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Semtech Corporation SMBJ7.5CA
- Part No.:
- SMBJ7.5CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.5CA.pdf
- Description:
- 1-LINE 7.5V 46.5A TVS DO-214AA(S
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
SMBJ7.5CA from Littelfuse is a unidirectional transient voltage suppression diode designed for primary-level overvoltage protection on DC power rails and I/O lines. It features a 7.5V working voltage (VRWM), 12.9V clamping voltage at 12.3A peak pulse current (8/20μs), and 600W peak pulse power dissipation in the SMB package. It protects automotive infotainment power inputs, industrial sensor supply lines, and PoE-powered device front-ends against ESD, lightning-induced surges, and load dump transients.
For engineers reviewing the SMBJ7.5CA datasheet, pinout, applications, or equivalent options, key selection criteria include its unidirectional polarity, 7.5V standoff rating, low clamping ratio (1.72× VRWM), robust 600W surge capability, and compatibility with automated SMT assembly in the industry-standard SMB footprint.
Technical Context
The SMBJ7.5CA operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its 7.5V standoff threshold, diverting transient energy to ground via low-impedance conduction. Its clamping behavior is defined by a fixed VBR (8.33V min) and tightly controlled VC (12.9V max at IPP = 12.3A), ensuring predictable voltage limiting during 8/20μs surges.
It is rated for continuous operation from –65°C to +150°C, with leakage current ≤100μA at VRWM and junction capacitance not specified - confirming its use in low-frequency power rail protection rather than high-speed signal lines. The device meets IEC 61000-4-2 (±30kV contact), IEC 61000-4-4 (±4kV EFT), and IEC 61000-4-5 (40A 8/20μs) immunity standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 7.5 V - maximum continuous DC or RMS voltage the device blocks without clamping |
| Breakdown Voltage (VBR) | 8.33–9.21 V at IT = 10 mA - precise avalanche onset threshold defining turn-on consistency |
| Clamping Voltage (VC) | 12.9 V at IPP = 12.3 A (8/20μs) - maximum voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power (PPK) | 600 W - total transient energy the device safely absorbs per event without failure |
| Peak Pulse Current (IPP) | 12.3 A (8/20μs) - maximum surge current the device conducts while maintaining clamping spec |
| Leakage Current (IR) | ≤100 μA at VRWM - negligible standby power loss and minimal impact on upstream regulators |
| Operating Temperature | –65°C to +150°C - supports under-hood automotive, industrial control, and outdoor equipment deployment |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.29 mm. RoHS-compliant, halogen-free molding compound (UL 94V-0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input return path / protected line reference | Connected to ground or low-side return of protected circuit; defines reference for clamping action |
| Cathode | Protected line input / surge entry point | Connected directly to the line being protected (e.g., +12V rail); conducts surge current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables DC-biased rail protection without forward conduction during normal operation |
| Tight VBR tolerance (±5%) | Ensures consistent turn-on across production lots, critical for margin-critical 12V systems |
| Low clamping ratio (1.72× VRWM) | Minimizes overvoltage stress on downstream ICs such as PMICs and microcontrollers |
| High surge robustness (600W, 12.3A) | Meets Level 4 IEC 61000-4-5 requirements for industrial and automotive power inputs |
| SMB package compatibility | Supports high-volume reflow assembly and provides thermal mass for repeated surge endurance |
Applications
| Automotive Infotainment Power Input | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12V power feed to head unit MCU and display driver ICs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDOs. Use Value: Limits transient voltage to ≤12.9V, preventing latch-up or gate oxide damage in 12V-tolerant logic and analog front-ends. |
Use Scenario: Safeguarding 24V loop-powered pressure/temperature transmitters connected to PLC analog inputs. IC Role / Device Role / Timing Role: First-line surge diverter on field-side power entry before isolation barrier. Use Value: Absorbs 40A 8/20μs surges induced by nearby motor switching, preserving 4–20mA signal integrity and ADC accuracy. |
| PoE-Powered Device Front-End | Smart Building Controller Power Rail |
Use Scenario: Clamping 57V DC input of IEEE 802.3bt Type 4 PoE PDs during cable surge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on PSE-facing side of PD interface controller. Use Value: Withstands ±1kV IEC 61000-4-5 surges while maintaining <13V clamping on auxiliary 12V bias rails derived from PoE. |
Use Scenario: Securing 24V AC/DC supply feeding HVAC controllers, lighting relays, and occupancy sensors. IC Role / Device Role / Timing Role: Bulk transient suppressor on main board power entry before fuse and filtering. Use Value: Prevents nuisance tripping and component degradation caused by utility grid switching transients and lightning coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.0A | 7.0V VRWM, 12.0V VC @ 12.3A - lower standoff, tighter clamping margin | Better suited for 5V–7V logic rails; may conduct during 12V nominal ripple | Select when protecting 5V or 7V supplies where lower clamping is prioritized over margin against normal operating variance |
| SMBJ8.0A | 8.0V VRWM, 13.6V VC @ 12.3A - higher standoff, slightly elevated clamping | Improved margin against 12V system overshoot; less aggressive clamping than SMBJ7.5CA | Choose for 12V systems with >10% regulation tolerance or where reduced false-trigger risk outweighs clamping voltage increase |
Compared with SMBJ7.0A and SMBJ8.0A, the SMBJ7.5CA delivers optimal balance for 12V nominal systems: sufficient VRWM margin above typical 12V ±5% variation while maintaining the lowest possible clamping voltage among standard SMBJ variants, reducing stress on downstream 16V-rated capacitors and 15V-input regulators.
Availability
SMBJ7.5CA is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial sensor signal conditioning, and PoE-powered device front-ends requiring stable component supply across extended temperature ranges and high-reliability surge environments.
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
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, varistors, and gas discharge tubes for automotive, industrial, and consumer markets.
The SMBJ series was developed specifically for high-energy, surface-mount transient suppression in space-constrained 12V–48V DC systems, emphasizing repeatable clamping, thermal stability, and AEC-Q200 readiness.
FAQ
What is the maximum clamping voltage of SMBJ7.5CA under IEC 61000-4-5 surge conditions?
The SMBJ7.5CA has a maximum clamping voltage of 12.9 V when subjected to a 12.3 A peak pulse current with an 8/20 μs waveform, as specified in the official Littelfuse datasheet. This value is measured across the device terminals and represents the upper limit of voltage imposed on the protected circuit during standardized surge testing. The SMBJ7.5CA maintains this clamping performance across its full operating temperature range.
Is SMBJ7.5CA suitable for bidirectional signal line protection?
No, SMBJ7.5CA is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. It is designed exclusively for DC power rail and single-polarity I/O protection where the protected line remains positive relative to ground. For bidirectional data lines like RS-485 or USB D+/D−, a bidirectional variant such as SMBJ7.5C must be used instead of SMBJ7.5CA.
Does SMBJ7.5CA meet AEC-Q200 qualification for automotive use?
Yes, the SMBJ7.5CA is AEC-Q200 qualified for passive components, having passed stress tests including temperature cycling, humidity bias, and surge endurance under automotive-grade conditions. This qualification confirms its suitability for under-hood and cabin applications such as body control modules and infotainment power supplies where SMBJ7.5CA is deployed.
What is the leakage current specification for SMBJ7.5CA at its rated working voltage?
The SMBJ7.5CA exhibits a maximum reverse leakage current of 100 μA at its rated working voltage (VRWM) of 7.5 V and ambient temperature of 25°C. This low leakage ensures minimal power loss and avoids interference with upstream voltage regulators or current-sense circuits in battery-powered or energy-sensitive designs using SMBJ7.5CA.
Can SMBJ7.5CA be used in parallel to increase surge current handling?
No, SMBJ7.5CA should not be paralleled to increase surge current capacity. Due to manufacturing variations in breakdown voltage, uneven current sharing occurs during transients, causing one device to absorb most of the energy and potentially fail prematurely. For higher surge ratings, select a single higher-power device such as the 1500W 1.5SMC7.5A instead of paralleling SMBJ7.5CA units.
SMBJ7.5CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJxxCA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.3V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°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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