My Inquiry
My Account
Alpha & Omega Semiconductor Inc. SMDJ26A
- Part No.:
- SMDJ26A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ26A.pdf
- Description:
- 1CH 26V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,729
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ26A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 26.0 V reverse standoff voltage (VRWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 42.1 V maximum clamping voltage at 71.3 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives to protect IGBT gate drivers from inductive switching transients.
For engineers reviewing the SMDJ26A datasheet, pinout, applications, or equivalent options, key selection criteria include unidirectional polarity, DO-214AB package compatibility with high-current PCB layouts, clamping performance under repetitive 0.01% duty cycle surges, and thermal resistance (RθJL = 15 °C/W) for sustained operation up to 150 °C junction temperature.
Technical Context
The SMDJ26A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-1 ps response time from 0 V to breakdown, while its low-profile DO-214AB (SMC J-Bend) package supports surface-mount assembly with strain relief and matte tin lead-free plating compliant with J-STD-020 MSL Level 1.
Electrical behavior is defined by strict unidirectional conduction: cathode band marking denotes polarity; reverse leakage remains ≤2.0 µA at VRWM = 26.0 V; and thermal derating follows a linear curve from 3000 W at 25 °C ambient down to zero at 175 °C lead temperature, based on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 28.9–31.9 V - Confirmed avalanche onset range ensuring reliable triggering margin |
| Vc @ IPPM | 42.1 V - Clamped voltage at 71.3 A peak pulse current, limiting downstream stress |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity for lightning or ESD events |
| TJ max | +150 °C - Maximum junction temperature enabling use in enclosed industrial enclosures |
| RθJL | 15 °C/W - Low thermal resistance from junction to lead, critical for pulsed-power reliability |
| IR @ VRWM | ≤2.0 µA - Minimal leakage preserving efficiency in low-power standby circuits |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with J-bend leads; cathode indicated by color band; terminals solderable per MIL-STD-750 Method 2026; RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit during reverse clamping | Marked with band; tied to protected line (e.g., 24 V rail) to shunt surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps from 0 V to VBR - ensures clamping initiates before sensitive ICs experience overvoltage |
| Glass passivated junction | Enhanced reliability and stable VBR over lifetime vs. epoxy-passivated alternatives |
| Built-in strain relief | Reduces mechanical stress on solder joints during thermal cycling or board flexure |
| MSL Level 1 rating | Compatible with standard reflow profiles up to 260 °C peak, eliminating pre-bake requirements |
| UL 94V-0 flammability | Self-extinguishing plastic housing meets safety standards for enclosed power systems |
Applications
| Industrial Motor Drives | Programmable Logic Controllers (PLCs) |
|---|---|
Use Scenario: Protection of 24 V DC control inputs against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and chassis ground to clamp transients exceeding 26 V. Use Value: Limits clamped voltage to 42.1 V at 71.3 A, preventing damage to optocoupler input stages and microcontroller GPIOs. | Use Scenario: Surge suppression on RS-485 communication ports exposed to field wiring noise and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMDJ26A used on single-ended supply rails feeding isolated transceivers. Use Value: 3000 W peak power rating absorbs multiple 10/1000 µs surges without degradation, supporting long-term field deployment. |
| Uninterruptible Power Supplies (UPS) | Automotive Body Control Modules (BCM) |
Use Scenario: Input-stage protection for 24 V battery-backed DC-DC converters subjected to load dump pulses. IC Role / Device Role / Timing Role: Primary clamping device on main DC input rail, coordinated with upstream fuses. Use Value: 150 °C max junction temperature and 15 °C/W thermal resistance enable stable operation during extended overload conditions. | Use Scenario: Protection of LIN bus power supply lines (typically 12 V nominal) against jump-start transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS selected for 26 V VRWM to provide margin above 16 V max system voltage. Use Value: Tight VBR tolerance (28.9–31.9 V) ensures consistent clamping onset across production lots, reducing validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC26 | Same VRWM (26 V) and PPPM (3000 W), but DO-214AA package with higher RθJA (85 °C/W vs. 75 °C/W) | Lower thermal performance limits use in high-ambient or high-duty-cycle environments | Select only if DO-214AA footprint is fixed and thermal margins exceed 20 °C |
| 1.5KE27A | Through-hole TO-218 package; identical electrical specs but 3× larger footprint and no MSL1 rating | Not suitable for automated SMT lines; requires wave soldering or hand assembly | Choose only for legacy through-hole designs where rework cost outweighs performance trade-offs |
Compared with SAC26 and 1.5KE27A, the SMDJ26A delivers superior manufacturability via J-STD-020 MSL1 compliance, lower thermal resistance (RθJL = 15 °C/W), and optimized surface-mount geometry - making it the preferred choice for new industrial and automotive PCB designs requiring high-reliability surge immunity.
Availability
SMDJ26A is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers (PLCs), and uninterruptible power supplies (UPS) requiring stable component supply with full traceability and lifecycle management.
Supply support for SMDJ26A 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 industrial, computing, and automotive markets.
The SMDJ series is engineered specifically for high-power transient suppression in harsh environments - emphasizing robust clamping, low leakage, and surface-mount reliability across wide temperature ranges.
FAQ
What is the maximum clamping voltage of the SMDJ26A under a 10/1000 µs surge?
The SMDJ26A has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 71.3 A on a 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 like microcontrollers or gate drivers remain within safe operating limits. The SMDJ26A maintains this clamping performance consistently across its qualified temperature range.
Is the SMDJ26A suitable for bidirectional surge protection?
No, the SMDJ26A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, the correct variant is SMDJ26CA - which provides symmetrical clamping in both polarities. Using SMDJ26A in a bidirectional configuration would result in forward conduction during negative transients, potentially causing failure. Always verify polarity designation in the part number and schematic placement before design-in.
What is the thermal resistance from junction to lead (RθJL) for the SMDJ26A?
The SMDJ26A has a typical thermal resistance from junction to lead (RθJL) of 15 °C/W, measured with recommended 8.0 mm × 8.0 mm copper pads per terminal. This low value enables efficient heat transfer from the silicon die to the PCB copper, supporting reliable operation at elevated ambient temperatures and under repetitive surge conditions. It directly impacts maximum allowable power dissipation and must be accounted for in thermal layout planning for the SMDJ26A.
Does the SMDJ26A meet lead-free and RoHS requirements?
Yes, the SMDJ26A is a green product per AOS specifications: it is lead-free, RoHS compliant, and halogen-free, with matte tin lead finish meeting J-STD-020 MSL Level 1 reflow requirements (peak temperature 260 °C). These attributes ensure compatibility with modern environmental regulations and automated assembly processes - confirming that the SMDJ26A satisfies both regulatory and manufacturing readiness criteria for global electronics production.
What is the reverse leakage current specification for the SMDJ26A at rated VRWM?
The SMDJ26A exhibits a maximum reverse leakage current (IR) of 2.0 µA when biased at its rated reverse standoff voltage (VRWM) of 26.0 V and ambient temperature of 25 °C. This low leakage preserves power efficiency in always-on circuits and prevents false triggering in high-impedance sensing nodes. The specification is verified per AOS datasheet Rev. 1.2 and applies to all units within the qualified production lot of the SMDJ26A.
SMDJ26A 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:
- 1
- Bidirectional Channels:
- -
- 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
SMDJ26A FAQ
1.How can I place an order for SMDJ26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ26A 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 SMDJ26A reliable?
The price and inventory of SMDJ26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ26A is usually 5 days.
3.What payment methods are accepted for SMDJ26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ26A?
SMDJ26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ26A 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 SMDJ26A?
For technical support, including SMDJ26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ26A requirements.
6.How does Aetrix verify that SMDJ26A is sourced from the original manufacturer or authorized distributors?
All SMDJ26A 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 SMDJ26A meets industry standards.
7.What is the process for return or replacement of SMDJ26A?
All SMDJ26A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ26A, 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 SMDJ26A part is unused and in its original packaging.
Return procedure for SMDJ26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ26A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
