NE555DX Equivalent & Substitute Parts

Part Overview

The NE555DX is a 555 Type Timer/Oscillator (Single) IC manufactured by onsemi in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The NE555DX operates within a supply voltage range of 4.5V to 16V with a maximum supply current of 7.5 mA and an operating temperature range of 0°C to 70°C. Identifying compatible substitutes ensures design continuity and maintains system functionality when the original part becomes unavailable.

Key Parameters

Parameter	NE555DX Specification
Manufacturer	onsemi
Part Number	NE555DX
Category	Clock/Timing
Type	555 Type, Timer/Oscillator (Single)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	4.5V ~ 16V
Current - Supply	7.5 mA
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the NE555DX is determined by the following critical parameters:

Electrical Compatibility:

Voltage Supply Range: 4.5V ~ 16V (must match or exceed the original specification)
Current Supply: Maximum allowable current consumption
Operating Temperature Range: Must support the required operating conditions

Mechanical Compatibility:

Package Type: 8-SOIC (0.154", 3.90mm Width) - identical footprint required for direct PCB replacement
Mounting Type: Surface Mount - consistent with original design

Functional Compatibility:

Device Type: 555 Type, Timer/Oscillator (Single) - functional equivalence in timing circuit applications

Substitute parts are grouped into three categories based on their relationship to the NE555DX:

Similar Parts (MC1455 Series): Active status parts with identical package and voltage specifications but different current ratings and temperature ranges
Direct Equivalents (NE555S-13, NA555D, NA555DR): Parts sharing the NE555 base product number or direct functional equivalence with enhanced specifications
Upgrade Options (SA555 Series, LM555CM/NOPB): Parts offering extended temperature ranges, higher frequency ratings, or improved availability with active product status

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Frequency
NE555DX	onsemi	Obsolete	4.5V ~ 16V	7.5 mA	0°C ~ 70°C	8-SOIC (0.154", 3.90mm Width)	—
MC1455BDR2G	onsemi	Active	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm Width)	—
MC1455DR2G	onsemi	Active	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC (0.154", 3.90mm Width)	—
NE555S-13	Diodes Incorporated	Active	4.5V ~ 16V	13 mA	0°C ~ 70°C	8-SOIC (0.154", 3.90mm Width)	500kHz
NA555D	Texas Instruments	Last Time Buy	4.5V ~ 16V	10 mA	-40°C ~ 105°C	8-SOIC (0.154", 3.90mm Width)	100kHz
NA555DR	Texas Instruments	Active	4.5V ~ 16V	10 mA	-40°C ~ 105°C	8-SOIC (0.154", 3.90mm Width)	100kHz
NA555S-13	Diodes Incorporated	Active	4.5V ~ 16V	13 mA	-40°C ~ 105°C	8-SOIC (0.154", 3.90mm Width)	500kHz
SA555D	Fairchild Semiconductor	Obsolete	4.5V ~ 16V	10 mA	-40°C ~ 105°C	8-SOIC (0.154", 3.90mm Width)	500kHz
SA555DR	Texas Instruments	Active	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm Width)	100kHz
SA555DRG4	Texas Instruments	Obsolete	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm Width)	100kHz
LM555CM/NOPB	Texas Instruments	Active	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC (0.154", 3.90mm Width)	100kHz

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Conditions):

MC1455DR2G is the primary substitute when the original 0°C to 70°C operating temperature range must be maintained. This part is manufactured by onsemi with active product status, ensuring long-term availability. The identical package footprint (8-SOIC) and voltage specification (4.5V ~ 16V) enable direct PCB substitution. The 10 mA supply current specification exceeds the NE555DX requirement of 7.5 mA, confirming compatibility within the design envelope.

For Extended Temperature Range Applications:

NA555DR and SA555DR offer extended operating temperature ranges (-40°C to 105°C and -40°C to 85°C respectively) while maintaining active product status. Both parts are manufactured by Texas Instruments with identical package specifications. These options are suitable when designs require operation beyond the original 0°C to 70°C specification.

For High-Frequency Applications:

NE555S-13 and NA555S-13 provide 500kHz frequency specifications compared to the unspecified frequency of the NE555DX. Both maintain the 4.5V ~ 16V voltage specification and 8-SOIC package. NA555S-13 offers extended temperature range (-40°C to 105°C) with active product status.

Compliance and Availability:

All recommended substitutes maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity classification, consistent with the original part. Parts with Active product status (MC1455DR2G, NA555DR, SA555DR, LM555CM/NOPB, NE555S-13, NA555S-13) are preferred for new designs and long-term procurement security.

Frequently Asked Questions (FAQ)

Q: Can MC1455DR2G be used as a direct replacement for NE555DX?

A: Yes. MC1455DR2G shares the identical 8-SOIC package footprint, 4.5V ~ 16V voltage specification, and 0°C ~ 70°C operating temperature range as the NE555DX. The 10 mA supply current specification exceeds the NE555DX requirement, confirming electrical compatibility. No PCB modifications are required.

Q: What is the difference between MC1455BDR2G and MC1455DR2G?

A: Both parts are manufactured by onsemi with identical electrical specifications (4.5V ~ 16V, 10 mA supply current, 8-SOIC package). The primary difference is operating temperature range: MC1455BDR2G operates from -40°C to 85°C, while MC1455DR2G operates from 0°C to 70°C. Select MC1455DR2G for applications matching the original NE555DX temperature specification.

Q: Why do some substitutes have higher current specifications than the NE555DX?

A: The NE555DX specifies 7.5 mA maximum supply current. Substitute parts with 10 mA or 13 mA specifications indicate higher current consumption capability. These parts remain compatible because the design requirement is that the substitute must not exceed the power supply's current capacity. Verify that the power supply can deliver the substitute part's maximum current.

Q: Are obsolete substitute parts acceptable for new designs?

A: Obsolete parts (SA555D, SA555DRG4) should not be selected for new designs due to limited availability and no guaranteed long-term supply. Prioritize parts with Active product status (MC1455DR2G, NA555DR, SA555DR, LM555CM/NOPB, NE555S-13, NA555S-13) to ensure design longevity and procurement reliability.

Q: What is the significance of the frequency specification in substitute parts?

A: The NE555DX does not specify a frequency rating. Substitute parts listing 100kHz or 500kHz indicate the maximum operating frequency in astable mode. These specifications do not restrict lower-frequency operation. Select based on your application's frequency requirements; higher frequency ratings provide design flexibility without affecting lower-frequency applications.

Q: Can NA555DR be used in applications requiring the 0°C to 70°C temperature range?

A: Yes. NA555DR operates from -40°C to 105°C, which encompasses the 0°C to 70°C range. The extended temperature specification provides additional design margin and is fully compatible with applications limited to 0°C to 70°C operation.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 Compliant status, consistent with the REACH Unaffected classification of the NE555DX. This ensures environmental compliance across all substitution options.

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