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Taiwan Semiconductor Corporation SMBJ75CAH
- Part No.:
- SMBJ75CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75CAH.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,408
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Product details
Overview
SMBJ75CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. It features a 75V working stand-off voltage (VWM), 121V maximum clamping voltage (VC) at 5.2A peak impulse current, and 600W peak pulse power rating with sub-1ps response time. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive switching immunity.
For engineers reviewing the SMBJ75CAH datasheet, SMBJ75CAH pinout, SMBJ75CAH application, or SMBJ75CAH equivalent, key selection criteria include bidirectional clamping behavior, 75V VWM compatibility with 12V/24V systems, UL 94V-0 molded package, and compliance with automotive transients per ISO 7637-2 - critical for infotainment, body control, and ADAS power rail protection.
Technical Context
The SMBJ75CAH operates as a bipolar junction TVS diode with symmetrical breakdown in both directions, enabling single-device protection of AC-coupled or floating signal paths. Its glass-passivated junction ensures stable leakage (<1µA at 75V) and robust ESD immunity up to ±30kV (HBM), while the DO-214AA (SMB) package supports automated placement and meets JESD201 Class 2 whisker resistance.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, allowing reliable operation up to TJ = +150°C. The device sustains non-repetitive 10/1000µs surges up to 5.2A without degradation and maintains clamping within 121V under full-rated stress - essential for protecting downstream CAN, LIN, or sensor interface ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous DC or RMS voltage the device blocks without conduction; matches 12V/24V automotive supply rails. |
| VBR (min/max) | 83.3 / 92.1 V - Breakdown occurs within this range at 1mA test current; ensures predictable turn-on before system damage. |
| VC @ IPP | 121 V at 5.2 A - Clamping voltage during 10/1000µs surge; limits downstream voltage stress to safe levels for 3.3V/5V ICs. |
| PPK | 600 W - Peak pulse power handling per 10/1000µs waveform; sufficient for ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery dump). |
| ID @ VWM | <1 µA - Ultra-low leakage at rated stand-off voltage; prevents battery drain in always-on automotive modules. |
| Response time | <1.0 ps - Near-instantaneous avalanche turn-on; protects sensitive analog and digital inputs from fast EFT bursts. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional, cathode band not applicable (bidirectional symmetry). Matte tin-plated leads, RoHS and halogen-free compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; interchangeable terminals enable flexible PCB layout on AC or floating nodes. |
| Case (cathode band absent) | Thermal and mechanical interface | DO-214AA body provides 10°C/W junction-to-case thermal path; solderable per J-STD-002 for reflow reliability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin environments including temperature cycling, humidity, and mechanical shock. |
| ISO 7637-2 compliance | Withstands Pulse 1 (−150V/0.5Ω), Pulse 2a (+100V), Pulse 2b (−100V), Pulse 3a/b (±50V fast transients) without failure. |
| Glass passivated junction | Ensures stable VBR over lifetime and high reliability in humid or contaminated environments (e.g., engine control units). |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in safety-critical automotive assemblies. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs from load-dump spikes and ESD events during vehicle assembly or service. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between LIN line and ground, absorbing transients before they reach the transceiver's ESD diodes. Use Value: Enables single-device protection without polarity concerns; clamps to ≤121V, preserving LIN physical layer integrity under ISO 7637-2 Pulse 2b (−100V). | Use Scenario: Safeguarding 24V DC digital input channels in programmable logic controllers exposed to field-wiring transients and relay coil kickback. IC Role / Device Role / Timing Role: Standoff protector across input terminal and common rail, conducting only during >83.3V surges to limit voltage seen by optocoupler or MCU GPIO. Use Value: 75V VWM aligns precisely with 24V nominal + 200% tolerance; 600W PPK handles repetitive 10/1000µs surges from inductive loads without derating. |
| Automotive Infotainment Power Rail | Smart Lighting Driver Protection |
Use Scenario: Shielding USB-C PD controller and display power supplies from battery-line transients during cold-cranking or jump-start conditions. IC Role / Device Role / Timing Role: Parallel-connected TVS on 5V/12V rails, clamping surges before they propagate into buck converter feedback networks or USB PHYs. Use Value: Sub-1ps response ensures clamping initiates before internal IC ESD structures fail; 121V VC prevents latch-up in 5V logic domains. | Use Scenario: Protecting LED driver ICs and MOSFET gate drivers in automotive headlamps from alternator ripple and load-dump-induced overvoltage. IC Role / Device Role / Timing Role: Bidirectional shunt device across driver output and ground, suppressing both positive and negative transients generated by PWM switching and inductive ballast. Use Value: Symmetrical VBR (83.3–92.1V) and VC (121V) ensure balanced protection during reverse-polarity fault conditions in dual-battery architectures. |
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 SMAJ75CA | Same DO-214AC (SMA) package; 125V VC @ 5.0A; slightly higher clamping voltage and lower IPP (5.0A vs. 5.2A). | Lower power density due to SMA package (RθJA ≈ 65°C/W vs. SMB's 55°C/W); less suitable for high-ambient under-hood use. | Select when footprint constraints favor SMA or when legacy designs already use SMA layout. |
| ON Semiconductor 1.5SMC75CA | DO-214AB (SMC) package; 125V VC @ 5.0A; same VWM/VBR but larger thermal mass (RθJA ≈ 40°C/W). | Higher mounting height and PCB area; better for high-reliability industrial power supplies where space permits. | Select when higher thermal margin is needed and board space allows SMC footprint. |
Compared with SMBJ75CAH, SMAJ75CA offers identical electrical specs but reduced thermal performance in a smaller package, while 1.5SMC75CA delivers superior heat dissipation in a larger footprint - choice depends on ambient temperature, layout space, and automotive qualification requirements.
Availability
SMBJ75CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and smart lighting applications requiring stable component supply, AEC-Q101 compliance, and ISO 7637-2 transient immunity.
Supply support for SMBJ75CAH 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 automotive-qualified components.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing low clamping, fast response, and robust packaging for under-hood and body electronics.
FAQ
What does the 'CAH' suffix indicate in SMBJ75CAH?
The 'CAH' suffix in SMBJ75CAH denotes a bidirectional configuration with AEC-Q101 qualification and high-reliability construction. 'C' indicates bidirectional operation, 'A' specifies tighter VBR tolerance (±5% vs. ±10% for 'H'), and 'H' confirms the high-temp, automotive-grade process. This distinguishes it from unidirectional SMBJ75H or standard SMBJ75AH variants.
Is SMBJ75CAH suitable for protecting CAN FD interfaces?
Yes, SMBJ75CAH is suitable for CAN FD interface protection when placed on the CAN_H/CAN_L lines with appropriate series impedance. Its 121V clamping voltage and sub-1ps response prevent bus disruption during ESD or EFT events, and its bidirectional symmetry avoids signal distortion - provided layout minimizes parasitic inductance and the device is paired with common-mode chokes per ISO 11898-2.
How does SMBJ75CAH differ from SMBJ75AH?
SMBJ75CAH differs from SMBJ75AH in three confirmed ways: (1) bidirectional vs. unidirectional operation, (2) tighter VBR tolerance (83.3–92.1V vs. 83.3–102V), and (3) explicit AEC-Q101 qualification per the datasheet revision A2102. SMBJ75AH is unidirectional and lacks the 'C' designation, making it unsuitable for AC-coupled or floating node protection where polarity reversal may occur.
What is the maximum operating temperature for SMBJ75CAH?
The maximum junction temperature for SMBJ75CAH is +150°C, with storage temperature rated from −55°C to +150°C. At TA = 25°C, its RθJA is 55°C/W, meaning power dissipation must be limited to maintain TJ ≤ 150°C - e.g., at 85°C ambient, max allowable steady-state power is ~1.18W (65°C rise ÷ 55°C/W), though surge ratings apply only to non-repetitive events.
Does SMBJ75CAH require a heatsink for standard automotive use?
No, SMBJ75CAH does not require an external heatsink for standard automotive use because it handles transients non-repetitively and its steady-state power dissipation (PD = 3W) is managed via the DO-214AA package's inherent thermal path. In typical 12V/24V rail protection, average power remains near zero; heatsinking is unnecessary unless subjected to frequent, high-duty-cycle surges exceeding datasheet derating curves.
SMBJ75CAH 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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)
SMBJ75CAH FAQ
1.How can I place an order for SMBJ75CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75CAH 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 SMBJ75CAH reliable?
The price and inventory of SMBJ75CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75CAH is usually 5 days.
3.What payment methods are accepted for SMBJ75CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75CAH?
SMBJ75CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75CAH 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 SMBJ75CAH?
For technical support, including SMBJ75CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75CAH requirements.
6.How does Aetrix verify that SMBJ75CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ75CAH 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 SMBJ75CAH meets industry standards.
7.What is the process for return or replacement of SMBJ75CAH?
All SMBJ75CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75CAH, 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 SMBJ75CAH part is unused and in its original packaging.
Return procedure for SMBJ75CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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