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Taiwan Semiconductor Corporation SMBJ7.5
- Part No.:
- SMBJ7.5
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.5.pdf
- Description:
- 600W, 9.3V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,074
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Product details
Overview
SMBJ7.5 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection with 600W peak pulse power rating, 7.5V working stand-off voltage, and 14.3V maximum clamping voltage at 100A peak impulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ7.5 datasheet, SMBJ7.5 pinout, SMBJ7.5 application, or SMBJ7.5 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current at operating voltage, thermal resistance (RθJA = 55°C/W), and compliance with automotive EFT immunity standards.
Technical Context
The SMBJ7.5 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 8.33–10.3V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR and low leakage (<1μA at 7.5V), enabling reliable protection of 5V–12V logic and power rails without loading during normal operation.
With a sub-1ps response time and 10/1000μs waveform capability, it diverts fast transients before downstream components experience overvoltage. Its DO-214AA package supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's nominal rail voltage. |
| VBR @ IT=1mA | 8.33–10.3 V - Breakdown voltage range confirming reliable turn-on above VWM with sufficient margin for tolerance and temperature drift. |
| VC @ IPP=100A | 14.3 V - Clamping voltage under full-rated 10/1000μs surge; defines worst-case overvoltage seen by downstream ICs. |
| IPP max | 100 A - Peak impulse current capacity at rated waveform; determines survivability against high-energy transients like load dump. |
| PPK | 600 W - Non-repetitive peak pulse power; defines energy-handling capability per IEC 61000-4-5 and ISO 7637-2 compliance. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs derating requirements in enclosed or high-ambient environments. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Polarity is unidirectional, with cathode terminal designated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference node | Connected to system ground or low-side return path; forms current path during reverse-biased clamping event. |
| Cathode | Protected line input | Connected to line being protected (e.g., 5V supply rail); reverse voltage applied here triggers avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage across temperature (-55°C to +150°C) and lifetime, critical for automotive-grade reliability. |
| Fast response time <1 ps | Enables clamping before transient edge propagates into sensitive IC inputs, meeting stringent EFT immunity requirements (IEC 61000-4-4). |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive battery-line surge immunity including load dump (Pulse 5a/b not supported), supporting AEC-Q101 pre-compliance screening. |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow, simplifying SMT assembly and reducing manufacturing cost and risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 5V/12V microcontroller power supplies in body control modules exposed to ISO 7637-2 Pulse 2b (battery disconnect) and Pulse 3b (capacitive discharge). IC Role / Device Role / Timing Role: Unidirectional TVS placed between VDD and GND, clamping transients within 1ps to limit overvoltage to ≤14.3V. Use Value: Prevents latch-up or permanent damage to MCU IO and internal regulators during vehicle-level EMC testing. | Use Scenario: Safeguarding analog front-end inputs of 4–20mA current-loop sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting induced surges before reaching precision op-amps and ADCs. Use Value: Maintains signal integrity and measurement accuracy by limiting transient-induced offset shifts and preventing input stage saturation. |
| LED Driver Output Protection | USB Port ESD Suppression |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when driving solenoids or relays on shared PCBs. IC Role / Device Role / Timing Role: Placed across driver output and ground to clamp flyback spikes exceeding 7.5V standoff. Use Value: Extends LED driver IC lifetime by preventing repeated overvoltage stress during switching transitions. | Use Scenario: Adding secondary-level ESD protection on USB VBUS line upstream of integrated USB switch or PMIC. IC Role / Device Role / Timing Role: Unidirectional TVS absorbing ±15kV contact ESD (IEC 61000-4-2) while maintaining <1μA leakage at 5V. Use Value: Complements internal ESD structures without degrading insertion loss or signal rise/fall times on high-speed D+/D− lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.5A (Taiwan Semiconductor) | Narrower VBR range (8.33–9.21V vs. 8.33–10.3V); lower clamping voltage (12.9V vs. 14.3V at 100A). | Better suited for tighter voltage-margin designs where clamping headroom must be minimized below 13V. | Select SMBJ7.5A when protecting 3.3V logic with 5V rail or when lower VC is prioritized over broader VBR tolerance. |
| SMAJ7.5 (ON Semiconductor) | Same DO-214AC (SMA) package; lower PPK (400W vs. 600W); higher VC (15.0V vs. 14.3V at 60A). | Limited to lower-energy transients; not rated for full ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance. | Choose SMAJ7.5 only for cost-sensitive consumer applications with less severe surge requirements and no automotive qualification needs. |
Compared with SMBJ7.5A, the SMBJ7.5 offers wider VBR tolerance and higher clamping voltage-beneficial in noisy environments where precise VBR control is less critical than robustness. Versus SMAJ7.5, SMBJ7.5 delivers 50% higher surge power handling and verified ISO 7637-2 compliance, making it suitable for automotive and industrial deployments.
Availability
SMBJ7.5 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver circuits, and USB power rail protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ7.5 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 with global AEC-Q101 and industrial qualification capabilities.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust clamping performance, low leakage, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of SMBJ7.5 at its rated peak pulse current?
The SMBJ7.5 has a maximum clamping voltage (VC) of 14.3 V when subjected to a 10/1000 μs surge waveform at 100 A peak impulse current (IPP). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMBJ7.5 maintains this clamping performance across its specified operating temperature range of –55°C to +150°C.
Is SMBJ7.5 suitable for bidirectional transient protection?
No, SMBJ7.5 is a unidirectional TVS diode and is not rated for bidirectional operation. For bipolar protection, select the SMBJ7.5C or SMBJ7.5CA variant, which features symmetrical breakdown characteristics in both polarities. The SMBJ7.5's cathode band marking and electrical specifications-including forward voltage and single-directional leakage-are defined exclusively for reverse-biased clamping applications.
What is the working stand-off voltage (VWM) of SMBJ7.5, and how does it relate to circuit design?
The SMBJ7.5 has a working stand-off voltage (VWM) of 7.5 V, meaning it remains non-conductive up to this DC or RMS voltage level. Designers must ensure the protected line's nominal voltage (e.g., 5V or 7V rail) stays below 7.5 V with margin for ripple and tolerance. Exceeding VWM risks premature conduction and increased leakage, compromising efficiency and reliability. The SMBJ7.5's VWM is validated per JESD201 and J-STD-020 standards.
Does SMBJ7.5 meet automotive EMC standards such as ISO 7637-2?
Yes, SMBJ7.5 is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms, covering common conducted transient threats in 12V automotive systems-including battery disconnection, alternator load dump coupling, and capacitive discharge events. Its 600W peak pulse power rating and sub-1ps response time enable compliance without external filtering. Note that Pulse 5a/5b (load dump) requires higher-voltage variants (e.g., SMBJ33 and above).
What is the thermal resistance profile of SMBJ7.5, and how does it affect PCB layout?
The SMBJ7.5 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤ 150°C under repetitive surges, PCB layout must include adequate copper area (≥ 40 mm² per pad) and thermal vias beneath the DO-214AA footprint. Insufficient copper or enclosure airflow increases effective RθJA, risking thermal runaway during sustained transient activity. The SMBJ7.5's RθJA is measured on standard JEDEC 2S2P test board.
SMBJ7.5 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 14.3V
- Current - Peak Pulse (10/1000µs):
- 44A
- 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)
SMBJ7.5 FAQ
1.How can I place an order for SMBJ7.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ7.5 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 SMBJ7.5 reliable?
The price and inventory of SMBJ7.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ7.5 is usually 5 days.
3.What payment methods are accepted for SMBJ7.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ7.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ7.5?
SMBJ7.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ7.5 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 SMBJ7.5?
For technical support, including SMBJ7.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ7.5 requirements.
6.How does Aetrix verify that SMBJ7.5 is sourced from the original manufacturer or authorized distributors?
All SMBJ7.5 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 SMBJ7.5 meets industry standards.
7.What is the process for return or replacement of SMBJ7.5?
All SMBJ7.5 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ7.5, 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 SMBJ7.5 part is unused and in its original packaging.
Return procedure for SMBJ7.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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