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STMicroelectronics SMBJ70A-TR
- Part No.:
- SMBJ70A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70A-TR.pdf
- Description:
- TVS DIODE 70VWM 113VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:24,288
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Product details
Overview
SMBJ70A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for robust ESD and surge protection of signal/power lines. It features 70 V standoff voltage (VRM), 113 V clamping voltage at 5.5 A (10/1000 µs), 600 W peak pulse power, 0.2 µA max leakage at 25 °C, and 150 °C operating junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMBJ70A-TR datasheet, SMBJ70A-TR pinout, SMBJ70A-TR application, or SMBJ70A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, thermal derating at elevated ambient, IEC 61000-4-2/4-4 compliance level, and unidirectional polarity alignment with DC-biased lines.
Technical Context
This TVS diode uses planar silicon junction technology to achieve low leakage (<0.2 µA @ 25 °C) and stable clamping performance across -55 °C to +150 °C junction temperature range. Its dynamic resistance of 2.22 Ω (at 8/20 µs) ensures predictable voltage overshoot during fast transients.
The device meets IEC 61000-4-2 Level 4 (30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), with UL497B recognition (E136224) for isolated loop circuit protection - confirming suitability for safety-critical secondary-side surge suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 70 V - maximum continuous reverse operating voltage before breakdown; sets minimum system DC bias compatibility. |
| Breakdown Voltage (VBR min) | 77.8 V @ 1 mA - guaranteed conduction onset; ensures reliable triggering above normal line voltage. |
| Clamping Voltage (VCL) | 113 V @ 5.5 A (10/1000 µs) - peak voltage seen by protected circuit during surge; defines safe margin vs. IC absolute max rating. |
| Peak Pulse Power (PPP) | 600 W @ 10/1000 µs - energy-handling capability under standard lightning surge waveform; derates to 350 W at Tj = 150 °C. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - minimal loading on high-impedance signal paths; critical for battery-powered sensor interfaces. |
| Junction Temperature Range | -55 °C to +150 °C - enables deployment in under-hood automotive or industrial SMPS environments without thermal shutdown. |
| Package | SMB (DO-214AA) - standardized surface-mount outline (JEDEC registered); compatible with IPC-7531 footprint and automated assembly. |
Pinout & Package
SMBJ70A-TR is housed in an SMB (DO-214AA) plastic package with two terminals: cathode (marked band) and anode. The package measures 3.3–3.95 mm (D) × 5.1–5.6 mm (E) × 1.9–2.45 mm (A1) and uses matte tin-plated leads compliant with J-STD-002 and MIL-STD-750.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when voltage exceeds VBR. |
| Anode | Reference node | Tied to system ground or lower-potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 Level 4 compliance | 30 kV air/contact discharge - eliminates need for external ESD staging in USB, CAN, or RS-485 interfaces. |
| UL497B recognition (E136224) | Validated for isolated loop protection - supports safety-certified designs in industrial PLC I/O modules. |
| Low dynamic resistance (2.22 Ω) | Minimizes VCL rise under high di/dt surges - preserves timing integrity in high-speed data lines. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - simplifies SMT procurement and eliminates bake requirements. |
| Planar junction construction | Enables stable leakage and clamping over 150 °C - extends reliability in thermally constrained DC-DC converters. |
Applications
| Industrial Power Supply Input | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients before DC-DC controller input. Use Value: Clamps 10/1000 µs surges to ≤113 V, protecting 36 V-rated input MOSFETs and maintaining regulation during ISO 7637-2 Pulse 5a events. |
Use Scenario: LIN bus transceiver power rail in door module subjected to ESD from user contact and battery reversal. IC Role / Device Role / Timing Role: Standoff-rated TVS on VCC line to absorb 30 kV contact discharge per IEC 61000-4-2. Use Value: Sub-µA leakage avoids quiescent current penalty; 150 °C rating sustains operation near motor drivers without derating. |
| Telecom PoE Interface | Medical Sensor Signal Line |
|
Use Scenario: Secondary-side 48 V DC power feed in IEEE 802.3af/at powered device (PD) facing surge coupling from Ethernet magnetics. IC Role / Device Role / Timing Role: Primary overvoltage clamp on PD controller input, coordinated with upstream MOV and fuse. Use Value: 600 W PPP handles combined lightning-induced surges; UL497B recognition supports UL 60950-1/62368-1 certification. |
Use Scenario: Analog front-end of patient-worn ECG monitor with high-impedance electrode inputs vulnerable to ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential signal pair (RA/LA) referenced to shield ground. Use Value: 0.2 µA leakage prevents baseline drift; fast response (<1 ns) avoids signal distortion during clinical handling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA-TR | Bidirectional; symmetric clamping (±113 V); higher capacitance due to dual-junction structure. | Required for AC-coupled or floating signal lines (e.g., RS-485, audio), not DC-biased rails. | Select only if bidirectional protection is mandated by signal topology - adds no benefit on unidirectional 24 V lines. |
| SMCJ70A-TR | Same VRM/VBR but in larger SMC package; 1500 W PPP (10/1000 µs); 1.5× footprint area. | Used where higher surge energy (e.g., outdoor telecom) exceeds SMBJ70A's 600 W limit. | Choose when system-level testing reveals repeated clamping events >600 W - otherwise SMBJ70A saves board space and cost. |
Compared with SMBJ70CA-TR and SMCJ70A-TR, SMBJ70A-TR delivers optimal balance of compact SMB footprint, precise unidirectional clamping, and certified 600 W surge immunity - making it the preferred choice for space-constrained DC power rail protection where polarity is fixed and energy demands are moderate.
Availability
SMBJ70A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom PoE interfaces, and medical sensor signal conditioning requiring stable component supply and full compliance traceability.
Supply support for SMBJ70A-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, specializing in power management, analog, MEMS, and microcontrollers - with vertical manufacturing and broad automotive/industrial qualification coverage.
SMBJ series TVS diodes belong to ST's protection portfolio, engineered specifically for high-reliability DC power and signal line surge suppression in harsh environments - emphasizing low leakage, thermal stability, and international safety certifications.
FAQ
What is the maximum clamping voltage of SMBJ70A-TR under a 10/1000 µs surge?
The maximum clamping voltage is 113 V at 5.5 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature at a coefficient of 10.5 × 10−4/°C, reaching ~122 V at Tj = 150 °C - a critical factor when sizing protected IC voltage margins.
Can SMBJ70A-TR be used in bidirectional signal lines like RS-485?
No - SMBJ70A-TR is unidirectional and will conduct only in reverse bias. For RS-485 or other AC-coupled or floating differential pairs, the bidirectional SMBJ70CA-TR must be used to clamp both positive and negative transients symmetrically.
How does SMBJ70A-TR's leakage current affect battery-powered applications?
Its maximum leakage is 0.2 µA at 25 °C and 1 µA at 85 °C - negligible for most battery systems. In a 10-year shelf-life medical sensor with 200 µA sleep current, this adds <0.1% drain, avoiding premature battery depletion while maintaining signal integrity.
Is SMBJ70A-TR compliant with lead-free reflow standards?
Yes - it is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a peak reflow temperature of 240–245 °C (60 sec max dwell). The matte tin-plated leads meet JESD 22-B102 E3 and MIL-STD-750 Method 2026, ensuring solder joint reliability in high-volume SMT lines.
SMBJ70A-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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
SMBJ70A-TR FAQ
1.How can I place an order for SMBJ70A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70A-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 SMBJ70A-TR reliable?
The price and inventory of SMBJ70A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ70A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70A-TR?
SMBJ70A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70A-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 SMBJ70A-TR?
For technical support, including SMBJ70A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70A-TR requirements.
6.How does Aetrix verify that SMBJ70A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ70A-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 SMBJ70A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ70A-TR?
All SMBJ70A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70A-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 SMBJ70A-TR part is unused and in its original packaging.
Return procedure for SMBJ70A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70A-TR Tags
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