = 75 °C/W (on standard 8 mm × 8 mm copper pads) and RθJL = 15 °C/W, supporting high-reliability operation up to TJ = 150 °C. The device meets UL 94V-0 flammability and RoHS/Halogen-free requirements per AOS Green Policy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1A | 28.9–31.9 V - Confirmed avalanche onset range ensuring predictable turn-on under surge |
| VC @ IPPM | 42.1 V - Clamped voltage at 71.3 A peak pulse current, defining worst-case protected line voltage |
| PPPM (10/1000µs) | 3000 W - Peak transient energy handling capacity on standardized surge waveform |
| TJ max | +150 °C - Maximum junction temperature enabling operation in high-ambient industrial environments |
| Polarity | Bi-directional - Symmetric clamping in both directions, eliminating need for polarity-aware layout |
| Package | DO-214AB (SMC J-Bend) - Standardized surface-mount outline with strain relief and matte tin lead-free plating |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with J-bend leads, cathode indicated by color band (not applicable for bi-directional SMDJ26CA); terminals are solderable per MIL-STD-750 Method 2026; meets MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional avalanche junction terminals | No functional polarity - either terminal serves as anode or cathode depending on transient polarity; symmetric IV curve |
| Case | Non-electrical mechanical structure | Plastic body provides strain relief and UL 94V-0 flame resistance; no thermal or electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before transient energy couples into downstream circuitry |
| Clamping ratio (VC/VBR) | 1.31–1.46 - Low overvoltage margin ensures tight protection window for 24 V systems |
| Thermal resistance (Junction-to-Lead) | 15 °C/W - Supports high pulse repetition rates when mounted on PCB copper pour |
| MSL Level 1 rating | Peak reflow temperature 260 °C - Compatible with standard lead-free SMT assembly without pre-baking |
| Glass passivated junction | Stable VBR drift <0.1% × VBR/°C - Ensures long-term clamping consistency across temperature |
Applications
| Industrial Motor Drive Power Input | RS-485 Data Line Protection |
|---|---|
Use Scenario: 24 V DC bus input subjected to load dump and inductive switching transients in variable frequency drives. IC Role / Device Role / Timing Role: Primary TVS clamp placed upstream of DC-DC converters and gate drivers to limit voltage excursions to ≤42.1 V. Use Value: Prevents damage to MOSFETs and controllers during 3000 W surges while maintaining system uptime via robust 150 °C junction rating. | Use Scenario: Bidirectional differential data lines exposed to ESD and lightning-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Symmetric clamping element across A/B lines, referenced to common-mode ground, absorbing ±15 kV contact ESD per IEC 61000-4-2. Use Value: Eliminates need for two unidirectional devices; maintains signal integrity with <1 pF junction capacitance at 1 MHz. |
| Uninterruptible Power Supply (UPS) Battery Interface | Outdoor LED Streetlight DC Distribution |
Use Scenario: 24–48 V battery backup interface vulnerable to reverse battery connection and surge coupling from AC mains. IC Role / Device Role / Timing Role: Bidirectional overvoltage protector between battery terminals and charging controller ICs. Use Value: Withstands 300 A surge (8.3 ms half-sine) and clamps reversals to safe levels without latch-up or degradation. | Use Scenario: Outdoor-rated LED driver inputs exposed to induced surges from nearby lightning strikes on utility poles. IC Role / Device Role / Timing Role: First-line transient suppressor on DC input before bulk capacitor and PWM controller. Use Value: Delivers 3000 W surge immunity with UL 94V-0 housing and -55 °C to +150 °C operational range for harsh ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ26CA | Same DO-214AC package (slightly smaller than DO-214AB); VRWM = 26 V, VC = 42.1 V, PPPM = 400 W (lower than SMDJ26CA's 3000 W) | Rated for lower-energy transients; unsuitable for load-dump or high-current surge scenarios | Select SMAJ26CA only for space-constrained designs where peak power demand is ≤400 W |
| ON Semiconductor 1.5KE27CA | Through-hole DO-15 package; same VRWM and VC, but PPPM = 1500 W (50% of SMDJ26CA); higher RθJA due to leaded construction | Requires through-hole assembly; not compatible with automated SMT lines or high-density layouts | Choose 1.5KE27CA only for legacy through-hole systems or prototyping where reflow compatibility is not required |
Compared with SMAJ26CA and 1.5KE27CA, the SMDJ26CA delivers 7.5× higher peak pulse power and DO-214AB surface-mount compatibility - making it the sole option among the three qualified for high-energy industrial surge standards like ISO 7637-2 Pulse 5a.
Availability
SMDJ26CA is available at Aetrix Electronics and suitable for industrial motor drives, RS-485 communication interfaces, and outdoor LED lighting systems requiring stable component supply and full traceability across production batches.
Supply support for SMDJ26CA 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 modules for industrial, computing, and consumer applications.
The SMDJ series is designed specifically for high-power transient suppression in ruggedized DC power systems - emphasizing low clamping ratio, JEDEC-standard SMT packaging, and extended temperature reliability.
FAQ
What is the maximum clamping voltage of the SMDJ26CA under a 10/1000 µs surge?
The SMDJ26CA exhibits a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 71.3 A on the 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within absolute maximum ratings.
Is the SMDJ26CA suitable for bidirectional signal line protection?
Yes, the SMDJ26CA is explicitly designed as a bi-directional TVS diode, with identical electrical characteristics in both polarities. Its symmetrical breakdown behavior enables direct placement across differential pairs (e.g., RS-485 A/B lines) or floating DC buses without polarity constraints - confirmed by AOS documentation stating "Electrical characteristics apply in both directions" for CA-suffix parts.
What is the thermal resistance from junction to lead (RθJL) for the SMDJ26CA?
The SMDJ26CA has a typical thermal resistance from junction to lead (RθJL) of 15 °C/W, measured under standard mounting conditions. This low value supports efficient heat transfer from the silicon die to the PCB copper via the leads, enabling reliable operation during repetitive surge events and contributing to its 150 °C maximum junction temperature rating.
Does the SMDJ26CA meet lead-free reflow requirements?
Yes, the SMDJ26CA is qualified for lead-free reflow soldering per J-STD-020, achieving MSL Level 1 classification with a maximum peak temperature of 260 °C. Its matte tin lead-free plating and DO-214AB package construction ensure compatibility with standard SMT assembly processes without requiring pre-baking or special handling.
How does the SMDJ26CA compare to unidirectional SMDJ26A in circuit implementation?
The SMDJ26CA differs from the unidirectional SMDJ26A solely in polarity configuration: SMDJ26CA provides symmetrical clamping for AC or floating nodes, while SMDJ26A requires correct cathode orientation relative to DC bias. Both share identical VRWM (26 V), VBR (28.9–31.9 V), VC (42.1 V), and PPPM (3000 W) - so the choice depends strictly on whether the protected node references ground or operates differentially.
SMDJ26CA 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 71.3A
- 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
SMDJ26CA FAQ
1.How can I place an order for SMDJ26CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ26CA 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 SMDJ26CA reliable?
The price and inventory of SMDJ26CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ26CA is usually 5 days.
3.What payment methods are accepted for SMDJ26CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ26CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ26CA?
SMDJ26CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ26CA 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 SMDJ26CA?
For technical support, including SMDJ26CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ26CA requirements.
6.How does Aetrix verify that SMDJ26CA is sourced from the original manufacturer or authorized distributors?
All SMDJ26CA 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 SMDJ26CA meets industry standards.
7.What is the process for return or replacement of SMDJ26CA?
All SMDJ26CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ26CA, 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 SMDJ26CA part is unused and in its original packaging.
Return procedure for SMDJ26CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ26CA Tags
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