TS555IN Equivalent & Substitute Parts

Part Overview

The TS555IN is a 555-type timer/oscillator integrated circuit manufactured by STMicroelectronics, designed for clock and timing applications. This single timer IC operates at 2.7MHz with a supply voltage range of 2V to 16V and is packaged in an 8-DIP through-hole configuration. The TS555IN is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and component sourcing in applications requiring 555-type timer functionality.

Key Parameters

Parameter	TS555IN Value
Manufacturer	STMicroelectronics
Category	Clock/Timing
Type	555 Type, Timer/Oscillator (Single)
Frequency	2.7MHz
Voltage - Supply	2V ~ 16V
Current - Supply	65 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TS555IN is determined by strict compatibility across the following parameters:

Package Compatibility: All substitute parts must use the 8-DIP (0.300", 7.62mm) through-hole package to ensure mechanical and electrical pin compatibility.

Functional Type: All substitutes must be 555-type timer/oscillator single ICs to maintain functional equivalence in timing and oscillation applications.

Voltage Supply Range: The substitute part's supply voltage range must encompass or overlap with the TS555IN operating range of 2V to 16V. Parts with narrower ranges remain functional if the application operates within their specified limits.

Frequency Capability: While the TS555IN operates at 2.7MHz, substitute parts with different maximum frequency ratings (100kHz to 3MHz) are functionally equivalent for 555-type timer applications, as frequency capability does not restrict lower-frequency operation.

Current Supply: Supply current specifications vary across substitutes but do not restrict substitution, as they reflect design efficiency rather than functional incompatibility.

Operating Temperature Range: Substitute parts with temperature ranges that encompass the application's operating conditions are suitable. The TS555IN range of -40°C to 125°C represents extended industrial specifications.

Compliance Standards: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the TS555IN environmental certifications.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage Supply	Current Supply	Operating Temp	Package	Product Status
TS555IN	STMicroelectronics	2.7MHz	2V ~ 16V	65 µA	-40°C ~ 125°C	8-DIP	Obsolete
LMC555CN/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-DIP	Active
ICM7555IPAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	8-DIP	Active
ICM7555IPA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	8-DIP	Active
ALD1502PAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 12V	50 µA	0°C ~ 70°C	8-DIP	Active
LM555CN/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-DIP	Active
NA555P	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	-40°C ~ 105°C	8-DIP	Active
NE555P	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-DIP	Active
SA555P	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	-40°C ~ 85°C	8-DIP	Active
SE555P	Texas Instruments	100kHz	4.5V ~ 18V	10 mA	-55°C ~ 125°C	8-DIP	Active
TLC551CP	Texas Instruments	1.8MHz	1V ~ 15V	360 µA	0°C ~ 70°C	8-DIP	Last Time Buy

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement:

The LMC555CN/NOPB and ICM7555IPAZ are the most suitable direct substitutes for the TS555IN. Both parts are active products with ROHS3 compliance, matching the environmental certifications of the obsolete TS555IN. The LMC555CN/NOPB operates at 3MHz, exceeding the TS555IN frequency capability, and maintains a supply voltage range of 1.5V to 15V. The ICM7555IPAZ operates at 1MHz with a supply range of 2V to 18V, providing extended upper voltage capability. Both parts are available in high inventory quantities and support the full 8-DIP package requirement.

Extended Temperature Range Consideration:

The SE555P offers the widest operating temperature range (-55°C to 125°C), matching the TS555IN's upper temperature limit of 125°C while extending lower temperature operation. This part is suitable for applications requiring extended industrial or military temperature specifications. The SE555P is an active product with full ROHS3 compliance.

Supply Voltage Compatibility:

For applications requiring operation at the TS555IN's minimum supply voltage of 2V, the ICM7555IPAZ, LMC555CN/NOPB, and ALD1502PAL are compatible. The LM555CN/NOPB, NA555P, NE555P, SA555P, and SE555P require minimum supply voltages of 4.5V and are not suitable for 2V operation.

Product Status Consideration:

All substitute parts listed are either active products or designated as Last Time Buy (TLC551CP), ensuring continued availability and manufacturing support. The TS555IN's obsolete status necessitates transition to one of these active alternatives for new designs or production continuity.

Frequently Asked Questions (FAQ)

Q: Can the LMC555CN/NOPB directly replace the TS555IN in all applications?

A: The LMC555CN/NOPB is mechanically and functionally compatible with the TS555IN, sharing the 8-DIP package and 555-type timer architecture. However, the LMC555CN/NOPB operates at 3MHz compared to the TS555IN's 2.7MHz, and its supply voltage range is 1.5V to 15V versus the TS555IN's 2V to 16V. Applications operating within these parameter ranges will function correctly with the LMC555CN/NOPB.

Q: What is the difference between the various Texas Instruments 555 variants (NE555P, NA555P, SA555P, SE555P)?

A: These parts are all 555-type timers in 8-DIP packages with identical frequency (100kHz) and supply current (10 mA) specifications. They differ in operating temperature ranges: NE555P operates 0°C to 70°C, NA555P operates -40°C to 105°C, SA555P operates -40°C to 85°C, and SE555P operates -55°C to 125°C. Selection depends on the application's temperature requirements.

Q: Is the ICM7555IPAZ suitable for high-frequency applications?

A: The ICM7555IPAZ operates at 1MHz maximum frequency, which is lower than the TS555IN's 2.7MHz. For applications requiring frequencies above 1MHz, the LMC555CN/NOPB (3MHz) or ALD1502PAL (2.5MHz) are more appropriate substitutes.

Q: Can I use a 100kHz timer in place of the 2.7MHz TS555IN?

A: The maximum frequency rating indicates the highest frequency the timer can generate. A 100kHz-rated timer can operate at any frequency up to 100kHz. If your application requires frequencies above 100kHz, a 100kHz-rated timer is not suitable. If your application operates below 100kHz, these parts are functionally compatible.

Q: What is the significance of the 8-DIP package specification?

A: The 8-DIP (0.300", 7.62mm) package is a through-hole dual inline package with 8 pins spaced 0.300 inches apart. All listed substitute parts use this identical package, ensuring pin-for-pin compatibility and direct board-level replacement without PCB modifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the TS555IN. This ensures compatibility with modern manufacturing and environmental regulations.

Q: Which substitute offers the lowest power consumption?

A: The ICM7555IPA+ has the lowest supply current specification at 30 µA, compared to the TS555IN's 65 µA. However, this part operates at only 500kHz maximum frequency. For applications prioritizing low power consumption within frequency constraints, the ICM7555IPA+ is the optimal choice.

Q: Is the TLC551CP a viable long-term substitute?

A: The TLC551CP is designated as Last Time Buy, indicating limited future availability. While currently available with 2,335 pieces in stock, it is not recommended for new designs requiring long-term production support. Active products such as the LMC555CN/NOPB or ICM7555IPAZ are preferred for sustained component sourcing.

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