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Taiwan Semiconductor Corporation SMBJ30C
- Part No.:
- SMBJ30C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30C.pdf
- Description:
- 600W, 37V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:9,460
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Product details
Overview
SMBJ30C from Taiwan Semiconductor is a bi-directional 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 30 V working stand-off voltage (VWM), 53.5 V maximum clamping voltage (VC@IPP) at 11.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive lighting control, industrial I/O interfaces, and USB port ESD hardening.
For engineers reviewing the SMBJ30C datasheet, SMBJ30C pinout, SMBJ30C application, or SMBJ30C equivalent, key selection criteria include bidirectional clamping symmetry, sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA @ 30 V), and DO-214AA (SMB) package compatibility with automated SMT assembly.
Technical Context
The SMBJ30C operates as a bi-directional avalanche diode, symmetrically clamping transients above ±33.3 V (min VBR) and below ±30 V (VWM) in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low leakage, while its thermal resistance (RθJA = 55 °C/W) supports operation up to +150 °C junction temperature under transient stress.
It delivers 11.7 A peak impulse current (IPP) at 10/1000 µs, clamping to ≤53.5 V - enabling robust protection of 3.3 V, 5 V, and 24 V systems without overvoltage stress on downstream ICs. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse/forward voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 33.3 / 40.7 V - Breakdown occurs within this range at 1 mA test current; ensures reliable turn-on before system damage threshold. |
| VC@IPP | 53.5 V - Clamped voltage at 11.7 A peak pulse; limits stress on protected ICs during ISO 7637-2 Pulse 2b (inductive load dump). |
| PPK | 600 W - Peak pulse power handling with 10/1000 µs waveform; sufficient for automotive load-dump and EFT immunity. |
| ID@VWM | <1 µA - Extremely low leakage at rated stand-off; avoids power loss or false triggering in battery-powered sensors. |
| Response time | <1.0 ps - Sub-picosecond avalanche response enables protection against fast ESD events (IEC 61000-4-2 Contact ±8 kV). |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with IPC-7351B footprint and reflow profiles. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode band marking polarity for unidirectional variants; SMBJ30C is bi-directional and marked with "MH" code - no cathode band required. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | Identical electrical behavior in either polarity; connected across protected line and ground (or between differential lines) without orientation dependency. |
| Case | Non-electrical mechanical body | UL 94V-0 rated molding compound; provides flame resistance and mechanical stability during reflow and board flexure. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled signals or floating buses (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (supply line transients), and Pulse 3a/3b (switching noise) - critical for automotive ECUs. |
| Sub-1 ps response | Outperforms MOVs and polymer-based protectors; captures ESD events before IC input structures are damaged. |
| Level 1 moisture sensitivity | Zero bake requirement prior to reflow; supports standard SMT assembly without floor-life constraints. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for consumer, industrial, and automotive supply chains. |
Applications
| Automotive Lighting Control | Industrial I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontroller GPIOs from load-dump surges and relay coil flyback in headlamp modules. IC Role / Device Role / Timing Role: Primary transient shunt placed across 12 V supply rail and ground, clamping pulses within 53.5 V to preserve 3.3 V logic integrity. Use Value: Prevents latch-up or gate oxide rupture in MCU I/O pins during ISO 7637-2 Pulse 2b (100 V/100 ms), extending field reliability beyond 10-year vehicle life. |
Use Scenario: Safeguarding PLC analog input channels (0–10 V, 4–20 mA) from EFT bursts and lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Bidirectional TVS mounted at connector entry point, limiting common-mode transients before signal conditioning op-amps. Use Value: Maintains <1 µA leakage at 10 V input range, avoiding measurement drift; clamps 1 kV/50 Ω EFT bursts to <55 V, preserving ADC accuracy. |
| USB 2.0 Port Hardening | DC Power Rail Protection |
Use Scenario: ESD protection for USB D+ and D− lines in embedded host controllers, meeting IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS placed directly at USB connector, with symmetrical clamping on both data lines. Use Value: Junction capacitance <100 pF at 0 V (per Fig.5) preserves signal integrity up to 480 Mbps; sub-1 ps response prevents bit errors during ESD events. |
Use Scenario: Overvoltage suppression on 24 V DC power inputs to industrial HMIs, guarding against accidental 48 V misconnection or capacitor discharge spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converter input, absorbing 600 W surges without fuse activation. Use Value: Withstands 11.7 A peak current at 53.5 V clamp, limiting energy delivered to downstream regulators and preventing brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA (Taiwan Semiconductor) | Same VWM (30 V), tighter VBR range (33.3–36.8 V vs. 33.3–40.7 V); lower VC@IPP (48.4 V vs. 53.5 V) at same IPP. | Better clamping performance for sensitive 3.3 V logic; preferred where margin below 50 V is mandatory. | Select SMBJ30CA when lower clamping voltage is prioritized over cost; identical DO-214AA footprint and soldering profile. |
| SMAJ30C (ON Semiconductor) | Same VWM (30 V), but lower PPK (400 W vs. 600 W); higher VC@IPP (64.3 V vs. 53.5 V) at 7.5 A IPP. | Insufficient for ISO 7637-2 Pulse 1 (high-energy load dump); limited to lower-energy ESD-only use cases. | Use SMAJ30C only in non-automotive, low-surge environments; verify layout derating due to higher thermal resistance (RθJA = 85 °C/W). |
Compared with SMBJ30C, SMBJ30CA offers superior clamping with identical form factor and qualification, while SMAJ30C trades off surge capacity and clamping performance for legacy design continuity - making SMBJ30C the optimal balance of 600 W capability, 53.5 V clamping, and broad automotive/industrial compliance.
Availability
SMBJ30C is available at Aetrix Electronics and suitable for automotive lighting control, industrial I/O protection, and USB 2.0 port hardening requiring stable component supply across multi-year production cycles.
Supply support for SMBJ30C 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 since 1979.
The SMBJ series was developed for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low leakage, and robust SMT manufacturability in DO-214AA packages.
FAQ
What is the clamping voltage of SMBJ30C at its rated peak pulse current?
The SMBJ30C has a maximum clamping voltage (VC@IPP) of 53.5 V at 11.7 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain below critical overvoltage thresholds during standardized surge events. The SMBJ30C maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ30C unidirectional or bidirectional, and how is polarity identified?
SMBJ30C is a bi-directional TVS diode - it clamps symmetrically for both positive and negative transients, with no anode/cathode orientation requirement. Unlike unidirectional SMBJ30A (marked "MK"), SMBJ30C uses "MH" marking and lacks a cathode band. Its bidirectional behavior is confirmed by identical VBR min/max (33.3–40.7 V) and VC specs in both polarities per TSC datasheet Rev R2104.
Does SMBJ30C meet automotive surge immunity standards?
Yes, SMBJ30C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (supply line transients), and Pulse 3a/3b (switching noise). Its 600 W peak pulse power rating, 53.5 V clamping, and 11.7 A IPP capability are validated for these waveforms. TSC explicitly lists ISO 7637-2 compliance in the FEATURES section of the SMBJ series datasheet.
What is the maximum leakage current of SMBJ30C at its working voltage?
The SMBJ30C exhibits a maximum blocking leakage current (ID@VWM) of 1 µA at its 30 V working stand-off voltage and 25 °C ambient temperature. This ultra-low leakage is maintained across its full operating temperature range and ensures minimal power drain in always-on systems such as automotive body controllers or IoT sensor nodes using SMBJ30C.
Can SMBJ30C be used in place of SMBJ30A in a circuit?
No - SMBJ30C and SMBJ30A are functionally distinct: SMBJ30C is bi-directional, while SMBJ30A is unidirectional with a cathode band and forward voltage drop (~3.5 V). Substituting SMBJ30C for SMBJ30A in a DC-biased rail may cause unintended conduction. Always verify circuit topology: SMBJ30C suits AC-coupled or floating lines (e.g., RS-485), whereas SMBJ30A is for unidirectional DC rails.
SMBJ30C 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 11.7A
- 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)
SMBJ30C FAQ
1.How can I place an order for SMBJ30C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30C 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 SMBJ30C reliable?
The price and inventory of SMBJ30C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30C is usually 5 days.
3.What payment methods are accepted for SMBJ30C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30C?
SMBJ30C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30C 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 SMBJ30C?
For technical support, including SMBJ30C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30C requirements.
6.How does Aetrix verify that SMBJ30C is sourced from the original manufacturer or authorized distributors?
All SMBJ30C 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 SMBJ30C meets industry standards.
7.What is the process for return or replacement of SMBJ30C?
All SMBJ30C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30C, 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 SMBJ30C part is unused and in its original packaging.
Return procedure for SMBJ30C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30C Tags
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