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Taiwan Semiconductor Corporation SMBJ75C
- Part No.:
- SMBJ75C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75C.pdf
- Description:
- 600W, 92.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,492
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Product details
Overview
SMBJ75C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 75 V working stand-off voltage (VWM), 134 V maximum clamping voltage (VC@IPP) at 4.7 A peak impulse current, and 600 W peak pulse power rating with DO-214AA (SMB) package - used in automotive lighting control modules to protect CAN transceivers from load-dump-induced transients.
For engineers reviewing the SMBJ75C datasheet, SMBJ75C pinout, SMBJ75C application, or SMBJ75C equivalent, key selection criteria include bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, junction-to-ambient thermal resistance of 55 °C/W, and moisture sensitivity level 1 per J-STD-020 - all critical for under-hood automotive electronics reliability.
Technical Context
The SMBJ75C implements a silicon avalanche diode structure with glass-passivated junction, enabling sub-1 ps response time and stable breakdown behavior across temperature. Its bidirectional configuration ensures symmetrical clamping in AC-coupled or floating signal paths without polarity dependency.
Designed for unidirectional and bidirectional surge suppression, it meets ISO 7637-2 test requirements for automotive electrical systems and supports steady-state power dissipation up to 3 W at 25 °C ambient, with junction temperature rated from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 83.3 V / 102 V @ 1 mA - Ensures reliable turn-on above normal operating voltage while avoiding false triggering |
| VC@IPP | 134 V @ 4.7 A (10/1000 µs waveform) - Limits downstream voltage stress during worst-case surge events |
| PPK | 600 W - Sustains high-energy transients such as ISO 7637-2 Pulse 5a (load dump) |
| ID@VWM | ≤1 µA - Minimizes standby power loss and avoids interference in high-impedance sensing circuits |
| TJ max | +150 °C - Enables operation in under-hood environments without derating below full power |
| RθJA | 55 °C/W - Defines thermal design margin for PCB copper area and airflow requirements |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path terminal | Both terminals function identically; no polarity marking required - simplifies layout and eliminates orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses (e.g., RS-485, CAN FD differential pairs) without external polarity management |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/connect), and Pulse 3a/3b (capacitive coupling) - meets OEM automotive EMC requirements |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; eliminates baking requirement and reduces manufacturing overhead |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and export compliance |
| Fast response time | <1.0 ps - Clamps before transient energy couples into protected IC inputs, preventing latch-up or gate oxide damage |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp modules subjected to load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Bidirectional TVS placed across 12 V supply rail upstream of DC-DC converter input. Use Value: Clamps 134 V at 4.7 A to prevent overvoltage shutdown or destruction of buck controller during 35 V–40 V sustained load-dump events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Parallel-connected TVS at field-side connector interface, shunting surge energy before optocoupler input stage. Use Value: Limits transient voltage to ≤134 V within 1 ps, preserving isolation barrier integrity and preventing false triggering of input latching logic. |
| Automotive Body Control Module | RS-485 Communication Line |
Use Scenario: Protecting LIN bus transceivers and power window motor drivers against battery reverse connection and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS across VBAT and GND near connector entry point in BCM subassembly. Use Value: Withstands 600 W peak pulses and maintains ≤1 µA leakage at 75 V, ensuring low quiescent current in always-on vehicle networks. |
Use Scenario: Shielding RS-485 transceivers in building automation systems from EFT (electrical fast transients) and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Differential-mode TVS across A/B lines, referenced to local ground with minimal parasitic inductance. Use Value: Symmetrical 134 V clamping protects both polarities of differential signaling, maintaining common-mode rejection and data integrity during 4 kV EFT bursts. |
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 SMAJ75CA | Same DO-214AC (SMA) package; 134 V VC@IPP, but 400 W PPK rating and higher RθJA (65 °C/W) | Lower power handling limits use in high-repetition surge environments like industrial motor drives | Select when footprint compatibility with SMA layout exists and thermal budget allows higher junction rise |
| ON Semiconductor 1.5SMC75CA | DO-214AB (SMC) package; identical 75 V VWM and 134 V VC, but 1500 W PPK and 2.5× larger footprint | Supports higher single-pulse energy but requires PCB redesign; unsuitable for space-constrained automotive modules | Choose for legacy SMC-based designs needing higher surge margin without changing protection topology |
Compared with SMBJ75C, SMAJ75CA offers smaller size but reduced surge capacity and thermal performance, while 1.5SMC75CA delivers greater robustness at the cost of board area - SMBJ75C uniquely balances 600 W capability, SMB footprint, and automotive-grade qualification in one package.
Availability
SMBJ75C is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and RS-485 communication line protection requiring stable component supply across multi-year production cycles.
Supply support for SMBJ75C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMBJ series was developed specifically for AEC-Q101-qualified surface-mount surge protection in harsh-environment automotive ECUs, emphasizing ISO 7637-2 compliance, MSL-1 handling, and tight parametric consistency across voltage grades.
FAQ
What is the clamping voltage of SMBJ75C under standard 10/1000 µs surge conditions?
The SMBJ75C has a maximum clamping voltage (VC) of 134 V when subjected to a 4.7 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains within safe operating voltage limits during defined surge events - a critical parameter confirmed in Taiwan Semiconductor's R2104 datasheet, page 3.
Is SMBJ75C unidirectional or bidirectional, and how does that affect PCB layout?
SMBJ75C is a bidirectional TVS diode, indicated by the "C" suffix per Taiwan Semiconductor's ordering convention. It has no polarity marking or cathode band, allowing placement in either orientation on the PCB - eliminating orientation checks during automated assembly and simplifying layout for symmetric protection of AC-coupled or floating nodes like RS-485 differential pairs.
Does SMBJ75C meet automotive EMC standards such as ISO 7637-2?
Yes, SMBJ75C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements per Taiwan Semiconductor's datasheet (page 1). Its 600 W peak pulse power, fast <1 ps response, and controlled clamping behavior make it suitable for protecting automotive body control modules, lighting systems, and infotainment interfaces against conducted transients.
What is the maximum steady-state power dissipation for SMBJ75C at room temperature?
SMBJ75C has a steady-state power dissipation (PD) rating of 3 W at TA = 25 °C, as specified in the Absolute Maximum Ratings table (page 1 of R2104 datasheet). This defines the continuous power it can safely dissipate without exceeding its 150 °C maximum junction temperature - important for thermal design in enclosed automotive enclosures.
How does the moisture sensitivity level (MSL) of SMBJ75C impact manufacturing handling?
SMBJ75C is rated MSL-1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering. This eliminates moisture-related popcorning risk and streamlines SMT line integration - a key advantage for high-volume automotive electronics assembly where process reliability is critical.
SMBJ75C 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 4.7A
- 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)
SMBJ75C FAQ
1.How can I place an order for SMBJ75C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75C 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 SMBJ75C reliable?
The price and inventory of SMBJ75C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75C is usually 5 days.
3.What payment methods are accepted for SMBJ75C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75C?
SMBJ75C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75C 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 SMBJ75C?
For technical support, including SMBJ75C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75C requirements.
6.How does Aetrix verify that SMBJ75C is sourced from the original manufacturer or authorized distributors?
All SMBJ75C 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 SMBJ75C meets industry standards.
7.What is the process for return or replacement of SMBJ75C?
All SMBJ75C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75C, 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 SMBJ75C part is unused and in its original packaging.
Return procedure for SMBJ75C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ75C Tags
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