MIC1557YM5 TR Microchip Generator or Oscillator (SOT23 (5-Pin)) In Stock
Microchip MIC1557YM5 TR is a CMOS RC oscillator timer in a 5-pin SOT-23 package, operating across a 2.7 V to 18 V supply range with low power consumption for timing and oscillator applications. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- ACTIVE
- Datasheet
- MIC1557YM5 TR Datasheet PDF
- Category
- Generator or Oscillator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Wide 2.7 V to 18 V supply range covers both 3.3 V digital logic systems and legacy 12 V analog circuits with a single timer IC
- CMOS output stage delivers rail-to-rail switching with minimal quiescent current, extending battery run time in portable timer circuits
- 5-pin SOT-23 package offers a 50% smaller footprint than traditional 8-pin DIP or SOIC 555 timers for space-constrained PCB designs
Applications
The MIC1557YM5 TR is a direct CMOS replacement for the classic 555 timer, suited for low-power pulse generation, monostable one-shot timing, and astable oscillator circuits in battery-operated consumer electronics and IoT devices. Its wide supply range makes it compatible with both 3.3 V microcontroller-adjacent circuits and 12 V industrial control panels without redesign. Typical uses include LED blink timers, debounce circuits, watchdog pulse generators, and precision delay circuits in handheld instruments and home automation modules.
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
How does MIC1557YM5 TR's supply range compare to a standard bipolar 555 timer for a 3.3 V system?
Standard bipolar 555 timers typically require a minimum of 4.5 V to operate reliably, making them incompatible with 3.3 V logic rails. The MIC1557YM5 TR operates from as low as 2.7 V, enabling direct integration into 3.3 V microcontroller systems without level shifters. At the upper end its 18 V maximum supply also covers 12 V automotive and industrial control applications, giving a single component 2.7 V to 18 V coverage across diverse platform voltages.
For a 1 Hz LED blink circuit, what RC values pair with MIC1557YM5 TR in astable mode?
In astable mode the MIC1557YM5 TR oscillation frequency is set by external resistors and a capacitor per the standard RC timer equation f ≈ 1.44 / ((R1 + 2×R2) × C). For a 1 Hz output, values such as R1 = 1 kΩ, R2 = 680 kΩ, and C = 1 µF yield approximately 1 Hz at 50% duty cycle. These passive components cost under $0.05 combined, making the MIC1557YM5 TR one of the lowest-cost blink timer solutions available in a 5-pin SOT-23.
When should MIC1557YM5 TR be chosen over a microcontroller PWM output for generating a periodic pulse in a battery design?
MIC1557YM5 TR is preferable when the microcontroller must enter deep sleep between events to conserve power, as it autonomously generates pulses with no CPU cycles consumed. It draws only a few microamps of quiescent current versus the milliamps a microcontroller consumes while awake running a software PWM loop. For fixed-frequency timing tasks such as a 100 Hz sensor sampling trigger or a 10 ms watchdog pulse, the dedicated hardware timer delivers a deterministic signal while allowing the MCU to remain in sub-µA sleep indefinitely.
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