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STMicroelectronics SMBJ70CA-TR
- Part No.:
- SMBJ70CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70CA-TR.pdf
- Description:
- TVS DIODE 70VWM 113VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,895
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Product details
Overview
SMBJ70CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for surge protection of sensitive electronics against ESD (IEC 61000-4-2, ±30 kV air/contact), EFT (IEC 61000-4-4 Level 4, 4 kV), and inductive switching transients. It features a 70 V stand-off voltage (VRM), 113 V clamping voltage (VCL) at 5.5 A (10/1000 µs), 600 W peak pulse power, and SMB package with matte tin-plated leads.
For engineers reviewing the SMBJ70CA-TR datasheet, SMBJ70CA-TR pinout, SMBJ70CA-TR application, or SMBJ70CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA @ 25 °C), high junction temperature rating (150 °C), UL497B recognition (E136224), and compatibility with IPC7531 footprints for robust PCB-level surge immunity design.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse (or forward, in bidirectional mode) transient voltage exceeds its breakdown threshold (77.8–81.9 V at 1 mA), it avalanches rapidly (<1 ns response) to divert surge current away from downstream ICs or MOSFETs. Its planar silicon construction ensures stable leakage and thermal performance up to 150 °C junction temperature.
The device complies with IEC 61000-4-2 (±30 kV), IEC 61000-4-4 (4 kV), and UL497B for isolated loop circuit protection. Its dynamic resistance (RD = 2.22 Ω) and clamping ratio (VCL/VBR ≈ 1.45) are optimized for fast, low-voltage overshoot suppression on signal lines, DC power rails, and interface ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 70 V - Maximum continuous reverse operating voltage before conduction begins. |
| Breakdown Voltage (VBR) | 77.8–81.9 V @ 1 mA - Confirmed avalanche initiation range ensuring reliable turn-on margin. |
| Clamping Voltage (VCL) | 113 V @ 5.5 A (10/1000 µs) - Peak voltage seen by protected circuit during rated surge. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained surge energy handling capability at 25 °C ambient. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimal standby power loss and signal integrity impact. |
| Junction Temperature (Tj) | -55 to +150 °C - Enables operation in industrial and automotive under-hood environments. |
| Dynamic Resistance (RD) | 2.22 Ω - Low impedance during clamping reduces voltage overshoot and improves protection fidelity. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal bidirectional configuration. Dimensions per JEDEC MS-012AC: length 4.58 mm, width 3.94 mm, height 2.29 mm; recommended footprint per IPC7531.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Anode/Cathode reference for bidirectional symmetry | No polarity distinction-both terminals function identically; marking indicates standard orientation for automated placement. |
| Anode (Opposite Band) | Anode/Cathode reference for bidirectional symmetry | Electrically identical to cathode terminal; enables symmetrical clamping across AC or floating signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal lines without polarity constraints. |
| UL497B recognition (E136224) | Validates suitability for isolated loop circuits in telecom, industrial I/O, and process control systems requiring safety agency approval. |
| Low leakage at elevated temperature | 1 µA @ 85 °C ensures minimal loading on high-impedance sensor inputs or precision analog front-ends. |
| Matte tin-plated leads (MSL Level 1) | Supports lead-free reflow (240–245 °C) without solderability degradation or whisker risk per JESD201 Class 2. |
| High surge robustness (4 kW @ 8/20 µs) | Withstands lightning-induced surges and heavy-inductive switch-offs in power supply and motor drive interfaces. |
Applications
| Industrial PLC Analog Inputs | Automotive CAN Bus Protection |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop sensors and RTD inputs from field wiring transients and ESD events during maintenance. IC Role / Device Role / Timing Role: Shunt clamping element placed across input terminals to limit voltage excursion to ≤113 V during 5.5 A surges. Use Value: Prevents damage to precision op-amps and ADCs while maintaining <0.2 µA leakage to preserve 16-bit measurement accuracy. | Use Scenario: Safeguarding CANH/CANL differential pair against ESD (±30 kV) and load-dump-induced spikes in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp connected between CANH and CANL to suppress common-mode transients without disrupting bus signaling. Use Value: Maintains CAN FD bit timing integrity by limiting clamping overshoot to 113 V and enabling sub-nanosecond response to fast ESD events. |
| Telecom DSL Line Interface | AC-DC SMPS Input Stage |
Use Scenario: Shielding ADSL/VDSL line drivers and transformers from lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: Primary surge limiter mounted at line entry point, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Handles 4 kW (8/20 µs) surges while providing low dynamic resistance (2.22 Ω) to reduce let-through energy to downstream GDT and filter components. | Use Scenario: Protecting bridge rectifier outputs and bulk capacitor inputs from AC line surges and switching transients in offline power supplies. IC Role / Device Role / Timing Role: Parallel-connected clamping device across DC bus to clamp overvoltage spikes before they reach PWM controller ICs. Use Value: Operates reliably at 150 °C junction temperature, sustaining 350 W clamping power at max Tj to ensure protection continuity during sustained overload conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA from Vishay (SMBJ70CA-E3/5BT) | Identical VRM (70 V), VBR (77–82 V), VCL (113 V), and SMB package; RD = 2.2 Ω vs. ST's 2.22 Ω. | No functional difference in clamping performance or thermal derating; same UL497B recognition status. | Select based on distributor stock availability and traceability requirements-both meet identical IEC/UL specs. |
| P6SMB70CA from ON Semiconductor | Slightly higher VCL (115 V @ 5.5 A), same VRM and package; RD = 2.4 Ω; lower PPP (600 W same, but 8/20 µs rating unspecified). | Marginally reduced clamping efficacy may increase stress on downstream 100 V-rated components in high-energy surge scenarios. | Prefer SMBJ70CA-TR where strict VCL budget (<113 V) or 4 kW (8/20 µs) compliance is required. |
Compared with Vishay SMBJ70CA-E3/5BT, ST's version offers identical electrical performance and certification; versus ON Semi P6SMB70CA, ST provides tighter clamping voltage control and verified 4 kW surge capability-critical for IEC 61000-4-4 Level 4 and telecom surge immunity.
Availability
SMBJ70CA-TR is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive CAN bus protection, telecom DSL line interfaces, and AC-DC SMPS input stages requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ70CA-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 high-reliability board-level surge immunity in harsh electromagnetic environments-emphasizing low leakage, high Tj operation, and agency-certified robustness.
FAQ
What is the maximum clamping voltage of SMBJ70CA-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 25 °C ambient. This value increases linearly with junction temperature using αT = 10.5 × 10⁻⁴/°C, reaching ~122 V at 150 °C Tj.
Does SMBJ70CA-TR require orientation during PCB placement?
No. As a bidirectional TVS diode, SMBJ70CA-TR has no functional polarity-both terminals are electrically identical. The band marking indicates standard orientation for automated pick-and-place but does not affect electrical performance.
Is SMBJ70CA-TR compliant with lead-free reflow standards?
Yes. It features matte tin-plated leads qualified to J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 245 °C, meeting IPC/JEDEC profiles for lead-free assembly without solderability degradation or whisker formation.
How does SMBJ70CA-TR differ from unidirectional SMBJ70A-TR?
SMBJ70CA-TR provides symmetrical clamping for both polarities, making it suitable for AC, differential, or floating nodes; SMBJ70A-TR clamps only in reverse bias and conducts forward current like a rectifier, limiting use to DC rail protection with defined polarity.
SMBJ70CA-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):
- 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
SMBJ70CA-TR FAQ
1.How can I place an order for SMBJ70CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70CA-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 SMBJ70CA-TR reliable?
The price and inventory of SMBJ70CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ70CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70CA-TR?
SMBJ70CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70CA-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 SMBJ70CA-TR?
For technical support, including SMBJ70CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70CA-TR requirements.
6.How does Aetrix verify that SMBJ70CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ70CA-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 SMBJ70CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ70CA-TR?
All SMBJ70CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70CA-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 SMBJ70CA-TR part is unused and in its original packaging.
Return procedure for SMBJ70CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70CA-TR Tags
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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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