My Inquiry
My Account
Alpha & Omega Semiconductor Inc. SMDJ22A
- Part No.:
- SMDJ22A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ22A.pdf
- Description:
- 1CH 22V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:4,183
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ22A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for high-energy surge protection in DC power lines and signal interfaces. It features a 22.0 V reverse stand-off voltage (VRWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage at 84.6 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 SMDJ22A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (RθJL = 15 °C/W), unidirectional polarity confirmation via cathode band marking, and DO-214AB package compatibility with 8.0 mm × 8.0 mm copper pad layouts.
Technical Context
The SMDJ22A operates as a silicon avalanche diode that enters controlled breakdown when transient voltage exceeds its VBR threshold, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<2.0 µA @ VRWM) and low temperature coefficient (ΔVBR = 0.1% × VBR × ΔT).
It is rated for non-repetitive 10/1000 µs surges up to 3000 W with 0.01% duty cycle, requires no external bias, and achieves sub-1 ps response time from 0 V to VBR. Thermal performance is specified with 15 °C/W junction-to-lead resistance under JEDEC DO-214AB mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 24.4–26.9 V - Confirmed avalanche onset range; defines minimum overvoltage threshold |
| Vc @ IPPM | 35.5 V - Clamped voltage at 84.6 A peak pulse; determines protected IC's voltage stress limit |
| PPPM (10/1000 µs) | 3000 W - Surge energy handling capacity; sets minimum surge immunity level per IEC 61000-4-5 |
| TJ max | +150 °C - Maximum junction temperature; constrains PCB copper area and ambient derating |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables accurate thermal design with soldered leads |
| IR @ VRWM | ≤2.0 µA - Reverse leakage at rated stand-off; ensures minimal standby power loss |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case, matte tin lead-free plating, and cathode band marking on the anode end for unidirectional polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts during reverse overvoltage events |
| Anode (non-banded end) | Reference / ground return | Typically tied to system ground or low-impedance return path for clamping path closure |
Key Features
| Feature | Design Value |
|---|---|
| 3000 W peak pulse power | Enables single-device protection against Level 4 IEC 61000-4-5 (4 kV/2 Ω) surges on 24 V DC rails |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage across temperature and humidity stress |
| Sub-1 ps response time | Clamps transients faster than typical MOSFET/gate driver propagation delays, preventing latch-up |
| MSL1 moisture sensitivity | Allows standard reflow without baking; compatible with automated SMT assembly at 260 °C peak |
| UL 94V-0 flammability rating | Meets safety requirements for enclosed industrial enclosures and power supply housings |
Applications
| Industrial Motor Drives | Programmable Logic Controllers (PLCs) |
|---|---|
Use Scenario: Protection of 24 V DC input terminals against load dump and inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Unidirectional TVS placed between terminal and ground to clamp transients before they reach upstream DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 35.5 V, staying safely below 40 V absolute maximum ratings of common industrial PMICs and interface ICs. | Use Scenario: Input/output module surge suppression for analog current loop (4–20 mA) and digital discrete I/O channels exposed to field wiring. IC Role / Device Role / Timing Role: Standoff-rated TVS on each channel to absorb fast EFT bursts (IEC 61000-4-4) and lightning-induced surges coupled into long cable runs. Use Value: 84.6 A peak pulse current capability handles >2 kV/500 Ω surge generator outputs without degradation after repeated strikes. |
| Uninterruptible Power Supplies (UPS) | Telecom Power Distribution Units |
Use Scenario: DC bus protection in battery backup circuits where relay switching and rectifier recovery generate high dv/dt transients. IC Role / Device Role / Timing Role: Primary clamping device across +24 V or +48 V DC bus rails to prevent overvoltage damage to MOSFET switches and sensing amplifiers. Use Value: 15 °C/W RθJL allows direct thermal coupling to copper pour, sustaining repeated surges without thermal runaway. | Use Scenario: Protection of -48 V telecom distribution boards against accidental hot-swap transients and grounding faults. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at board edge connectors to shunt surge energy before entering regulation and monitoring circuitry. Use Value: 2.0 µA IR at 22 V ensures negligible impact on precision -48 V reference and sense resistor networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC22A (Littelfuse) | Same DO-214AB package; VBR = 24.4–27.0 V; Vc = 35.5 V @ 84.6 A; 3000 W rating | Identical clamping performance but higher IR (5 µA) and no MSL1 rating | Select when UL 94V-0 is not required and higher leakage is acceptable |
| 1.5KE22A (ON Semiconductor) | Through-hole DO-15 package; same electrical specs but RθJA = 100 °C/W vs. 75 °C/W for SMDJ22A | Not suitable for high-density SMT layouts; requires PCB real estate and wave solder process | Select only for legacy through-hole designs or prototyping with breadboard adapters |
Compared with SAC22A, the SMDJ22A offers lower leakage and MSL1 compliance for automated assembly; compared with 1.5KE22A, it delivers superior thermal performance and space savings in modern SMT power systems.
Availability
SMDJ22A is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers (PLCs), and uninterruptible power supplies (UPS) requiring stable component supply, RoHS-compliant packaging, and traceable sourcing for long-lifecycle production.
Supply support for SMDJ22A 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, IGBTs, and protection devices for power conversion and management.
The SMDJ series is part of AOS' transient voltage suppressor portfolio, engineered specifically for robust, high-power surge immunity in industrial automation, telecom infrastructure, and renewable energy systems.
FAQ
What is the maximum clamping voltage of the SMDJ22A under a 10/1000 µs surge?
The SMDJ22A has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 84.6 A on a 10/1000 µs waveform. This value is measured per JEDEC test standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 36 V-rated downstream components. The SMDJ22A maintains this clamping performance across its full operating temperature range.
Is the SMDJ22A suitable for bidirectional surge protection?
No, the SMDJ22A is a unidirectional TVS diode, indicated by the "A" suffix and marked with a cathode band. For bidirectional protection, the SMDJ22CA variant must be used - it provides symmetrical clamping in both polarities. Using the SMDJ22A in reverse-biased configurations risks permanent breakdown, as its anode is not rated for sustained reverse conduction. Always verify polarity alignment during PCB layout for the SMDJ22A.
What is the thermal resistance from junction to lead (RθJL) for the SMDJ22A?
The SMDJ22A has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, as defined in the AOS datasheet Rev. 1.2. This parameter enables precise thermal modeling of power dissipation during repetitive surge events. The SMDJ22A's low RθJL supports reliable operation in high-ambient environments up to +105 °C when properly heatsinked via PCB copper.
Does the SMDJ22A meet RoHS and halogen-free requirements?
Yes, the SMDJ22A is an AOS Green Product: it is fully RoHS compliant, lead-free, and halogen-free per AOS' Green Policy (document ID AOSGreenPolicy.pdf). Its matte tin lead finish and UL 94V-0 rated molding compound satisfy environmental and safety requirements for industrial and telecom equipment sold globally. The SMDJ22A carries no exemptions and is suitable for use in EU WEEE and REACH-regulated applications.
What is the reverse leakage current specification for the SMDJ22A at its VRWM?
The SMDJ22A exhibits a maximum reverse leakage current (IR) of 2.0 µA when biased at its rated reverse stand-off voltage (VRWM) of 22.0 V and tested at 25 °C. This ultra-low leakage ensures minimal power loss in always-on protection circuits and avoids loading sensitive analog references or current-sense nodes. The SMDJ22A maintains this specification across its full operating temperature range of –55 °C to +150 °C.
SMDJ22A 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 84.6A
- 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
SMDJ22A FAQ
1.How can I place an order for SMDJ22A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ22A 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 SMDJ22A reliable?
The price and inventory of SMDJ22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ22A is usually 5 days.
3.What payment methods are accepted for SMDJ22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ22A?
SMDJ22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ22A 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 SMDJ22A?
For technical support, including SMDJ22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ22A requirements.
6.How does Aetrix verify that SMDJ22A is sourced from the original manufacturer or authorized distributors?
All SMDJ22A 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 SMDJ22A meets industry standards.
7.What is the process for return or replacement of SMDJ22A?
All SMDJ22A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ22A, 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 SMDJ22A part is unused and in its original packaging.
Return procedure for SMDJ22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ22A 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…
