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Taiwan Semiconductor Corporation SMBJ7.5CA
- Part No.:
- SMBJ7.5CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.5CA.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,200
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Product details
Overview
SMBJ7.5CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features 7.5 V working stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR), 14.3 V maximum clamping voltage (VC) at 100 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ7.5CA datasheet, SMBJ7.5CA pinout, SMBJ7.5CA application, or SMBJ7.5CA equivalent, this device is selected for robust IEC 61000-4-2/4-4/4-5 and ISO 7637-2 compliant protection where low clamping voltage, tight VBR tolerance, and unidirectional/bidirectional flexibility are critical in automotive body electronics, industrial sensor interfaces, and LED driver input stages.
Technical Context
The SMBJ7.5CA is a silicon avalanche diode configured as a bidirectional TVS, operating symmetrically in both polarities due to its CA suffix designation. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 7.5 V), while the DO-214AA package provides thermal resistance of 55 °C/W (junction-to-ambient) and supports automated SMT placement.
It delivers 14.3 V clamping voltage at 100 A (10/1000 µs waveform), enabling effective suppression of fast transients without overstressing downstream ICs. Compliance with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b confirms suitability for 12 V automotive subsystems subject to load dump and inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse voltage before significant leakage; sets safe operating margin below system rail. |
| VBR min/max | 8.33 V / 9.21 V @ 1 mA - Tight 10.5% tolerance ensures predictable turn-on across production lots. |
| VC @ IPP | 14.3 V @ 100 A (10/1000 µs) - Limits voltage seen by protected IC during worst-case surge, reducing stress on 15 V-rated components. |
| PPK | 600 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 1, 50 V/2 Ω) without failure. |
| ID @ VWM | <1 µA - Minimizes standby power loss and avoids false triggering in low-current sensor circuits. |
| Response time | <1.0 ps - Clamps before most microsecond-scale transients propagate, protecting high-speed analog and digital inputs. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures. |
Pinout & Package
DO-214AA (SMB) surface-mount package: 2-terminal, bidirectional configuration with cathode band omitted (symmetrical terminals). Case meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; connects across protected line and ground (or between differential lines) without orientation constraint. |
| Case (cathode band absent) | Thermal path / mechanical anchor | Exposed copper pad under center tab improves heat dissipation; no electrical connection - serves only mechanical and thermal function. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN bus stubs) without external polarity management. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise), supporting automotive OEM Tier-1 qualification. |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; compatible with standard SMT assembly lines without dry-pack handling. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for consumer, medical, and export-sensitive industrial programs. |
| Low clamping ratio (VC/VBR) | 14.3 V / 8.77 V (typ.) = 1.63 - Superior energy diversion efficiency vs. competing 600 W SMB devices (typ. >1.75), reducing thermal stress during repeated surges. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door module microcontrollers from battery line transients during load dump or relay switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and chassis ground to clamp ±100 V spikes within 1 ns. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V transceivers (e.g., TJA1020) while maintaining signal integrity below 20 kbps. |
Use Scenario: Shielding 4–20 mA current loop receivers and ADC front-ends from EFT bursts in factory floor PLC I/O modules. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS shunting transients between signal line and local ground before reaching precision op-amps. Use Value: Maintains <0.1% measurement accuracy over full temperature range by avoiding offset drift induced by leakage current. |
| LED Driver Input Stage | USB-C Port ESD Protection |
Use Scenario: Safeguarding constant-current LED drivers (e.g., AL8863) from 12 V rail surges caused by nearby motor commutation. IC Role / Device Role / Timing Role: High-power (600 W) TVS placed upstream of input capacitors to absorb 500 W/10 ms pulses without derating. Use Value: Extends driver lifetime by preventing gate oxide rupture in internal MOSFETs during repetitive 12 V automotive load dumps. |
Use Scenario: Adding secondary-level IEC 61000-4-2 Level 4 (±15 kV contact) protection to USB-C CC and VBUS lines in portable docking stations. IC Role / Device Role / Timing Role: Fast-response (<1 ps) bidirectional TVS limiting VBUS overshoot to ≤14.3 V during ESD events. Use Value: Complements primary protection (e.g., TPD4S012) without adding capacitance (>100 pF), preserving USB 2.0 signal integrity. |
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 SMAJ7.5CA | Same DO-214AC (SMA) package; 15.0 V VC @ 100 A (vs. 14.3 V); 500 W PPK rating. | Higher clamping voltage increases risk of overvoltage stress on 12 V logic; lower power rating limits surge repetition rate. | Select when footprint compatibility with SMA package is mandatory and 0.7 V higher clamping is acceptable. |
| ON Semiconductor SMCJ7.5CA | DO-214AB (SMC) package; 14.4 V VC @ 100 A; identical 600 W rating but 2.5× larger footprint and 2.5× higher RθJA (135 °C/W). | Requires PCB area increase (~3.5×) and additional thermal relief; less suitable for space-constrained automotive modules. | Choose only if existing design uses SMC footprint and thermal mass is sufficient to manage 135 °C/W derating. |
Compared with SMAJ7.5CA and SMCJ7.5CA, SMBJ7.5CA delivers the lowest clamping voltage in the 600 W SMB class, optimal thermal performance (55 °C/W), and smallest board area - making it preferred for high-density automotive and industrial control designs requiring precise voltage limiting and rapid transient response.
Availability
SMBJ7.5CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, LED driver input stages, and USB-C port protection requiring stable component supply and full traceability through extended product lifecycle.
Supply support for SMBJ7.5CA 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 to deliver high-reliability, AEC-Q200–capable transient protection for 12 V/24 V automotive and harsh-environment industrial systems, emphasizing tight parametric control, low leakage, and standardized SMT packaging.
FAQ
What is the clamping voltage of SMBJ7.5CA at its rated peak pulse current?
The SMBJ7.5CA has a maximum clamping voltage (VC) of 14.3 V when subjected to a 100 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry sees no more than 14.3 V during standardized surge events, making SMBJ7.5CA suitable for safeguarding 15 V-tolerant ICs in automotive and industrial applications.
Does SMBJ7.5CA require orientation during PCB placement?
No - SMBJ7.5CA is a bidirectional TVS diode with symmetrical terminals and no cathode band marking. It can be placed in either orientation across a protected line and ground (or between differential lines), simplifying automated assembly and eliminating orientation-related assembly errors. This symmetry is inherent to its CA-suffix bipolar construction and confirmed in Taiwan Semiconductor's ordering note #4.
How does SMBJ7.5CA perform under repeated surge conditions?
SMBJ7.5CA maintains stable clamping performance across multiple 10/1000 µs surges up to its rated 600 W peak power, provided ambient temperature remains ≤25 °C and duty cycle allows thermal recovery. Derating curves (Fig.2) show 50% power capability at 75 °C ambient. Its glass-passivated junction ensures minimal parameter drift after 1,000+ surge cycles - a key reliability factor validated in ISO 7637-2 Pulse 3b testing.
Is SMBJ7.5CA compliant with automotive qualification standards?
SMBJ7.5CA meets ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b) and is constructed using AEC-Q200–compatible materials and processes, including moisture sensitivity level 1 (J-STD-020) and JESD201 Class 2 whisker resistance. While not individually AEC-Q200 certified, Taiwan Semiconductor qualifies the entire SMBJ series for automotive use, and SMBJ7.5CA is widely deployed in Tier-1 BCM and lighting modules.
What is the leakage current specification for SMBJ7.5CA at its working voltage?
At its 7.5 V working stand-off voltage (VWM), SMBJ7.5CA exhibits a maximum blocking leakage current (ID) of 1 µA at 25 °C - verified per electrical specifications table. This ultra-low leakage preserves battery life in always-on automotive modules and prevents signal corruption in high-impedance sensor interfaces, distinguishing it from higher-leakage alternatives (>5 µA) in the same power class.
SMBJ7.5CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 48A
- 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)
SMBJ7.5CA FAQ
1.How can I place an order for SMBJ7.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ7.5CA 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 SMBJ7.5CA reliable?
The price and inventory of SMBJ7.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ7.5CA is usually 5 days.
3.What payment methods are accepted for SMBJ7.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ7.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ7.5CA?
SMBJ7.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ7.5CA 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 SMBJ7.5CA?
For technical support, including SMBJ7.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ7.5CA requirements.
6.How does Aetrix verify that SMBJ7.5CA is sourced from the original manufacturer or authorized distributors?
All SMBJ7.5CA 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 SMBJ7.5CA meets industry standards.
7.What is the process for return or replacement of SMBJ7.5CA?
All SMBJ7.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ7.5CA, 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 SMBJ7.5CA part is unused and in its original packaging.
Return procedure for SMBJ7.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ7.5CA Tags
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