SA555DRE4 Equivalent & Substitute Parts

Part Overview

The SA555DRE4 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 Obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production continuity. The SA555DRE4 operates across a supply voltage range of 4.5V to 16V with a maximum supply current of 10mA and an operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	SA555DRE4
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	555 Type, Timer/Oscillator (Single)
Frequency	100kHz
Voltage - Supply	4.5V ~ 16V
Current - Supply	10 mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SA555DRE4 are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalents share identical electrical specifications (100kHz frequency, 4.5V-16V supply voltage, 10mA supply current, -40°C to 85°C operating temperature) and the same 8-SOIC package. These parts are direct functional replacements with no design modifications required.

Manufacturer Recommended Substitutes from Texas Instruments maintain the same package and core 555 timer functionality but may operate at different frequency ratings (3MHz variants) or narrower temperature ranges (0°C to 70°C). These parts are suitable when the application does not require the full -40°C to 85°C temperature range or when higher frequency operation is acceptable.

Upgrade Alternatives from onsemi (NCV1455BDR2G, MC1455BDR2G, MC1455DR2G) provide extended operating temperature ranges (-40°C to 125°C for NCV1455BDR2G) or maintain standard ranges while offering active product status and improved long-term availability. These parts are functionally compatible 555-type timers in the same 8-SOIC package.

Key parameters determining substitution eligibility: Package type (8-SOIC), mounting method (Surface Mount), supply voltage range compatibility (minimum 4.5V, maximum 16V), and functional equivalence as 555-type timer ICs.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status	Inventory
SA555DRE4	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC	Obsolete	954 Pcs
SA555DR	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC	Active	125100 Pcs
SA555DRG4	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC	Obsolete	1308 Pcs
LM555CM/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	2027 Pcs
LM555CMX/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	77170 Pcs
LMC555CM/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	15128 Pcs
LMC555CMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Active	31756 Pcs
MC1455BDR2G	onsemi	—	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-SOIC	Active	3266 Pcs
MC1455DR2G	onsemi	—	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	25300 Pcs
NCV1455BDR2G	onsemi	—	4.5V ~ 16V	10 mA	-40°C ~ 125°C	8-SOIC	Active	55100 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): SA555DR is the primary recommendation as a parametric equivalent. It maintains 100% electrical compatibility with the SA555DRE4 (100kHz frequency, 4.5V-16V supply, 10mA current, -40°C to 85°C temperature range) while offering Active product status and significantly higher inventory availability (125,100 units). Both parts are ROHS3 compliant and carry identical compliance certifications.

For Active Product Status with Temperature Derating: LM555CMX/NOPB provides the highest inventory availability (77,170 units) among Texas Instruments alternatives with Active status. This part operates at 100kHz with matching supply specifications but operates within a narrower temperature range (0°C to 70°C). Selection of this part is appropriate when applications do not require extended low-temperature operation below 0°C.

For Extended Temperature Range Applications: NCV1455BDR2G from onsemi extends the operating temperature range to -40°C to 125°C, providing superior thermal performance for high-temperature environments. This part maintains 4.5V-16V supply voltage and 10mA current specifications with Active product status and strong inventory (55,100 units). ROHS3 compliance is maintained.

For Low-Power Applications: LMC555CMX/NOPB operates at 3MHz with significantly reduced supply current (150µA versus 10mA) and lower minimum supply voltage (1.5V). This part is suitable only when the application can tolerate higher frequency operation and does not require the full 4.5V minimum supply voltage of the original part.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status consistent with the SA555DRE4.

Frequently Asked Questions (FAQ)

Q: Can SA555DR be used as a direct replacement for SA555DRE4? A: Yes. SA555DR is a parametric equivalent with identical electrical specifications (100kHz, 4.5V-16V, 10mA, -40°C to 85°C) and the same 8-SOIC package. The only difference is product status (Active versus Obsolete) and packaging format. No circuit modifications are required.

Q: What is the difference between LM555CM/NOPB and LM555CMX/NOPB? A: Both parts are electrically identical (100kHz, 4.5V-16V, 10mA, 0°C to 70°C). The primary difference is packaging: LM555CM/NOPB is supplied in Tube packaging, while LM555CMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel format. LM555CMX/NOPB has significantly higher inventory availability (77,170 versus 2,027 units).

Q: Can LMC555CMX/NOPB replace SA555DRE4 in all applications? A: LMC555CMX/NOPB is not a direct replacement. While it maintains the -40°C to 85°C temperature range and 8-SOIC package, it operates at 3MHz (not 100kHz), has a lower minimum supply voltage (1.5V instead of 4.5V), and draws significantly less current (150µA instead of 10mA). Use this part only when the application can accommodate higher frequency operation and lower supply voltage requirements.

Q: Why does NCV1455BDR2G not specify a frequency rating? A: The frequency specification is not provided in the available data for NCV1455BDR2G. However, as a 555-type timer IC, it is functionally compatible with the SA555DRE4. The primary advantage of this part is its extended operating temperature range (-40°C to 125°C), making it suitable for high-temperature applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (SA555DR, LM555CM/NOPB, LM555CMX/NOPB, LMC555CM/NOPB, LMC555CMX/NOPB, MC1455BDR2G, MC1455DR2G, NCV1455BDR2G) are ROHS3 compliant with MSL Level 1 (Unlimited) and REACH Unaffected status, matching the compliance profile of the SA555DRE4.

Q: Which substitute offers the best long-term availability? A: LM555CMX/NOPB offers the highest inventory availability (77,170 units) with Active product status. SA555DR is the second option (125,100 units available). Both are suitable for long-term production planning.

Q: Can MC1455DR2G be used in applications requiring -40°C operation? A: No. MC1455DR2G operates within a 0°C to 70°C temperature range, which does not support the full -40°C to 85°C range of the SA555DRE4. Use MC1455BDR2G or NCV1455BDR2G from onsemi for applications requiring -40°C operation.

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