KA556DTF Equivalent & Substitute Parts

Part Overview

The KA556DTF is a dual timer/oscillator IC manufactured by onsemi, utilizing 555-type circuitry in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The KA556DTF operates across a supply voltage range of 4.5V to 16V with a maximum supply current of 16 mA and an operating temperature range of 0°C to 70°C.

Key Parameters

Parameter	KA556DTF
Manufacturer	onsemi
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Type	555 Type, Timer/Oscillator (Dual)
Voltage - Supply	4.5V ~ 16V
Current - Supply	16 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 KA556DTF is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 14-SOIC (0.154", 3.90mm Width) surface mount package
Functional Type: All parts must be 555-type dual timer/oscillator ICs
Voltage Supply Range: Substitute parts must support the 4.5V to 16V operating range or a range that encompasses it
Current Supply: Substitute parts must not exceed the application's current requirements
Operating Temperature: Substitute parts must cover the required temperature range (minimum 0°C to 70°C)
Mounting Type: Surface mount configuration required for PCB compatibility

Substitute parts are grouped into two categories: Upgrade Substitutes (direct functional replacements with enhanced specifications) and Similar Substitutes (functionally equivalent with variations in frequency, voltage range, or temperature rating).

Parameter Comparison

Part Number	Manufacturer	Voltage - Supply	Current - Supply	Operating Temperature	Frequency	Product Status	RoHS Status
KA556DTF	onsemi	4.5V ~ 16V	16 mA	0°C ~ 70°C	—	Obsolete	—
NA556D	Texas Instruments	4.5V ~ 16V	20 mA	-40°C ~ 105°C	—	Obsolete	ROHS3 Compliant
NA556DR	Texas Instruments	4.5V ~ 16V	20 mA	-40°C ~ 105°C	—	Active	ROHS3 Compliant
NE556D	STMicroelectronics	4.5V ~ 16V	20 mA	0°C ~ 70°C	500kHz	Obsolete	ROHS3 Compliant
NE556DR	Texas Instruments	4.5V ~ 16V	20 mA	0°C ~ 70°C	100kHz	Active	ROHS3 Compliant
TLC556CD	Texas Instruments	2V ~ 15V	720 µA	0°C ~ 70°C	2.1MHz	Active	ROHS3 Compliant
TLC556CDR	Texas Instruments	2V ~ 15V	720 µA	0°C ~ 70°C	2.1MHz	Active	ROHS3 Compliant
TLC556ID	Texas Instruments	3V ~ 15V	720 µA	-40°C ~ 85°C	2.1MHz	Active	ROHS3 Compliant
TLC556IDR	Texas Instruments	3V ~ 15V	720 µA	-40°C ~ 85°C	2.1MHz	Active	ROHS3 Compliant
TLC556MD	Texas Instruments	5V ~ 15V	720 µA	-55°C ~ 125°C	2.1MHz	Last Time Buy	ROHS3 Compliant
TLC556MDG4	Texas Instruments	5V ~ 15V	720 µA	-55°C ~ 125°C	2.1MHz	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Upgrade Substitutes (Direct Replacements)

NA556DR is the primary recommended substitute for the KA556DTF. This part maintains full voltage supply compatibility (4.5V ~ 16V), operates across an extended temperature range (-40°C ~ 105°C), and carries Active product status with ROHS3 compliance. The NA556DR is available in Cut Tape and Digi-Reel packaging with 30,400 units in stock, ensuring supply continuity.

NA556D provides an alternative upgrade path with identical electrical specifications to NA556DR but carries Obsolete product status. This part is suitable only for applications where long-term supply is not critical.

Similar Substitutes (Functionally Equivalent with Parameter Variations)

NE556DR (Texas Instruments, Active status) operates within the required voltage range and temperature window (0°C ~ 70°C) with a specified frequency of 100kHz. This part is suitable for applications where the frequency specification does not conflict with circuit requirements.

NE556D (STMicroelectronics, Obsolete status) provides similar functionality with a 500kHz frequency specification and identical temperature range to the KA556DTF.

Low-Power Alternatives (TLC556 Series)

The TLC556 series (TLC556CD, TLC556CDR, TLC556ID, TLC556IDR, TLC556MD, TLC556MDG4) offers significantly reduced supply current (720 µA versus 16-20 mA) and higher maximum frequency (2.1MHz). These parts are suitable for applications requiring lower power consumption or higher frequency operation. However, voltage supply ranges vary:

TLC556CD and TLC556CDR: 2V ~ 15V (lowest voltage floor)
TLC556ID and TLC556IDR: 3V ~ 15V with extended temperature range (-40°C ~ 85°C)
TLC556MD and TLC556MDG4: 5V ~ 15V with widest temperature range (-55°C ~ 125°C)

All TLC556 variants carry Active or Last Time Buy status with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can NA556DR directly replace KA556DTF without circuit modifications?

A: Yes. NA556DR maintains the same 14-SOIC package, 555-type dual timer/oscillator functionality, and voltage supply range (4.5V ~ 16V). The extended operating temperature range (-40°C ~ 105°C) and reduced supply current (20 mA versus 16 mA) are compatible with applications designed for the KA556DTF.

Q: What is the difference between NA556D and NA556DR?

A: Both parts are electrically identical (4.5V ~ 16V, 20 mA, -40°C ~ 105°C). The primary difference is packaging: NA556D is supplied in Tube packaging, while NA556DR is supplied in Cut Tape and Digi-Reel format. NA556DR carries Active product status, while NA556D is Obsolete.

Q: Can TLC556 series parts replace the KA556DTF?

A: TLC556 series parts are functionally equivalent 555-type dual timer/oscillators in the same 14-SOIC package but with different electrical characteristics. Substitution is possible only if the application tolerates: reduced supply current (720 µA), higher maximum frequency (2.1MHz), and potentially different voltage supply ranges depending on the specific TLC556 variant selected. Circuit validation is required to confirm compatibility with the original design specifications.

Q: What is the significance of the frequency specification in NE556D and NE556DR?

A: The frequency specification (500kHz for NE556D, 100kHz for NE556DR) indicates the maximum operating frequency of the timer/oscillator. These specifications do not restrict operation at lower frequencies but define the upper performance boundary. Applications operating below these frequency limits are unaffected by this parameter.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed carry ROHS3 Compliant status. The original KA556DTF does not specify RoHS compliance in the provided data.

Q: Which substitute part offers the widest operating temperature range?

A: TLC556MD and TLC556MDG4 offer the widest operating temperature range (-55°C ~ 125°C). These parts are suitable for applications requiring extreme temperature operation but are classified as Last Time Buy, indicating limited future availability.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (for manual assembly or small-volume applications), Cut Tape and Digi-Reel (for automated assembly and high-volume production), and Tape & Reel (for reel-fed pick-and-place equipment). Selection depends on production volume and assembly methodology.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message