LM556CN/NOPBIn StockTexas Instruments
The LM556CN/NOPB is a dual timing IC from Texas Instruments, integrating two independent 555-compatible timer circuits. It supports monostable and astable modes with timing ranges from microseconds to hours. Available in DIP-14 package, in stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- LM556CN/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual independent 555-compatible timer circuits in a single DIP-14 package
- Wide supply voltage range supporting both monostable and astable operation
- High output current capability suitable for driving TTL and CMOS logic
- Timing range spans from microseconds to hours for versatile applications
- RoHS compliant (NOPB) JEDEC-standard plastic DIP package for easy through-hole assembly
Applications
The LM556CN/NOPB dual timer is widely used in precision timing circuits, pulse generation, and sequential timing applications. It is ideal for industrial control systems, consumer electronics, and alarm circuits where two independent timing channels are required in a compact footprint. Common designs include oscillator circuits, PWM signal generators, missing pulse detectors, and time-delay relays.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | PULSE; RECTANGULAR |
| JESD-30 Code | R-PDIP-T14 |
| JESD-609 Code | e3 |
| Number of Functions | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP14,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 16V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | MATTE TIN |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM556CN/NOPB:
NXP Semiconductors 2 Func, BIPolar, PDIP14
Frequently Asked Questions
What is the LM556CN/NOPB and how does it differ from the LM555?
The LM556CN/NOPB is a dual timer IC from Texas Instruments that integrates two independent 555-compatible timer circuits in a single 14-pin DIP package. Unlike the single LM555, the LM556 provides two fully independent timing channels, each capable of monostable (one-shot) or astable (oscillator) operation, saving board space in applications that need two timing functions.
What are the key electrical specifications of the LM556CN/NOPB?
The LM556CN/NOPB operates over a supply voltage range of 5V to 15V (compatible with TTL and CMOS), with timing accuracy typically within 1%. Each timer channel can source or sink up to 200mA of output current. It supports timing intervals from microseconds to hours determined by external RC components, and is rated for operation from 0°C to +70°C (commercial grade).
What are typical applications for the LM556CN/NOPB?
The LM556CN/NOPB is commonly used in sequential timing circuits, pulse-width modulation (PWM) generators, oscillators, time-delay relays, missing pulse detectors, and alarm systems. Its dual-channel design makes it especially useful in industrial control equipment, consumer electronics timers, and any design requiring two synchronized or independent timing functions in a compact DIP-14 footprint.
What does the NOPB suffix mean in LM556CN/NOPB?
The NOPB suffix stands for No Lead (Pb) and indicates that the LM556CN/NOPB is RoHS compliant, meaning it is manufactured without lead-based solder or finishes. This makes it suitable for environmentally compliant designs and mandatory for products sold in the European Union under the RoHS directive and for many other international markets with similar regulations.
Is the LM556CN/NOPB pin-compatible with other dual timer ICs?
Yes, the LM556CN/NOPB follows the standard LM556/NE556 pinout in a 14-pin DIP package, making it pin-compatible with industry-standard dual 555-type timers from other manufacturers such as the NE556N and MC1556. This allows direct drop-in replacement in existing designs without PCB modifications, simplifying sourcing and second-sourcing strategies.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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