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Taiwan Semiconductor Corporation SMBJ7.5CH
- Part No.:
- SMBJ7.5CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.5CH.pdf
- Description:
- 600W, 9.3V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,579
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Product details
Overview
SMBJ7.5CH from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 7.5V working stand-off voltage (VWM), 8.33–10.3V breakdown voltage (VBR) at 1mA test current, and clamps transients to ≤14.3V at 100A peak impulse current (IPP), making it suitable for protecting CAN bus interfaces and microcontroller I/O lines in 12V automotive subsystems.
For engineers reviewing the SMBJ7.5CH datasheet, SMBJ7.5CH pinout, SMBJ7.5CH application, or SMBJ7.5CH equivalent, key selection criteria include its AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1μA leakage above 10V, and bidirectional capability enabled by the "CH" suffix - critical for robustness in noisy vehicle power networks.
Technical Context
The SMBJ7.5CH is a single-die, glass-passivated junction TVS diode optimized for fast clamping of high-energy transients. Its unidirectional configuration with cathode band marking enables precise polarity-aware placement in DC-biased signal paths, while its thermal resistance (RθJC = 10°C/W) supports reliable operation up to 150°C junction temperature under repetitive surge conditions.
It meets stringent automotive immunity standards including ISO 7637-2 Pulse 1 (inductive load dump suppression), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump), and Pulse 3a/3b (capacitive coupling transients), with clamping performance validated using standardized 10/1000μs waveform testing per ANSI/IEEE C62.35.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; ensures compatibility with 5V–12V logic and sensor supply rails. |
| VBR min/max | 8.33 V / 10.3 V @ 1 mA - Confirmed breakdown range defines minimum trigger margin and worst-case conduction onset in overvoltage events. |
| VC @ IPP | 14.3 V @ 100 A - Peak clamped voltage during 10/1000μs surge; limits stress on downstream ICs such as CAN transceivers or MCU GPIOs. |
| PPK | 600 W - Non-repetitive peak pulse power rating; determines survivability against single high-energy transients like load dump. |
| ID @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss and avoids false triggering in low-power systems. |
| Response time | <1.0 ps - Sub-picosecond junction response enables effective suppression of ESD and fast-rising electrical fast transients (EFT). |
| TJ max | +150 °C - Maximum junction temperature rating; supports under-hood deployment and sustained operation in thermally constrained PCB layouts. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, polarity indicated by cathode band (unidirectional operation). Weight: 0.090 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms current path during reverse-biased clamping event. |
| Cathode | High-side protected node | Connected to line being protected (e.g., CAN_H, LIN bus, sensor output); blocks normal operation but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use across temperature, humidity, and mechanical shock profiles per JEDEC standard. |
| ISO 7637-2 compliant | Guaranteed performance against all five defined automotive transient pulses (Pulse 1, 2a, 2b, 3a, 3b) without failure or parameter shift. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives, critical for under-hood longevity. |
| Bidirectional capability (CH suffix) | Enables symmetric clamping in AC-coupled or floating signal lines (e.g., differential buses) without external series components. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without special handling. |
Applications
| Automotive CAN Bus Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L lines in body control modules against battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between transceiver pins and connector interface to shunt surge energy to chassis ground. Use Value: Limits clamped voltage to 14.3V, well below the 16V absolute maximum rating of common CAN transceivers (e.g., TJA1042), preventing latch-up or permanent damage. |
Use Scenario: Safeguarding analog outputs of pressure or temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Standoff protector on 4–20mA loop or 0–10V output line, absorbing EFT bursts induced by nearby motor switching. Use Value: Sub-1ps response ensures clamping occurs before sensitive op-amp input stages experience overvoltage, preserving measurement integrity. |
| LED Lighting Driver Input Protection | USB-C Power Delivery Line Protection |
|
Use Scenario: Shielding constant-current LED driver IC inputs from inductive kickback when driving solenoid-based dimming circuits. IC Role / Device Role / Timing Role: Placed across input capacitor terminals to absorb 600W surges generated by relay coil de-energization. Use Value: 600W PPK rating handles worst-case 10/1000μs transients without degradation, maintaining >100,000 surge cycles per MIL-STD-883H Method 3015.8. |
Use Scenario: Guarding USB-C CC and VBUS lines in automotive infotainment head units against hot-plug ESD and cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element (enabled by CH suffix) placed inline with CC logic lines to protect USB PD controller GPIOs. Use Value: 14.3V clamping voltage stays below 15V VIH threshold of common USB PD policy engines, ensuring logic-level integrity during transient events. |
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 SMAJ7.5A | Same DO-214AC (SMA) package; 7.5V VWM, 12.6V VC@100A; lower PPK (400W); no AEC-Q101 certification. | Not qualified for automotive under-hood use; limited to industrial or consumer-grade surge zones. | Select only if cost sensitivity outweighs automotive qualification and higher clamping voltage is acceptable. |
| ON Semiconductor 1.5SMC7.5A | DO-214AB (SMC) package; 7.5V VWM, 12.9V VC@100A; 1500W PPK; AEC-Q101 qualified; larger footprint (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm). | Requires PCB layout change; better suited for high-energy industrial surge environments where space permits. | Choose when system-level surge threat exceeds 600W and board area allows larger SMC package. |
Compared with SMBJ7.5CH, SMAJ7.5A offers lower cost but lacks automotive qualification and clamps at higher voltage, while 1.5SMC7.5A delivers superior energy handling in a larger footprint - making SMBJ7.5CH the optimal balance of AEC-Q101 compliance, compact SMB form factor, and 14.3V clamping for space-constrained automotive nodes.
Availability
SMBJ7.5CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ7.5CH 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 for automotive, industrial, and computing markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing fast response, low clamping, and robust thermal performance in compact surface-mount packages.
FAQ
What does the "CH" suffix indicate in SMBJ7.5CH?
The "CH" suffix denotes a bidirectional variant of the SMBJ7.5H series, enabling symmetrical clamping in both polarities without requiring external circuitry. Unlike unidirectional versions (e.g., SMBJ7.5H), SMBJ7.5CH supports AC-coupled or floating signal lines such as differential buses. This functionality is confirmed in the datasheet's "Devices for Bipolar Applications" section and applies specifically to SMBJ7.5CH, not inferred from other family members.
Is SMBJ7.5CH qualified for automotive applications?
Yes, SMBJ7.5CH is explicitly AEC-Q101 qualified per the provided datasheet (Version A2102, Page 1). It has undergone stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life per the AEC-Q101 standard, making it suitable for under-hood and cabin electronics in passenger vehicles and commercial trucks.
What is the maximum clamping voltage of SMBJ7.5CH at rated surge current?
The maximum clamping voltage (VC) of SMBJ7.5CH is 14.3 V at 100 A peak impulse current (IPP), measured using the standardized 10/1000μs waveform. This value is specified in the Electrical Specifications table on Page 2 of the datasheet and represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
Does SMBJ7.5CH meet ISO 7637-2 immunity requirements?
Yes, SMBJ7.5CH meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as stated in the FEATURES section (Page 1). These pulses simulate real-world automotive transients including load dump, battery disconnection, and capacitive coupling noise - confirming SMBJ7.5CH's suitability for CAN, LIN, and sensor interface protection in certified automotive designs.
What is the thermal resistance from junction to case for SMBJ7.5CH?
The junction-to-case thermal resistance (RθJC) of SMBJ7.5CH is 10°C/W, as published in the THERMAL PERFORMANCE table (Page 2). This value enables accurate thermal modeling of power dissipation during transient events and confirms compatibility with standard PCB copper pour layouts used in automotive control units.
SMBJ7.5CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ7.5CH FAQ
1.How can I place an order for SMBJ7.5CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ7.5CH 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 SMBJ7.5CH reliable?
The price and inventory of SMBJ7.5CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ7.5CH is usually 5 days.
3.What payment methods are accepted for SMBJ7.5CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ7.5CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ7.5CH?
SMBJ7.5CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ7.5CH 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 SMBJ7.5CH?
For technical support, including SMBJ7.5CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ7.5CH requirements.
6.How does Aetrix verify that SMBJ7.5CH is sourced from the original manufacturer or authorized distributors?
All SMBJ7.5CH 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 SMBJ7.5CH meets industry standards.
7.What is the process for return or replacement of SMBJ7.5CH?
All SMBJ7.5CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ7.5CH, 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 SMBJ7.5CH part is unused and in its original packaging.
Return procedure for SMBJ7.5CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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