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STMicroelectronics SMBJ36CA-TR
- Part No.:
- SMBJ36CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ36CA-TR.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:35,217
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Product details
Overview
SMBJ36CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection on signal/power lines in industrial, automotive, and telecom interfaces. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 58.1 V at 10.3 A, operates up to 150 °C junction temperature, and features low leakage (≤0.2 µA at 25 °C), making it suitable for high-reliability 24–48 V DC power rail and Ethernet PHY line protection.
For engineers reviewing the SMBJ36CA-TR datasheet, SMBJ36CA-TR pinout, SMBJ36CA-TR application, or SMBJ36CA-TR equivalent, this device is selected for IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 level 4 (4 kV) compliance, low dynamic resistance (1.35 Ω), and SMB package compatibility with IPC7531 footprints in space-constrained PCB layouts.
Technical Context
This bidirectional TVS diode uses planar silicon technology to achieve stable breakdown behavior and low leakage across temperature. Its symmetrical clamping characteristic ensures equal protection for positive and negative transients without polarity dependency.
The device exhibits a nominal standoff voltage (VRM) of 36 V, minimum breakdown voltage (VBR) of 40.0 V at 1 mA, and clamping voltage (VCL) of 58.1 V at 10.3 A (10/1000 µs), with temperature coefficient αT = 10.0 × 10⁻⁴ /°C enabling predictable VCL drift over –55 °C to +150 °C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 600 W - sustains repetitive surges up to this level without degradation under standard test conditions |
| Clamping Voltage (VCL) | 58.1 V at 10.3 A - limits downstream IC voltage stress during 10/1000 µs transients |
| Standoff Voltage (VRM) | 36 V - maximum continuous reverse operating voltage before significant leakage onset |
| Breakdown Voltage (VBR) | 40.0 V min at 1 mA - precise threshold where avalanche conduction begins |
| Leakage Current (IRM) | 0.2 µA max at 25 °C - negligible standby current for battery-powered or low-power sensor nodes |
| Dynamic Resistance (RD) | 1.35 Ω - determines voltage rise per ampere beyond clamping point; critical for fast-rising transients |
| Junction Temperature Range | –55 °C to +150 °C - supports operation in under-hood automotive or industrial SMPS environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, JEDEC-registered outline, 3.3–3.95 mm width × 5.1–5.6 mm length × 1.9–2.45 mm height, matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Transient current sink (bidirectional) | Identifies terminal orientation; in bidirectional configuration, both terminals function identically as symmetric avalanche junctions |
| Anode | Transient current sink (bidirectional) | Electrically identical to cathode; no polarity dependence-used interchangeably in layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Enables single-device protection of AC-coupled or differential lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns |
| Low dynamic resistance (1.35 Ω) | Minimizes voltage overshoot during sub-100 ns transients, improving protection margin for 3.3 V/5 V logic interfaces |
| UL497B recognition (E136224) | Validates use as isolated loop circuit protector in safety-critical industrial control systems requiring agency approval |
| IEC 61000-4-2 level 4 compliance (±30 kV) | Meets highest ESD immunity requirement for end-equipment certification without external shielding or filtering |
| MSL Level 1 rating | Allows unlimited floor life and reflow without baking-reduces manufacturing overhead in high-volume SMT lines |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24 V DC input/output channels in programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between terminal block and interface IC (e.g., ADG467, ISO1212) to limit transient energy before signal conditioning. Use Value: Clamps 4 kV IEC 61000-4-4 surges to ≤58.1 V, protecting 36 V-rated analog front-end components while maintaining <0.2 µA leakage at ambient temperature. |
Use Scenario: LIN bus and sensor supply lines in body electronics subject to load dump and ESD events during service. IC Role / Device Role / Timing Role: Standoff protection device on 12 V supply rails feeding microcontrollers (e.g., SPC56EL60) and Hall-effect sensors. Use Value: Withstands 150 °C junction temperature and maintains ≤1 µA leakage at 85 °C, ensuring long-term reliability in engine bay proximity. |
| Telecom Ethernet PHY Interface | Medical Patient Monitoring Port |
|
Use Scenario: RJ45 connector protection on 10/100BASE-TX PHYs where common-mode surges couple onto differential pairs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across each twisted pair (e.g., TX+/TX−, RX+/RX−) upstream of magnetics and PHY IC (e.g., DP83848). Use Value: Symmetric clamping ensures balanced transient suppression without skewing differential signaling integrity; 1.35 Ω RD preserves signal edge fidelity. |
Use Scenario: External sensor ports (e.g., SpO₂, ECG leads) connected to patient-facing equipment requiring IEC 60601-1-2 ESD immunity. IC Role / Device Role / Timing Role: Primary overvoltage clamp on analog input paths before instrumentation amplifiers (e.g., AD8221) and ADCs. Use Value: UL497B recognition confirms suitability for isolated medical circuits; low leakage avoids baseline drift in high-impedance biopotential measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA from Vishay (SMCJ36CA) | Same SMB package, 58.1 V VCL, but higher IRM (1 µA at 25 °C) and lower thermal derating above 100 °C | Limited to commercial-grade industrial use; not UL497B recognized | Select when cost sensitivity outweighs agency certification and high-temp leakage requirements |
| P6SMB36CA from ON Semiconductor | Identical VRM/VBR/VCL specs, but 400 W (10/1000 µs) rating and higher RD (1.6 Ω), resulting in ~3.5 V higher clamping at 10 A | Suitable only for non-safety-critical consumer applications with relaxed surge margins | Choose only if existing BOM uses P6SMB series and board-level testing confirms adequate protection margin |
Compared with SMBJ36CA-TR, the Vishay alternative lacks UL497B validation and shows elevated leakage at temperature, while the ON Semiconductor part trades peak power and clamping precision for legacy footprint compatibility-neither matches the original's combination of 600 W capability, 1.35 Ω RD, and safety-agency recognition.
Availability
SMBJ36CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom Ethernet PHY interfaces, and medical patient monitoring ports requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SMBJ36CA-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, designing and manufacturing microcontrollers, power devices, sensors, and protection components for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's high-reliability TVS diode product line, engineered specifically for robust electromagnetic immunity in harsh environments-emphasizing low leakage, high-temperature stability, and international safety certifications.
FAQ
What is the difference between SMBJ36A-TR and SMBJ36CA-TR?
SMBJ36A-TR is unidirectional, conducting only in reverse bias and requiring correct polarity placement; SMBJ36CA-TR is bidirectional, offering symmetrical clamping for AC or differential signals without orientation constraints. Both share identical VRM (36 V), VBR (40.0 V min), and VCL (58.1 V), but differ in marking (CUN vs. CBN) and internal junction structure.
Does SMBJ36CA-TR require heatsinking in typical applications?
No dedicated heatsink is required. At 600 W peak (10/1000 µs), thermal energy is too brief for significant junction temperature rise. With Rth(j-a) ≈ 120 °C/W on standard FR4 (70 µm Cu), steady-state dissipation is irrelevant-only PCB copper area under leads (≥2 cm² recommended) affects surge survivability and long-term reliability.
Can SMBJ36CA-TR be used for 48 V DC power rail protection?
Yes-it is rated for 36 V standoff (VRM), providing 20 % margin above 30 V nominal 48 V systems (which operate at ~40–57 V). For direct 48 V rail clamping, SMBJ48CA-TR (VRM = 48 V) is preferred; using SMBJ36CA-TR risks premature conduction during normal voltage transients like load dump.
Is SMBJ36CA-TR compatible with lead-free reflow profiles?
Yes-its matte tin-plated leads comply with J-STD-020 MSL Level 1 and ST's recommended reflow profile: peak temperature 240–245 °C, ramp rate ≤3 °C/s, time above 217 °C ≤60 seconds (max 90 s), with controlled cooling. No pre-bake is needed due to moisture sensitivity level 1 classification.
SMBJ36CA-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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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
SMBJ36CA-TR FAQ
1.How can I place an order for SMBJ36CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ36CA-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 SMBJ36CA-TR reliable?
The price and inventory of SMBJ36CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ36CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ36CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ36CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ36CA-TR?
SMBJ36CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ36CA-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 SMBJ36CA-TR?
For technical support, including SMBJ36CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ36CA-TR requirements.
6.How does Aetrix verify that SMBJ36CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ36CA-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 SMBJ36CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ36CA-TR?
All SMBJ36CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ36CA-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 SMBJ36CA-TR part is unused and in its original packaging.
Return procedure for SMBJ36CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ36CA-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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D5V0P1B2LP-7B
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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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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