My Inquiry
My Account
Microchip Technology MIC1557BM5-TR
- Part No.:
- MIC1557BM5-TR
- Manufacturer:
- Microchip Technology
- Category:
- Programmable Timers and Oscillators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MIC1557BM5-TR.pdf
- Description:
- IC OSC SINGLE TIMER 5MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,427
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC1557BM5-TR from Microchip Technology is a micropower CMOS astable oscillator IC designed for precision timing and low-power clock generation. It operates from +2.7V to +18V, delivers 50% duty cycle square waves using one resistor and one capacitor, features chip-select shutdown (<1 μA), and supports timing from microseconds to hours in SOT-23-5 packaging - ideal for battery-powered LED blinkers and voltage converter control.
For engineers reviewing the MIC1557BM5-TR datasheet, MIC1557BM5-TR pinout, MIC1557BM5-TR application, or MIC1557BM5-TR equivalent, key selection criteria include its single-pin T/T input architecture, <1 μA shutdown current, ±2% astable timing accuracy, and guaranteed operation across –40°C to +85°C ambient temperature.
Technical Context
The MIC1557BM5-TR implements a rail-to-rail CMOS totem-pole output stage with internal threshold/trigger comparators sharing a single T/T pin, eliminating external pin routing complexity. Its dominant-threshold logic ensures stable oscillation by switching output low when T/T ≥ 2/3VS and high when T/T ≤ 1/3VS.
Chip select (CS) provides active-high enable/disable control with hysteresis (on > 2/3VS, off < 1/3VS), enabling deterministic power gating without external logic. The device lacks discharge and frequency control pins found in legacy 555 timers, simplifying layout while maintaining sub-15Ω output on-resistance and <0.005%/°C temperature stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +18V - supports wide-input industrial and automotive power rails without regulation. |
| Shutdown Current | <1 μA typical - enables multi-year battery life in always-on sensor nodes and portable devices. |
| Astable Timing Accuracy | ±2% at 5V - ensures predictable frequency over component tolerances in timing-critical feedback loops. |
| Max Oscillation Frequency | 5 MHz - sufficient for high-speed charge-pump drivers and audible tone generation up to 20 kHz. |
| Output On-Resistance | <15 Ω - drives 20 mA loads directly without external buffers, reducing BOM count. |
| Temp Stability | <0.005%/°C - maintains timing integrity across industrial temperature ranges without calibration. |
| Supply Stability | <0.055%/V - eliminates need for tight supply regulation in variable-voltage systems like solar chargers. |
Pinout & Package
Package: 5-pin SOT-23 (M5), 2.9 mm × 1.6 mm × 1.1 mm body, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (T/T) | Threshold/Trigger Input | Single bidirectional node internally connected to both comparators; sets output high when ≤1/3VS, low when ≥2/3VS. |
| 2 (GND) | Ground Reference | Primary return path for supply and output current; must be low-impedance for stable timing. |
| 3 (CS) | Chip Select/Reset | Active-high enable: forces output low and reduces supply current to <1 μA when pulled below 1/3VS. |
| 4 (VS) | Supply Input | Accepts +2.7V to +18V; requires local 0.1 μF ceramic decoupling capacitor for noise immunity. |
| 5 (OUT) | CMOS Totem-Pole Output | Rail-to-rail switching with <0.3 V drop at 20 mA sink, capable of driving logic inputs or small MOSFET gates directly. |
Key Features
| Feature | Design Value |
|---|---|
| Single-pin T/T interface | Reduces external component count and PCB footprint versus dual-input timer ICs like MIC1555. |
| Chip-select shutdown | Enables system-level power management via microcontroller GPIO without additional MOSFET switches. |
| 50% duty cycle oscillator | Eliminates need for external duty-cycle correction circuitry in symmetric clocking applications. |
| Zero-leakage inputs | Input currents <50 nA allow use with high-value RC networks for long time delays without drift. |
| Rail-to-rail CMOS output | Provides full logic swing to interface directly with 3.3V or 5V digital systems without level shifters. |
Applications
| Battery-Powered LED Blinker | Voltage Converter Clock Generator |
|---|---|
Use Scenario: Low-duty-cycle flashing indicator in remote sensors or wearables powered by coin cells. IC Role / Device Role / Timing Role: Astable oscillator generating precise 0.5–2 Hz square wave to drive LED through series resistor. Use Value: <1 μA shutdown current extends battery life beyond 5 years; single RC network minimizes bill-of-materials. | Use Scenario: Fixed-frequency clock source for boost/buck DC-DC converters in portable medical devices. IC Role / Device Role / Timing Role: Primary timing element setting switching frequency between 100 kHz and 2 MHz. Use Value: ±2% timing accuracy ensures consistent regulation; rail-to-rail output directly drives gate driver inputs. |
| Missing Pulse Detector | Linear Sweep Generator |
Use Scenario: Monitoring periodic signals from encoders or flow meters where pulse absence indicates fault. IC Role / Device Role / Timing Role: Monostable trigger configured via external RC to generate timeout window after each input edge. Use Value: Threshold precedence logic prevents false triggers during noisy transitions; works across full 2.7–18V supply range. | Use Scenario: Generating linear ramp waveforms for analog test equipment or display bias control. IC Role / Device Role / Timing Role: Astable oscillator controlling constant-current source charging/discharging capacitor. Use Value: <0.005%/°C tempco ensures sweep linearity over operating temperature; zero-leakage inputs preserve ramp fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC1555YM5-TR | Separate TRG/THR pins; monostable + astable modes; no CS pin; higher quiescent current (255 μA typ @5V). | Required for one-shot timing or asymmetric oscillators; unsuitable for ultra-low-power shutdown scenarios. | Select when dual-input flexibility or non-50% duty cycles are needed without diodes. |
| LMC555IM5X/NOPB | Pin-compatible 555 variant; bipolar process; 100 μA quiescent current; no chip-select; ±1% timing accuracy. | Lacks micropower shutdown; limited to ≤6V supply; higher tempco (±50 ppm/°C); not rated for 18V operation. | Choose only for legacy 555 drop-in replacement where supply is ≤6V and shutdown is unnecessary. |
Compared with MIC1557BM5-TR, MIC1555YM5-TR offers greater configuration flexibility but sacrifices micropower capability, while LMC555IM5X/NOPB provides familiar 555 pinout and lower cost but cannot meet the same voltage, temperature, or power requirements.
Availability
MIC1557BM5-TR is available at Aetrix Electronics and suitable for battery-powered LED blinkers, voltage converter clock generation, missing pulse detection, linear sweep generation, and micropower oscillator applications requiring stable component supply across industrial temperature ranges.
Supply support for MIC1557BM5-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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, interface, and timing solutions with ISO/TS-16949 and ISO 9001 certifications.
The MIC1555/57 family was developed to replace legacy bipolar 555 timers with CMOS-based, micropower, precision RC oscillators optimized for modern low-voltage and battery-constrained systems.
FAQ
What is the maximum operating supply voltage for MIC1557BM5-TR?
The MIC1557BM5-TR has an absolute maximum supply voltage of +22V, but its functional operating range is specified from +2.7V to +18V. Operation above +18V may cause permanent damage or unpredictable behavior. For reliable long-term performance, design within the +2.7V to +18V range, with appropriate derating for temperature and board-level transients.
Does MIC1557BM5-TR support monostable (one-shot) operation?
No, MIC1557BM5-TR is designed exclusively for astable (oscillator) operation. Unlike the MIC1555, it integrates threshold and trigger functions into a single T/T pin and lacks independent TRG/THR inputs required for monostable timing. For one-shot applications, use MIC1555YM5-TR or similar variants with separate trigger and threshold pins.
How does the chip select (CS) pin function on MIC1557BM5-TR?
The CS pin on MIC1557BM5-TR is an active-high enable input with built-in hysteresis: the device operates normally when CS > 2/3VS, and enters <1 μA shutdown when CS < 1/3VS. Floating CS causes undefined behavior; unused CS must be tied to VS. This allows precise system-level power gating without external components.
Can MIC1557BM5-TR generate non-50% duty cycle waveforms?
Yes, MIC1557BM5-TR can generate adjustable duty cycles using two diodes and two resistors in the timing network, as documented in Figure 5-2 of DS20005730B. Standard configuration yields 50% duty cycle with one resistor and one capacitor; adding diode-resistor paths separates charge and discharge paths to achieve ratios from 1% to 99%, though accuracy degrades at temperature extremes due to diode Vf variation.
What is the recommended decoupling for MIC1557BM5-TR?
A 0.1 μF ceramic capacitor placed as close as possible to the VS and GND pins of MIC1557BM5-TR is required for stable operation. This minimizes supply noise coupling into the precision comparator reference network. For high-noise environments or high-current loads, add a bulk 1–10 μF tantalum or aluminum electrolytic capacitor in parallel on the same supply rail.
MIC1557BM5-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:
- -
MIC1557BM5-TR FAQ
1.How can I place an order for MIC1557BM5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC1557BM5-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 MIC1557BM5-TR reliable?
The price and inventory of MIC1557BM5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC1557BM5-TR is usually 5 days.
3.What payment methods are accepted for MIC1557BM5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC1557BM5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC1557BM5-TR?
MIC1557BM5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC1557BM5-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 MIC1557BM5-TR?
For technical support, including MIC1557BM5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC1557BM5-TR requirements.
6.How does Aetrix verify that MIC1557BM5-TR is sourced from the original manufacturer or authorized distributors?
All MIC1557BM5-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 MIC1557BM5-TR meets industry standards.
7.What is the process for return or replacement of MIC1557BM5-TR?
All MIC1557BM5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC1557BM5-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 MIC1557BM5-TR part is unused and in its original packaging.
Return procedure for MIC1557BM5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC1557BM5-TR Tags
-
NE555DR
Texas Instruments
-
SA555DR
Texas Instruments
-
NA555DR
Texas Instruments
-
SE555DR
Texas Instruments
-
NE555P
Texas Instruments
-
CD4541BM96
Texas Instruments
-
CD4541BE
Texas Instruments
-
TLC555QDR
Texas Instruments
-
TLC555IDR
Texas Instruments
-
TLC555QDRQ1
Texas Instruments
-
TPL5010DDCR
Texas Instruments
-
TLC555CP
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
