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STMicroelectronics SMBJ40CA-TR
- Part No.:
- SMBJ40CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA-TR.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,985
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Product details
Overview
SMBJ40CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection on signal/power lines in industrial, telecom, and automotive electronics. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 64.5 V at 9.7 A, operates up to 150 °C junction temperature, and features low leakage (≤0.2 µA at 25 °C), housed in an SMB package.
For engineers reviewing the SMBJ40CA-TR datasheet, SMBJ40CA-TR pinout, SMBJ40CA-TR application, or SMBJ40CA-TR equivalent, key selection criteria include bidirectional clamping voltage (64.5 V), IEC 61000-4-2 ±30 kV air/contact discharge compliance, UL497B recognition (E136224), low dynamic resistance (0.728 Ω), and SMB footprint compatibility with IPC7531.
Technical Context
This TVS diode uses planar silicon technology to achieve stable clamping performance across temperature (−55 °C to +150 °C) and high reliability under repeated surge stress. Its bidirectional architecture enables symmetric protection of AC-coupled or differential signal paths without polarity constraints.
It meets IEC 61000-4-4 Level 4 (4 kV) and exceeds IEC 61000-4-2 Level 4 (±30 kV), with verified failure mode as short-circuit under over-specified voltage/current-enabling predictable system-level fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 600 W - sustains industrial-grade lightning-induced surges per IEC 61000-4-5 |
| Clamping Voltage (VCL) | 64.5 V at 9.7 A - limits downstream IC voltage stress during 10/1000 µs transients |
| Standoff Voltage (VRWM) | 40 V - blocks normal operating voltage while remaining transparent to signals |
| Leakage Current (IR) | ≤0.2 µA at 25 °C - avoids signal integrity degradation in high-impedance sensor interfaces |
| Operating Junction Temp | −55 °C to +150 °C - supports under-hood automotive and industrial SMPS applications |
| Dynamic Resistance (RD) | 0.728 Ω - ensures rapid voltage stabilization during fast-rising ESD events |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact/air - exceeds Level 4 for front-panel and connector protection |
Pinout & Package
The SMBJ40CA-TR is housed in an SMB (DO-214AA) surface-mount package measuring 3.3–3.95 mm × 5.1–5.6 mm × 1.9–2.45 mm (L×W×H), with matte tin-plated leads compliant with J-STD-020 MSL Level 1 and JEDEC registered outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Anode-side terminal (bidirectional) | Shared terminal for both polarities; connects to protected line (e.g., RS-485 A/B) |
| Anode (A) | Cathode-side terminal (bidirectional) | Shared terminal opposite K; forms symmetrical clamping path with K |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC or differential lines (e.g., CAN, RS-485) without polarity concerns |
| UL497B recognition | Validated as isolated loop circuit protector (File E136224) for telecom and industrial safety compliance |
| Low Tj-dependent leakage | Stays ≤1 µA up to 85 °C - preserves accuracy in precision analog sensor front-ends |
| Planar silicon construction | Delivers consistent VBR and RD across temperature and lifetime vs. older junction-barrier designs |
| High surge capability at Tj = 150 °C | Maintains 350 W (10/1000 µs) clamping margin in thermally stressed environments like motor drives |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24 V DC digital input channels against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed between field wiring and optocoupler input, clamping transients before isolation barrier. Use Value: Prevents false triggering and optocoupler damage by limiting voltage to ≤64.5 V during 10/1000 µs surges up to 600 W. | Use Scenario: Safeguarding LIN bus transceivers from battery transients and ESD during vehicle assembly and service. IC Role / Device Role / Timing Role: TVS mounted directly at connector pins, shunting ESD energy before reaching LIN PHY. Use Value: Achieves ±30 kV IEC 61000-4-2 immunity while maintaining <0.2 µA leakage to avoid bus bias shift. |
| Telecom DSL Line Interface | Medical Patient Monitoring Port |
Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (tip/ring), referenced to chassis ground via low-inductance path. Use Value: Clamps common-mode surges to 64.5 V with 0.728 Ω dynamic resistance, preserving signal integrity up to 30 MHz. | Use Scenario: Shielding ECG/SpO₂ analog front-end inputs from ESD during clinical handling and cable coupling. IC Role / Device Role / Timing Role: Low-leakage TVS installed at connector entry point, guarding high-impedance amplifier inputs. Use Value: Ensures <0.2 µA leakage at 25 °C prevents DC offset errors in microvolt-level biopotential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA from Vishay (SMBJ40CA-E3/5AT) | Identical standoff (40 V), clamping (64.5 V), and SMB package; slightly higher leakage (0.5 µA max at 25 °C) | Same PCB footprint and surge rating; lower ESD margin (±25 kV) vs. ST's ±30 kV | Preferred where cost sensitivity outweighs need for highest ESD immunity |
| P6SMB40CA from ON Semiconductor | Same electrical specs but rated for 600 W only at Tj = 25 °C; derates to 280 W at 125 °C (vs. ST's 350 W at 150 °C) | Limited thermal headroom in high-ambient environments like engine compartments | Acceptable for ambient-temp-limited consumer gear; avoid in automotive under-hood use |
Compared with Vishay SMBJ40CA-E3/5AT and ON Semi P6SMB40CA, the ST SMBJ40CA-TR offers superior high-temperature surge retention (350 W @ 150 °C) and best-in-class ±30 kV ESD immunity-critical for automotive and industrial deployments where thermal and ESD margins are non-negotiable.
Availability
SMBJ40CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom DSL line cards, and medical patient monitoring ports requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ40CA-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, delivering innovative silicon solutions for automotive, industrial, and power management markets.
The SMBJ series belongs to ST's Transient Voltage Suppressor portfolio, engineered specifically for high-reliability, high-temperature ESD/surge protection in harsh environments-emphasizing low leakage, UL497B compliance, and planar process consistency.
FAQ
What is the maximum clamping voltage of SMBJ40CA-TR at its rated peak pulse current?
The SMBJ40CA-TR clamps to 64.5 V at 9.7 A under a 10/1000 µs waveform, per Table 2 of DS1283 Rev 14. This value is measured at Tamb = 25 °C and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Does SMBJ40CA-TR meet UL497B requirements for isolated loop protection?
Yes-SMBJ40CA-TR is UL497B recognized as an isolated loop circuit protector under Agency File Number E136224, confirmed in Section 1 of DS1283 Rev 14. This certification validates its suitability for telecom and industrial loop-powered systems requiring safety-rated transient suppression.
How does SMBJ40CA-TR perform at elevated junction temperatures?
At Tj = 150 °C, SMBJ40CA-TR maintains 350 W peak pulse power (10/1000 µs), per Figure 3 in DS1283 Rev 14. Its clamping voltage increases predictably with temperature using αT = 10.1 × 10−4/°C, enabling accurate worst-case design margining.
Is SMBJ40CA-TR compatible with lead-free reflow soldering processes?
Yes-SMBJ40CA-TR supports lead-free reflow per ST's recommended profile (Figure 22, DS1283 Rev 14), peaking at 240–245 °C for ≤60 seconds. Its matte tin-plated leads comply with J-STD-002, JESD 22-B102 E3, and MIL-STD-750 Method 2026.
SMBJ40CA-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.7A
- 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
SMBJ40CA-TR FAQ
1.How can I place an order for SMBJ40CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA-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 SMBJ40CA-TR reliable?
The price and inventory of SMBJ40CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ40CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA-TR?
SMBJ40CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA-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 SMBJ40CA-TR?
For technical support, including SMBJ40CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA-TR requirements.
6.How does Aetrix verify that SMBJ40CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA-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 SMBJ40CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ40CA-TR?
All SMBJ40CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA-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 SMBJ40CA-TR part is unused and in its original packaging.
Return procedure for SMBJ40CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CA-TR Tags
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ESD9B5.0ST5G
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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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
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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