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PC844X1
Sharp Microelectronics
OPTOISOLTR 5KV 4CH TRANS 16-DIP
5630 Pcs New Original In Stock
Optoisolator Transistor Output 5000Vrms 4 Channel 16-DIP
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5.0 / 5.0
- (349 Ratings)
PC844X1
Product Overview
7924872
DiGi Electronics Part Number
PC844X1-DGManufacturer
Sharp Microelectronics
PC844X1
Description
OPTOISOLTR 5KV 4CH TRANS 16-DIPInventory
5630 Pcs New Original In Stock
Optoisolator Transistor Output 5000Vrms 4 Channel 16-DIP
Quantity
Minimum 1
Minimum 1
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PC844X1 Technical Specifications
Category
Optoisolators, Transistor, Photovoltaic Output Optoisolators
Packaging
-
Series
-
Product Status
Obsolete
Number of Channels
4
Voltage - Isolation
5000Vrms
Current Transfer Ratio (Min)
50% @ 1mA
Current Transfer Ratio (Max)
150% @ 1mA
Turn On / Turn Off Time (Typ)
-
Rise / Fall Time (Typ)
4µs, 3µs
Input Type
AC, DC
Output Type
Transistor
Voltage - Output (Max)
80V
Current - Output / Channel
50mA
Voltage - Forward (Vf) (Typ)
1.2V
Current - DC Forward (If) (Max)
50 mA
Vce Saturation (Max)
200mV
Operating Temperature
-30°C ~ 100°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Supplier Device Package
16-DIP
Datasheet & Documents
Datasheets
Download PC844X1 Product Specification (PDF)
HTML Datasheet
PC844X1-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
425-1495-5
Standard Package
25
Alternative Parts
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Leurs délais de livraison sont parmi les meilleurs que j'ai rencontrés, et le support après-vente est très rassurant.
December 02, 2025
The team at DiGi Electronics is dedicated to providing top-tier after-sales support.
December 02, 2025
Affordable prices coupled with top quality make DiGi Electronics stand out.
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Frequently Asked Questions (FAQ)
Can I safely replace the obsolete PC844X1 optoisolator in my existing 4-channel industrial control design with a modern RoHS-compliant alternative without redesigning the PCB footprint?
While the PC844X1 is obsolete and non-RoHS, you can consider drop-in replacements like the LTV-844 or K844P, which share the same 16-DIP through-hole package and pinout. However, verify critical parameters: the LTV-844 has a slightly lower isolation voltage (5000Vrms vs. PC844X1’s 5000Vrms—nominally equal but check certification standards), and its CTR may differ under low If conditions. Perform validation testing under your actual load and temperature conditions to ensure signal integrity, especially if driving logic-level inputs directly. Always update BOM and assembly docs to reflect the new part number and RoHS compliance status.
What are the key reliability risks when using the PC844X1 in high-humidity environments despite its MSL 1 rating, and how can I mitigate them in a field-deployed system?
Although the PC844X1 has an MSL 1 (unlimited floor life) rating, its non-hermetic plastic DIP package is susceptible to moisture ingress over time in high-humidity or condensing environments, potentially leading to increased leakage current or reduced isolation performance. To mitigate risk, apply conformal coating (e.g., acrylic or silicone-based) over the device and surrounding area, ensure proper PCB spacing (>8mm creepage), and avoid deployment in uncontrolled outdoor or washdown environments. Consider upgrading to a hermetically sealed or higher-reliability optocoupler like the ILQ620GB if long-term field reliability is critical.
How does the PC844X1’s current transfer ratio (CTR) degradation over temperature affect signal integrity in a 24V industrial input interface operating near 85°C?
The PC844X1’s CTR is specified at 25°C (50–150% @ 1mA), but CTR typically degrades by 30–50% at 85°C, especially at low forward currents. In a 24V input circuit relying on transistor saturation, this can lead to insufficient output current, causing marginal logic levels or failure to trigger downstream circuitry. Design with margin: use a higher input current (e.g., 5–10mA instead of 1mA) and verify Vce(sat) remains below your logic threshold across the full temperature range. Include a pull-up resistor on the output to ensure clean high-state signaling even with reduced CTR.
Is it safe to parallel channels on the PC844X1 to increase output current beyond 50mA per channel for driving a relay coil, and what are the failure modes if attempted?
Paralleling channels on the PC844X1 is not recommended due to inherent CTR mismatch between channels (up to ±50% variation), which leads to uneven current sharing and potential thermal runaway in one channel. Even if total current stays below 200mA (4 × 50mA), one transistor may carry disproportionate load and exceed its safe operating area. Instead, use a single channel to drive a low-power MOSFET or Darlington buffer rated for the relay current. This preserves isolation integrity and avoids latent reliability issues from unbalanced stress.
When replacing the PC844X1 with the ILQ620GB in a medical device application, what isolation certification and creepage/clearance considerations must I address despite both having 5kVrms ratings?
Although both the PC844X1 and ILQ620GB offer 5000Vrms isolation, the ILQ620GB is certified to IEC 60601-1 (medical safety standard) with reinforced insulation, while the PC844X1 lacks formal medical certification. In medical designs, you must ensure the replacement meets required pollution degree, altitude, and material group criteria. Additionally, verify that your PCB layout maintains ≥8mm creepage and clearance between primary and secondary sides—especially critical in the 16-DIP package where pin spacing is fixed. Update your risk management file (per ISO 14971) to reflect the component change and revalidate dielectric withstand testing.
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.
PC844X1 CAD Models
Sharp Microelectronics PC844X1 PCB symbols & footprints
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