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.
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
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
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
Temperature sweep at current settings
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
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.
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.
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.
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