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Taiwan Semiconductor Corporation SMDJ22A
- Part No.:
- SMDJ22A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ22A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
SMDJ22A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 22V working stand-off voltage, 24.4–26.9V breakdown voltage at 1mA, and 35.5V clamping voltage at 84.5A peak pulse current. It is designed for robust ESD and surge protection in DC power rails and signal lines of industrial control systems, automotive electronics, and telecom infrastructure.
For engineers reviewing the SMDJ22A datasheet, SMDJ22A pinout, SMDJ22A application, or SMDJ22A equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, 175°C maximum junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and verified clamping performance under 10/1000μs transients.
Technical Context
The SMDJ22A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with low leakage (<1µA at 22V) and stable breakdown characteristics. Its thermal design supports 75°C/W junction-to-ambient resistance and 15°C/W junction-to-lead resistance, enabling reliable operation up to 175°C junction temperature.
It delivers 3000W peak pulse power (1ms, 10/1000μs waveform), clamps at ≤35.5V under 84.5A peak impulse current, and maintains steady-state power dissipation of 6.5W at 25°C ambient - making it suitable for high-energy surge events in automotive load-dump and industrial switching-inductive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 24.4–26.9 V - Verified avalanche breakdown range ensuring predictable turn-on threshold |
| VC @ IPPM=84.5A | 35.5 V - Clamped voltage during 3000W transient, limiting downstream device stress |
| PPK | 3000 W - Peak pulse power handling per 1ms 10/1000μs waveform per IEC 61000-4-5 |
| TJ max | +175 °C - Enables use in under-hood automotive and high-temperature industrial enclosures |
| RθJA | 75 °C/W - Thermal resistance defining derating curve above 25°C ambient |
| IR @ VWM | <1 µA - Low leakage preserves system efficiency in always-on power monitoring circuits |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads, JEDEC-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / Surge return path | Connected to protected line's low-side or ground reference; conducts during reverse-biased transient |
| Cathode | Protected circuit node / High-side connection | Connected to the line being protected (e.g., 24V rail); blocks normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable breakdown voltage and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive electronic modules requiring immunity to battery-line transients |
| Response time <1 ps | Protects sensitive ICs before transient energy couples into signal paths |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance for industrial and consumer end-equipment |
| DO-214AB mechanical robustness | UL 94V-0 molding compound and JESD201 Class 2 whisker resistance support automated reflow assembly |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback from 24V solenoid/relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or signal inputs to clamp voltage spikes to ≤35.5V. Use Value: Prevents latch-up or permanent damage to microcontrollers and isolated amplifiers exposed to >100V transients. | Use Scenario: Input protection on LIN/CAN power supply pins subjected to load-dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary surge limiter on 12V/24V battery-fed subsystems, coordinated with upstream fuses. Use Value: Maintains functional safety by limiting clamped voltage below 40V, preserving MCU reset thresholds and regulator input ratings. |
| Telecom Power Supplies | Renewable Energy Inverters |
Use Scenario: Secondary-side DC output protection in AC/DC adapters powering base station radios and remote PHY units. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing lightning-induced surges on 24V/48V distribution rails. Use Value: Achieves <1ps reaction to meet ITU-T K.20/K.44 immunity requirements without adding series impedance. | Use Scenario: DC-link overvoltage suppression in solar string combiners exposed to grid-switching transients. IC Role / Device Role / Timing Role: Standoff-rated TVS parallel to bulk capacitors to prevent capacitor overvoltage failure during rapid PV array disconnection. Use Value: Withstands 3000W pulses while maintaining VWM = 22V margin above nominal 20V DC-link voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC22 | Lower PPK = 1500W; VC = 37.5V @ 40A; same DO-214AB package | Not rated for ISO 7637-2 Pulse 5a (load dump); suited for lower-energy ESD-only scenarios | Select when cost sensitivity outweighs automotive-grade surge margin and 3000W capability is unnecessary |
| 1.5KE22A | Through-hole TO-218 package; identical VWM/VBR/VC specs but higher RθJA (60°C/W) | Requires PCB through-hole real estate and wave soldering; unsuitable for fully SMT designs | Choose only if legacy board redesign is impractical and thermal budget allows higher junction rise |
Compared with SAC22 and 1.5KE22A, the SMDJ22A provides superior surge robustness (3000W vs. 1500W/1500W), automotive qualification, and SMT manufacturability - making it the preferred choice for new industrial and automotive designs requiring high-reliability surface-mount TVS protection.
Availability
SMDJ22A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, full traceability, and lifecycle continuity.
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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, automotive, and consumer markets since 1979.
The SMDJ series was developed specifically for high-power, surface-mount transient suppression in harsh electromagnetic environments - emphasizing ISO 7637-2 compliance, thermal resilience, and automated assembly readiness.
FAQ
What is the maximum clamping voltage of the SMDJ22A under peak pulse conditions?
The SMDJ22A has a maximum clamping voltage (VC) of 35.5 V when subjected to an 84.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on protected circuitry during a 3000W transient event. The SMDJ22A maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMDJ22A suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMDJ22A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b - covering common conducted transient threats in automotive 12V and 24V systems, including supply line interruptions, inductive switching, and capacitive coupling. It is not rated for Pulse 5a (load dump), so additional protection may be needed in battery-line applications. The SMDJ22A's DO-214AB package and 175°C TJ rating further support under-hood deployment.
What is the polarity configuration of the SMDJ22A, and how is it marked on the device?
The SMDJ22A is a unidirectional TVS diode, with the cathode identified by a distinct band on the DO-214AB (SMC) package body. The marking code "PEX" appears adjacent to the cathode band. This polarity must be observed during PCB layout: cathode connects to the protected line (e.g., 24V rail), anode to ground or low-side reference. Reverse orientation will prevent proper clamping during overvoltage events.
How does the SMDJ22A compare to the SMDJ22CA variant?
The SMDJ22CA is the bidirectional version of the same platform, offering symmetrical clamping in both polarities with identical VWM (22V), VBR (24.4–26.9V), and VC (35.5V) ratings. The SMDJ22A is unidirectional and intended for DC rail protection where polarity is fixed; the SMDJ22CA suits AC-coupled or floating signal lines subject to bipolar transients. Both share the same DO-214AB package, thermal specs, and surge ratings.
What is the steady-state power dissipation rating for the SMDJ22A at 25°C ambient?
The SMDJ22A has a steady-state power dissipation (PD) rating of 6.5 W at TA = 25°C. This value reflects continuous DC power handling capability under ideal heatsinking conditions and is significantly lower than its 3000W peak pulse rating. In practice, the SMDJ22A operates near zero power during normal conditions due to sub-1µA leakage, and only dissipates energy during transient events - making it highly efficient for intermittent surge protection.
SMDJ22A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 84.5A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
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
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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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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