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Taiwan Semiconductor Corporation SMBJ70C
- Part No.:
- SMBJ70C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ70C.pdf
- Description:
- 600W, 86.5V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,744
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Product details
Overview
SMBJ70C from Taiwan Semiconductor is a bi-directional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 70V working stand-off voltage (VWM), 125V maximum clamping voltage (VC) at 5.0A peak impulse current, and 600W peak pulse power dissipation with 10/1000µs waveform - deployed in automotive lighting control modules to protect CAN transceivers from load-dump and EFT transients.
For engineers reviewing the SMBJ70C datasheet, SMBJ70C pinout, SMBJ70C application, or SMBJ70C equivalent, key selection criteria include bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package thermal performance (RθJA = 55°C/W), and leakage current ≤1µA at 70V.
Technical Context
The SMBJ70C operates as a bi-directional avalanche diode, exhibiting symmetrical breakdown behavior in both polarities with VBR min/max of 77.8V/95.1V at 1mA test current. Its glass-passivated junction ensures stable leakage (<1µA at VWM) and fast response (<1.0ps), enabling effective suppression of ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) events.
Thermally, it supports junction temperatures from –55°C to +150°C, with RθJC = 10°C/W and RθJA = 55°C/W, allowing reliable operation under sustained ambient conditions up to 125°C when mounted on standard FR-4 PCBs with recommended pad layout per DO-214AA outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR (min/max) | 77.8 / 95.1 V @ 1 mA - Ensures predictable turn-on margin above VWM for robust overvoltage detection |
| VC @ IPP | 125 V @ 5.0 A - Limits downstream IC voltage during 10/1000µs surge, protecting 100V-rated components |
| PPK | 600 W - Sustains single-pulse energy up to 600W without failure, meeting ISO 7637-2 Pulse 5a requirements |
| ID @ VWM | <1 µA - Minimizes standby power loss and avoids false triggering in low-current sensor circuits |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated placement and reflow |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional SMBJ70C; terminals are symmetrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output - no polarity dependency; connects across protected line and ground or differential pair |
| Case | Non-conductive housing | No electrical connection; provides mechanical support and UL 94V-0 flame resistance |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN FD) without polarity concerns |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 5a), supply transients (Pulse 1/2a/2b), and coupling noise (Pulse 3a/3b) |
| Fast response time | <1.0 ps junction response ensures clamping initiates before sensitive logic or analog circuitry sustains damage |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, reducing manufacturing cost and process complexity |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant industrial and automotive production |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp control units subjected to battery load-dump pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp transients before they reach 5V/3.3V regulators. Use Value: Limits peak voltage to 125V during 600W surges, preventing latch-up or gate oxide rupture in downstream MOSFET drivers. | Use Scenario: Safeguarding 24V digital input channels on programmable logic controllers exposed to relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: Connected across input terminal and common reference to absorb repetitive 10/1000µs transients up to 5kV. Use Value: Maintains <1µA leakage at 24V nominal, avoiding false state detection while clamping to ≤125V during surge events. |
| RS-485 Data Line Protection | Smart Meter Power Supply Input |
Use Scenario: Shielding half-duplex RS-485 transceivers in utility meter communication interfaces from induced lightning surges. IC Role / Device Role / Timing Role: Placed differentially across A/B lines and common-mode to ground to suppress both differential and common-mode transients. Use Value: Symmetrical VBR (77.8–95.1V) ensures balanced clamping, preserving signal integrity and meeting IEC 61000-4-5 Level 3 (1kV line-earth) | Use Scenario: Guarding AC-DC converter primary-side inputs in smart electricity meters against mains-borne surges and switching transients. IC Role / Device Role / Timing Role: Mounted across rectified DC bus and ground to limit overvoltage during 600W 10/1000µs impulses. Use Value: Withstands repeated surges up to 125V clamping level, extending electrolytic capacitor lifetime and preventing controller reset. |
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 (Littelfuse) | Identical VWM (70V), VBR (77.8–95.1V), VC (125V), and DO-214AA package; same ISO 7637-2 compliance | No functional difference; validated in identical automotive and industrial surge test setups | Drop-in replacement with identical marking code format and tape-and-reel packaging (3,000 pcs/reel) |
| P6SMB70CA (ON Semiconductor) | VWM = 70V, VBR = 77.8–95.1V, VC = 125V, same DO-214AA package; meets ISO 7637-2 but rated at 600W PPK only up to TA = 25°C | Slightly lower thermal derating margin above 85°C ambient due to higher RθJA (60°C/W vs. 55°C/W) | Suitable where ambient stays below 85°C; verify layout thermal relief if used in enclosed enclosures |
Compared with SMBJ70C, SMBJ70CA offers identical electrical and mechanical specs with seamless supply chain redundancy, while P6SMB70CA provides comparable clamping but requires thermal validation in high-ambient designs.
Availability
SMBJ70C is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and RS-485 data line protection requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for SMBJ70C 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, headquartered in Hsinchu, Taiwan.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low leakage, and robust DO-214AA packaging.
FAQ
What is the clamping voltage of SMBJ70C at its rated peak pulse current?
The SMBJ70C has a maximum clamping voltage (VC) of 125 V at 5.0 A peak impulse current (IPP) with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures downstream components see no more than 125 V during surge events. The SMBJ70C maintains this clamping performance across its specified operating temperature range.
Is SMBJ70C unidirectional or bidirectional, and how is polarity marked?
SMBJ70C is a bi-directional TVS diode, meaning it clamps symmetrically for both positive and negative transients - no cathode band or polarity marking is present. Unlike unidirectional variants (e.g., SMBJ70A), the "C" suffix explicitly denotes bidirectional functionality. This makes SMBJ70C ideal for AC-coupled or floating signal paths where voltage reversals occur, such as RS-485 or CAN bus lines.
Does SMBJ70C meet automotive surge immunity standards?
Yes, SMBJ70C meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery line transients), and Pulse 3a/3b (capacitive coupled noise). Its 600W peak pulse power rating and 125V clamping voltage are validated under these waveforms. The SMBJ70C is widely deployed in automotive body control modules and lighting systems requiring AEC-Q101-aligned surge protection.
What is the maximum leakage current of SMBJ70C at its working voltage?
The SMBJ70C exhibits a maximum blocking leakage current (ID) of 1 µA at its working stand-off voltage (VWM) of 70 V, measured at 25°C. This ultra-low leakage prevents excessive standby power draw and avoids false triggering in high-impedance sensing circuits. The SMBJ70C maintains <5 µA leakage even at elevated temperatures up to 125°C, supporting reliable operation in harsh environments.
Can SMBJ70C be used in place of SMBJ70A in a design?
No - SMBJ70C and SMBJ70A are not interchangeable without circuit review. SMBJ70A is unidirectional (cathode-marked) and intended for DC rail protection with defined polarity; SMBJ70C is bidirectional and lacks polarity marking. Substituting SMBJ70C for SMBJ70A may cause unintended conduction in reverse-biased configurations. Always verify schematic polarity and transient directionality before selecting SMBJ70C.
SMBJ70C 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ70C FAQ
1.How can I place an order for SMBJ70C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ70C 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 SMBJ70C reliable?
The price and inventory of SMBJ70C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ70C is usually 5 days.
3.What payment methods are accepted for SMBJ70C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ70C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ70C?
SMBJ70C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ70C 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 SMBJ70C?
For technical support, including SMBJ70C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ70C requirements.
6.How does Aetrix verify that SMBJ70C is sourced from the original manufacturer or authorized distributors?
All SMBJ70C 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 SMBJ70C meets industry standards.
7.What is the process for return or replacement of SMBJ70C?
All SMBJ70C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ70C, 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 SMBJ70C part is unused and in its original packaging.
Return procedure for SMBJ70C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ70C Tags
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