PI5C3244Q Equivalent & Substitute Parts

Part Overview

The PI5C3244Q is a 4 x 1:1 bus switch logic IC manufactured by Diodes Incorporated in a 20-QSOP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production needs. The part operates on single supply voltage (4.75V ~ 5.25V) and supports a temperature range of -40°C to 85°C, making it suitable for standard industrial and commercial applications requiring bus switching functionality.

Key Parameters

Parameter	Value
Type	Bus Switch
Circuit Configuration	4 x 1:1
Independent Circuits	2
Voltage Supply Source	Single Supply
Voltage - Supply Range	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI5C3244Q is determined by the following critical parameters:

Circuit configuration (4 x 1:1 bus switch topology)
Independent circuits count (2)
Voltage supply range compatibility
Operating temperature range (-40°C ~ 85°C)
Surface mount packaging with equivalent footprint dimensions
Functional equivalence as a logic bus switch

Substitute parts are grouped into two categories based on package type and compliance status:

Category 1: Renesas QS3244 Series - Direct functional equivalents with improved RoHS3 compliance and active product status.

Category 2: Texas Instruments SN74CBT3244 Series - Functional equivalents with extended voltage supply range (4V ~ 5.5V) and multiple package options. Some variants are in Last Time Buy status.

Parameter Comparison

Parameter	PI5C3244Q	QS3244QG	QS3244QG8	SN74CBT3244CDBQR	SN74CBT3244CDGVR	SN74CBT3244CPW	SN74CBT3244CPWR	SN74CBT3244DBQR	SN74CBT3244DBR	SN74CBT3244DGVR	SN74CBT3244PW
Manufacturer	Diodes Inc.	Renesas	Renesas	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1	Bus Switch 4x1:1
Independent Circuits	2	2	2	2	2	2	2	2	2	2	2
Voltage Supply Range	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4V ~ 5.5V	4V ~ 5.5V	4V ~ 5.5V	4V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
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	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-TFSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.209", 5.30mm)	20-TFSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Last Time Buy	Last Time Buy	Last Time Buy	Last Time Buy
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Type	Not specified	Tube	Tape & Reel	Tape & Reel	Tape & Reel	Tube	Tape & Reel	Tape & Reel	Tape & Reel	Tape & Reel	Tube

Engineering Selection Recommendations

Primary Recommendation: Renesas QS3244 Series

The QS3244QG and QS3244QG8 are the preferred substitutes for the obsolete PI5C3244Q. Both parts maintain identical voltage supply range (4.75V ~ 5.25V) and operating temperature specifications. Both are ROHS3 compliant with active product status, ensuring long-term availability and supply chain stability. The QS3244QG8 variant in Tape & Reel packaging offers higher inventory availability (9,708 units) compared to the tube-packaged QS3244QG (4,850 units).

Secondary Recommendation: Texas Instruments SN74CBT3244 Series

The SN74CBT3244 family provides functional equivalence with extended voltage supply range (4V ~ 5.5V or 4.5V ~ 5.5V depending on variant), offering broader operational flexibility. Active variants include SN74CBT3244CDBQR, SN74CBT3244CDGVR, SN74CBT3244CPW, and SN74CBT3244CPWR. These parts are ROHS3 compliant and suitable for new designs. Last Time Buy variants (SN74CBT3244DBQR, SN74CBT3244DBR, SN74CBT3244DGVR, SN74CBT3244PW) remain available but should not be selected for new production designs.

Package Considerations

Direct footprint compatibility exists between PI5C3244Q and QS3244QG/QS3244QG8 (both 20-SSOP, 0.154", 3.90mm width). Texas Instruments variants offer alternative packages: 20-SSOP (SN74CBT3244CDBQR, SN74CBT3244DBQR), 20-TFSOP (SN74CBT3244CDGVR, SN74CBT3244DGVR), and 20-TSSOP (SN74CBT3244CPW, SN74CBT3244CPWR, SN74CBT3244PW). Package selection depends on PCB layout requirements and available footprint space.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI5C3244Q with QS3244QG without PCB modifications?

A: Yes. Both parts use identical 20-SSOP packaging with 0.154" (3.90mm) width, ensuring direct footprint compatibility. Electrical parameters including voltage supply range (4.75V ~ 5.25V) and operating temperature (-40°C ~ 85°C) are identical.

Q: What is the difference between QS3244QG and QS3244QG8?

A: Both parts are functionally identical with matching electrical specifications and RoHS3 compliance. The primary difference is packaging: QS3244QG is supplied in Tube format, while QS3244QG8 is supplied in Tape & Reel format. QS3244QG8 offers higher inventory availability and is preferred for high-volume production.

Q: Why do Texas Instruments SN74CBT3244 variants have different voltage supply ranges?

A: The SN74CBT3244 family includes variants with different voltage specifications. Active variants (SN74CBT3244CDBQR, SN74CBT3244CDGVR, SN74CBT3244CPW, SN74CBT3244CPWR) support 4V ~ 5.5V, while Last Time Buy variants support 4.5V ~ 5.5V. The extended lower voltage limit (4V) in active variants provides additional design flexibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (QS3244QG, QS3244QG8, and all SN74CBT3244 variants) are ROHS3 compliant. The original PI5C3244Q is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

Q: Can I use SN74CBT3244 variants with different package types interchangeably?

A: No. While all SN74CBT3244 variants are functionally equivalent, they use different packages: 20-SSOP, 20-TFSOP, and 20-TSSOP. Package selection must match your PCB footprint design. Footprint dimensions differ between package types and are not interchangeable without PCB redesign.

Q: Should I select Last Time Buy variants for new designs?

A: No. Last Time Buy status indicates limited future availability. For new production designs, select active variants: QS3244QG/QS3244QG8 (Renesas) or SN74CBT3244CDBQR, SN74CBT3244CDGVR, SN74CBT3244CPW, SN74CBT3244CPWR (Texas Instruments).

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL ratings indicate moisture sensitivity during storage and handling. MSL 1 (Unlimited) parts have no moisture sensitivity restrictions. MSL 2 (1 Year) parts require controlled storage conditions and have a one-year shelf life from manufacturing. QS3244 series and most SN74CBT3244 variants carry MSL 1 rating, providing superior handling flexibility.

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