NA555D Equivalent & Substitute Parts

Part Overview

The NA555D is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 100kHz with an 8-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts is necessary to ensure design continuity and long-term supply chain reliability for applications requiring timer and oscillator functionality.

Substiute Parts

NA555D

Texas InstrumentsIn Stock: 1521NA555D Datasheet

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NA555DR

Texas InstrumentsIn Stock: 43906NA555DR Datasheet

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LM555CM/NOPB

Texas InstrumentsIn Stock: 2079LM555CM/NOPB Datasheet

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LM555CMX/NOPB

Texas InstrumentsIn Stock: 77198LM555CMX/NOPB Datasheet

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LMC555CM/NOPB

Texas InstrumentsIn Stock: 15161LMC555CM/NOPB Datasheet

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LMC555CMX/NOPB

Texas InstrumentsIn Stock: 31858LMC555CMX/NOPB Datasheet

MFR RecommendedRFQ

NCV1455BDR2G

onsemiIn Stock: 55207NCV1455BDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the NA555D is determined by the following critical parameters:

• Package Compatibility: 8-SOIC form factor (0.154", 3.90mm Width) with surface mount capability
• Functional Type: 555 Type Timer/Oscillator (Single) architecture
• Electrical Specifications: Supply voltage range 4.5V ~ 16V and supply current 10 mA
• Operating Temperature Range: Extended range -40°C ~ 105°C preferred for industrial applications
• Compliance: ROHS3 compliance and EAR99 classification

Substitute parts are grouped into two categories:

Direct Substitutes (100kHz Operation): NA555DR and LM555CM/NOPB maintain the 100kHz frequency specification and are pin-compatible replacements.

Extended Frequency Substitutes (3MHz Operation): LMC555CM/NOPB and LMC555CMX/NOPB operate at 3MHz with enhanced performance characteristics, suitable for applications requiring higher frequency operation.

Upgraded Alternative: NCV1455BDR2G from onsemi provides extended operating temperature range (-40°C ~ 125°C) with identical electrical and package specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: NA555DR is the preferred direct substitute. It maintains identical electrical specifications and operating temperature range as the NA555D while offering Active product status with superior inventory availability (43,850 pcs). The transition from Tube to Cut Tape & Digi-Reel packaging accommodates standard manufacturing processes.

Temperature-Constrained Applications: For designs operating within 0°C ~ 70°C, LM555CM/NOPB and LM555CMX/NOPB are viable alternatives with Active status. LM555CMX/NOPB is recommended for high-volume production due to Tape & Reel packaging and higher inventory levels (77,170 pcs).

Extended Temperature Range: NCV1455BDR2G from onsemi provides the widest operating temperature range (-40°C ~ 125°C), suitable for industrial and automotive applications requiring enhanced thermal performance. All electrical and package specifications align with the NA555D.

Higher Frequency Applications: LMC555CM/NOPB and LMC555CMX/NOPB operate at 3MHz with reduced supply current (150 µA), enabling higher-speed timing applications. LMC555CMX/NOPB is preferred for production due to Active status and Tape & Reel availability.

All recommended substitutes maintain ROHS3 compliance, EAR99 classification, and MSL Level 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can NA555DR be used as a direct replacement for NA555D? A: Yes. NA555DR is a direct substitute with identical electrical specifications (100kHz, 4.5V ~ 16V supply, 10 mA current, -40°C ~ 105°C operating range) and 8-SOIC package. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube) and Active product status.

Q: What is the difference between LM555CM/NOPB and LM555CMX/NOPB? A: Both parts are electrically identical 100kHz timer ICs with 8-SOIC packages. The primary difference is packaging: LM555CM/NOPB uses Tube packaging, while LM555CMX/NOPB uses Cut Tape & Digi-Reel. LM555CMX/NOPB has higher inventory availability and is preferred for production environments.

Q: Why does LM555CM/NOPB have a narrower operating temperature range (0°C ~ 70°C) compared to NA555D (-40°C ~ 105°C)? A: LM555CM/NOPB is specified for commercial temperature range, while NA555D is specified for industrial temperature range. Selection depends on application requirements. For extended temperature operation, use NA555DR or NCV1455BDR2G.

Q: What are the advantages of LMC555CM/NOPB over NA555D? A: LMC555CM/NOPB operates at 3MHz (vs. 100kHz), has lower supply current (150 µA vs. 10 mA), and supports lower supply voltage (1.5V minimum vs. 4.5V). These characteristics suit low-power, high-frequency timing applications. Operating temperature range is -40°C ~ 85°C.

Q: Is NCV1455BDR2G compatible with NA555D designs? A: Yes. NCV1455BDR2G maintains the same 8-SOIC package, 4.5V ~ 16V supply range, and 10 mA supply current as NA555D. The primary advantage is extended operating temperature range (-40°C ~ 125°C), making it suitable for harsh industrial and automotive environments.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (NA555DR, LM555CM/NOPB, LM555CMX/NOPB, LMC555CM/NOPB, LMC555CMX/NOPB, and NCV1455BDR2G) are ROHS3 compliant with MSL Level 1 moisture sensitivity rating.

Q: Which substitute offers the best long-term availability? A: NA555DR and LM555CMX/NOPB both have Active product status with high inventory levels (43,850 pcs and 77,170 pcs respectively), ensuring long-term supply chain stability. LMC555CMX/NOPB also has Active status with 31,756 pcs available.