PC817X1CSP9F Guide

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PC817X1CSP9F Application and Usage Guide

The PC817X1CSP9F is a single-channel, surface-mount phototransistor optocoupler intended to transfer low-speed digital or analog state information across a galvanic isolation barrier. Its exact A-rank ordering code specifies a collector-current range of 4–8 mA at IF = 5 mA, VCE = 5 V, and Ta = 25 °C, equivalent to 80–160% CTR under that test condition (Sharp/Socle exact-device specification).

Evidence status: The linked exact-device PDF is public and manufacturer-authored/mirrored, but Flux’s immutable datasheet citation index remained pending after the allowed retry. Values below transcribed from that PDF are therefore labeled source-transcribed; citation-index verification pending, rather than represented as fully tool-verified.

1. Quick Specifications

Absolute maximum ratings are stress limits, not recommended operating points. Design conditions must include CTR tolerance, temperature, aging, drive-voltage tolerance, GPIO output drop, and receiver input thresholds.

Table

Parameter	Absolute maximum rating	Typical / design operating condition	Verification
LED forward current, IF	50 mA	5 mA is the exact A-rank CTR test current and a practical starting point	Source-transcribed; citation-index verification pending (exact PDF)
LED reverse voltage, VR	6 V	Avoid reverse bias in normal service; add antiparallel protection where reverse transients are possible	Source-transcribed; citation-index verification pending (exact PDF)
Collector-emitter voltage, VCEO	80 V	Use the receiver logic rail, commonly 3.3 V or 5 V, with margin	Source-transcribed; citation-index verification pending (exact PDF)
Emitter-collector voltage, VECO	6 V	Do not reverse the output transistor	Source-transcribed; citation-index verification pending (exact PDF)
Collector current, IC	50 mA	Logic pull-up current is normally well below 1 mA; verify low-level voltage at the chosen IF	Source-transcribed; citation-index verification pending (exact PDF)
Isolation voltage	5,000 Vrms, 1 minute test	Treat as a dielectric withstand test, not a continuous working-voltage rating or system safety approval	Source-transcribed; citation-index verification pending (exact PDF)
Operating ambient temperature	−30 to +100 °C	Derate current and validate CTR/threshold margin over the product’s real temperature range	Source-transcribed; citation-index verification pending (exact PDF)
CTR / collector current rank	IC = 4–8 mA at IF = 5 mA, VCE = 5 V, Ta = 25 °C; equivalent to 80–160% CTR	Design to the 80% lower bound at the stated test point, then add temperature and aging margin	Source-transcribed; citation-index verification pending (exact PDF)
LED forward voltage, VF	Not an absolute maximum; approximately 1.2 V typical and 1.4 V maximum at IF = 20 mA	Use the applicable worst-case VF and GPIO VOH/VOL when finalizing the resistor	Source-transcribed; citation-index verification pending (exact PDF)

2. Pinout & Connections

Table

Pin Number	Pin Name	Description	Best Practice
1	Anode	Input LED anode	Drive through a series current-limiting resistor; never connect directly to a supply or GPIO.
2	Cathode	Input LED cathode	Return to the input-side ground. Keep it electrically separate from the output-side ground when isolation is required.
3	Emitter	Phototransistor emitter	Connect to the receiver-side ground for the usual common-emitter logic circuit.
4	Collector	Phototransistor collector	Pull up to the receiver logic rail; read the signal at this node. The logic is inverted.

Pin numbering and functions are source-transcribed from the exact-device specification; citation-index verification is pending (Sharp/Socle exact-device specification). Confirm the PCB footprint’s pin-1 mark and orientation before release.

3. Standard Application Circuit

Text
INPUT SIDE (GND_IN)                    OUTPUT SIDE (GND_OUT)

3.3 V or 5 V                           VLOGIC (3.3 V or 5 V)
    |                                       |
 GPIO/driver                               RPULLUP
    |                                       |
 RLED                                      +---- OUT (inverted)
    |                                       |
 pin 1 A  ->|  pin 2 K      isolation      pin 4 C
    |___________ GND_IN       barrier       pin 3 E
                                                |
                                              GND_OUT

When the input LED is on, the output transistor conducts and pulls OUT low. When the LED is off, the pull-up resistor makes OUT high.

LED resistor calculation

Use:

RLED = (VDRIVE − VF − VDRIVER_DROP) / IF

The following nominal examples target approximately 5 mA and use VF = 1.2 V only as a calculation example. They do not replace a worst-case tolerance calculation.

Table

Drive	Ideal resistance at 5 mA	Suggested standard value	Nominal LED current with VF = 1.2 V and zero driver drop
3.3 V	(3.3 − 1.2) / 0.005 = 420 Ω	430 Ω	(3.3 − 1.2) / 430 = 4.88 mA
5.0 V	(5.0 − 1.2) / 0.005 = 760 Ω	750 Ω	(5.0 − 1.2) / 750 = 5.07 mA

For production design, repeat the calculation using minimum/maximum drive voltage, GPIO output-high drop at load, resistor tolerance, and the LED VF range across temperature. A 10 kΩ output pull-up is a reasonable low-current starting example (0.5 mA at 5 V or 0.33 mA at 3.3 V), but it is not a manufacturer-mandated value; choose it from receiver threshold, leakage, noise, and speed requirements. The CTR test at VCE = 5 V does not by itself guarantee transistor saturation in every pull-up circuit.

4. PCB Layout & Routing Guidelines

Preserve the isolation barrier: do not route copper, planes, vias, test pads, silkscreen conductive ink, or mounting hardware through the required creepage/clearance corridor between pins 1–2 and pins 3–4.
Keep input-side and output-side grounds as separate nets; joining them elsewhere defeats galvanic isolation.
Place the LED resistor close to the driving source or optocoupler input and keep its loop short, especially in noisy environments.
Place the collector pull-up close to the receiver input, and keep the collector node away from fast, high-voltage switching nodes because it is relatively high impedance when the optocoupler is off.
Validate the actual land pattern, package outline, solder-mask clearance, and pin-1 orientation against the exact PC817X1CSP9F package drawing before fabrication; package-dimension citation indexing remains unresolved.

5. Common Pitfalls

Using a generic PC817 CTR range for this ordering code. PC817X1CSP9F is the A-rank device: its exact specification gives IC = 4–8 mA at IF = 5 mA and VCE = 5 V, i.e. 80–160% CTR at 25 °C—not the broad 50–600% family range (exact PDF; citation-index verification pending).
Treating 5 kVrms withstand as a continuous system rating. The one-minute isolation test does not establish allowable continuous working voltage, pollution degree, reinforced/basic insulation status, or compliance of the finished product. Determine those from the applicable safety standard, PCB creepage/clearance, enclosure, and certification requirements.

6. Popular Alternatives & Equivalents

All alternatives below are functional alternatives only unless explicitly stated otherwise. A matching four-pin phototransistor function does not prove pin-compatible land pattern, creepage, CTR bin, timing, safety approvals, or drop-in qualification.

Table

Alternative	Compatibility label	Notes
Everlight EL817S1(A)(TU)	Functional alternative; footprint compatibility not proven	Single-channel SMD phototransistor optocoupler, 4-SMD library entry. Verify CTR rank, exact body/lead geometry, isolation rating, and approvals against Everlight’s manufacturer datasheet (Everlight EL817 series PDF).
Lite-On LTV-817S-TA1	Functional alternative; footprint compatibility not proven	Single-channel 4-SMD phototransistor optocoupler. Confirm the selected CTR suffix/bin and tape orientation; do not assume the unsuffixed family part matches PC817X1CSP9F A-rank (Lite-On manufacturer datasheet mirror).

7. Sourcing & Purchasing Guide

Table

Attribute	Details
Exact MPN	PC817X1CSP9F
Manufacturer / brand	Sharp/Socle ordering code; the current Flux library record identifies Socle
Package	4-SMD surface-mount optocoupler; exact package dimensions remain citation-index unresolved
CTR rank	A rank: 80–160% at IF = 5 mA, VCE = 5 V, Ta = 25 °C (source-transcribed; citation-index verification pending)
Authorized / major distributor listings	Mouser, DigiKey, and LCSC C97308
Library availability	PC817X1CSP9F Flux part
MOQ	Unresolved. Distributor order minimums are region-, account-, and date-dependent; verify on the live listing before purchase.
Packaging options	Tape-and-reel is the expected SMD purchasing format; exact-device packaging and distributor cut-tape availability remain unverified. Do not assume a family reel quantity applies to this suffix.
Reel quantity	Unresolved. The exact tape/reel quantity could not be citation-verified; request the packaging specification or verify the distributor’s manufacturer-standard package field.
Purchasing checks	Match the complete suffix X1CSP9F, A-rank CTR, SMD lead form, tape orientation, date/lot traceability, and required safety approvals. Avoid substituting a generic “PC817” without reviewing the exact suffix datasheet.
Availability and lifecycle	Live stock and lifecycle were not independently verified for this guide. Check the distributor listing and manufacturer product-status notice at the time of procurement.
Sourcing advice	Prefer manufacturer-authorized/franchised distributors with lot traceability. Unverified marketplace stock creates counterfeit and incorrect CTR-bin risk; confirm authorization, complete ordering code, package, and packaging before purchase.

Sources

Sharp/Socle, PC817X1CSP9F exact-device specification, revision/date not citation-verified: https://datasheet.chipsmall.com/PC817X1CSP9F/163617.pdf
Alternate mirror of the exact-device specification, revision/date not citation-verified: https://www.micro-semiconductor.si/datasheet/1b-PC817X1CSP9F.pdf
Sharp, PC817X Series family datasheet; use for family context only, not to override the exact ordering-code rank/package: https://media.digikey.com/pdf/Data%20Sheets/Sharp%20PDFs/PC817X%20Series.pdf
Everlight, EL817 series datasheet, revision/date not verified in this guide: https://www.everlighteurope.com/custom/files/datasheets/DPC-0000046.pdf
Lite-On, LTV-817/827/847 series datasheet, revision/date not verified in this guide: https://media.digikey.com/pdf/Data%20Sheets/Lite-On%20PDFs/LTV-817_827_847%28M,S,S_TA1%29.pdf

Document status: useful engineering guide with explicit unresolved evidence. Re-run immutable datasheet extraction before treating source-transcribed package dimensions, maxima, revision/date, or packaging quantity as citation-verified release data.

1. Quick Specifications
2. Pinout & Connections
3. Standard Application Circuit
LED resistor calculation
4. PCB Layout & Routing Guidelines
5. Common Pitfalls
6. Popular Alternatives & Equivalents
7. Sourcing & Purchasing Guide
Sources