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Semtech Corporation SMBJ75CA
- Part No.:
- SMBJ75CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75CA.pdf
- Description:
- 1-LINE 75V 4.9A TVS DO-214AA(SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,991
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Product details
Overview
SMBJ75CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power lines and signal interfaces. It features a 75V working peak reverse voltage (VRWM), 123V minimum breakdown voltage (VBR), and clamps transients to ≤123V at 43.3A (8/20μs), with 600W peak pulse power rating per IEC 61000-4-5. It is commonly deployed in industrial power supplies, automotive body electronics, and PoE-powered equipment requiring reliable surge immunity.
For engineers reviewing the SMBJ75CA datasheet, pinout, applications, or equivalent options, key selection criteria include its bidirectional clamping behavior, DO-214AA (SMC) package thermal performance, 100nA max reverse leakage at VRWM, -65°C to +150°C operating range, and compatibility with automated SMT assembly on high-reliability PCBs.
Technical Context
The SMBJ75CA operates as a silicon avalanche diode with symmetrical p-n junction structure, enabling equal clamping response for positive and negative transients. Its breakdown mechanism is governed by controlled avalanche multiplication, delivering stable VBR tolerance (±5%) and low dynamic impedance (<0.5Ω) during surge conduction.
Unlike active protection devices such as TDS suppressors, SMBJ75CA relies solely on passive junction physics-no trigger circuit, no FET, no drive logic. This results in sub-nanosecond response time but fixed clamping rise with increasing IPP; its VC increases linearly from 123V at 10A to 139V at 43.3A (8/20μs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 75 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR (min) | 123 V @ ITR = 1 mA - Ensures reliable avalanche initiation above system operating voltage margin. |
| VC @ IPP = 43.3A | 139 V (8/20μs) - Clamping voltage seen by protected circuit during worst-case surge event. |
| PPPK | 600 W - Peak transient energy absorption capability under standardized surge waveform. |
| IR @ VRWM | 100 nA max - Negligible leakage current preserves efficiency in low-power standby modes. |
| Operating Temp | -65°C to +150°C - Supports under-hood automotive, industrial control, and outdoor telecom deployments. |
Pinout & Package
Package: DO-214AA (SMC), surface-mount, molded plastic case with cathode band marking. Dimensions: 7.11 mm × 6.22 mm × 2.34 mm. Thermal resistance RθJA ≈ 40°C/W on 1-in² copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode-banded end) | Transient return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping. |
| Cathode (banded end) | Protected line interface | Connected to line being protected (e.g., 48V rail, CAN_H); avalanche conduction begins here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without polarity concerns. |
| DO-214AA package | Provides 2.34 mm profile and 600W surge rating in industry-standard footprint compatible with legacy SMB/SMA designs. |
| Low clamping ratio (VC/VBR) | 1.13 - Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices. |
| AEC-Q200 qualified option | Available as SMBJ75CAQ - Meets stress test requirements for automotive electronic modules. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V/48V DC input stage of PLC I/O module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Passive shunt clamp placed upstream of DC-DC converter input to limit bus voltage excursion during ISO 7637-2 Pulse 5a events. Use Value: Limits peak voltage to ≤139V, preventing damage to 100V-rated input MOSFETs and reducing need for oversized input capacitors. |
Use Scenario: LIN bus or switched 12V supply line in door module subjected to ESD and battery reversal. IC Role / Device Role / Timing Role: Bidirectional TVS across power rail to absorb ±15kV contact ESD (IEC 61000-4-2) and clamp reverse battery transients. Use Value: Maintains <100nA leakage at 12V, avoiding parasitic drain on vehicle battery during extended parking. |
| Power over Ethernet (PoE) PSE Interface | Telecom Central Office DC Feeder |
Use Scenario: 44–57V DC power feed from PoE switch to powered device, subject to lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Primary surge clamp on DC input before hot-swap controller and DC-DC regulation stages. Use Value: Withstands 600W 8/20μs surges while maintaining VC below 140V, protecting IEEE 802.3af/at-compliant front-end ICs. |
Use Scenario: -48V DC distribution within telecom rack, exposed to induced surges from nearby AC mains or lightning. IC Role / Device Role / Timing Role: Bidirectional clamp across -48V rail and return to protect rectifier diodes and monitoring circuits. Use Value: Operates reliably at +85°C ambient with <1% VBR drift, ensuring consistent protection in sealed, fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | Unidirectional version; conducts only for positive transients relative to cathode. | Requires explicit polarity assignment; unsuitable for AC or floating lines. | Select SMBJ75A only when protecting unidirectional DC rails with known polarity and ground reference. |
| SMCJ75CA | Same VRWM/VBR specs but in larger DO-214AB (SMC) package; rated for 1500W peak power. | Higher thermal mass supports repeated surge duty cycles; occupies more board area. | Choose SMCJ75CA where sustained surge repetition or higher IPP margin (>43.3A) is required. |
Compared with SMBJ75A, SMBJ75CA provides polarity-agnostic protection essential for bidirectional buses; compared with SMCJ75CA, it trades peak power headroom for compactness-ideal for space-constrained PoE injectors and automotive ECUs where 600W suffices.
Availability
SMBJ75CA is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, Power over Ethernet (PoE) interfaces, and telecom DC feeder systems requiring stable component supply across long production lifecycles.
Supply support for SMBJ75CA 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 manufacturer of circuit protection, power control, and sensing technologies, founded in 1927 and headquartered in Chicago, Illinois.
The SMBJ series belongs to Littelfuse's discrete TVS diode portfolio, engineered specifically for high-reliability surge suppression in harsh environments including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What is the maximum clamping voltage of SMBJ75CA at its rated peak pulse current?
The SMBJ75CA clamps to a maximum of 139 V when subjected to its rated 43.3 A peak pulse current (8/20 μs waveform). This value is guaranteed per the Littelfuse datasheet and reflects worst-case conduction across temperature and process variation. The SMBJ75CA maintains this clamping performance without external bias or control circuitry, making it suitable for immediate deployment in high-speed surge scenarios.
Is SMBJ75CA suitable for automotive applications?
Yes - the SMBJ75CA is offered in an AEC-Q200-qualified variant (SMBJ75CAQ) that meets stress testing requirements for automotive electronic modules. Its -65°C to +150°C operating range, robust DO-214AA package, and stable VBR tolerance support use in body control units, lighting drivers, and infotainment power inputs. The SMBJ75CA itself is not Q200-certified, but the Q-grade variant ensures compliance for automotive-grade designs.
How does SMBJ75CA differ from the TDS2211P referenced in the provided datasheet?
The SMBJ75CA is a passive silicon avalanche TVS diode, whereas the TDS2211P is an active transient diverting suppressor using a triggered FET architecture. SMBJ75CA has no internal control circuitry, responds in <1 ns, and exhibits linear VC rise with IPP; TDS2211P uses a precision trigger to activate a low-RDS(on) FET, achieving near-constant clamping (~28 V) across its 40 A range. The SMBJ75CA serves general-purpose surge suppression; TDS2211P targets precision low-clamp applications like USB Type-C PD bus protection.
Can SMBJ75CA be used in bidirectional signal line protection?
Yes - SMBJ75CA is explicitly a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive- and negative-going transients. This makes it appropriate for protecting AC-coupled data lines (e.g., RS-485, CAN), floating DC sensors, or any interface where voltage polarity relative to ground is undefined or reversible. Its DO-214AA package allows straightforward placement across differential pairs or power/return paths without polarity orientation concerns.
What is the reverse leakage current specification for SMBJ75CA at its working voltage?
The SMBJ75CA specifies a maximum reverse leakage current (IR) of 100 nA at its rated working peak reverse voltage (VRWM) of 75 V and ambient temperature of 25°C. This ultra-low leakage ensures minimal impact on system power budget and signal integrity in high-impedance circuits. At elevated temperatures (e.g., +125°C), leakage may increase to ~1 µA, remaining well within acceptable limits for most industrial and automotive applications using SMBJ75CA.
SMBJ75CA 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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)
SMBJ75CA FAQ
1.How can I place an order for SMBJ75CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75CA 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 SMBJ75CA reliable?
The price and inventory of SMBJ75CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75CA is usually 5 days.
3.What payment methods are accepted for SMBJ75CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75CA?
SMBJ75CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75CA 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 SMBJ75CA?
For technical support, including SMBJ75CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75CA requirements.
6.How does Aetrix verify that SMBJ75CA is sourced from the original manufacturer or authorized distributors?
All SMBJ75CA 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 SMBJ75CA meets industry standards.
7.What is the process for return or replacement of SMBJ75CA?
All SMBJ75CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75CA, 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 SMBJ75CA part is unused and in its original packaging.
Return procedure for SMBJ75CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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