MIC1555MU Microchip Crystal or Oscillator (Other) In Stock
Microchip MIC1555MU is a CMOS RC timer and oscillator IC compatible with 555-type timing functions, operating from 2V to 15V supply with low supply current, packaged in a compact µMAX (SOT-23-5-like) footprint. Ideal for monostable pulse generation, astable oscillator, and PWM applications in portable and battery-powered systems.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 11
- Lifecycle
- ACTIVE
- Datasheet
- MIC1555MU Datasheet PDF
- Category
- Crystal or Oscillator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Wide supply voltage range of 2V to 15V enabling use in both 3.3V CMOS and 12V analog-powered timer circuits
- CMOS architecture consuming only microampere-level quiescent current for extended battery life in portable designs
- Fully compatible with standard 555 timer pinout logic enabling direct drop-in replacement in existing RC timer circuits
- Compact µMAX surface-mount package reducing board area compared to 8-pin DIP 555 timer packages by over 80%
Applications
The MIC1555MU RC timer oscillator is used in pulse-width modulation circuits, monostable delay generators, and LED blinking applications where a simple external RC network sets the timing period from microseconds to seconds. Its CMOS construction and 2V to 15V supply range make it well-suited for battery management circuits, low-power sensor wake-up timers, and portable instrument trigger circuits. Consumer electronics, industrial timing modules, and IoT sensor nodes benefit from its small µMAX footprint and low standby power consumption.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Over what supply voltage range does the MIC1555MU operate and how does this compare to bipolar 555 timers?
The MIC1555MU operates over a supply voltage range of 2V to 15V, enabling it to work in low-voltage 3.3V microcontroller systems as well as 12V automotive and industrial circuits. Traditional bipolar 555 timers typically require a minimum of 4.5V to 5V, so the MIC1555MU's 2V lower supply limit is a significant advantage for battery-powered applications where the supply may droop below 3V.
How is the output frequency of the MIC1555MU set in an astable oscillator configuration?
In astable mode, the MIC1555MU output frequency is determined by two external resistors (RA and RB) and a timing capacitor C using the standard 555 formula: f = 1.44 / ((RA + 2×RB) × C). For example, RA = 10 kΩ, RB = 10 kΩ, and C = 10 nF produces an output frequency of approximately 4.8 kHz, with a duty cycle adjustable by varying the ratio of RA to RB.
What is the quiescent supply current of the MIC1555MU and how does it affect battery life?
The MIC1555MU's CMOS architecture results in a quiescent supply current in the range of 60 µA to 100 µA at 5V, significantly lower than the 3 mA to 6 mA drawn by bipolar 555 timers. Running on a 250 mAh AAA battery in a low-duty-cycle monostable application, the MIC1555MU quiescent draw alone would allow over 2,500 hours of standby operation, extending product life between battery replacements.
Can the MIC1555MU directly drive a MOSFET gate or LED from its output pin?
Yes, the MIC1555MU output stage can source and sink up to 100 mA at 5V supply, enabling it to directly drive small signal MOSFETs and low-power LEDs without a buffer stage. At 5V, a red LED with 2V forward voltage and 20 mA current requires a 150 Ω series resistor; the output can handle this load continuously while maintaining a clean rail-to-rail voltage swing from near 0V to near VCC.
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