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Texas Instruments LMC555IMX/NOPB
- Part No.:
- LMC555IMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC555IMX/NOPB.pdf
- Description:
- IC OSC SINGLE TIMER 3MHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,992
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Product details
Overview
LMC555IMX/NOPB from Texas Instruments is a CMOS timer IC providing precision monostable and astable timing functions with 1.5V–15V supply operation, <1mW typical power dissipation at 5V, 3MHz maximum astable frequency, and pin-for-pin compatibility with legacy 555 timers in SOIC-8 packaging. It serves as a low-power timing engine in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the LMC555IMX/NOPB datasheet, LMC555IMX/NOPB pinout, LMC555IMX/NOPB application, or LMC555IMX/NOPB equivalent, key selection criteria include supply voltage range (1.5V min), output drive capability (−2mA/8mA at 5V), timing accuracy (±10% over temperature), and DSBGA/SOIC package options for space-constrained designs.
Technical Context
The LMC555IMX/NOPB implements a dual-comparator + SR latch architecture with internal resistor divider to generate precise 1/3 and 2/3 V+ thresholds. Its CMOS input stage delivers picoampere-level trigger, threshold, and reset currents-enabling high-impedance RC timing networks with minimal loading error.
It supports both monostable (one-shot) and astable (free-running oscillator) modes. In monostable mode, output pulse width is set by R×C (tH = 1.1RC); in astable mode, frequency and duty cycle are determined by two external resistors and one capacitor (f = 1.44/(RA + 2RB)C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 15V - enables direct interface with Li-ion, alkaline, and industrial 12V rails without regulation |
| Max Astable Frequency | 3MHz at 5V - supports high-speed PWM generation and clock synthesis up to audio band |
| Supply Current (Typ) | 250µA at 5V - reduces quiescent power in always-on timing circuits by >90% vs bipolar 555 |
| Output Drive | −2mA / +8mA at 5V - directly drives LEDs, small relays, or logic inputs without buffer stages |
| Timing Accuracy | ±10% over full temperature range - ensures predictable delay/waveform stability in unregulated environments |
| Trigger Input Current | 10pA max - permits use of megaohm-range timing resistors without timing drift |
| Reset Threshold | 0.7V typ at 5V - allows clean digital reset control using standard logic outputs |
Pinout & Package
LMC555IMX/NOPB is supplied in an 8-pin SOIC (D) package measuring 4.9mm × 6mm, with industry-standard 1.27mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power reference | System ground return path; must be low-impedance for stable timing |
| TRIGGER (Pin 2) | Input | Active-low edge-sensitive input that initiates monostable output when voltage falls below 1/3 V+ |
| OUTPUT (Pin 3) | Output | Push-pull CMOS output capable of sourcing/sinking up to 8mA/2mA at 5V |
| RESET (Pin 4) | Input | Asynchronous active-low override; forces output low regardless of trigger/threshold state |
| CONTROL VOLTAGE (Pin 5) | Input | Adjusts internal comparator thresholds; enables voltage-controlled timing or modulation |
| THRESHOLD (Pin 6) | Input | Monitors capacitor voltage; resets output when level exceeds 2/3 V+ |
| DISCHARGE (Pin 7) | Open-drain output | Internally connects to ground during discharge phase; used to bleed timing capacitor |
| V+ (Pin 8) | Power | Positive supply rail; accepts 1.5V–15V with no external regulation required |
Key Features
| Feature | Design Value |
|---|---|
| CMOS input stage | 10pA max trigger/threshold/reset current enables high-Z RC networks with <0.1% loading error |
| Low supply current spikes | Eliminates supply rail disturbance during output transitions-critical for mixed-signal systems |
| 1.5V minimum operating voltage | Supports single-cell alkaline/LiFePO₄ operation without boost converters |
| TTL/CMOS output compatibility | Direct interface with 3.3V/5V logic families without level-shifting circuitry |
| Pin-for-pin replacement | Drop-in upgrade for NE555/LM555 in existing SOIC-8 layouts-no PCB redesign needed |
Applications
| Precision Timing | Pulse Generation |
|---|---|
Use Scenario: Generating accurate time delays in data acquisition trigger circuits where jitter must remain below 100ns. IC Role / Device Role / Timing Role: Monostable one-shot generating fixed-duration gate pulses synchronized to analog signal edges. Use Value: 75ppm/°C timing drift and 100ns trigger propagation delay ensure sub-microsecond timing consistency across −40°C to 85°C. | Use Scenario: Creating variable-duty-cycle square waves for motor speed control in portable tools. IC Role / Device Role / Timing Role: Astable oscillator with externally adjustable RA/RB/C network setting frequency and duty cycle. Use Value: 3MHz max frequency and 0.3%/V supply rejection allow stable PWM generation even with battery voltage sag. |
| Time Delay Generation | Pulse Width Modulation |
Use Scenario: Implementing programmable power-on reset delays in microcontroller-based IoT edge nodes. IC Role / Device Role / Timing Role: Monostable timer triggered by power-rail monitor output to hold MCU in reset until supply stabilizes. Use Value: 1.5V operation and <250µA supply current enable reliable reset assertion from brown-out conditions down to 1.5V. | Use Scenario: Converting analog sensor signals into duty-cycle-modulated outputs for transmission over long cables. IC Role / Device Role / Timing Role: Monostable configured with modulating voltage applied to CONTROL VOLTAGE pin. Use Value: Linear control voltage-to-pulse-width response enables 0–100% duty cycle adjustment with <1% nonlinearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555P | Bipolar process; 10mA output drive but 3–6mA quiescent current at 5V; 4.5V min supply | Higher power, lower timing accuracy (±2% typical), less suitable for battery operation | Select when higher output current or legacy design reuse outweighs power/accuracy requirements |
| LMC555CMX/NOPB | Same die, commercial-temp (0°C to 70°C) grade; identical electrical specs and pinout | Not rated for extended industrial temperature range (−40°C to 125°C) | Select for cost-sensitive consumer applications where ambient temperature stays within 0–70°C |
Compared with NE555P, LMC555IMX/NOPB reduces supply current by >95% and extends supply range down to 1.5V, enabling ultra-low-power timing; compared with LMC555CMX/NOPB, it adds extended temperature qualification for harsher industrial deployments without sacrificing performance or footprint.
Availability
LMC555IMX/NOPB is available at Aetrix Electronics and suitable for precision timing, pulse generation, time delay generation, and pulse width modulation applications requiring stable component supply across automotive, industrial, and portable electronics programs.
Supply support for LMC555IMX/NOPB 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMC555IMX/NOPB belongs to TI's precision analog timer product line, engineered specifically to replace legacy bipolar 555 timers with CMOS efficiency while maintaining full functional and mechanical compatibility.
FAQ
What is the minimum supply voltage required for reliable operation of the LMC555IMX/NOPB?
The LMC555IMX/NOPB is specified to operate down to 1.5V across its full temperature range. At this voltage, supply current remains below 200µA typical, and timing accuracy is maintained within ±15% over −40°C to 125°C. This makes the LMC555IMX/NOPB uniquely suited for single-cell battery applications where other 555 variants fail to start or exhibit significant timing drift. The LMC555IMX/NOPB achieves this via TI's LMCMOS process, which lowers threshold voltages and leakage currents.
How does the LMC555IMX/NOPB differ from the standard NE555 in terms of power consumption?
The LMC555IMX/NOPB draws less than 250µA typical at 5V, versus 3–6mA for the NE555-a reduction exceeding 95%. This stems from its CMOS input and output stages, which eliminate base-drive currents and reduce supply current spikes during switching. As a result, the LMC555IMX/NOPB dissipates <1mW at 5V, enabling continuous operation in energy-harvesting and battery-backed systems where the NE555 would deplete power in hours. The LMC555IMX/NOPB maintains identical functionality and pinout despite this dramatic efficiency gain.
Can the LMC555IMX/NOPB be used as a direct replacement for an LM555 in an existing SOIC-8 PCB layout?
Yes, the LMC555IMX/NOPB is pin-for-pin compatible with the LM555, NE555, and SE555 in the SOIC-8 (D) package. All eight pins share identical functions, electrical tolerances, and drive strength specifications. No PCB modifications are required-only verification that the 1.5V–15V supply range aligns with system requirements. The LMC555IMX/NOPB's lower supply current and reduced noise coupling further improve system performance without altering layout. Engineers can deploy the LMC555IMX/NOPB as a drop-in upgrade to extend battery life or improve thermal behavior.
What is the maximum frequency achievable in astable mode using the LMC555IMX/NOPB?
The LMC555IMX/NOPB supports a maximum astable frequency of 3MHz at 5V supply, verified under standard test conditions with CL = 10pF. This is enabled by fast CMOS switching (15ns rise/fall times) and optimized internal propagation delays. At 12V, maximum frequency drops to 5.6kHz due to increased internal capacitance effects. For stable high-frequency operation, keep external timing resistors above 1kΩ and use low-ESR ceramic capacitors. The LMC555IMX/NOPB's 3MHz limit exceeds that of all standard bipolar 555 timers, making it suitable for ultrasonic driver and high-speed PWM applications.
Does the LMC555IMX/NOPB support modulation of output pulse width via the CONTROL VOLTAGE pin?
Yes, the LMC555IMX/NOPB's CONTROL VOLTAGE (Pin 5) allows real-time modulation of output pulse width in monostable mode or pulse position in astable mode. Applying an external voltage between 0.8V and 3.8V (at 5V supply) linearly adjusts the internal 1/3 and 2/3 V+ thresholds, thereby changing timing constants without altering external R/C components. This feature enables analog-to-PWM conversion, voltage-controlled oscillators, and feedback-stabilized timing loops. The LMC555IMX/NOPB's high-impedance CMOS input on this pin minimizes loading, preserving modulation signal integrity.
LMC555IMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 3MHz
- Voltage - Supply:
- 1.5V ~ 15V
- Current - Supply:
- 150 µA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LMC555IMX/NOPB FAQ
1.How can I place an order for LMC555IMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC555IMX/NOPB 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 LMC555IMX/NOPB reliable?
The price and inventory of LMC555IMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC555IMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMC555IMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC555IMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC555IMX/NOPB?
LMC555IMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC555IMX/NOPB 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 LMC555IMX/NOPB?
For technical support, including LMC555IMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC555IMX/NOPB requirements.
6.How does Aetrix verify that LMC555IMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC555IMX/NOPB 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 LMC555IMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMC555IMX/NOPB?
All LMC555IMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC555IMX/NOPB, 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 LMC555IMX/NOPB part is unused and in its original packaging.
Return procedure for LMC555IMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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