SA555D Equivalent & Substitute Parts

Part Overview

The SA555D is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 100kHz in an 8-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring timer and oscillator functionality within the specified electrical and mechanical parameters.

Substiute Parts

SA555D

Texas InstrumentsIn Stock: 10227SA555D Datasheet

Current PartRFQ

SA555DR

Texas InstrumentsIn Stock: 125144SA555DR Datasheet

MFR RecommendedRFQ

LM555CM/NOPB

Texas InstrumentsIn Stock: 2079LM555CM/NOPB Datasheet

MFR RecommendedRFQ

LM555CMX/NOPB

Texas InstrumentsIn Stock: 77198LM555CMX/NOPB Datasheet

MFR RecommendedRFQ

LMC555CM/NOPB

Texas InstrumentsIn Stock: 15161LMC555CM/NOPB Datasheet

MFR RecommendedRFQ

LMC555CMX/NOPB

Texas InstrumentsIn Stock: 31858LMC555CMX/NOPB Datasheet

MFR RecommendedRFQ

NCV1455BDR2G

onsemiIn Stock: 55207NCV1455BDR2G Datasheet

UpgradeRFQ

MC1455BDR2G

onsemiIn Stock: 3298MC1455BDR2G Datasheet

MFR RecommendedRFQ

MC1455DR2G

onsemiIn Stock: 25363MC1455DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA555D are classified based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Type: 555 Type, Timer/Oscillator (Single)
• Voltage - Supply: 4.5V ~ 16V minimum compatibility
• Current - Supply: 10 mA maximum requirement
• RoHS Status: ROHS3 Compliant

Grouping Logic:

Group 1 - Texas Instruments Direct Equivalents (100kHz Operation): SA555DR and LM555CM/NOPB maintain identical frequency (100kHz) and operating temperature range (-40°C ~ 85°C), ensuring drop-in compatibility for existing designs.

Group 2 - Texas Instruments Extended Frequency Parts (3MHz Operation): LMC555CM/NOPB and LMC555CMX/NOPB operate at 3MHz with extended supply voltage range (1.5V ~ 15V) and reduced supply current (150 µA). These parts are suitable only for applications where higher frequency operation is acceptable and lower power consumption is beneficial.

Group 3 - onsemi Equivalents: MC1455BDR2G, MC1455DR2G, and NCV1455BDR2G provide 555 Type timer functionality with identical voltage and current specifications. NCV1455BDR2G extends operating temperature to -40°C ~ 125°C, offering enhanced thermal performance.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitute: SA555DR

SA555DR is the direct equivalent to SA555D, manufactured by Texas Instruments with Active product status. It maintains identical electrical specifications (100kHz, 4.5V ~ 16V, 10 mA, -40°C ~ 85°C) and package configuration. With 125,100 units in stock, SA555DR provides immediate supply availability and eliminates design re-qualification requirements.

Secondary Substitute: LM555CM/NOPB or LM555CMX/NOPB

These Texas Instruments parts maintain 100kHz operation and identical voltage/current specifications. Operating temperature range is reduced to 0°C ~ 70°C, suitable for commercial and industrial applications not requiring extended low-temperature performance. LM555CMX/NOPB offers higher inventory (77,170 units) in Cut Tape & Digi-Reel packaging.

Alternative Substitute: NCV1455BDR2G

onsemi's NCV1455BDR2G provides 555 Type timer functionality with identical electrical specifications and extended operating temperature range (-40°C ~ 125°C). This part is suitable for applications requiring enhanced thermal performance beyond the original -40°C ~ 85°C range. All parts maintain ROHS3 compliance and identical package configuration.

Not Recommended for Direct Substitution: LMC555CM/NOPB and LMC555CMX/NOPB

While these parts share the 8-SOIC package and ROHS3 compliance, they operate at 3MHz with reduced supply current (150 µA) and extended supply voltage range (1.5V ~ 15V). These specifications represent a different functional class and require design re-evaluation for frequency-dependent applications.

Frequently Asked Questions (FAQ)

Q: Can SA555DR be used as a direct replacement for SA555D?

A: Yes. SA555DR is manufactured by Texas Instruments with identical electrical specifications (100kHz frequency, 4.5V ~ 16V supply voltage, 10 mA supply current, -40°C ~ 85°C operating temperature) and 8-SOIC package configuration. The only difference is product status (Active vs. Last Time Buy) and packaging format (Cut Tape & Digi-Reel vs. Tube).

Q: What is the difference between LM555CM/NOPB and LM555CMX/NOPB?

A: Both parts maintain identical electrical specifications and 100kHz operation. The primary difference is packaging format: LM555CM/NOPB is supplied in Tube packaging, while LM555CMX/NOPB is supplied in Cut Tape & Digi-Reel format. LM555CMX/NOPB has higher inventory availability (77,170 units vs. 2,027 units).

Q: Why are LMC555CM/NOPB and LMC555CMX/NOPB listed as substitutes if they operate at 3MHz instead of 100kHz?

A: These parts are listed as cross-references due to shared 555 Type timer architecture and 8-SOIC package compatibility. However, the 3MHz frequency specification represents a different functional class. Substitution requires design re-evaluation to confirm that higher frequency operation is acceptable for the target application.

Q: Can onsemi MC1455 series parts replace the SA555D?

A: MC1455BDR2G and MC1455DR2G are compatible substitutes with identical voltage (4.5V ~ 16V) and current (10 mA) specifications and 8-SOIC package. MC1455BDR2G maintains the full -40°C ~ 85°C operating temperature range. MC1455DR2G is limited to 0°C ~ 70°C. Frequency specifications are not provided for these parts; confirmation with onsemi datasheets is necessary for frequency-critical applications.

Q: What is the advantage of NCV1455BDR2G over other substitutes?

A: NCV1455BDR2G extends the operating temperature range to -40°C ~ 125°C, providing enhanced thermal performance for high-temperature applications. It maintains identical voltage (4.5V ~ 16V) and current (10 mA) specifications with 8-SOIC package compatibility and Active product status.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL 1 - Unlimited), ensuring compatibility with standard PCB assembly processes and environmental regulations.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (SA555D, LM555CM/NOPB, LMC555CM/NOPB), Cut Tape & Digi-Reel (SA555DR, LM555CMX/NOPB, MC1455BDR2G, MC1455DR2G, NCV1455BDR2G), and Tape & Reel (LMC555CMX/NOPB). Selection depends on production volume and assembly line requirements.