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SMF45CA
ANBON SEMICONDUCTOR (INT'L) LIMITED
TVS DIODE 200W 50V-55.3V SOD-12
3131 Pcs New Original In Stock
72.7V Clamp 2.8A Ipp Tvs Diode Surface Mount SOD-123
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5.0 / 5.0
- (327 Ratings)
SMF45CA
Product Overview
2668866
DiGi Electronics Part Number
SMF45CA-DGManufacturer
ANBON SEMICONDUCTOR (INT'L) LIMITED
SMF45CA
Description
TVS DIODE 200W 50V-55.3V SOD-12Inventory
3131 Pcs New Original In Stock
72.7V Clamp 2.8A Ipp Tvs Diode Surface Mount SOD-123
Quantity
Minimum 1
Minimum 1
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SMF45CA Technical Specifications
Category
Transient Voltage Suppressors (TVS), TVS Diodes
Packaging
Tape & Reel (TR)
Series
SMF
Product Status
Active
Type
Zener
Bidirectional Channels
1
Voltage - Reverse Standoff (Typ)
45V
Voltage - Breakdown (Min)
50V
Voltage - Clamping (Max) @ Ipp
72.7V
Current - Peak Pulse (10/1000µs)
2.8A
Power - Peak Pulse
200W
Power Line Protection
No
Applications
General Purpose
Capacitance @ Frequency
-
Operating Temperature
-55°C ~ 150°C (TJ)
Mounting Type
Surface Mount
Package / Case
SOD-123F
Supplier Device Package
SOD-123
Datasheet & Documents
Datasheets
Download SMF45CA Product Specification (PDF)
HTML Datasheet
SMF45CA-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
Additional Information
Other Names
4530-SMF45CATR
4530-SMF45CADKR
4530-SMF45CACT
Standard Package
9,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
他們的售後服務團隊耐心細心，解決問題的速度令人讚賞。
Dec 02, 2025
Their support staff was proactive in reaching out to ensure everything was functioning as expected.
Dec 02, 2025
The support staff is knowledgeable and courteous, providing excellent after-purchase help.
Dec 02, 2025
I appreciate their transparent and efficient logistics monitoring.
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Frequently Asked Questions (FAQ)
When replacing a Littelfuse SMAJ45A TVS diode in a 48V industrial power rail protection circuit, can the SMF45CA from ANBON SEMICONDUCTOR be used as a drop-in alternative without compromising clamping performance or board layout?
The SMF45CA is not a direct electrical or mechanical replacement for the SMAJ45A despite similar voltage ratings. While both are 45V bidirectional TVS diodes, the SMF45CA uses a SOD-123 package (smaller than SMAJ’s DO-214AC/SMA footprint), requiring PCB layout changes. More critically, the SMF45CA has a higher clamping voltage (72.7V @ 2.8A) compared to the SMAJ45A’s 72.7V @ 5.2A—meaning under higher surge currents, the SMF45CA may expose downstream components to greater stress. Only consider substitution if your surge energy is consistently below 2.8A and you can accommodate the smaller package; otherwise, redesign with margin or select a higher-power SMF variant like SMF58CA.
What are the risks of using the SMF45CA in a 24V automotive CAN bus line where load dump transients can exceed 60V for hundreds of milliseconds?
Using the SMF45CA on a 24V automotive CAN bus presents significant reliability risks. Although its 50V breakdown seems sufficient, ISO 7637-2 load dump pulses can reach 87V for 400ms—far beyond the SMF45CA’s 200W peak pulse power rating (which is only valid for 10/1000µs waveforms). The diode will likely fail shorted during sustained overvoltage events, potentially causing bus lockup or fire hazards. Instead, use a dedicated automotive-grade TVS like the SMAJ58A or SM8S48A, which are rated for longer-duration transients and include AEC-Q101 qualification. The SMF45CA is better suited for short-duration ESD or lightning-induced surges on non-critical lines.
Can the SMF45CA be safely paralleled with another SMF45CA to increase surge current handling in a space-constrained 45V DC input protection stage?
Paralleling two SMF45CA diodes is not recommended due to inherent mismatches in breakdown voltage and dynamic impedance, which cause unequal current sharing during fast transients. Even minor parametric variations can lead to one diode absorbing >70% of the surge energy, causing premature failure. Additionally, the SOD-123 package lacks thermal coupling, exacerbating thermal runaway risk. For higher surge capability in tight layouts, select a single higher-power device like the SMDJ45A (600W, DO-214AB) or use a multi-channel TVS array with integrated balancing. If space is extremely limited, consider a polymer-based ESD suppressor rated for your surge profile instead.
How does the SMF45CA’s -55°C to 150°C operating temperature range impact its long-term reliability in outdoor telecom equipment exposed to daily thermal cycling from -30°C to +85°C?
While the SMF45CA’s specified temperature range covers your operating window, repeated thermal cycling between -30°C and +85°C can induce mechanical stress at the solder joints due to CTE mismatch between the SOD-123 package and PCB. Over time, this may lead to latent opens or increased leakage current. ANBON doesn’t publish AEC-Q101 or extended reliability data, so field failure risk is higher than with qualified alternatives like Vishay’s SMA6J45A. Mitigate this by using conformal coating, ensuring proper pad design with thermal relief, and derating the clamping voltage by 10% at cold temperatures. For mission-critical outdoor deployments, prefer components with proven thermal cycle test data (>1,000 cycles).
Is the SMF45CA suitable for protecting a 45V PoE++ (IEEE 802.3bt) PD input against IEC 61000-4-5 surge tests, and what design precautions are needed to avoid false triggering during normal operation?
The SMF45CA alone is insufficient for full IEC 61000-4-5 compliance on PoE++ inputs, which require handling 1.2/50µs–8/20µs combinational waves up to 2kV (≈100A). Its 2.8A peak pulse current rating is far below this threshold, risking catastrophic failure. However, it can serve as a secondary clamp behind a primary GDT or MOV if placed close to the PHY. To avoid nuisance conduction during normal 57V PoE operation, ensure the 50V breakdown leaves adequate margin—but note that leakage current rises sharply near breakdown. Add a series ferrite bead and bulk capacitance upstream to filter high-frequency noise that might trigger the diode. Always validate with actual surge testing; consider upgrading to a 58V-rated TVS like the SMF58CA for additional headroom.
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SMF45CA CAD Models
ANBON SEMICONDUCTOR (INT'L) LIMITED SMF45CA PCB symbols & footprints
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