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Taiwan Semiconductor Corporation SMDJ22AH
- Part No.:
- SMDJ22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ22AH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,705
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Product details
Overview
SMDJ22AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 22 V, breakdown voltage range of 24.4–26.9 V at 1 mA test current, and clamping voltage of 35.5 V at 84.5 A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial ESD/EMI protection in power supply rails and signal lines.
For engineers reviewing the SMDJ22AH datasheet, SMDJ22AH pinout, SMDJ22AH application, or SMDJ22AH equivalent, key selection criteria include its DO-214AB (SMC) package, 175 °C maximum junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, and unidirectional polarity marking - all critical for robust transient suppression in automotive ECUs and industrial I/O interfaces.
Technical Context
The SMDJ22AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast clamping (<1.0 ps typical response) and stable breakdown characteristics across -55 °C to +175 °C. Its single-die DO-214AB construction supports high surge immunity without derating up to 125 °C ambient.
It meets ISO 7637-2 for automotive transients (Pulse 1, 2a, 2b, 3a, 3b), features 75 °C/W junction-to-ambient thermal resistance, and delivers 3000 W peak pulse power (1 ms, 10/1000 µs waveform) with 35.5 V clamping at 84.5 A - enabling reliable protection of 24 V systems against load dump and inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA; defines safe DC bias margin for 24 V nominal systems. |
| VBR @ IT=1 mA | 24.4–26.9 V - Measured breakdown range ensures consistent avalanche initiation across production lots and temperature. |
| VC @ IPPM | 35.5 V - Clamping voltage at 84.5 A peak pulse current; limits downstream IC stress during ISO 7637-2 Pulse 2b (load dump). |
| PPK | 3000 W - Peak pulse power rating per 1 ms 10/1000 µs waveform; enables single-device protection against high-energy transients. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in under-hood automotive environments and sealed industrial enclosures. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs PCB copper area requirements for sustained power dissipation. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, J-STD-002 solderable, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during forward surge (e.g., reverse battery connection). |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24 V rail); enters breakdown when reverse voltage exceeds VWM, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for ECU, body control, and ADAS modules. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure. |
| ISO 7637-2 compliance | Guarantees survivability against standardized automotive transients (Pulse 1/2a/2b/3a/3b), eliminating need for additional filtering stages. |
| Sub-1 ps response time | Clamps within picoseconds of transient onset - faster than most microcontroller I/O protection circuits and essential for safeguarding high-speed CAN/LIN interfaces. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) against load dump and alternator transients per ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and local regulator input to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits voltage to ≤35.5 V during 84.5 A transients, preventing overvoltage damage to 36 V-rated regulators and ensuring uninterrupted MCU operation. | Use Scenario: Shielding 24 V digital input channels on programmable logic controllers from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Front-end transient suppressor mounted directly at connector entry point, ahead of optocoupler or Schmitt trigger input stage. Use Value: Absorbs >3000 W energy without degradation, maintaining signal integrity and eliminating false triggering caused by 1 kV ESD or inductive kickback. |
| Telecom Power Interface Protection | Motor Drive Control Signal Protection |
Use Scenario: Safeguarding DC power inputs of remote radio units (RRUs) and base station power supplies from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on 24/48 V DC feed lines, coordinated with upstream fuses and downstream LC filters. Use Value: Withstands repeated 10/1000 µs surges up to 3000 W while maintaining <5 µA leakage at 22 V - preserving efficiency in always-on telecom equipment. | Use Scenario: Protecting enable, direction, and PWM signals in BLDC motor drivers from cross-talk and back-EMF coupling during commutation. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at microcontroller GPIO pins driving gate drivers or isolated level shifters. Use Value: Sub-1 ps response prevents latch-up in CMOS inputs; clamping at 35.5 V avoids exceeding absolute maximum ratings of 5 V or 3.3 V logic interfaces. |
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 | Same DO-214AB package, 22 V VWM, but lower PPK = 1500 W and higher VC = 38.9 V at 38.9 A. | Not suitable for ISO 7637-2 Pulse 2b (load dump); limited to lower-energy transients like ESD or data-line surges. | Select SMDJ22AH when 3000 W surge handling and automotive-grade qualification are mandatory. |
| 1.5KE22A | Through-hole DO-201 package, same VWM/VC specs, but slower response (~1 ns) and no AEC-Q101 qualification. | Requires manual assembly; not viable for automated SMT lines or automotive production environments. | Choose SMDJ22AH for surface-mount compatibility, AEC-Q101 compliance, and tighter thermal performance (RθJA = 75 °C/W vs. ~100 °C/W). |
Compared with SAC22 and 1.5KE22A, the SMDJ22AH delivers superior surge capacity (3000 W vs. 1500 W/1500 W), automotive qualification, and optimized thermal design - making it the preferred choice for high-reliability 24 V systems where board space, automated assembly, and transient severity are critical constraints.
Availability
SMDJ22AH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power interface designs requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMDJ22AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 certified production lines.
The SMDJ22AH belongs to TSC's SMDJxH series of high-power surface-mount TVS diodes, engineered specifically for automotive and industrial transient suppression where high peak power, fast response, and rugged packaging are essential.
FAQ
What is the maximum clamping voltage of the SMDJ22AH under peak pulse conditions?
The SMDJ22AH has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 84.5 A (10/1000 µs waveform). This value is measured per JEDEC standards and guarantees that protected circuitry downstream will not experience voltages exceeding 35.5 V during worst-case transients - a critical parameter for ensuring compatibility with 36 V-rated regulators and microcontrollers in 24 V systems. The SMDJ22AH maintains this clamping performance across its full operating temperature range.
Is the SMDJ22AH suitable for bidirectional transient protection?
No, the SMDJ22AH is a unidirectional TVS diode intended only for DC-biased applications such as 24 V power rails. For bidirectional protection (e.g., AC lines or data buses), the SMDJ22CAH variant must be used - it shares the same package and clamping characteristics but provides symmetrical breakdown in both polarities. The SMDJ22AH's cathode band marking and electrical specifications apply exclusively to reverse-biased operation; forward conduction is limited to 3.5 V at 100 A, and it does not suppress positive-going transients on grounded lines.
Does the SMDJ22AH meet automotive qualification standards?
Yes, the SMDJ22AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 for automotive transients, including Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (load dump), and Pulses 3a/3b (switching noise). Its DO-214AB package, glass-passivated junction, and 175 °C maximum junction temperature further support under-hood deployment. Documentation of AEC-Q101 test reports and ISO 7637-2 validation is available upon request for the SMDJ22AH.
What is the thermal resistance and how does it affect PCB layout for the SMDJ22AH?
The SMDJ22AH has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. These values indicate that for every watt of steady-state power dissipated, the junction temperature rises 75 °C above ambient - so at 6.5 W (its rated DC power), ΔT = 488 °C, which exceeds limits. Therefore, the SMDJ22AH is intended for transient-only duty; PCB layout must maximize copper area on both sides connected to its terminals to improve heat spreading and reduce effective RθJA during short pulses. Thermal vias under pads are strongly recommended for the SMDJ22AH.
How does the SMDJ22AH compare to standard 1.5 kW TVS diodes in terms of surge capability?
The SMDJ22AH delivers 3000 W peak pulse power - double the capability of common 1.5 kW TVS diodes like the SMAJ22A or P6SMB22A. This enables it to handle more severe transients such as ISO 7637-2 Pulse 2b (load dump) without derating or parallel staging. Its lower clamping voltage (35.5 V vs. typically 38–42 V for 1.5 kW parts) also reduces stress on downstream components. Unlike many 1.5 kW alternatives, the SMDJ22AH is AEC-Q101 qualified and specified for full automotive temperature range, making it a direct upgrade path where higher surge immunity is required without changing footprint.
SMDJ22AH 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 ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ22AH FAQ
1.How can I place an order for SMDJ22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ22AH 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 SMDJ22AH reliable?
The price and inventory of SMDJ22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ22AH is usually 5 days.
3.What payment methods are accepted for SMDJ22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ22AH?
SMDJ22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ22AH 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 SMDJ22AH?
For technical support, including SMDJ22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ22AH requirements.
6.How does Aetrix verify that SMDJ22AH is sourced from the original manufacturer or authorized distributors?
All SMDJ22AH 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 SMDJ22AH meets industry standards.
7.What is the process for return or replacement of SMDJ22AH?
All SMDJ22AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ22AH, 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 SMDJ22AH part is unused and in its original packaging.
Return procedure for SMDJ22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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