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PC451
Sharp Microelectronics
OPTOISOLATOR 3.75KV TRANS 4SMD
7977 Pcs New Original In Stock
Optoisolator Transistor Output 3750Vrms 1 Channel 4-SMD
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5.0 / 5.0
- (273 Ratings)
PC451
Product Overview
7929626
DiGi Electronics Part Number
PC451-DGManufacturer
Sharp Microelectronics
PC451
Description
OPTOISOLATOR 3.75KV TRANS 4SMDInventory
7977 Pcs New Original In Stock
Optoisolator Transistor Output 3750Vrms 1 Channel 4-SMD
Quantity
Minimum 1
Minimum 1
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PC451 Technical Specifications
Category
Optoisolators, Transistor, Photovoltaic Output Optoisolators
Packaging
-
Series
-
Product Status
Obsolete
Number of Channels
1
Voltage - Isolation
3750Vrms
Current Transfer Ratio (Min)
40% @ 5mA
Current Transfer Ratio (Max)
-
Turn On / Turn Off Time (Typ)
-
Rise / Fall Time (Typ)
4µs, 5µs
Input Type
DC
Output Type
Transistor
Voltage - Output (Max)
350V
Current - Output / Channel
50mA
Voltage - Forward (Vf) (Typ)
1.2V
Current - DC Forward (If) (Max)
50 mA
Vce Saturation (Max)
300mV
Operating Temperature
-25°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
4-SMD, Gull Wing
Supplier Device Package
4-SMD
Datasheet & Documents
Datasheets
Download PC451 Product Specification (PDF)
HTML Datasheet
PC451-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.49.8000
Additional Information
Other Names
425-1525-2
425-1525-1
Standard Package
3,000
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
끊임없이 발전하는 서비스 덕분에 고객으로서 매우 만족하고 있습니다.
December 02, 2025
Die Qualität der Artikel ist erstklassig, und das Team bei DiGi Electronics ist äußerst kompetent und freundlich.
December 02, 2025
Their dedication to sustainable practices sets them apart in the industry.
December 02, 2025
Affordable and supported by great after-sales service, Di Digi Electronics is my go-to brand.
December 02, 2025
This purchase impressed me with its durable construction and sturdy packaging.
December 02, 2025
Their after-sales team was patient and thorough when I needed technical assistance.
December 02, 2025
Safe packaging and speedy delivery make shopping here a pleasure.
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Frequently Asked Questions (FAQ)
Can I use the PC451 optoisolator as a drop-in replacement for the HCPL-181-00CE in a 24V industrial control circuit, and what are the key reliability risks I should evaluate?
While the PC451 and HCPL-181-00CE both offer 3.75kVrms isolation and similar package footprints (4-SMD), the PC451 is obsolete and RoHS non-compliant, which introduces long-term supply chain and regulatory risks. Additionally, the PC451 has a lower minimum current transfer ratio (40% @ 5mA) compared to the HCPL-181-00CE (typically 50–600%), meaning it may require higher input current to achieve reliable output switching—especially under temperature drift or aging. In a 24V control loop with marginal drive capability, this could lead to intermittent failures. We recommend validating CTR stability over the full operating temperature range (-25°C to 100°C) and considering active pull-down on the output to mitigate leakage-induced false triggering. For new designs, prefer the active HCPL-181-00CE or a modern RoHS-compliant alternative like the FODM2701R2.
What are the critical layout and creepage considerations when designing a PCB with the PC451 in a high-voltage mains monitoring application, given its 3.75kVrms isolation rating?
Although the PC451 is rated for 3.75kVrms isolation, achieving this in practice depends heavily on PCB layout. The 4-SMD gull-wing package provides limited internal creepage, so you must maintain at least 8mm of clearance between primary (input) and secondary (output) traces on the PCB surface—especially since the device is surface-mount and lacks conformal coating by default. Avoid routing high-voltage traces under the component body, and use slotting or isolation barriers in the PCB if space is constrained. Also, note that moisture sensitivity level (MSL) 1 means no baking is required, but in humid environments, surface contamination can degrade effective isolation over time. Always perform hipot testing (e.g., 3.75kV AC for 60s) on production units to verify real-world isolation integrity.
How does the output saturation voltage (Vce(sat)) of the PC451 compare to the FODM121R2V when driving a relay coil, and could this impact system power efficiency or heat dissipation?
The PC451 has a maximum Vce(sat) of 300mV at 50mA, while the FODM121R2V specifies a lower typical Vce(sat) of 0.4V max but at a reduced 30mA output current. When driving a 50mA relay coil, the PC451 will dissipate up to 15mW (0.3V × 50mA), whereas the FODM121R2V isn’t rated for that load and would overheat. However, if your relay draws only 20–30mA, the FODM121R2V may offer slightly better efficiency. The key trade-off is current capability vs. saturation loss: the PC451 supports higher output current but with marginally higher voltage drop. For low-duty-cycle relays, this difference is negligible, but in continuously energized safety relays, even 15mW can contribute to thermal buildup in dense layouts—consider adding a small heatsink pad or switching to a Darlington-output optoisolator like the LTV-358T if thermal margins are tight.
Is it safe to operate the PC451 near its maximum forward current (50mA) in a 24/7 industrial environment, given its obsolete status and lack of recent reliability data?
Operating the PC451 at its maximum forward current (If = 50mA) continuously significantly reduces its operational lifespan due to LED degradation, especially since the device is obsolete and lacks recent qualification data from Sharp. At 50mA and elevated temperatures (e.g., >85°C), the LED’s quantum efficiency drops, causing CTR to decay over time—potentially falling below the 40% minimum and leading to output failure. For 24/7 applications, derate the forward current to ≤30mA and ensure adequate thermal management (e.g., copper pour under the package). Monitor input current over time if possible, or implement periodic self-test routines. Given the obsolescence, we strongly recommend migrating to a supported part like the FODM2701R2, which includes improved LED materials and full reliability reporting for industrial use.
Can the PC451 be used to isolate a 24V digital signal from a PLC output, and what precautions are needed to avoid false triggering due to leakage current or slow switching?
Yes, the PC451 can isolate a 24V PLC signal, but its transistor output has inherent leakage (typically a few µA) that may cause false triggering in high-impedance input circuits. Additionally, its rise/fall times (4µs/5µs) are slower than logic-family optoisolators, which can cause glitches in fast-switching applications. To mitigate this, add a pull-down resistor (e.g., 10kΩ) on the output side to ensure a solid low state, and verify that the receiving circuit’s input threshold is compatible with the PC451’s output swing (0.3V to ~350V). Also, ensure the PLC’s sourcing capability can drive the PC451’s LED at sufficient current (recommend ≥10mA for margin). Because the PC451 is obsolete and lacks modern noise immunity features, consider using a logic-output optoisolator like the FODM121R2V for cleaner digital interfacing in noisy industrial environments.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
PC451 CAD Models
Sharp Microelectronics PC451 PCB symbols & footprints
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