NE556D Equivalent & Substitute Parts

Part Overview

The NE556D is a dual timer/oscillator integrated circuit manufactured by Texas Instruments, designed for clock and timing applications with a maximum frequency of 100kHz. The device is housed in a 14-SOIC surface mount package and operates across a supply voltage range of 4.5V to 16V.

The NE556D is currently designated as Last Time Buy, indicating that the manufacturer has discontinued or will discontinue production. This status necessitates identifying functionally equivalent substitute components to ensure design continuity and procurement availability for new production runs and field replacements.

Substiute Parts

NE556D

Texas InstrumentsIn Stock: 1961NE556D Datasheet

Current PartRFQ

NE556DR

Texas InstrumentsIn Stock: 48114NE556DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NE556D is determined by strict equivalence across the following critical parameters:

• Device Type: 555 Type, Timer/Oscillator (Dual) architecture
• Frequency Rating: 100kHz maximum operating frequency
• Voltage Supply Range: 4.5V ~ 16V
• Current Supply: 20 mA
• Operating Temperature Range: 0°C ~ 70°C
• Package Configuration: 14-SOIC surface mount package with identical pin pitch and dimensions
• Electrical Characteristics: Identical functional performance and pin compatibility

The NE556DR qualifies as a direct substitute based on complete alignment with all electrical and mechanical parameters. The primary distinction is packaging format: the NE556D is supplied in Tube packaging, while the NE556DR is available in Cut Tape (CT) and Digi-Reel® (Tape & Reel) formats. Both variants share identical die specifications and performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The NE556DR is the manufacturer-recommended substitute for the NE556D. Both components are manufactured by Texas Instruments and maintain identical electrical specifications, functional performance, and physical package dimensions.

The NE556D is designated Last Time Buy, while the NE556DR maintains Active product status. For new designs and ongoing production requirements, the NE556DR should be selected to ensure long-term supply chain continuity.

Both parts comply with ROHS3 regulations and carry identical REACH and ECCN classifications, ensuring regulatory compliance across applications. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints for either component.

The substitution is electrically and mechanically transparent; no circuit modifications or PCB layout changes are required when transitioning from NE556D to NE556DR.

Frequently Asked Questions (FAQ)

Q: Can the NE556DR be used as a direct replacement for the NE556D in existing designs?

A: Yes. The NE556DR is electrically and mechanically identical to the NE556D. Pin configuration, electrical performance, and package dimensions are equivalent. No circuit or PCB modifications are necessary.

Q: What is the difference between the NE556D and NE556DR?

A: The primary difference is packaging format. The NE556D is supplied in Tube packaging, while the NE556DR is available in Cut Tape (CT) and Digi-Reel® (Tape & Reel) formats. The die and electrical specifications are identical.

Q: Why is the NE556D designated Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued or will discontinue production of this part number. The NE556DR, with Active status, is the recommended alternative for future procurement.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the NE556D and NE556DR carry identical RoHS3, REACH, and ECCN classifications. Regulatory compliance is maintained across both part numbers.

Q: What supply voltage range is supported by both parts?

A: Both the NE556D and NE556DR operate across a supply voltage range of 4.5V to 16V with a maximum supply current of 20 mA.

Q: Is the 14-SOIC package identical for both parts?

A: Yes. Both parts use the 14-SOIC package with dimensions of 0.154" width (3.90mm). Pin pitch and physical footprint are identical, ensuring direct PCB compatibility.