SE555D Equivalent & Substitute Parts

Part Overview

The SE555D is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 100kHz with an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating limited future availability. The SE555D is designed for clock and timing applications requiring stable oscillation in the 100kHz frequency range with supply voltage tolerance from 4.5V to 18V.

Finding equivalent and substitute parts is necessary due to the Last Time Buy status, which signals discontinuation. Alternative parts with matching or compatible electrical and mechanical specifications ensure design continuity and long-term supply chain reliability.

Key Parameters

Parameter	SE555D Value
Manufacturer	Texas Instruments
Type	555 Type, Timer/Oscillator (Single)
Frequency	100kHz
Voltage - Supply	4.5V ~ 18V
Current - Supply	10 mA
Operating Temperature	-55°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the SE555D is determined by the following critical parameters:

Primary Compatibility Criteria:

Package type: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting type: Surface Mount
Device type: 555 Type Timer/Oscillator (Single)
Frequency range: 100kHz operation capability
Supply voltage range: Minimum 4.5V to 18V tolerance
Current consumption: 10 mA nominal
Operating temperature range: -55°C to 125°C

Substitute parts are grouped into two categories:

MFR Recommended Substitutes: Parts with identical or superior electrical specifications and Active product status, ensuring immediate availability and long-term support.

Parametric Equivalents: Parts with matching core functionality and package but with variations in frequency, temperature range, or supply voltage specifications that may require application verification.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status
SE555D	Texas Instruments	100kHz	4.5V ~ 18V	10 mA	-55°C ~ 125°C	8-SOIC	Last Time Buy
SE555DR	Texas Instruments	100kHz	4.5V ~ 18V	10 mA	-55°C ~ 125°C	8-SOIC	Active
LM555CM/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active
LM555CMX/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active
LMC555CM/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy
LMC555CMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Active
NCV1455BDR2G	onsemi	Not specified	4.5V ~ 16V	10 mA	-40°C ~ 125°C	8-SOIC	Active
SE555DG4	Texas Instruments	100kHz	4.5V ~ 18V	10 mA	-55°C ~ 125°C	8-SOIC	Obsolete

Engineering Selection Recommendations

Primary Recommendation: SE555DR

SE555DR is the manufacturer-recommended direct substitute for SE555D. It maintains identical electrical specifications (100kHz frequency, 4.5V to 18V supply voltage, 10 mA current, -55°C to 125°C operating range) and 8-SOIC packaging. SE555DR holds Active product status with 205,400 units in stock, ensuring reliable long-term availability. Both parts are ROHS3 compliant and carry identical compliance certifications (REACH Unaffected, EAR99 ECCN).

Secondary Recommendations: LM555CM/NOPB and LM555CMX/NOPB

These Texas Instruments parts maintain 100kHz frequency and 10 mA current specifications with 8-SOIC packaging. Both are Active status products. The trade-off is reduced supply voltage range (4.5V to 16V versus 4.5V to 18V) and narrower operating temperature range (0°C to 70°C versus -55°C to 125°C). These substitutes are suitable for applications not requiring extended temperature operation or the full 18V supply voltage capability.

Alternative: LMC555CMX/NOPB

LMC555CMX/NOPB is an Active status alternative offering superior frequency capability (3MHz) and lower power consumption (150 µA versus 10 mA). This part is suitable for applications requiring higher frequency operation or battery-powered designs. The reduced supply voltage range (1.5V to 15V) and operating temperature range (-40°C to 85°C) must be verified against application requirements.

Cross-Manufacturer Option: NCV1455BDR2G

NCV1455BDR2G from onsemi provides 555 Type functionality in 8-SOIC packaging with 4.5V to 16V supply voltage and 10 mA current. This part is Active status with extended temperature range (-40°C to 125°C). Frequency specification is not provided; verification against application requirements is necessary before selection.

Not Recommended: SE555DG4

SE555DG4 is classified as Obsolete and should not be selected for new designs or long-term supply planning, despite matching electrical specifications to SE555D.

Frequently Asked Questions (FAQ)

Q: Can SE555DR be used as a direct replacement for SE555D?

A: Yes. SE555DR is the manufacturer-recommended substitute with identical electrical specifications, package type, and compliance certifications. The only difference is product status: SE555DR is Active while SE555D is Last Time Buy.

Q: What is the key difference between LM555CM/NOPB and SE555DR?

A: Both operate at 100kHz with 10 mA current consumption in 8-SOIC packages. The differences are: (1) LM555CM/NOPB has reduced supply voltage range (4.5V to 16V versus 4.5V to 18V), and (2) narrower operating temperature range (0°C to 70°C versus -55°C to 125°C). Select SE555DR if your application requires the full voltage and temperature specifications.

Q: Is LMC555CM/NOPB compatible with SE555D applications?

A: LMC555CM/NOPB is a 555 Type device in the same 8-SOIC package but operates at 3MHz frequency with 150 µA current consumption. It is not a direct substitute for 100kHz applications. Use only if your design can accommodate higher frequency operation and lower power consumption.

Q: Can I use NCV1455BDR2G from onsemi instead of Texas Instruments parts?

A: NCV1455BDR2G is a 555 Type timer in 8-SOIC packaging with compatible supply voltage (4.5V to 16V) and current (10 mA). However, frequency specification is not provided. Verify frequency compatibility with your application before selection.

Q: What packaging options are available for SE555D substitutes?

A: All listed substitutes use the 8-SOIC (0.154", 3.90mm Width) surface mount package, matching SE555D. Packaging variations exist only in distribution format: Tube, Cut Tape & Digi-Reel, or Tape & Reel. These do not affect electrical or mechanical compatibility.

Q: Why is SE555DG4 listed if it is Obsolete?

A: SE555DG4 is included for reference as a parametric equivalent with identical specifications to SE555D. However, Obsolete status makes it unsuitable for new designs or long-term supply planning. Use Active status alternatives instead.

Q: Which substitute offers the lowest power consumption?

A: LMC555CMX/NOPB consumes 150 µA compared to 10 mA for SE555D and other standard 555 substitutes. Select this part only if your application requires higher frequency (3MHz) operation and can tolerate the reduced supply voltage range (1.5V to 15V) and operating temperature range (-40°C to 85°C).

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