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Texas Instruments LM555CM/NOPB
- Part No.:
- LM555CM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM555CM/NOPB.pdf
- Description:
- IC OSC SGL TIMER 100KHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,729
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Product details
Overview
LM555CM/NOPB from Texas Instruments is a general-purpose bipolar 555 timer IC operating in astable or monostable mode, featuring ±500 V HBM ESD rating, 0–70°C operating temperature range, 4.5–16 V supply voltage, and TTL-compatible output capable of sourcing/sinking up to 200 mA. It delivers precise timing from microseconds to hours using external R-C networks and serves as a direct pin-to-pin replacement for NE555/SE555 in industrial control, pulse generation, and sequential timing circuits.
For engineers reviewing the LM555CM/NOPB datasheet, LM555CM/NOPB pinout, LM555CM/NOPB application, or LM555CM/NOPB equivalent, this page provides verified functional modes, confirmed SOIC-8 package mapping, validated timing accuracy (±1% initial monostable error), real-world output drive capability (200 mA sink/source), and documented thermal derating guidance for continuous operation.
Technical Context
The LM555CM/NOPB implements a dual-comparator architecture with an SR flip-flop and open-collector discharge transistor, enabling precise threshold (2/3 VCC) and trigger (1/3 VCC) detection. Its internal voltage reference (VREF = 2/3 VCC) ensures supply-independent timing intervals in both monostable (t = 1.1 × RA × C) and astable (f = 1.44 / [(RA + 2RB) × C]) configurations.
Timing stability is maintained via temperature coefficient better than 0.005%/°C and supply drift of ≤0.1%/V in monostable mode. The control voltage pin (Pin 5) allows external modulation of threshold/trigger levels, while reset (Pin 4) enables asynchronous disable with <1 μs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 16 V - supports standard 5 V and 12 V logic rails without level-shifting |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and instrumentation |
| Output Drive | 200 mA sink/source - directly drives LEDs, relays, and TTL inputs without external buffers |
| Timing Accuracy | ±1% initial monostable error - enables reliable one-shot delays without calibration |
| ESD Rating | ±500 V HBM - meets basic handling requirements for assembly environments |
| Package | SOIC-8 (D) - 4.90 mm × 3.91 mm footprint compatible with automated PCB assembly |
| Control Pin Voltage | 2.6–11 V at VCC = 5–15 V - permits external PWM modulation of output duty cycle |
Pinout & Package
LM555CM/NOPB is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 4.90 mm × 3.91 mm body size, and gull-wing leads suitable for reflow soldering per Level-1 MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for all internal circuitry and external timing components |
| 2 (TRIGGER) | Input comparator | Falling edge below 1/3 VCC sets flip-flop, initiating monostable timing or astable cycle |
| 3 (OUTPUT) | Push-pull driver | Active-high/low output stage capable of 200 mA sink/source into resistive loads |
| 4 (RESET) | Asynchronous control | Negative pulse disables timer output regardless of trigger/threshold state |
| 5 (CONTROL VOLTAGE) | Reference bias input | Externally adjusts internal comparators' thresholds for variable-duty-cycle oscillation |
| 6 (THRESHOLD) | Input comparator | Rising edge above 2/3 VCC resets flip-flop, ending monostable pulse or discharging capacitor |
| 7 (DISCHARGE) | Open-collector switch | Connects to external capacitor during timing interval discharge phase in astable mode |
| 8 (V+) | Power supply | Primary DC input; bypassing with 0.1 µF ceramic + 1 µF electrolytic required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Direct NE555/SE555 replacement | Pin-to-pin compatible with legacy 555 timers-no schematic or layout changes required |
| Microsecond-to-hour timing range | Supports RC time constants from ~1 µs to >1 hour using standard resistor/capacitor values |
| Astable & monostable operation | Single device configures as oscillator (free-running) or one-shot (triggered) via external wiring |
| TTL-compatible output | Drives standard 74LS/74HC logic inputs directly without interface circuitry |
| Adjustable duty cycle | Independent control of charge/discharge paths via RA/RB resistors enables 55%–95% duty cycles |
Applications
| Precision Timing | Pulse Generation |
|---|---|
Use Scenario: Industrial PLC timing module requiring repeatable 2.5 s on-delay for motor starter interlock. IC Role / Device Role / Timing Role: Monostable one-shot generating fixed-duration enable pulse upon sensor activation. Use Value: ±1% initial timing accuracy and <0.005%/°C drift ensure consistent relay actuation across ambient temperature shifts. | Use Scenario: LED flasher circuit in battery-powered signage with adjustable blink rate and brightness. IC Role / Device Role / Timing Role: Astable oscillator controlling LED current via PWM-modulated output. Use Value: 200 mA output drive eliminates need for external MOSFET, reducing BOM count and board space. |
| Sequential Timing | Time Delay Generation |
Use Scenario: Multi-stage chemical reactor controller sequencing valve actuation with 10 s, 30 s, and 60 s intervals. IC Role / Device Role / Timing Role: Cascaded monostable timers triggering downstream stages via output-to-trigger connections. Use Value: Independent RC networks per stage allow precise, non-interacting delay tuning without microcontroller firmware. | Use Scenario: Power-on reset circuit delaying microcontroller initialization until 100 ms after supply stabilization. IC Role / Device Role / Timing Role: Monostable configured with RC network to generate clean, glitch-free reset pulse. Use Value: Reset pin (Pin 4) provides hardware override capability if system watchdog detects fault condition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555P | Same bipolar process, identical pinout, but rated for 0°C to 70°C with ±2.25% astable timing error vs. LM555CM/NOPB's ±2.25% (typical) | Legacy through-hole design; lacks TI's enhanced ESD protection (±500 V HBM) | Select when PDIP-8 mounting is required and cost sensitivity outweighs SOIC-8 assembly efficiency |
| LMC555CMX/NOPB | CMOS version with 2 V to 15 V supply, 100 µA quiescent current, and rail-to-rail output-but not pin-compatible due to different DISCHARGE/THRESHOLD pin assignments | Ultra-low-power battery applications where 200 mA drive is unnecessary | Select only when redesigning for power optimization; requires full schematic and layout revision |
Compared with NE555P and LMC555CMX/NOPB, LM555CM/NOPB offers superior thermal stability (0.005%/°C vs. 0.01%/°C), higher output drive (200 mA vs. 200 mA for NE555P, 10 mA for LMC555), and guaranteed SOIC-8 manufacturability-making it optimal for new commercial designs needing proven reliability and drop-in compatibility.
Availability
LM555CM/NOPB is available at Aetrix Electronics and suitable for precision timing, pulse generation, sequential timing, and time delay generation applications requiring stable component supply across industrial control, instrumentation, and consumer electronics programs.
Supply support for LM555CM/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 leader delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and broad portfolio coverage.
The LM555 product line was designed for robust, low-cost timing functions in commercial-grade systems-emphasizing pin compatibility, wide supply range, and field-proven reliability in high-volume manufacturing.
FAQ
What is the maximum output current capability of the LM555CM/NOPB?
The LM555CM/NOPB can source or sink up to 200 mA at the OUTPUT pin (Pin 3) under specified conditions: VCC = 15 V, ISINK = 200 mA yields ≤2.5 V drop; ISOURCE = 200 mA yields ≥12.5 V output. This capability allows direct driving of LEDs, small relays, and TTL logic without external transistors-verified in TI's SNAS548D datasheet Section 6.5.
Does the LM555CM/NOPB support both astable and monostable operation?
Yes, the LM555CM/NOPB supports both astable (free-running oscillator) and monostable (one-shot) modes using external resistor-capacitor networks. In monostable mode, timing is set by t = 1.1 × RA × C; in astable mode, frequency is f = 1.44 / [(RA + 2RB) × C]. These configurations are fully documented in Sections 7.3.3 and 7.4 of the LM555CM/NOPB datasheet.
What package type is used for the LM555CM/NOPB?
The LM555CM/NOPB uses an 8-pin SOIC (Small Outline Integrated Circuit) package designated as 'D' in TI documentation, with nominal dimensions of 4.90 mm × 3.91 mm and 1.27 mm lead pitch. It is RoHS-compliant, rated MSL Level-1, and supplied in tubes of 95 units-confirmed in TI's PACKAGE OPTION ADDENDUM dated 10-Nov-2025.
Can the LM555CM/NOPB replace NE555 components in existing designs?
Yes, the LM555CM/NOPB is explicitly designed as a direct pin-to-pin replacement for NE555 and SE555 timers. TI confirms identical pinout, electrical characteristics, and functional behavior-requiring no schematic or PCB layout changes. This compatibility is stated in Section 7.3.1 of the LM555CM/NOPB datasheet and validated across SOIC-8, PDIP-8, and VSSOP-8 variants.
What is the recommended power supply bypassing for the LM555CM/NOPB?
TI recommends placing a 0.1 µF ceramic capacitor in parallel with a 1 µF electrolytic capacitor between V+ (Pin 8) and GND (Pin 1), located as close as possible to the LM555CM/NOPB package. This configuration suppresses supply noise and prevents oscillation-detailed in Section 9 (Power Supply Recommendations) and Section 10.1 (Layout Guidelines) of the LM555CM/NOPB datasheet.
LM555CM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 100kHz
- Voltage - Supply:
- 4.5V ~ 16V
- Current - Supply:
- 10 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LM555CM/NOPB FAQ
1.How can I place an order for LM555CM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM555CM/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 LM555CM/NOPB reliable?
The price and inventory of LM555CM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM555CM/NOPB is usually 5 days.
3.What payment methods are accepted for LM555CM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM555CM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM555CM/NOPB?
LM555CM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM555CM/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 LM555CM/NOPB?
For technical support, including LM555CM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM555CM/NOPB requirements.
6.How does Aetrix verify that LM555CM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM555CM/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 LM555CM/NOPB meets industry standards.
7.What is the process for return or replacement of LM555CM/NOPB?
All LM555CM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM555CM/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 LM555CM/NOPB part is unused and in its original packaging.
Return procedure for LM555CM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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