SN74AC564DWR Equivalent & Substitute Parts

Part Overview

The SN74AC564DWR is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC surface mount package. The device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Active alternatives from onsemi and Texas Instruments are available with compatible or enhanced electrical characteristics.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN74AC564DWR
Category	Logic - Flip Flop
Type	D-Type
Number of Elements	1
Number of Bits per Element	8
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Clock Frequency	95 MHz
Max Propagation Delay @ V, Max CL	10.5ns @ 5V, 50pF
Current - Output High, Low	24mA, 24mA
Current - Quiescent (Iq)	4 µA
Output Type	Tri-State, Inverted
Trigger Type	Positive Edge
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 20-SOIC (0.295", 7.50mm Width) surface mount packaging
Functional Type: D-Type flip-flop with 1 element and 8-bit configuration
Trigger Mechanism: Positive edge triggering
Supply Voltage Range: 2V ~ 6V operation
Operating Temperature: -40°C ~ 85°C (TA)
Output Drive Capability: 24mA output current (high and low)
Electrical Performance: Clock frequency and propagation delay characteristics

Substitute parts are grouped into two categories based on output configuration:

Category A - Tri-State Inverted Output (Direct Functional Match)

SN74AC564DW (Texas Instruments, Active status)

Category B - Tri-State Non-Inverted Output (Functional Alternatives)

MC74AC374DWG (onsemi)
MC74AC374DWR2G (onsemi)
MC74AC574DWG (onsemi)
MC74AC574DWR2G (onsemi)

Category C - Non-Inverted Output (Functional Alternative)

MC74AC377DWR2G (onsemi)

Parameter Comparison

Parameter	SN74AC564DWR (Main)	SN74AC564DW	MC74AC374DWG	MC74AC374DWR2G	MC74AC377DWR2G	MC74AC574DWG	MC74AC574DWR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Clock Frequency	95 MHz	95 MHz	155 MHz	155 MHz	140 MHz	95 MHz	95 MHz
Max Propagation Delay @ V, Max CL	10.5ns @ 5V, 50pF	10.5ns @ 5V, 50pF	9.5ns @ 5V, 50pF	9.5ns @ 5V, 50pF	10ns @ 5V, 50pF	9.5ns @ 5V, 50pF	9.5ns @ 5V, 50pF
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Current - Quiescent (Iq)	4 µA	4 µA	8 µA	8 µA	8 µA	8 µA	8 µA
Input Capacitance	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF
Output Type	Tri-State, Inverted	Tri-State, Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Primary Recommendation: SN74AC564DW

The SN74AC564DW is the direct equivalent to the obsolete SN74AC564DWR. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and maintain the same tri-state inverted output configuration. The SN74AC564DW is currently in active production status with higher inventory availability (1280 pcs vs. 717 pcs). This part requires no circuit redesign and provides the most straightforward replacement path. The only difference is packaging format (Tube vs. Digi-Reel), which does not affect electrical performance.

Secondary Recommendations: onsemi 74AC Series Alternatives

For applications where output inversion is not critical to circuit function, onsemi alternatives provide enhanced electrical performance:

MC74AC374DWG / MC74AC374DWR2G: Offer improved clock frequency (155 MHz vs. 95 MHz) and reduced propagation delay (9.5ns vs. 10.5ns). Output is tri-state non-inverted. Moisture sensitivity level is MSL 3 (168 hours).
MC74AC574DWG / MC74AC574DWR2G: Maintain the 95 MHz clock frequency and 9.5ns propagation delay with tri-state non-inverted output. Available in multiple packaging formats (Tube and Cut Tape & Digi-Reel). Moisture sensitivity level is MSL 3 (168 hours).
MC74AC377DWR2G: Provides non-inverted output (not tri-state) with 140 MHz clock frequency and 10ns propagation delay. Suitable only for applications not requiring tri-state output capability. Moisture sensitivity level is MSL 3 (168 hours).

All onsemi alternatives are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part. Selection among onsemi options depends on specific circuit requirements for output inversion and tri-state functionality.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74AC564DWR with SN74AC564DW?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, operating parameters, and functional characteristics. The only difference is packaging format (Digi-Reel vs. Tube), which does not affect circuit performance. This is the recommended direct replacement.

Q: What is the difference between inverted and non-inverted output in these flip-flops?

A: Inverted output (SN74AC564DWR/DW) produces the logical complement of the input state at the output. Non-inverted output (MC74AC374, MC74AC574, MC74AC377 series) produces the same logical state as the input. Circuit design must account for this difference; inverted output parts cannot be substituted for non-inverted without modifying downstream logic.

Q: Are the onsemi alternatives pin-compatible with the original part?

A: All substitute parts use the same 20-SOIC (0.295", 7.50mm Width) package with identical pin count and arrangement. However, output logic levels differ between inverted and non-inverted variants. Physical pin compatibility does not guarantee functional compatibility without circuit analysis.

Q: What does MSL 3 (168 hours) mean compared to MSL 1 (Unlimited)?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 3 (168 hours) requires the component to be soldered within 168 hours of package opening. onsemi alternatives require more stringent moisture control during storage and assembly.

Q: Which substitute part offers the best performance improvement?

A: MC74AC374DWG and MC74AC374DWR2G provide the highest clock frequency (155 MHz vs. 95 MHz) and fastest propagation delay (9.5ns vs. 10.5ns). These improvements are beneficial for timing-critical applications but require output inversion logic to be addressed in circuit design.

Q: Can I use MC74AC377DWR2G as a substitute?

A: MC74AC377DWR2G is functionally compatible only if your circuit does not require tri-state output capability. This part provides non-inverted output without tri-state control, making it unsuitable for bus-sharing applications where multiple devices drive a common line.

Q: What packaging options are available for substitute parts?

A: SN74AC564DW is available in Tube packaging. onsemi alternatives are available in multiple formats: Tube (MC74AC374DWG, MC74AC574DWG), Tape & Reel (MC74AC374DWR2G, MC74AC377DWR2G, MC74AC574DWR2G), and Cut Tape & Digi-Reel (MC74AC574DWR2G). Packaging selection depends on procurement volume and assembly process requirements.

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