ICM7555CD,623 Equivalent & Substitute Parts

Part Overview

The ICM7555CD,623 is a 555 Type Timer/Oscillator (Single) IC manufactured by NXP Semiconductors, operating at 500kHz with a supply voltage range of 3V to 16V. This component is packaged in 8-SOIC surface mount configuration and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production runs and system maintenance.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICM7555CD,623
Manufacturer	NXP Semiconductors
Product Category	Clock/Timing - 555 Type Timer/Oscillator (Single)
Frequency	500kHz
Voltage - Supply	3V ~ 16V
Current - Supply	180 µA
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ICM7555CD,623 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility without redesign.

Functional Type: All substitutes must be 555 Type Timer/Oscillator (Single) ICs to maintain functional equivalence in circuit operation.

Voltage Supply Range: The substitute must operate within or encompass the original 3V to 16V supply range. Substitutes with wider voltage ranges (2V minimum) remain compatible as they cover the original operating window.

Frequency Capability: The original part operates at 500kHz. Substitutes with equal or higher frequency ratings (500kHz and above) are functionally compatible, as they can operate at the original frequency without performance degradation.

Compliance & Certification: All substitutes must maintain ROHS3 compliance and MSL 1 rating to ensure regulatory and environmental compatibility.

Product Status: Active status substitutes ensure ongoing availability and manufacturing support, eliminating obsolescence risk.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status
ICM7555CD,623	NXP Semiconductors	500kHz	3V ~ 16V	180 µA	0°C ~ 70°C	8-SOIC	Obsolete
TLC555CDR	Texas Instruments	2.1MHz	2V ~ 15V	360 µA	0°C ~ 70°C	8-SOIC	Active
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 µA	0°C ~ 70°C	8-SOIC	Active
ICM7555CBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	8-SOIC	Active
ICM7555CBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	8-SOIC	Active
ICM7555ESA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active
ICM7555ESA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active
ICM7555IBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	8-SOIC	Active
ICM7555IBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	8-SOIC	Active
ICM7555ISA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	8-SOIC	Active
ICM7555ISA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Frequency Match (500kHz): The ICM7555ESA+, ICM7555ESA+T, ICM7555ISA+, and ICM7555ISA+T from Analog Devices Inc./Maxim Integrated provide exact frequency matching at 500kHz. These parts are active products with extended operating temperature ranges (-40°C to 85°C or -20°C to 85°C) compared to the original specification, offering improved reliability margins. Supply current is significantly lower at 30 µA versus 180 µA in the original part.

Higher Frequency Capability: The ICM7555CBAZ, ICM7555CBAZ-T, ICM7555IBAZ, and ICM7555IBAZ-T from Renesas Electronics Corporation operate at 1MHz, providing 2x frequency headroom. These parts support the original 500kHz operation with margin and feature wider voltage ranges (2V to 18V). The IBAZ variants offer extended temperature operation (-25°C to 85°C).

Premium Performance Option: The TLC555CDR from Texas Instruments operates at 2.1MHz with LinCMOS™ series designation, providing maximum frequency capability. The ALD7555SAL from Advanced Linear Devices Inc. offers the lowest supply current at 50 µA with 2.5MHz frequency rating, suitable for power-constrained applications.

Packaging Variants: Cut Tape (CT) & Digi-Reel® packaged variants (-T suffix) are available for high-volume production, while Tube packaging variants support lower-volume requirements. All maintain identical electrical specifications within their respective part families.

Compliance Assurance: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher frequency rating than the original 500kHz specification?

A: Yes. A 555 Type Timer/Oscillator with a higher maximum frequency rating (1MHz, 2.1MHz, or 2.5MHz) can operate at the original 500kHz frequency without performance degradation. The higher frequency rating indicates the part's maximum capability, not a requirement for operation at that frequency.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, which is electrically and mechanically identical. No PCB redesign is required for footprint compatibility.

Q: What is the difference between tube and cut tape packaging?

A: Tube packaging is used for lower-volume orders and manual assembly processes. Cut Tape (CT) & Digi-Reel® packaging is used for high-volume automated assembly. Both contain identical components; packaging selection depends on production volume and assembly method.

Q: Why do some substitutes have lower supply current than the original part?

A: Different manufacturers optimize their 555 Type designs for various performance characteristics. Lower supply current (30 µA vs. 180 µA) indicates more efficient circuit design and is beneficial for battery-powered or power-constrained applications. This does not affect functional compatibility.

Q: Can I use a substitute with a narrower voltage range than the original 3V to 16V specification?

A: No. The ALD7555SAL operates at 2V to 10V, which does not fully encompass the original 3V to 16V range. If your circuit requires operation above 10V, this part is not suitable. All other substitutes support the original voltage range or exceed it.

Q: What is the significance of extended operating temperature ranges in some substitutes?

A: Extended temperature ranges (-40°C to 85°C or -25°C to 85°C) indicate the part maintains specifications across a wider environmental window than the original (0°C to 70°C). This provides additional reliability margin for applications operating in extreme temperature conditions, though it is not required for standard 0°C to 70°C operation.

Q: Are all substitute parts currently in production?

A: Yes. All listed substitute parts have Active product status, ensuring ongoing manufacturing support and long-term availability. The original ICM7555CD,623 is obsolete and no longer manufactured.

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