MC33187 is a long duration automotive timer produced by Motorola. It can be used in various long duration timing functions. The chip works in the temperature range from -40°C to +85°C, and the operating voltage range is from 5V to 18V. The output current capability is 400mA.
The MC33187 is a long‑duration automotive timer IC designed primarily as a defogger timer but suitable for various timing functions. It is supplied in an 8‑pin SO‑8 surface‑mount package and features integrated debounce circuitry, toggle input, and low external component count.
The document provides electrical ratings, pin descriptions, recommended external component values, and application notes for defogger and courtesy‑light timer circuits, along with mechanical dimensions and ordering information.
| Operating Ambient Temperature | -40°C to 85°C |
|---|---|
| Operating Voltage Range | 5 V to 18 V |
| Output Current Capability | 400 mA |
| Pin 5 Voltage (VCC) | 18 V |
| Pin 3 Voltage | 18 V |
| Pin 3 Current | 400 mA |
| Storage Temperature | -55°C to +175°C |
| Operating Junction Temperature | -40°C to +150°C |
| Oscillator Frequency | 300 Hz – 400 Hz |
| Internal Counter Divider Steps | 4096 |
| Output Leakage Current @ Vpin3 | ≈100 µA |
| Output Saturation Voltage @ Vout (low) | 1.35 V |
| Output Saturation Voltage @ Vout (high) | 2.60 V |
| Supply Current @ VCC=5 V | 0.5 mA – 3.5 mA |
| VCC Zener Regulation | 6.0 V – 8.0 V |
| Time‑Select Current @ TS=5 V | 25 µA – 200 µA |
| Recommended Cs | 100 nF |
| Recommended Rt | 220 kΩ |
| Recommended Ct | 10 nF |
| Recommended Rin | 100 kΩ |
| Recommended C1 | 220 nF |
| Protection Zener Diode | MZD16 |
The MC33187 operates from 5 V up to 18 V.
It can source up to 400 mA of output current.
The internal oscillator runs at 300 Hz to 400 Hz.