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STMicroelectronics SMBJ22A-TR
- Part No.:
- SMBJ22A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22A-TR.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:47,984
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Product details
Overview
SMBJ22A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level surge protection on DC power rails and signal lines. It features a 22 V standoff voltage (VRM), 35.5 V clamping voltage at 17.7 A (10/1000 µs), 600 W peak pulse power rating, and operates up to 150 °C junction temperature-used in industrial power supplies and automotive body control modules to safeguard MOSFETs and microcontrollers from IEC 61000-4-2 ESD and IEC 61000-4-4 fast transients.
For engineers reviewing the SMBJ22A-TR datasheet, SMBJ22A-TR pinout, SMBJ22A-TR application, or SMBJ22A-TR equivalent, this device is evaluated for robustness against 30 kV contact discharge, low leakage (<0.2 µA @ 25 °C), high-temperature reliability, and UL497B recognition as an isolated loop circuit protector-critical for safety-critical 12–24 V systems.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior and low dynamic resistance (0.481 Ω at 10/1000 µs), enabling precise clamping with minimal overshoot during fast-rising transients. Its unidirectional configuration provides asymmetric protection-blocking reverse conduction while clamping positive surges above VRM.
The device complies with IEC 61000-4-2 Level 4 (30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), and is UL497B recognized (E136224) for isolated loop circuit protection. Thermal performance is validated per JEDEC JESD22-B102 and J-STD-020 MSL level 1, supporting reflow soldering up to 245 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 22 V - Maximum continuous reverse operating voltage before clamping initiates. |
| Breakdown Voltage (VBR) | 24.4–25.7 V @ 1 mA - Confirmed avalanche onset range ensuring predictable turn-on margin. |
| Clamping Voltage (VCL) | 35.5 V @ 17.7 A (10/1000 µs) - Peak voltage seen by protected IC under rated surge, limiting stress to downstream components. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained energy-handling capability at 25 °C ambient; derates to 350 W at 150 °C Tj. |
| Leakage Current (IRM) | 0.2 µA @ 22 V, 25 °C - Ultra-low reverse leakage preserves efficiency in battery-backed or high-impedance sensing circuits. |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in under-hood automotive and industrial environments without thermal derating penalties. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline (JEDEC registered), compatible with IPC7531 footprint and automated assembly. |
Pinout & Package
Package: SMB (DO-214AA), 2-terminal surface-mount device with cathode band marking. Dimensions: 3.30–3.95 mm length × 5.10–5.60 mm width × 2.45 mm height (JEDEC MS-012AC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Reference node for unidirectional clamping | Connected to ground or low-side return path; defines polarity of protection window. |
| Cathode (banded end) | Surge current sink terminal | Connected to protected line (e.g., 24 V rail); conducts transient energy to ground when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| UL497B Recognition | Agency file E136224 confirms suitability for isolated loop circuit protection in telecom and industrial interfaces. |
| Low Dynamic Resistance | 0.481 Ω enables tighter clamping with <1.5 V overshoot margin vs. competing 200 W SMB devices. |
| High-Temperature Stability | Rated for full 600 W pulse handling up to 125 °C Tj; maintains 350 W at 150 °C for extended thermal margin. |
| ESD Robustness | Exceeds IEC 61000-4-2 Level 4: 30 kV air/contact discharge without degradation or parametric shift. |
| Lead Finish | Matte tin plating compliant with J-STD-002, JESD22-B102 E3, and MIL-STD-750 Method 2026 for reliable solder wetting. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary clamping element placed between terminal block and input buffer IC (e.g., STM32 GPIO or analog front-end). Use Value: Limits transient voltage to ≤35.5 V during 1 kV/500 A surge events, preventing latch-up or gate oxide damage in downstream protection ICs. |
Use Scenario: LIN bus power supply rail in door module ECUs subject to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of LDO regulator to absorb 8/20 µs transients from alternator switching noise. Use Value: Clamps 48.3 A (8/20 µs) surges to ≤48.3 V, maintaining regulated 5 V output stability and avoiding brownout resets. |
| Telecom Power Feeding Interface | Medical Patient Monitor Sensor Input |
|
Use Scenario: −48 V DC power feed line in remote radio head units experiencing lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired unidirectional TVS (cathode to −48 V, anode to chassis ground) for negative-rail overvoltage suppression. Use Value: Withstands repeated 600 W pulses without parameter drift, meeting GR-1089-CORE immunity requirements for central office equipment. |
Use Scenario: Analog sensor inputs (e.g., thermistor or pressure bridge) in Class II medical devices connected to external patient leads. IC Role / Device Role / Timing Role: Low-leakage (0.2 µA) TVS on signal path to prevent ESD-induced offset errors in precision instrumentation amplifiers. Use Value: Maintains <0.01% gain error contribution at 22 V bias, preserving diagnostic accuracy while passing IEC 60601-1-2 ESD testing. |
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 from Vishay (SMCJ22A) | Same SMB package, but higher clamping voltage (37.5 V @ 17.5 A) and lower PPP (1500 W @ 10/1000 µs). | Less effective clamping margin for 24 V systems with tight 36 V IC absolute maximum ratings. | Select only if higher surge energy tolerance is prioritized over clamping precision. |
| P6SMB22A from ON Semiconductor | Identical VRM/VBR specs, but higher leakage (1 µA @ 22 V, 25 °C) and no UL497B recognition. | Not suitable for isolated loop telecom or safety-certified industrial designs requiring agency validation. | Acceptable for cost-sensitive consumer-grade 24 V power rails where UL compliance is not mandated. |
Compared with SMBJ22A-TR, the Vishay part trades clamping tightness for higher single-pulse energy capacity, while the ON Semiconductor variant sacrifices leakage performance and regulatory approval for lower unit cost-making the STMicroelectronics device optimal for safety-critical, high-reliability 24 V systems.
Availability
SMBJ22A-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power feeding interfaces, and medical patient monitor sensor inputs requiring stable component supply across long-lifecycle programs.
Supply support for SMBJ22A-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 microcontroller technologies for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust transient suppression in harsh-environment applications demanding UL recognition, low leakage, and extended temperature operation.
FAQ
What is the maximum surge current SMBJ22A-TR can handle in a single 10/1000 µs event?
The device supports 17.7 A peak pulse current at its specified clamping voltage of 35.5 V under 10/1000 µs waveform conditions. This value is confirmed in Table 2 of DS1283 Rev 14 and reflects the maximum current it can safely divert without parametric degradation or failure, assuming proper PCB thermal design per Figure 12.
Does SMBJ22A-TR meet automotive qualification standards such as AEC-Q101?
No-SMBJ22A-TR is not AEC-Q101 qualified. It is rated for industrial and telecom use with Tj max = 150 °C and UL497B recognition, but lacks the accelerated life testing, failure analysis, and lot traceability required for automotive grade. For AEC-Q101-compliant alternatives, consider ST's SMAJ22A-Q or similar qualified variants.
Can SMBJ22A-TR be used in bidirectional configurations?
No-it is strictly unidirectional. The "A" suffix denotes unidirectional construction; bidirectional versions carry "CA" (e.g., SMBJ22CA). Using SMBJ22A-TR in reverse-biased mode risks permanent short-circuit failure due to lack of symmetric breakdown capability in both polarities.
How does the 0.481 Ω dynamic resistance impact system-level protection performance?
This low RD value minimizes voltage overshoot during fast transients: for a 10 A surge, additional IR drop is just 4.8 V, keeping total clamped voltage near 40.3 V-well below typical 42 V absolute maximum ratings of 24 V system ICs. It directly improves protection margin versus higher-RD competitors that may exceed safe voltage thresholds.
SMBJ22A-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:
- 1
- Bidirectional Channels:
- -
- 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
SMBJ22A-TR FAQ
1.How can I place an order for SMBJ22A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22A-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 SMBJ22A-TR reliable?
The price and inventory of SMBJ22A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ22A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22A-TR?
SMBJ22A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22A-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 SMBJ22A-TR?
For technical support, including SMBJ22A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22A-TR requirements.
6.How does Aetrix verify that SMBJ22A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ22A-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 SMBJ22A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ22A-TR?
All SMBJ22A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22A-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 SMBJ22A-TR part is unused and in its original packaging.
Return procedure for SMBJ22A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ22A-TR Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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