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PC851X
Sharp Microelectronics
OPTOISOLATOR 5KV TRANS 4DIP
3395 Pcs New Original In Stock
Optoisolator Transistor Output 5000Vrms 1 Channel 4-DIP
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Minimum 1
5.0 / 5.0
- (248 Ratings)
PC851X
Product Overview
7917129
DiGi Electronics Part Number
PC851X-DGManufacturer
Sharp Microelectronics
PC851X
Description
OPTOISOLATOR 5KV TRANS 4DIPInventory
3395 Pcs New Original In Stock
Optoisolator Transistor Output 5000Vrms 1 Channel 4-DIP
Quantity
Minimum 1
Minimum 1
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PC851X Technical Specifications
Category
Optoisolators, Transistor, Photovoltaic Output Optoisolators
Packaging
-
Series
-
Product Status
Obsolete
Number of Channels
1
Voltage - Isolation
5000Vrms
Current Transfer Ratio (Min)
-
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
Through Hole
Package / Case
4-DIP (0.300", 7.62mm)
Supplier Device Package
4-DIP
Datasheet & Documents
Datasheets
Download PC851X Product Specification (PDF)
HTML Datasheet
PC851X-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
425-1503-5
Standard Package
50
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
DiGi Electronics legt großen Wert auf saubere und sichere Verpackung, was für ein positives Einkaufserlebnis sorgt.
December 02, 2025
時間厳守の配送で、ビジネス用途でも安心して利用できます。
December 02, 2025
DiGi Electronics consistently provides products that meet high standards.
December 02, 2025
Excellent experience overall, with a focus on transparency and consistent quality.
December 02, 2025
Their quick resolution of after-sales issues demonstrates their professionalism.
December 02, 2025
Consistent product delivery helps me meet tight project deadlines.
December 02, 2025
Shopping here feels great because of their competitive prices and helpful staff.
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Frequently Asked Questions (FAQ)
Can I safely replace the obsolete PC851X optoisolator in my industrial control circuit with a modern RoHS-compliant alternative like the LTV-851 without redesigning the PCB or risking signal integrity issues?
While the LTV-851 is listed as a substitute for the PC851X and shares similar electrical characteristics such as 5kVrms isolation, 350V output voltage, and 4-DIP through-hole package, you must verify critical timing and current transfer ratio (CTR) margins in your specific application. The PC851X has a typical rise/fall time of 4µs/5µs, and even small deviations in CTR or switching speed can affect feedback loop stability in precision analog isolation or high-speed digital interfaces. Perform bench testing under worst-case load and temperature conditions—especially if your design operates near the 50mA output current limit—to ensure the LTV-851 maintains adequate noise margin and propagation delay consistency. Also confirm pin compatibility, as minor lead spacing differences may stress PCB pads during insertion.
What are the key reliability risks when continuing to use the PC851X in new designs despite its obsolete status and non-RoHS compliance?
Using the PC851X in new designs introduces supply chain, regulatory, and long-term reliability risks. As an obsolete component, Sharp Microelectronics no longer guarantees production support, increasing the likelihood of counterfeit or degraded stock—even if labeled 'new original.' Non-RoHS compliance may restrict sales in EU markets or require costly exemptions. Additionally, aging inventory may suffer from increased moisture sensitivity or degraded LED efficiency, leading to lower CTR over time and premature failure in high-reliability applications like medical or industrial safety systems. For new designs, migrating to a supported, RoHS-compliant alternative such as the LTV-851 or Toshiba TLP785 is strongly recommended to ensure lifecycle continuity and compliance.
How does the PC851X’s 5kVrms isolation voltage translate to real-world creepage and clearance requirements on a PCB, and what layout practices should I follow to maintain safety in a 230VAC industrial environment?
The PC851X’s 5kVrms isolation rating assumes proper PCB layout; however, the 4-DIP package with 7.62mm pin spacing provides only ~3.8mm internal creepage, which may be insufficient for reinforced insulation in 230VAC systems per IEC 60664-1. To maintain safety, you must increase external creepage by milling a slot (≥1mm wide) between input and output sides of the package and ensure at least 6mm of clearance in air. Avoid routing high-voltage traces under or near the optoisolator, and use conformal coating if operating in humid environments. Always validate your layout against the applicable safety standard (e.g., IEC 61010 or UL 60950) and consider using an optoisolator with wider pin spacing (e.g., 8-DIP) if space allows, as the PC851X pushes the limits of safe isolation in compact designs.
Can the PC851X reliably switch a 24V industrial relay coil drawing 40mA, and what base resistor value should I use to ensure saturation without overdriving the input LED?
Yes, the PC851X can switch a 24V relay at 40mA since it supports up to 50mA output current and 350V collector-emitter voltage. However, to ensure saturation (Vce < 300mV), calculate the required input current based on worst-case CTR. Assuming a conservative CTR of 50% (common for aged units), you need at least 80mA input current—but the PC851X’s max forward current is 50mA, so you must operate near its limit. Use a base resistor to drive the input LED at 30–40mA (e.g., 1.2V forward drop with 5V drive → R = (5V – 1.2V)/0.035A ≈ 109Ω, use 100Ω). Monitor temperature rise, as CTR degrades at high ambient temperatures. For higher reliability, consider a Darlington-output optoisolator like the LTV-827S or add a transistor buffer stage to reduce stress on the PC851X output.
Is the PC851X suitable for isolating UART signals at 115200 baud, and what circuit modifications are needed to prevent signal distortion due to its 4–5µs rise/fall times?
The PC851X’s typical 4µs rise and 5µs fall times limit its effectiveness at 115200 baud (8.68µs bit time), as the transition times consume nearly 100% of the bit period, risking intersymbol interference and data errors. While it may work in benign environments with strong signal margins, it is not recommended for reliable high-speed UART isolation. If you must use the PC851X, reduce the baud rate to 9600 or 19200, add Schmitt-trigger buffers on the output, and ensure tight impedance control on signal traces. For 115200 baud or higher, replace the PC851X with a high-speed digital isolator such as the Silicon Labs Si8621 or Broadcom ACPL-M71T, which offer sub-10ns propagation delays and integrated signal conditioning. The PC851X is better suited for low-frequency on/off control or status signaling, not high-speed data communication.
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.
PC851X CAD Models
Sharp Microelectronics PC851X PCB symbols & footprints
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