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Taiwan Semiconductor Corporation SMBJ30A
- Part No.:
- SMBJ30A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:17,746
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Product details
Overview
SMBJ30A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal paths. It features a 30 V working stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR), 48.4 V maximum clamping voltage (VC) at 13.0 A peak pulse current, and 600 W peak pulse power rating with DO-214AA (SMB) package.
For engineers reviewing the SMBJ30A datasheet, SMBJ30A pinout, SMBJ30A application, or SMBJ30A equivalent, key selection criteria include clamping performance under 10/1000 µs transients, leakage current ≤1 µA at 30 V, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and thermal derating above 25°C ambient.
Technical Context
The SMBJ30A operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to clamp transient energy into ground. Its glass-passivated junction ensures stable VBR and low leakage, while fast response time (<1.0 ps) enables protection of sensitive IC inputs against ESD and load-dump events.
Thermal design relies on junction-to-ambient thermal resistance of 55 °C/W and junction-to-case of 10 °C/W, supporting continuous operation up to 150 °C junction temperature. The device is rated for 100 A non-repetitive forward surge (IFSM) but is intended for transient suppression-not steady-state conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 33.3 V / 36.8 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPP | 48.4 V at 13.0 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream circuitry |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs transient, derated above 25°C |
| ID @ VWM | ≤1 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss |
| TJ max | +150 °C - Maximum allowable junction temperature; sets PCB copper area and airflow requirements |
| Package | DO-214AA (SMB) - Standard surface-mount outline with cathode band marking and 0.090 g mass |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band, compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to protected line (e.g., +12 V rail); conducts during forward surge only |
| Cathode | Reverse-biased clamping terminal | Connected to ground or low-impedance return path; conducts avalanche current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Clamping voltage ≤48.4 V at 13 A | Protects 3.3 V/5 V/12 V logic and analog circuits without exceeding safe overvoltage margins |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive-level load dump and inductive switching immunity in 12 V systems |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking; supports automated placement without moisture-related defects |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients before they reach LDOs or microcontrollers. Use Value: Limits peak voltage to 48.4 V during 13 A surges, preventing latch-up or gate oxide damage in downstream ICs. | Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMBJ30A used on supply rail to absorb EFT bursts (IEC 61000-4-4) coupled onto wiring. Use Value: Sub-1 µA leakage preserves loop accuracy; 600 W rating handles repetitive fast transients without degradation. |
| LED Driver Input Protection | USB-C Power Delivery Line Protection |
Use Scenario: Constant-current LED drivers powered from 24 V industrial supplies subject to inductive switching noise. IC Role / Device Role / Timing Role: TVS mounted across input capacitor to shunt voltage spikes generated by relay or solenoid switching nearby. Use Value: 30 V VWM allows normal operation; 48.4 V VC ensures driver ICs (e.g., LM3409) remain below absolute maximum ratings. | Use Scenario: USB-C PD controller power rails (VCONN or VBUS monitoring paths) requiring robust ESD immunity per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Unidirectional clamping element on 3.3 V bias rail feeding PD communication ICs (e.g., FUSB302). Use Value: <1.0 ps response captures ESD events before propagation; RoHS/halogen-free compliance meets end-equipment environmental mandates. |
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 | Bidirectional variant; symmetric breakdown in both polarities; VBR = 33.3–36.8 V in either direction | Required where AC-coupled signals or reversible polarity lines need protection (e.g., RS-485, CAN bus) | Select SMBJ30CA only if bidirectional clamping is needed; SMBJ30A is optimal for DC power rail protection. |
| SAC30 | Same VWM (30 V), but lower PPK (400 W); higher VC (53.5 V at 10 A); different package (DO-214AC/SMA) | Lower surge margin; less suitable for ISO 7637-2 Pulse 5a; acceptable for consumer-grade ESD-only use | Choose SAC30 only for cost-sensitive, non-automotive designs where 600 W headroom is unnecessary. |
Compared with SMBJ30CA and SAC30, the SMBJ30A delivers superior unidirectional surge handling (600 W), tighter clamping (48.4 V), and automotive-grade ISO 7637-2 validation-making it the preferred choice for 12 V/24 V DC power line protection where polarity is fixed and energy levels are high.
Availability
SMBJ30A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver inputs, and USB-C power delivery line protection requiring stable component supply and full traceability.
Supply support for SMBJ30A 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, rectifiers, and MOSFETs for industrial and automotive markets.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing low clamping voltage, ISO 7637-2 compliance, and robust packaging for automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ30A under a 10/1000 µs surge?
The SMBJ30A has a maximum clamping voltage (VC) of 48.4 V when subjected to a 13.0 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMBJ30A maintains this clamping performance across its specified operating temperature range.
Is SMBJ30A suitable for protecting automotive 12 V power rails?
Yes, SMBJ30A is explicitly validated for automotive applications per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b. Its 30 V working voltage aligns with nominal 12 V system tolerances, and its 600 W peak power rating handles load dump transients. The SMBJ30A's DO-214AA package and moisture sensitivity level 1 further support automotive-grade manufacturing and reliability requirements.
Does SMBJ30A have bidirectional capability?
No, SMBJ30A is a unidirectional TVS diode, designed to clamp only reverse-polarity transients. It features a cathode band marking and conducts avalanche current from cathode to anode during overvoltage. For bidirectional protection, the SMBJ30CA variant must be used-its symmetric breakdown allows clamping in both polarities, which is required for AC signals or reversible DC buses.
What is the leakage current specification for SMBJ30A at its working voltage?
The SMBJ30A exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 30 V working stand-off voltage (VWM) and tested at 25°C. This low leakage ensures minimal power loss in always-on systems and preserves accuracy in precision analog or low-power sensor circuits where standby current budget is critical.
How does SMBJ30A compare to SMBJ30 in terms of breakdown voltage and clamping performance?
The SMBJ30A has a tighter breakdown voltage range (33.3–36.8 V) versus SMBJ30 (33.3–40.7 V), resulting in more consistent turn-on behavior. Its clamping voltage is also lower: 48.4 V vs. 53.5 V at respective peak currents (13.0 A vs. 11.7 A). This makes SMBJ30A preferable for designs demanding precise overvoltage thresholds and reduced stress on protected ICs.
SMBJ30A 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:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ30A FAQ
1.How can I place an order for SMBJ30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30A 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 SMBJ30A reliable?
The price and inventory of SMBJ30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30A is usually 5 days.
3.What payment methods are accepted for SMBJ30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30A?
SMBJ30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30A 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 SMBJ30A?
For technical support, including SMBJ30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30A requirements.
6.How does Aetrix verify that SMBJ30A is sourced from the original manufacturer or authorized distributors?
All SMBJ30A 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 SMBJ30A meets industry standards.
7.What is the process for return or replacement of SMBJ30A?
All SMBJ30A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30A, 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 SMBJ30A part is unused and in its original packaging.
Return procedure for SMBJ30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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