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Taiwan Semiconductor Corporation SMBJ70
- Part No.:
- SMBJ70
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70.pdf
- Description:
- 600W, 86.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,740
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Product details
Overview
SMBJ70 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 70V working stand-off voltage (VWM), and 125V maximum clamping voltage (VC) at 5.0A peak impulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ70 datasheet, SMBJ70 pinout, SMBJ70 application, or SMBJ70 equivalent, this device delivers verified clamping performance under 10/1000µs surge waveforms, sub-1ps response time, and <1µA leakage above 10V - critical for ESD-hardened sensor nodes, CAN bus front-ends, and DC-DC converter input protection where low VWM margin and high IPP tolerance are required.
Technical Context
The SMBJ70 employs a glass-passivated silicon junction optimized for fast avalanche breakdown and stable clamping under repetitive transient stress. Its unidirectional configuration provides forward conduction capability with VF = 3.5V at 50A (per SMBJ5.0–SMBJ90 group specification), enabling bidirectional protection when paired with a series diode or used in polarity-aware circuits.
Thermal design is supported by RθJA = 55°C/W and RθJC = 10°C/W, allowing sustained operation up to TJ = +150°C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - confirming suitability for lead-free reflow assembly without popcorn risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe standoff for 72V nominal automotive systems. |
| VBR min/max | 77.8 V / 95.1 V @ IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM while avoiding premature conduction. |
| VC @ IPP | 125 V @ 5.0 A (10/1000µs) - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 2b (inductive load dump). |
| PPK | 600 W - Peak pulse power rating validated per Fig.3 waveform; supports single-event surge immunity in harsh environments. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on vehicle modules and low-power IoT sensors. |
| TJ max | +150 °C - Enables placement near heat-generating components (e.g., power MOSFETs, DC-DC inductors) without derating. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; polarity-sensitive unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to protected circuit ground or low-side return path; establishes reference for clamping action. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., CAN_H, LIN, 12V rail); conducts transient energy to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping speed | Typically <1.0 ps response - enables suppression of nanosecond-scale ESD and EFT pulses before sensitive logic latches. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (load dump), and Pulse 3a/3b (switching noise) - meets OEM automotive EMC requirements. |
| RoHS & halogen-free | Compliant with IEC 61249-2-21 and RoHS Directive 2011/65/EU - supports green manufacturing and end-of-life recycling mandates. |
| Moisture sensitivity | Level 1 per J-STD-020 - allows unlimited floor life and standard SMT reflow without baking preconditioning. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12V/24V supply inputs of body control modules (BCM), infotainment head units, and ADAS ECUs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input capacitor to clamp surges before LDOs or buck controllers. Use Value: 125V clamping at 5A ensures downstream regulators see ≤125V during ISO 7637-2 Pulse 2b (35V/100ms), preventing latch-up or overvoltage shutdown. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD230) against ESD and coupled transients on differential bus lines. IC Role / Device Role / Timing Role: Bidirectional protection achieved using two SMBJ70 devices (anode-to-anode) across CAN_H–CAN_L, leveraging symmetric breakdown. Use Value: Sub-1ps response captures fast EFT bursts (IEC 61000-4-4) before transceiver input stages saturate, maintaining bit error rate integrity. |
| Industrial Sensor Interface Protection | Lighting Driver Input Clamp |
Use Scenario: Shielding 4–20mA analog input circuits and RS-485 PHYs in PLC I/O modules from field-induced surges and lightning-induced coupling. IC Role / Device Role / Timing Role: Placed at connector entry point, upstream of signal conditioning op-amps and isolation barriers. Use Value: 70V VWM aligns with 48V industrial bus standards while providing ≥7.8V margin above max operating voltage, minimizing false triggering. |
Use Scenario: Suppressing inductive kickback from LED driver MOSFETs and relay coils in smart streetlight controllers and architectural lighting systems. IC Role / Device Role / Timing Role: Mounted across driver output terminals to absorb stored inductor energy during switch-off transitions. Use Value: 600W PPK rating handles 100mJ single-pulse energy (per 10/1000µs), preventing MOSFET avalanche failure during frequent PWM dimming cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ70A | Same DO-214AC (SMA) package; VWM = 70V, VC = 113V @ 5.5A; lower clamping voltage but 400W PPK rating. | Better clamping ratio (VC/VWM = 1.61 vs. 1.79), but lower surge capacity limits use in high-energy load-dump scenarios. | Select SMAJ70A only when board space permits SMA footprint and system-level surge energy is ≤400W. |
| ON Semiconductor 1.5SMC70A | DO-214AB (SMC) package; VWM = 70V, VC = 113V @ 5.5A; 1500W PPK rating but larger footprint and higher thermal mass. | Higher surge handling supports repeated load dump events but requires larger PCB area and impacts layout density. | Choose 1.5SMC70A when long-term reliability under cyclic transients outweighs size constraints - not drop-in compatible with SMB footprint. |
Compared with SMAJ70A and 1.5SMC70A, SMBJ70 offers optimal balance of 600W surge capacity, SMB footprint compatibility, and 125V clamping - making it preferred for space-constrained automotive modules requiring ISO 7637-2 compliance without overspec'ing thermal mass or board area.
Availability
SMBJ70 is available at Aetrix Electronics and suitable for automotive electronics, industrial I/O protection, and LED lighting systems requiring stable component supply, full traceability, and lifecycle continuity assurance.
Supply support for SMBJ70 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs - serving automotive, industrial, and consumer markets since 1979.
The SMBJ series was engineered specifically for AEC-Q101-compliant transient protection in harsh automotive environments, emphasizing robust clamping consistency, low leakage, and high-reliability packaging for under-hood and chassis-mounted electronics.
FAQ
What is the maximum clamping voltage of SMBJ70 under standard test conditions?
The SMBJ70 has a maximum clamping voltage (VC) of 125 V when subjected to a 10/1000 µs surge waveform at 5.0 A peak impulse current (IPP), as specified in the Electrical Specifications table on page 3 of the Taiwan Semiconductor SMBJ Series datasheet R2104. This value ensures predictable overvoltage limiting during ISO 7637-2 Pulse 2b events. The SMBJ70 maintains this clamping performance across its qualified operating temperature range.
Is SMBJ70 suitable for bidirectional transient protection?
The SMBJ70 is a unidirectional TVS diode and is not inherently bidirectional. However, it can be used in bidirectional configurations - for example, by connecting two SMBJ70 devices anode-to-anode across a differential line like CAN_H/CAN_L. For native bidirectional operation, the SMBJ70C variant (with C suffix) is specified, offering symmetrical breakdown in both directions. Always verify polarity alignment during PCB layout to avoid forward conduction during normal operation.
What is the leakage current specification for SMBJ70 at its working stand-off voltage?
The SMBJ70 exhibits a maximum blocking leakage current (ID) of 1 µA at its working stand-off voltage (VWM) of 70 V, measured at TA = 25°C. This ultra-low leakage supports energy-sensitive applications such as battery-backed sensors and always-on vehicle modules. Leakage remains well below 1 µA up to 80% of VWM, ensuring minimal standby power loss in precision analog circuits.
Does SMBJ70 meet automotive qualification standards?
While the SMBJ70 itself is not individually AEC-Q101 certified in this documentation, the SMBJ series is designed and tested to meet key automotive stress requirements including ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, and is manufactured using processes aligned with AEC-Q101 test conditions. Customers implementing SMBJ70 in automotive systems must perform full component-level qualification per their OEM's requirements - Taiwan Semiconductor provides full characterization data to support that validation.
What is the thermal resistance from junction to ambient for SMBJ70?
The SMBJ70 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single device on 1-inch² copper pad). This value assumes typical PCB layout with adequate copper pour; actual thermal performance improves with enhanced heatsinking or multiple thermal vias. Combined with its 150°C maximum junction temperature, this RθJA enables reliable operation in ambient temperatures up to +105°C when power dissipation remains within steady-state limits.
SMBJ70 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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:
- 125V
- Current - Peak Pulse (10/1000µs):
- 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:
- DO-214AA (SMB)
SMBJ70 FAQ
1.How can I place an order for SMBJ70 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70 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 SMBJ70 reliable?
The price and inventory of SMBJ70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70 is usually 5 days.
3.What payment methods are accepted for SMBJ70?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70?
SMBJ70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70 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 SMBJ70?
For technical support, including SMBJ70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70 requirements.
6.How does Aetrix verify that SMBJ70 is sourced from the original manufacturer or authorized distributors?
All SMBJ70 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 SMBJ70 meets industry standards.
7.What is the process for return or replacement of SMBJ70?
All SMBJ70 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70, 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 SMBJ70 part is unused and in its original packaging.
Return procedure for SMBJ70:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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