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STMicroelectronics SMCJ22A-TR
- Part No.:
- SMCJ22A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22A-TR.pdf
- Description:
- TVS DIODE 22VWM 48.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,508
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Product details
Overview
SMCJ22A-TR from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, designed for primary-level surge protection of DC power rails and signal lines. It features a 22 V standoff voltage (VRM), 24.4–25.7 V breakdown voltage at 1 mA, and clamps transients to ≤35.5 V at 44 A (10/1000 µs), enabling robust ESD and lightning surge immunity in industrial power supplies and automotive ECUs.
For engineers reviewing the SMCJ22A-TR datasheet, SMCJ22A-TR pinout, SMCJ22A-TR application, or SMCJ22A-TR equivalent, key selection criteria include clamping voltage at rated surge current, junction temperature derating above 25 °C, unidirectional polarity requirement, and compatibility with IPC7531-compliant SMC footprints on FR4 PCBs.
Technical Context
This TVS diode uses planar silicon junction technology optimized for low leakage (≤0.2 µA at 25 °C) and high thermal stability up to 150 °C junction temperature. Its dynamic resistance of 0.194 Ω enables tight clamping under fast-rising 8/20 µs surges up to 48.3 A while maintaining VCL ≤48.3 V.
The device complies with IEC 61000-4-2 (±30 kV contact/air discharge) and IEC 61000-4-4 Level 4 (4 kV), and its SMC package meets UL94 V0 flammability and J-STD-020 MSL Level 1 standards - eliminating need for pre-baking before reflow soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 22 V - Maximum continuous DC operating voltage before conduction begins. |
| Breakdown Voltage (VBR) | 24.4–25.7 V at 1 mA - Ensures reliable triggering during overvoltage events without false trips. |
| Clamping Voltage (VCL) | ≤35.5 V at 44 A (10/1000 µs) - Limits downstream component stress to safe levels during surge. |
| Peak Pulse Power | 1500 W (10/1000 µs), up to 1250 W at Tj = 150 °C - Supports sustained surge handling in thermally constrained layouts. |
| Leakage Current (IRM) | ≤0.2 µA at VRM and 25 °C - Minimizes standby power loss in battery-backed or low-power systems. |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in under-hood automotive or industrial environments without derating. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline per JEDEC MO-136, compatible with automated assembly. |
Pinout & Package
SMCJ22A-TR is a two-terminal unidirectional TVS diode in SMC (DO-214AB) package. Cathode is marked by a band on the body; anode is unmarked. The SMC package has coplanar gull-wing leads optimized for thermal dissipation and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction path during reverse-biased surge events. |
| Cathode | High-side connection point | Marked terminal connected to protected line; blocks normal operation but conducts when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV contact and air discharge - Eliminates need for external ESD protection in USB, CAN, or sensor interfaces. |
| Low dynamic resistance | 0.194 Ω - Reduces clamping voltage rise under high-current surges, improving protection margin. |
| High-temperature operation | Rated to 150 °C junction - Maintains full 1500 W surge capability in hot ambient environments without derating. |
| UL94 V0 epoxy housing | Flame-retardant encapsulation - Meets safety requirements for industrial and transportation equipment certifications. |
| MSL Level 1 rating | No moisture sensitivity - Can be stored and assembled without dry-pack or baking, reducing manufacturing overhead. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input rail exposed to load dump and ISO 7637-2 pulses in factory automation controllers. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and LDOs to absorb energy from 10/1000 µs transients. Use Value: Clamps 44 A surge to ≤35.5 V, preventing damage to 36 V-rated input stages and ensuring system uptime during brownouts. |
Use Scenario: LIN bus and sensor supply lines in BCM modules subjected to ESD and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V sensor rails to suppress coupling from nearby solenoid switching. Use Value: 0.2 µA leakage preserves battery life over 10-year vehicle service life; 150 °C rating supports under-dash mounting. |
| Telecom PoE Injector Port | Renewable Energy Charge Controller |
|
Use Scenario: 48 V DC output port of IEEE 802.3af/at PoE injectors exposed to induced surges from Ethernet cabling. IC Role / Device Role / Timing Role: Secondary surge clamp after primary gas discharge tube, limiting let-through voltage to PHY ICs. Use Value: 35.5 V clamping ensures safe operation of 50 V-rated Ethernet magnetics and PHY transceivers during 4 kV IEC 61000-4-4 events. |
Use Scenario: PV array input stage of solar charge controllers facing lightning-induced surges in rural installations. IC Role / Device Role / Timing Role: First-line protection on MPPT input before MOSFET switches and current-sense amplifiers. Use Value: 1500 W peak power rating handles multi-kA induced surges; SMC package allows direct heatsinking to chassis ground plane. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A-TR | Lower peak power: 600 W (10/1000 µs); same VRM/VBR/VCL specs; SMB package (smaller footprint, lower thermal mass). | Not suitable for 1500 W surge environments; limited to low-energy ESD-only zones like front-panel buttons. | Select only if space-constrained and surge energy is confirmed ≤600 W. |
| 1.5KE22A | Through-hole DO-201 package; identical electrical specs but higher thermal resistance and no MSL Level 1 rating. | Requires wave soldering; incompatible with fully SMT production; unsuitable for high-reliability automotive reflow lines. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ22A-TR and 1.5KE22A, SMCJ22A-TR uniquely delivers 1500 W surge capability in a reflow-ready, MSL Level 1 SMC package - making it the only option for high-energy, high-volume SMT applications requiring both industrial-grade reliability and automated manufacturability.
Availability
SMCJ22A-TR is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control modules, telecom PoE injector ports, and renewable energy charge controllers requiring stable component supply across extended product lifecycles.
Supply support for SMCJ22A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
SMCJ series TVS diodes are part of ST's protection portfolio, engineered specifically for high-energy transient suppression in harsh environments - emphasizing low leakage, high-temperature stability, and compliance with IEC/ISO automotive and industrial immunity standards.
FAQ
What is the maximum clamping voltage of SMCJ22A-TR at 44 A?
The maximum clamping voltage (VCL) is 35.5 V under 10/1000 µs waveform at 44 A, measured at 25 °C ambient. At elevated junction temperatures, VCL increases linearly with αT = 9.6 × 10⁻⁴/°C - e.g., at 125 °C, VCL ≈ 38.2 V. This value defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMCJ22A-TR be used in bidirectional configurations?
No - SMCJ22A-TR is unidirectional only, with cathode-marked polarity. For bidirectional protection, ST offers the SMCJ22CA variant, which provides symmetrical clamping for AC-coupled or floating signal lines. Using SMCJ22A-TR in reverse-biased AC applications risks permanent breakdown due to forward conduction during negative half-cycles.
Does SMCJ22A-TR require pre-baking before reflow soldering?
No - it carries J-STD-020 MSL Level 1 rating, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without dry-packing or baking. The recommended ST ECOPACK reflow profile peaks at 240–245 °C for 2–3 seconds, compatible with standard lead-free processes.
How does leakage current change with temperature?
Leakage current (IRM) rises exponentially with junction temperature: at 25 °C it is ≤0.2 µA, but reaches ~100 nA at 85 °C and ~10 µA at 125 °C (per Figure 9). This behavior is inherent to silicon PN junctions and must be accounted for in ultra-low-power or high-temperature sensor circuits where sub-µA bias currents are critical.
SMCJ22A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- 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:
- 48.3V
- Current - Peak Pulse (10/1000µs):
- 207A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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:
- SMC
SMCJ22A-TR FAQ
1.How can I place an order for SMCJ22A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22A-TR 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 SMCJ22A-TR reliable?
The price and inventory of SMCJ22A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ22A-TR is usually 5 days.
3.What payment methods are accepted for SMCJ22A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22A-TR?
SMCJ22A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22A-TR 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 SMCJ22A-TR?
For technical support, including SMCJ22A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22A-TR requirements.
6.How does Aetrix verify that SMCJ22A-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ22A-TR 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 SMCJ22A-TR meets industry standards.
7.What is the process for return or replacement of SMCJ22A-TR?
All SMCJ22A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22A-TR, 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 SMCJ22A-TR part is unused and in its original packaging.
Return procedure for SMCJ22A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22A-TR Tags
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