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Taiwan Semiconductor Corporation SMBJ30
- Part No.:
- SMBJ30
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30.pdf
- Description:
- 600W, 37V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,175
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Product details
Overview
SMBJ30 from Taiwan Semiconductor is a unidirectional 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), 33.3–40.7 V breakdown voltage (VBR @ 1 mA), 53.5 V maximum clamping voltage (VC) at 11.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive body electronics, industrial I/O modules, and LED driver input stages.
For engineers reviewing the SMBJ30 datasheet, SMBJ30 pinout, SMBJ30 application, or SMBJ30 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-214AA (SMB) package thermal limits (RθJA = 55 °C/W), and leakage current ≤1 µA at 30 V.
Technical Context
The SMBJ30 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response (<1.0 ps) to fast transients while maintaining low leakage (<1 µA at VWM). Its unidirectional configuration provides forward conduction path only during reverse overvoltage events, with VF = 3.5 V at 50 A for surge current handling.
Thermally, it supports junction temperatures from –55 °C to +150 °C and delivers 600 W non-repetitive peak impulse power when derated per ambient temperature (Fig.2), with RθJC = 10 °C/W ensuring effective heat transfer to PCB copper in standard SMB footprint layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin below breakdown. |
| VBR min/max | 33.3 V / 40.7 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC @ IPP | 53.5 V @ 11.7 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient stress level. |
| PPK | 600 W - Peak pulse power handling capability; validates compliance with ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; critical for low-power sensor nodes and battery-backed systems where quiescent current matters. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and enclosed industrial enclosures. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; defines required PCB copper area and airflow for sustained 3 W steady-state dissipation. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during reverse surge to clamp voltage. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); avalanche breakdown occurs here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics across temperature and lifetime; eliminates passivation-related drift in clamping voltage. |
| Clamping voltage ≤53.5 V @ 11.7 A | Guarantees downstream ICs (e.g., CAN transceivers, microcontrollers) remain below absolute maximum ratings during 10/1000 µs surges. |
| Response time <1.0 ps | Fast enough to suppress ESD events (IEC 61000-4-2) before sensitive gate oxides experience damage. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for consumer, industrial, and automotive supply chains. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load switch-off), Pulse 2a (supply line interruption), Pulse 2b (battery disconnection), and Pulse 3a/3b (capacitive coupling). |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs of BCM microcontrollers and LIN/CAN transceivers against load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS placed between power rail and ground, triggered by reverse overvoltage exceeding 33.3 V. Use Value: Limits clamped voltage to 53.5 V, keeping downstream 3.3 V/5 V logic ICs within safe operating area during ISO 7637-2 Pulse 1 (–120 V, 50 ms). |
Use Scenario: Safeguarding 24 V digital input terminals of PLC I/O cards against field-wiring induced surges and EFT bursts. IC Role / Device Role: Standoff protector on each optocoupler input channel, absorbing repetitive 1 kV/50 Ω EFT (IEC 61000-4-4) pulses. Use Value: Sub-1 µA leakage preserves input threshold accuracy; 600 W rating handles multiple 10/1000 µs surges without degradation. |
| LED Streetlight Driver Input Stage | Medical Diagnostic Sensor Interface |
Use Scenario: Suppressing switching transients from AC/DC front-end rectifiers and MOSFET flyback spikes in outdoor LED drivers. IC Role / Device Role: Primary surge limiter on bulk DC bus (30–40 V), placed upstream of PWM controller and gate drivers. Use Value: 53.5 V clamping prevents overvoltage failure of 60 V-rated MOSFETs and current-sense amplifiers during 600 W surge events. |
Use Scenario: Shielding low-noise analog front-ends (e.g., EEG/ECG amplifiers) from ESD coupling via patient cables or connectors. IC Role / Device Role: Low-capacitance TVS on differential sensor lines (e.g., ±5 V instrumentation amps), grounded via short trace. Use Value: <1 µA leakage avoids DC offset errors; fast response prevents ESD-induced latch-up in precision op-amps. |
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 SMAJ30A | Same DO-214AC (SMA) package; slightly higher VBR (33.3–36.8 V), identical VC = 53.5 V, but lower PPK = 400 W. | Lower surge energy handling; unsuitable for ISO 7637-2 Pulse 1 where 600 W is required. | Select SMBJ30 when full 600 W compliance is mandatory; SMAJ30A may be used only in lower-energy EFT-only designs. |
| ON Semiconductor SMCJ30A | DO-214AB (SMC) package (larger footprint); same electrical specs (VWM = 30 V, VC = 53.5 V, PPK = 1500 W), higher thermal mass. | Requires PCB layout change; better suited for high-reliability industrial power supplies needing >600 W headroom. | Choose SMBJ30 for space-constrained SMB layouts; SMCJ30A only if board real estate allows larger SMC and higher surge margin is needed. |
Compared with SMAJ30A and SMCJ30A, the SMBJ30 uniquely balances 600 W surge capability, DO-214AA (SMB) compactness, and automotive-grade ISO 7637-2 validation - making it optimal for cost-sensitive, space-limited 24 V systems requiring certified transient immunity.
Availability
SMBJ30 is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor node protection, and LED lighting driver inputs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ30 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 specifically for AEC-Q101-compliant automotive and harsh-environment industrial applications demanding robust, standardized surface-mount surge protection with validated ISO 7637-2 immunity.
FAQ
What is the polarity configuration of SMBJ30?
The SMBJ30 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA (SMB) package. It conducts only when reverse-biased beyond its breakdown voltage (33.3–40.7 V), making it suitable for DC rail protection where polarity is fixed. Unlike bidirectional variants (e.g., SMBJ30C), SMBJ30 does not conduct in forward direction under normal operation.
Does SMBJ30 meet automotive surge immunity standards?
Yes, SMBJ30 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (supply interruption), Pulse 2b (battery disconnection), and Pulse 3a/3b (capacitive coupling), verified per manufacturer test data. Its 600 W peak pulse power and 53.5 V clamping voltage ensure compliance in 12 V and 24 V vehicle subsystems.
What is the maximum leakage current of SMBJ30 at its working voltage?
The SMBJ30 exhibits maximum blocking leakage current (ID) of ≤1 µA at its 30 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage supports battery-powered and low-quiescent-current applications such as remote sensors and always-on monitoring circuits without compromising standby power budget.
Can SMBJ30 be used in bidirectional signal line protection?
No - SMBJ30 is strictly unidirectional and lacks symmetrical breakdown in both polarities. For bidirectional protection (e.g., RS-485, USB, or AC-coupled lines), use SMBJ30C or SMBJ30CA, which feature center-tapped construction and equal VBR in both directions. Using SMBJ30 on bidirectional lines risks forward conduction and failure during positive transients.
What is the thermal resistance and how does it affect PCB layout for SMBJ30?
SMBJ30 has RθJA = 55 °C/W and RθJC = 10 °C/W. To maintain TJ ≤150 °C at full 3 W steady-state dissipation, the PCB must provide ≥1.5 cm² of 2-oz copper connected to both leads. Insufficient copper or poor airflow causes thermal runaway; recommended pad layout follows TSC's DO-214AA footprint with thermal vias under the cathode/anode pads.
SMBJ30 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):
- 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)
SMBJ30 FAQ
1.How can I place an order for SMBJ30 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30 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 SMBJ30 reliable?
The price and inventory of SMBJ30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30 is usually 5 days.
3.What payment methods are accepted for SMBJ30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30?
SMBJ30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30 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 SMBJ30?
For technical support, including SMBJ30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30 requirements.
6.How does Aetrix verify that SMBJ30 is sourced from the original manufacturer or authorized distributors?
All SMBJ30 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 SMBJ30 meets industry standards.
7.What is the process for return or replacement of SMBJ30?
All SMBJ30 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30, 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 SMBJ30 part is unused and in its original packaging.
Return procedure for SMBJ30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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