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STMicroelectronics SMBJ22CA-TR
- Part No.:
- SMBJ22CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22CA-TR.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:9,585
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Product details
Overview
SMBJ22CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed to protect sensitive signal lines and power rails against IEC 61000-4-2 ESD (±30 kV air/contact), IEC 61000-4-4 EFT (4 kV), and inductive switching surges. It features a 22 V standoff voltage (VRM), 35.5 V clamping voltage at 17.7 A (10/1000 µs), and 600 W peak pulse power rating.
For engineers reviewing the SMBJ22CA-TR datasheet, SMBJ22CA-TR pinout, SMBJ22CA-TR application, or SMBJ22CA-TR equivalent, key selection criteria include bidirectional clamping symmetry, low leakage (<0.2 µA @ 25 °C), high junction temperature capability (150 °C), and UL497B recognition for isolated loop protection.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds the reverse standoff voltage (VRM = 22 V), it avalanches into low-impedance conduction, diverting surge current away from downstream ICs or MOSFETs. Its planar junction structure ensures stable breakdown characteristics and low capacitance (≈180 pF @ 1 V, bidirectional).
Clamping performance is defined by dynamic resistance (RD = 0.481 Ω), enabling tight voltage control under 10/1000 µs surges up to 17.7 A. Thermal design is supported by a maximum junction temperature of 150 °C and validated reflow profile per J-STD-020 MSL level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 22 V - Maximum continuous reverse operating voltage before clamping begins. |
| Breakdown Voltage (VBR) | 24.4–25.7 V @ 1 mA - Confirmed avalanche onset range ensuring reliable triggering margin. |
| Clamping Voltage (VCL) | 35.5 V @ 17.7 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained surge energy handling at 25 °C ambient. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimal DC loading on high-impedance signal paths. |
| Junction Temperature (Tj) | -55 to +150 °C - Enables operation in industrial and automotive under-hood environments. |
| ESD Rating | ±30 kV (IEC 61000-4-2, air & contact discharge) - Full Level 4 compliance without external filtering. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, JEDEC-registered outline with matte tin-plated leads (J-STD-002 E3 compliant). Dimensions: 3.30–3.95 mm length × 5.10–5.60 mm width × 2.45 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient return path (bidirectional) | Shared terminal for symmetrical clamping; connects to ground or common reference plane. |
| Cathode (Marked End) | Transient return path (bidirectional) | Identical function to anode; device has no polarity-both terminals behave identically under reverse/forward transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL in both directions enables single-device protection of AC-coupled or floating signal lines. |
| UL497B recognition | Agency file E136224 certifies use as isolated loop circuit protector in telecom and industrial interfaces. |
| Low dynamic resistance | RD = 0.481 Ω minimizes clamping voltage rise under high di/dt surges, improving protection margin. |
| High-temperature reliability | Rated for 150 °C Tj with <0.2 µA leakage at 25 °C supports long-term stability in SMPS and motor drive PCBs. |
| Robust solderability | MSL level 1, J-STD-020-compliant reflow profile, and whisker-tested matte tin plating ensure assembly yield. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 24 V CAN FD and LIN bus transceivers from load dump and ESD events in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point to limit transient voltage before reaching PHY IC. Use Value: Clamps 4 kV EFT pulses to ≤35.5 V, preventing latch-up or gate oxide damage in TI TCAN1042 or NXP TJA1044 transceivers. |
Use Scenario: Safeguarding microcontroller GPIOs and sensor inputs (e.g., door lock actuators, window lift switches) against battery line transients. IC Role / Device Role / Timing Role: Low-leakage TVS on 5 V or 12 V supply rails feeding Infineon AURIX™ or Renesas RH850 peripherals. Use Value: Maintains <0.2 µA leakage at 25 °C to avoid false wake-up in sleep mode while surviving 150 °C under-hood thermal cycling. |
| Telecom DSL Line Interface | Medical Patient Monitoring ECG Input |
|
Use Scenario: Shielding ADSL/VDSL line drivers and hybrid couplers from lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Primary-level TVS mounted at RJ-11 jack, coordinated with secondary GDT or MOV for staged protection. Use Value: 600 W (10/1000 µs) rating handles multi-kA induced surges; UL497B listing validates isolation barrier integrity. |
Use Scenario: Protecting high-impedance, low-noise instrumentation amplifiers (e.g., AD8237) in ECG front-end analog signal chains. IC Role / Device Role / Timing Role: Signal-line TVS placed after RC filter but before amplifier input to suppress ESD without degrading bandwidth. Use Value: 180 pF junction capacitance at 1 V ensures <1% gain error at 1 kHz; ±30 kV ESD immunity meets IEC 60601-1-2 clinical requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA from Vishay (SMBJ22CA-E3/5BT) | Same VRM (22 V), slightly higher VCL (36.0 V @ 17.5 A), RD = 0.49 Ω | Identical SMB footprint and UL497B recognition; minor clamping variance within system margin. | Valid drop-in replacement where Vishay sourcing is preferred; verify layout clearance for marking orientation. |
| P6SMB22CA from ON Semiconductor | Same VRM (22 V), identical VCL (35.5 V @ 17.7 A), RD = 0.48 Ω, same SMB package | Matches ST's electrical specs and thermal rating; certified to IEC 61000-4-2/4-4 at same levels. | Direct functional and mechanical substitute; suitable for dual-sourcing strategies in medical or industrial BOMs. |
Compared with SMBJ22CA-TR, Vishay's SMBJ22CA offers near-identical clamping but requires validation of marking alignment in automated optical inspection, while ON Semiconductor's P6SMB22CA delivers identical electrical behavior and simplifies second-source qualification with no derating needed.
Availability
SMBJ22CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive BCM subsystems, telecom DSL line interfaces, and medical ECG front-end designs requiring stable component supply across extended product lifecycles.
Supply support for SMBJ22CA-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.
The SMBJ series belongs to ST's Transient Voltage Suppressor portfolio, engineered specifically for robust, standards-compliant overvoltage protection in harsh electromagnetic environments-prioritizing low leakage, high-temperature stability, and UL-certified isolation integrity.
FAQ
What is the difference between SMBJ22A and SMBJ22CA?
SMBJ22A is unidirectional (anode-cathode polarized), clamping only in reverse bias, while SMBJ22CA is bidirectional-functionally symmetric with identical clamping in both directions. The "CA" suffix denotes bidirectional construction, essential for AC-coupled or floating signal lines like RS-485 or Ethernet PHYs.
Does SMBJ22CA-TR meet automotive AEC-Q200 requirements?
No-SMBJ22CA-TR is not AEC-Q200 qualified. It is rated for industrial and commercial temperature ranges (–55 °C to +150 °C) and carries UL497B, IEC 61000-4-2/4-4, and J-STD-020 certifications. For automotive-grade TVS, ST offers the SMAJ22CA-Q or Automotive SMBJ variants with full AEC-Q200 stress testing.
Can SMBJ22CA-TR be used in parallel for higher surge current handling?
Not recommended without derating and matching. Parallel connection introduces imbalance due to VBR tolerance (±5%), causing one device to conduct first and potentially fail. For >17.7 A surge capability, select a higher-power TVS (e.g., 1.5SMC22CA) or implement staged protection with upstream GDTs.
What is the thermal resistance (Rth j-a) of SMBJ22CA-TR on standard FR4 PCB?
On a standard FR4 board with 70 µm copper thickness and the recommended IPC7531 footprint (5.84 mm × 2.07 mm pad area per lead), Rth j-a is approximately 120 °C/W for single-pulse conditions. This value drops significantly with added copper pour or thermal vias-designers should consult Figure 12 in DS1283 Rev 14 for exact copper-area dependency.
SMBJ22CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 17.7A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SMBJ22CA-TR FAQ
1.How can I place an order for SMBJ22CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22CA-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 SMBJ22CA-TR reliable?
The price and inventory of SMBJ22CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ22CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22CA-TR?
SMBJ22CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22CA-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 SMBJ22CA-TR?
For technical support, including SMBJ22CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22CA-TR requirements.
6.How does Aetrix verify that SMBJ22CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ22CA-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 SMBJ22CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ22CA-TR?
All SMBJ22CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22CA-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 SMBJ22CA-TR part is unused and in its original packaging.
Return procedure for SMBJ22CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ22CA-TR Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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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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Diodes Incorporated
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