AID AI Datasheet™ — ISOCOM TIL197/TIL198/TIL199 Optocouplers

High-density mounting photodarlington optocoupler family

The TIL197, TIL198 and TIL199 series use an infrared input LED and NPN silicon photodarlington output in space-efficient dual-in-line plastic packages. The A and B suffixes provide higher minimum current transfer ratio selections.

500%

Minimum CTR, standard family

1500%

Minimum CTR, B selection

5.3 kVRMS

Input-output isolation

35 V

BVCEO output rating

100 µs

Typical rise/fall time

Key features

High current transfer ratio photodarlington output for low input-current detection.
Package options: standard, 10 mm lead spread G, surface mount SM, tape and reel SMT&R.
Isolation rating suitable for signal transfer between different potentials and impedances.
All electrical parameters are stated as 100% tested by manufacturer.

Functional view

TIL19x optocoupler functional schematic: LED input optically coupled to photodarlington output

Functional schematic provided by the user: LED input side coupled across the isolation barrier to a photodarlington collector/emitter output.

Applications

Computer terminals
Industrial system controllers
Measuring instruments
Signal transmission between systems of different potentials and impedances

Ordering information

Order code	Meaning	Notes
TIL197 / TIL198 / TIL199	Standard minimum CTR 500%	Base part
TIL197A / TIL198A / TIL199A	Minimum CTR 1000%	A suffix
TIL197B / TIL198B / TIL199B	Minimum CTR 1500%	B suffix
Add G	10 mm lead spread	Package option
Add SM	Surface mount	Package option
Add SMT&R	Surface mount tape and reel	Packing option

Electrical characteristics at TA = 25°C unless otherwise noted

Parameter	Min	Typ	Max	Unit	Condition
Input forward voltage VF	1.2		1.4	V	IF = 20 mA
Input reverse voltage VR			5	V	IR = 10 µA
Input reverse current IR			10	µA	VR = 5 V
Collector-emitter breakdown BVCEO			35	V	IC = 0.5 mA
Emitter-collector breakdown BVECO			6	V	IE = 100 µA
Collector-emitter dark current ICEO			100	nA	VCE = 10 V
CTR: TIL197/TIL198/TIL199	500		7500	%	IF = 2 mA, VCE = 1 V
CTR: A suffix	1000		7500	%	IF = 2 mA, VCE = 1 V
CTR: B suffix	1500		7500	%	IF = 2 mA, VCE = 1 V
Collector-emitter saturation VCE(sat)		0.8	1.0	V	IF = 2 mA, IC = 10 mA
Input-output isolation voltage VISO	5300			VRMS	See note 1
Input-output isolation voltage VISO	7500			VPK	See note 1
Input-output isolation resistance RISO	5×10^10			Ω	VIO = 500 V
Output rise time tr		100		µs	VCC = 10 V, IC = 10 mA, RL = 100 Ω
Output fall time tf		100		µs	VCC = 10 V, IC = 10 mA, RL = 100 Ω

Absolute maximum ratings

Rating	Value	Unit
Storage temperature	-55 to +125	°C
Operating temperature	-55 to +100	°C
Lead soldering temperature	260 for 10 s	°C
Input diode forward current	50	mA
Input diode reverse voltage	6	V
Input diode power dissipation	70	mW
Output transistor collector-emitter voltage	35	V
Output transistor emitter-collector voltage	6	V
Output transistor power dissipation	150	mW
Total power dissipation	200; derate 2.67 mW/°C above 25°C	mW

Notes and operating cautions

Note 1: isolation measurements are made with input leads shorted together and output leads shorted together.

Recommended design practice is to keep LED current, output transistor power, output voltage, and isolation stress below the absolute limits with adequate system margin.

The full production model in this HTML uses the uploaded spreadsheet curve data for visual curves and interpolated design estimates. Values outside the charted region are flagged rather than silently extrapolated.

Interactive manufacturer characteristic curves

Move the cursor over any curve to read the nearest x,y point. The plotted points are taken from the latest attached accurate chart-data spreadsheet, including the corrected Figure 1, Figure 2, and Figure 3 data.

Original datasheet chart page

Coupled optocoupler model

Input LED current IF: mA

Collector-emitter voltage VCE: V

Ambient temperature TA: °C

CTR grade

Load resistor RL: Ω

Output supply VCC: V

CTR multiplier vs TA

Estimated IC

Estimated VCE(sat)

Collector power margin

Temperature sweep at current settings

Model structure: CTR multiplier = f(TA); collector current = f(IF,VCE,TA); VCE(sat) = f(IF,IC,TA); power derating = f(TA). Interpolation uses the uploaded curve data and datasheet anchors.

Design query assistant

Ask about CTR, VCE(sat), collector current, power derating, package options, pinout, or design checks. Responses are constrained to the datasheet and embedded model.

System design checker

Input supply VIN (V)

LED resistor RIN (Ω)

Output supply VCC (V)

Output pull-up RL (Ω)

Ambient TA (°C)

Logic low target VOL max (V)

Recommended resistor finder

Choose a target LED current and output pull-up target; the tool checks LED power, maximum IF derating, output current capability, saturation, and collector power.

Target IF (mA)

VIN high (V)

VCC (V)

Desired output sink current (mA)

TA (°C)

CTR grade

Application bring-up and layout procedure

Confirm isolation rating and safety standard requirements before selecting the package and board spacing.
Select the input LED current below the temperature-derated IF limit; verify LED power at worst-case input voltage.
Use the Application Studio to choose RIN and RL so the output reaches a valid logic-low level with margin across temperature.
Check collector current capability at the actual IF, VCE, and TA operating point; the photodarlington output is CTR-sensitive and temperature-sensitive.
Check collector power at high VCC, low RL, and maximum ambient temperature using the PVT Analysis tab.
Keep high-voltage and low-voltage domains physically separated; maintain creepage and clearance appropriate for the system safety requirement.
Measure CTR at production-relevant temperature points if the design depends on minimum CTR margin.

The embedded design checks are AID engineering estimates derived from the manufacturer datasheet and the uploaded spreadsheet curves. Final safety and compliance limits require system-level review and measurement.

Designer checklist

Design item	What to verify	Where to check
Input drive	IF remains below the derated limit over TA.	PVT Analysis / Application Studio
Output logic low	Predicted IC exceeds pull-up/load current and VCE(sat) stays below VOL target.	Application Studio
Thermal margin	Collector power is below the Fig. 1 derating curve at worst-case TA.	PVT Analysis
CTR grade	Standard, A, or B selection provides enough current-transfer margin.	PVT Analysis / AI Assistant
Isolation	Board spacing and safety requirements are consistent with the 5.3 kVRMS / 7.5 kVPK datasheet rating.	Full Specs / Mechanical Drawing

Pin functions

Device	Pin	Name	Type	Description
TIL197 4-pin	1	Anode	Input	Infrared LED anode
TIL197 4-pin	2	Cathode	Input	Infrared LED cathode
TIL197 4-pin	3	Emitter	Output	Photodarlington emitter
TIL197 4-pin	4	Collector	Output	Photodarlington collector
TIL198 dual	1/3	LED anodes	Input	Two-channel package per datasheet drawing
TIL198 dual	2/4	LED cathodes	Input	Two-channel package per datasheet drawing
TIL199 quad	1–8	Input pins	Input	Four-channel package per datasheet drawing
TIL199 quad	9–16	Output pins	Output	Four-channel package per datasheet drawing

Pinout drawing from datasheet

Package and mechanical information

The source datasheet provides mechanical drawings for TIL197, TIL198, TIL199, surface mount option SM, and 10 mm lead-spread option G. Dimensions are in millimeters.

Production Engineering Dashboard

This view converts the optocoupler datasheet into a production-screening and end-of-line design checker. It is intended for manufacturing, quality, product engineering and reliability teams qualifying TIL197/TIL198/TIL199 variants in isolated digital or low-speed control interfaces.

CTRLot-screened transfer ratio margin by grade

VOLPredicted saturation voltage at the load condition

PowerTemperature-derated collector dissipation margin

GuardbandProduction margin after selected drift allowance

Production Inputs

Device gradeStd

Ambient TA85°C

LED current IF2.0 mA

Collector voltage VCE1.0 V

System VCC5.0 V

Pull-up RL4700 Ω

Drift / aging guardband20%

Move a control to run the production decision engine.

Live Production Margins

—Predicted collector current

—Required load current

—Predicted low-level output

—Collector power margin

Production check	Computed result	Decision basis

Model basis: values use the same coupled AID v2.0 engine as the engineering datasheet: CTR multiplier versus temperature, collector current versus IF/VCE/TA, VCE(sat) versus IF/IC/TA, and temperature power derating. Chart-derived predictions are for design and production-planning guidance; final production limits should be validated against the supplier test method and customer qualification plan.

Recommended Incoming Inspection

Parameter	Suggested screen	Reason
CTR	Measure at IF = 2 mA, VCE = 1 V, TA = 25°C by grade.	Primary lot-to-lot functional variation and binning parameter.
VCE(sat)	Measure at IF = 2 mA, IC = 10 mA.	Confirms output low-level headroom for saturated switching.
ICEO	Spot-check at VCE = 10 V.	Protects leakage-sensitive high-impedance inputs.
Switching time	Characterize tr/tf at representative load.	Photodarlington output is appropriate for low-speed isolation, not high-speed logic.

Production Test Flow

1. Visual/packageConfirm DIP / G / SM option and pin-1 orientation.

2. LED sanityCheck VF and no reverse overstress.

3. CTR binScreen at datasheet CTR anchor.

4. Output lowVerify VCE(sat) under load.

5. Audit stressSample hot/cold units near application limits.

Important: the datasheet gives 100 µs typical rise and fall time. Use this family for isolated status, relay/PLC, instrument or low-speed control paths. Do not use it for high-speed timing isolation without direct timing validation.

Guardband Policy

Use standard 500% CTR parts only when the load-current margin remains positive after drift and temperature guardband.
Use A or B suffix parts when production yield requires additional CTR headroom.
At elevated temperature, verify both IF derating and collector power derating, not only nominal CTR.
For field reliability, avoid operating close to 50 mA input LED current or the 150 mW collector dissipation limit.

How to use this AID AI Datasheet™

1. Start with Overview and Full Specs

Use Overview for family selection and key limits. Use Full Specs for guaranteed datasheet parameters, absolute maximum ratings, and test conditions.

2. Use Performance Charts for curve reading

Open the Performance Charts tab, select a curve group, and move the cursor over the plot. The chart reads out the nearest x,y value directly from the uploaded accurate chart data. This is faster and less error-prone than reading the original PDF graph manually.

3. Use PVT Analysis for coupled behavior

Set IF, VCE, TA, CTR grade, RL, and VCC. The model updates CTR multiplier, estimated collector current, VCE(sat), and collector power margin. The model uses multi-dimensional interpolation: collector current is based on IF and VCE curve families at 25°C, scaled by the relative CTR temperature curve; VCE(sat) is based on IF and IC curve families and corrected by the temperature curve.

4. Use Application Studio before committing a schematic

The design checker evaluates LED resistor, LED current, output pull-up current, predicted saturation, VOL margin, and collector power. It flags conditions where the design may not sink enough current, exceeds temperature-derated LED current, or approaches collector power limits.

5. Interpretation of AID v2.0 results

Green status means the design is within the embedded model limits with reasonable margin. Yellow or red status means review the circuit, increase LED current within limits, increase RL, select a higher CTR grade, or reduce temperature stress.

Digitization and modeling accuracy disclaimer

Chart curves are digitized from the provided manufacturer datasheet and the attached accurate chart-data spreadsheet. Interpolated values are AID engineering estimates — verify with measurement for production release, safety-critical use, compliance submissions, and designs operating near limits.

QA status

This rebuild uses the latest uploaded spreadsheet data for all six performance figures. Figure 1 was reloaded from the newest corrected spreadsheet, the functional view now uses the user-provided optocoupler schematic image, and the previous recommended digital isolation circuit drawing was removed. All chart datasets were checked for valid numeric x,y points, active chart rendering hooks, model connectivity, and required tab presence.

AID contact

Analog Intelligent Design Inc. — www.aianalog.co