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Semtech Corporation SMBJ64CA
- Part No.:
- SMBJ64CA
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ64CA.pdf
- Description:
- 1-LINE 64V 5.8A TVS DO-214AA(SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,544
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Product details
Overview
SMBJ64CA from Littelfuse is a bidirectional transient voltage suppression (TVS) diode designed for robust overvoltage protection of DC power lines and I/O interfaces. It features a 64V working voltage (VRWM), 70V minimum breakdown voltage (VBR), and clamps at ≤104V under 100A 8/20μs surge current - delivering reliable protection for industrial power supplies, automotive ECUs, and PoE-powered equipment.
For engineers reviewing the SMBJ64CA datasheet, pinout, applications, or equivalent options, key selection criteria include its unidirectional/bidirectional configuration, JEDEC DO-214AA (SMC) package compatibility, low dynamic impedance (ZDY), and compliance with IEC 61000-4-2 ESD (±30kV contact) and IEC 61000-4-5 surge (40A, 8/20μs) standards.
Technical Context
The SMBJ64CA operates as a clamping-type TVS diode using a planar silicon avalanche junction. Its bidirectional structure enables symmetrical protection against both positive and negative transients on AC-coupled or floating lines. The device achieves stable clamping across -65°C to +150°C via temperature-compensated avalanche breakdown.
It is rated for 600W peak pulse power (tp = 10/1000μs) and exhibits low leakage (<1μA at VRWM) and fast response time (<1.0ps). Unlike active suppressors (e.g., TDS2211P), it requires no trigger circuit or control logic - relying solely on intrinsic junction behavior for passive, zero-latency surge diversion to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 64 V - maximum continuous DC or RMS voltage the device blocks without conduction. |
| Breakdown Voltage (VBR) | 70 V min @ IT = 1 mA - guaranteed avalanche onset threshold for reliable triggering. |
| Clamping Voltage (VC) | 104 V max @ IPP = 100 A, 8/20 μs - peak line voltage seen by protected circuit during worst-case surge. |
| Peak Pulse Power (PPK) | 600 W @ tp = 10/1000 μs - energy-handling capacity sufficient for IEC 61000-4-5 Level 4 surges. |
| Leakage Current (IR) | 1 μA max @ VRWM - negligible standby power loss and signal integrity impact in high-impedance circuits. |
| Package | DO-214AA (SMC) - industry-standard surface-mount outline enabling drop-in replacement and automated assembly. |
Pinout & Package
Package: DO-214AA (SMC), plastic molded, cathode-banded end, RoHS-compliant, 7.11 mm × 6.22 mm × 2.34 mm profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Transient return path | Connected to system ground or low-impedance reference plane to shunt surge current away from protected node. |
| Cathode (banded end) | Protected line interface | Connected directly to the line being safeguarded (e.g., 48V rail, RS-485 bus); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating lines (e.g., Ethernet PHY, audio inputs) without polarity constraints. |
| IEC 61000-4-2 ESD immunity | Withstands ±30 kV contact discharge - eliminates need for additional ESD stages in front-end protection. |
| Low clamping ratio (VC/VBR) | 1.49 max - ensures minimal overvoltage stress on downstream ICs during surge events. |
| High surge current rating | 100 A (8/20 μs) - meets EN 61000-4-5 Level 4 requirements for industrial environments. |
| Wide operating temperature | -65°C to +150°C - supports under-hood automotive, outdoor telecom, and industrial control applications. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24V DC input stage of programmable logic controller (PLC) exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between input connector and DC-DC converter input. Use Value: Limits transient voltage to ≤104V, preventing damage to 75V-rated input capacitors and MOSFET gate drivers. |
Use Scenario: LIN bus line in BCM subjected to battery disconnect spikes and ESD from service port access. IC Role / Device Role / Timing Role: Bidirectional TVS mounted at connector entry point, referenced to chassis ground. Use Value: Clamps ±104V transients within 1 ps, preserving LIN transceiver functionality per ISO 11898-4. |
| POE-PD Interface Protection | RS-485 Data Line Protection |
Use Scenario: Power Sourcing Equipment (PSE) side of IEEE 802.3af/at/bt compliant PoE switch with 57V nominal output. IC Role / Device Role / Timing Role: Secondary surge clamp after primary DC-DC isolation, protecting hot-swap controller and sense resistors. Use Value: Withstands 100A surge while maintaining <104V clamping - avoids false overvoltage shutdown during lightning-induced surges. |
Use Scenario: Termination point of long-haul RS-485 trunk line in factory automation network subject to ground potential differences. IC Role / Device Role / Timing Role: Differential pair protector (two SMBJ64CA devices in back-to-back configuration). Use Value: Provides symmetrical ±104V clamping on A/B lines without distorting differential signaling up to 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | Unidirectional version; same VRWM, VBR, VC, and package - lacks negative-polarity clamping capability. | Restricted to DC-only lines with defined polarity (e.g., +12V supply rail); unsuitable for AC or floating buses. | Select SMBJ64A only when polarity is fixed and board space allows single-device placement. |
| SMCJ64CA | Same electrical specs but in larger DO-214AB (SMC) package (7.78 mm × 6.22 mm); 1500W PPK rating. | Used where higher surge margin is required (e.g., outdoor base stations), but occupies ~25% more PCB area. | Choose SMCJ64CA when system-level testing demands >600W surge headroom or thermal derating is critical. |
Compared with SMBJ64A and SMCJ64CA, the SMBJ64CA uniquely balances bidirectional protection, compact DO-214AA footprint, and 600W surge capability - making it optimal for space-constrained industrial and automotive modules requiring symmetrical transient immunity.
Availability
SMBJ64CA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and PoE-powered devices requiring stable component supply, full traceability, and lifecycle continuity support.
Supply support for SMBJ64CA 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 industrial, automotive, and consumer markets.
The SMBJ64CA belongs to Littelfuse's SMBJ series of high-reliability TVS diodes engineered for ruggedized DC power line and data interface protection in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of SMBJ64CA at 100A surge current?
The SMBJ64CA has a maximum clamping voltage (VC) of 104 V when subjected to a 100 A, 8/20 μs surge waveform. This value is specified in the official Littelfuse datasheet and represents the peak voltage measured across the SMBJ64CA terminals during standardized surge testing - ensuring protected circuits remain below critical overvoltage thresholds.
Is SMBJ64CA suitable for protecting RS-485 differential pairs?
Yes, SMBJ64CA is commonly used in back-to-back configuration across RS-485 A/B lines. Its bidirectional design provides symmetrical ±104 V clamping, and its low capacitance (~150 pF) minimizes signal distortion at data rates up to 10 Mbps. The SMBJ64CA must be placed close to the connector with short, matched traces to maintain common-mode rejection.
How does SMBJ64CA differ from the TDS2211P in terms of protection mechanism?
Unlike the active TDS2211P - which uses a triggered FET shunt with near-constant clamping - the SMBJ64CA is a passive avalanche diode whose clamping voltage rises linearly with surge current (VC ≈ VBR + IPP × ZDY). The SMBJ64CA offers simpler implementation and zero latency but lacks the flat-clamp performance of the TDS2211P across wide current/temperature ranges.
Can SMBJ64CA replace SMBJ64A in an existing design?
No - SMBJ64CA is bidirectional while SMBJ64A is unidirectional. Swapping them without circuit review risks failure during negative transients. If the original design uses SMBJ64A on a DC line with known polarity, replacing it with SMBJ64CA adds unnecessary cost and may alter leakage behavior; verify polarity constraints and layout before substitution.
What is the operating temperature range for SMBJ64CA?
The SMBJ64CA is rated for operation from -65°C to +150°C, supporting deployment in extreme environments including under-hood automotive, industrial motor drives, and outdoor telecom infrastructure. Its leakage current remains below 1 μA at VRWM across this full range, ensuring stable performance without thermal runaway.
SMBJ64CA 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- 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)
SMBJ64CA FAQ
1.How can I place an order for SMBJ64CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ64CA 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 SMBJ64CA reliable?
The price and inventory of SMBJ64CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ64CA is usually 5 days.
3.What payment methods are accepted for SMBJ64CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ64CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ64CA?
SMBJ64CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ64CA 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 SMBJ64CA?
For technical support, including SMBJ64CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ64CA requirements.
6.How does Aetrix verify that SMBJ64CA is sourced from the original manufacturer or authorized distributors?
All SMBJ64CA 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 SMBJ64CA meets industry standards.
7.What is the process for return or replacement of SMBJ64CA?
All SMBJ64CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ64CA, 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 SMBJ64CA part is unused and in its original packaging.
Return procedure for SMBJ64CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ64CA Tags
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