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Microchip Technology MIC1555BM5-TR
- Part No.:
- MIC1555BM5-TR
- Manufacturer:
- Microchip Technology
- Category:
- Programmable Timers and Oscillators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MIC1555BM5-TR.pdf
- Description:
- IC OSC SINGLE TIMER 5MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,750
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Product details
Overview
MIC1555BM5-TR from Microchip Technology is a CMOS RC timer/oscillator IC designed for precision monostable (one-shot) and astable (oscillator) operation with rail-to-rail output. It operates from +2.7V to +18V, delivers <0.005%/°C temperature stability and <0.055%/V supply stability, and supports timing ranges from microseconds to hours - used in micropower oscillators, missing pulse detectors, and LED blinkers.
For engineers reviewing the MIC1555BM5-TR datasheet, MIC1555BM5-TR pinout, MIC1555BM5-TR application, or MIC1555BM5-TR equivalent, key selection criteria include its SOT-23-5 package, 5-pin configuration with dominant threshold input, 240 μA typical supply current at 5V, and compatibility with single-resistor/single-capacitor 50% square-wave generation.
Technical Context
The MIC1555BM5-TR implements a BiCMOS RS flip-flop architecture with separate TRG (active-low trigger) and THR (active-high dominant threshold) inputs, enabling precise monostable timing and flexible astable configurations when pins are tied. Its internal resistive divider sets trip points at ~1/3VS and ~2/3VS, ensuring voltage-independent timing accuracy.
It features a CMOS totem-pole output with <15Ω on-resistance, no cross-conduction spikes, and supports both rising- and falling-edge triggered monostable circuits via AC coupling. The device lacks FC and open-collector discharge pins found in legacy 555 timers, simplifying layout while retaining functional equivalence in timing-critical embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +18V - enables direct operation from common industrial rails (3.3V, 5V, 12V) without regulation. |
| Supply Current (Typ.) | 240 μA at VS = 5V - supports battery-powered applications with multi-year runtime. |
| Timing Accuracy | ±2% - ensures predictable pulse width or oscillator frequency without trimming components. |
| Temp. Stability | <0.005%/°C - minimizes drift across –40°C to +85°C ambient range in automotive and industrial environments. |
| Output On-Resistance | <15Ω - drives 20 mA loads directly with <0.5V drop at 5V supply, eliminating external buffers. |
| Input Leakage | <50 nA at VS = 15V - preserves RC time constants with high-value timing resistors up to 1 MΩ. |
| Max. Astable Frequency | 5 MHz - supports high-speed clock generation using small CT (e.g., 47 pF) and RT (1 kΩ). |
Pinout & Package
Package: SOT-23-5 (M5), 5-pin surface-mount, 2.9 mm × 1.6 mm × 1.1 mm body height, tape-and-reel (3,000/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VS) | Power Supply Input | Accepts +2.7V to +18V; requires local 0.1 μF decoupling capacitor for noise immunity. |
| 2 (GND) | Ground Reference | Return path for supply and signal currents; must be low-impedance connection to minimize timing error. |
| 3 (OUT) | CMOS Totem-Pole Output | Rail-to-rail switching (0.08–0.3 V low, 3.8–14.7 V high); sinks/sources 20 mA with minimal voltage drop. |
| 4 (TRG) | Active-Low Trigger Input | Asserted when voltage ≤2/3VS; initiates monostable output high pulse; overridden by THR if both active. |
| 5 (THG) | Active-High Dominant Threshold Input | Asserted when voltage ≥2/3VS; forces output low regardless of TRG state; defines timing end point in monostable mode. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-leakage inputs | Trigger and threshold leakage <50 nA enables use of >1 MΩ timing resistors without significant error. |
| Threshold precedence logic | THR overrides TRG, preventing unintended retriggering during long pulses and ensuring deterministic one-shot behavior. |
| 50% square wave generation | One resistor + one capacitor yields precise 50% duty cycle in astable mode - reduces component count vs. classic 555 designs. |
| No cross-conduction spikes | Eliminates shoot-through current during output transitions, improving EMI performance and power efficiency. |
| Rail-to-rail output swing | Drives logic interfaces directly across full supply range - compatible with 3.3V, 5V, and 12V systems without level shifters. |
Applications
| Precision Timer | Pulse Generation |
|---|---|
Use Scenario: Generating accurate time delays in sensor wake-up circuits or microcontroller reset sequencing. IC Role / Device Role / Timing Role: Monostable one-shot providing fixed-duration enable pulses synchronized to external events. Use Value: ±2% timing accuracy and <0.005%/°C drift ensure consistent delay across temperature without calibration. | Use Scenario: Creating clean, jitter-free clock signals for low-power peripherals like ADCs or serial transceivers. IC Role / Device Role / Timing Role: Astable oscillator generating stable square waves from 1 Hz to 5 MHz using minimal external parts. Use Value: Single-R/C 50% duty cycle output eliminates need for duty-cycle correction circuitry, reducing BOM cost and board area. |
| Missing Pulse Detector | LED Blinker |
Use Scenario: Monitoring periodic signals (e.g., encoder outputs or watchdog pulses) and asserting fault flags when intervals exceed threshold. IC Role / Device Role / Timing Role: Monostable configured as retriggerable one-shot; output stays high only while pulses arrive within expected window. Use Value: Dominant THR input prevents false resets during pulse bursts, ensuring reliable detection of true missing-pulse conditions. | Use Scenario: Driving indicator LEDs in portable medical devices or IoT sensors where ultra-low quiescent current is critical. IC Role / Device Role / Timing Role: Astable oscillator controlling LED on/off periods with adjustable frequency via R/C values. Use Value: 240 μA typical supply current at 5V allows multi-year battery life in intermittent-blink applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RC timer/oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555DR | Higher supply current (3–6 mA), bipolar process, open-collector discharge pin, no chip select, wider temp range (–55°C to +125°C). | Requires external pull-up for discharge control; less suitable for micropower designs but more robust in high-noise industrial settings. | Select NE555DR only when legacy 555 footprint compatibility or extended temperature operation is mandatory. |
| MIC1557YM5-TR | Dedicated astable-only variant with integrated chip select (CS) pin; <1 μA shutdown current; no separate TRG/THR pins. | Optimized for always-on oscillator applications requiring on/off control; cannot perform monostable functions. | Choose MIC1557YM5-TR when system requires low-power oscillator enable/disable without monostable capability. |
Compared with NE555DR and MIC1557YM5-TR, the MIC1555BM5-TR uniquely balances micropower operation, monostable/astable dual-mode flexibility, and SOT-23-5 compactness - making it optimal for space-constrained, battery-sensitive designs needing both timing modes.
Availability
MIC1555BM5-TR is available at Aetrix Electronics and suitable for precision timer, missing pulse detector, and LED blinker applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC1555BM5-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog, interface, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MIC1555 family was developed as part of Microchip's IttyBitty product line to deliver ultra-small, low-power, pin-compatible alternatives to legacy 555 timers for modern embedded timing applications.
FAQ
What is the operating temperature range for MIC1555BM5-TR?
The MIC1555BM5-TR is rated for –40°C to +85°C ambient temperature operation, matching industrial-grade requirements. This range is confirmed in the Electrical Characteristics table and Package Thermal Resistance section of DS20005730B, and applies specifically to the SOT-23-5 (M5) package variant. The device maintains timing accuracy and output drive capability across this full range.
Can MIC1555BM5-TR be used as a drop-in replacement for standard 555 timers?
The MIC1555BM5-TR provides functional equivalence to the 555 timer in both monostable and astable modes but is not pin-compatible due to different pin assignments (e.g., no DISCHARGE or CONTROL pins). Its SOT-23-5 pinout (VS, GND, OUT, TRG, THG) requires PCB redesign. However, its rail-to-rail output, micropower consumption, and zero-leakage inputs offer measurable advantages over bipolar 555s in new designs.
Does MIC1555BM5-TR support shutdown or low-power mode?
No - the MIC1555BM5-TR does not include a chip select (CS) pin and therefore lacks hardware shutdown capability. That function is exclusive to the MIC1555YMU (UTDFN) and MIC1557 variants. For applications requiring <1 μA standby current, MIC1557YM5-TR or MIC1555YMU-T5 should be selected instead of MIC1555BM5-TR.
What is the maximum load the MIC1555BM5-TR output can drive?
The MIC1555BM5-TR output can sink or source up to 20 mA while maintaining specified voltage levels: <0.5 V low at 5V supply and >3.8 V high at 5V supply. This is verified in the "Output Voltage Drop" specification (DS20005730B, page 5). Exceeding 20 mA may cause excessive voltage drop or thermal stress, especially in continuous operation.
How does MIC1555BM5-TR achieve timing accuracy independent of supply voltage?
The MIC1555BM5-TR uses an internal resistive divider to set comparator thresholds at precisely 1/3VS and 2/3VS. Because RC timing depends on the ratio of capacitor voltage to these supply-scaled references - not absolute voltage - timing remains stable across the +2.7V to +18V supply range, with measured supply stability of <0.055%/V.
MIC1555BM5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- IttyBitty®
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Programmable Timer
- Count:
- -
- Frequency:
- 5MHz
- Voltage - Supply:
- 2.7V ~ 18V
- Current - Supply:
- 350 µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-5
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MIC1555BM5-TR FAQ
1.How can I place an order for MIC1555BM5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC1555BM5-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MIC1555BM5-TR reliable?
The price and inventory of MIC1555BM5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC1555BM5-TR is usually 5 days.
3.What payment methods are accepted for MIC1555BM5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC1555BM5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC1555BM5-TR?
MIC1555BM5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC1555BM5-TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MIC1555BM5-TR?
For technical support, including MIC1555BM5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC1555BM5-TR requirements.
6.How does Aetrix verify that MIC1555BM5-TR is sourced from the original manufacturer or authorized distributors?
All MIC1555BM5-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC1555BM5-TR meets industry standards.
7.What is the process for return or replacement of MIC1555BM5-TR?
All MIC1555BM5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC1555BM5-TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MIC1555BM5-TR part is unused and in its original packaging.
Return procedure for MIC1555BM5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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