PI3B3244LEX Bus Switch 4 x 1:1 Equivalent & Substitute Parts

Part Overview

The PI3B3244LEX is a bus switch IC manufactured by Diodes Incorporated, designed for 4 x 1:1 switching applications in logic circuits. This surface-mount component operates from a single 3V to 3.6V supply and is housed in a 20-TSSOP package. The part is currently in active production status with 6618 units in stock.

Substitute parts become necessary when the primary part reaches end-of-life status, inventory constraints occur, or design requirements necessitate alternative sourcing from qualified manufacturers. The parts listed below maintain functional and electrical equivalence within the specified parameter ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI3B3244LEX
Manufacturer	Diodes Incorporated
Type	Bus Switch
Circuit Configuration	4 x 1:1
Independent Circuits	2
Voltage Supply Range	3V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PI3B3244LEX is determined by the following critical parameters:

Circuit Configuration: Must be 4 x 1:1 bus switch topology
Package Type: Must be 20-TSSOP with identical physical dimensions (0.173", 4.40mm Width)
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must support -40°C ~ 85°C minimum
Supply Voltage Compatibility: Substitute parts must operate within overlapping voltage ranges with the main part

The three qualified substitute parts meet all these criteria. Two parts from Texas Instruments (SN74CB3Q3244PW and SN74CB3Q3244PWR) operate at 2.3V ~ 3.6V, which encompasses the PI3B3244LEX supply range of 3V ~ 3.6V. The IDT part (74CBTLV3244PGG) also operates at 2.3V ~ 3.6V. All three maintain identical circuit configuration, package specifications, and temperature operating ranges.

Parameter Comparison

Parameter	PI3B3244LEX (Diodes)	SN74CB3Q3244PW (TI)	SN74CB3Q3244PWR (TI)	74CBTLV3244PGG (IDT)
Type	Bus Switch	Bus Switch	Bus Switch	Bus Switch
Circuit Configuration	4 x 1:1	4 x 1:1	4 x 1:1	4 x 1:1
Independent Circuits	2	2	2	2
Voltage Supply Range	3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified
Current Inventory	6618 Pcs	4439 Pcs	23200 Pcs	1419 Pcs

Engineering Selection Recommendations

SN74CB3Q3244PWR (Texas Instruments) is the primary recommended substitute. This part maintains Active product status, carries ROHS3 compliance certification, and has the highest inventory availability at 23200 units. The Tape & Reel packaging format supports high-volume production environments. The extended supply voltage range (2.3V ~ 3.6V) provides additional design margin compared to the PI3B3244LEX.

SN74CB3Q3244PW (Texas Instruments) serves as a secondary option with equivalent electrical specifications and ROHS3 compliance. However, this part carries Last Time Buy status, indicating limited future availability. Tube packaging is suitable for lower-volume applications. Selection of this part should account for long-term supply constraints.

74CBTLV3244PGG (IDT) is a tertiary alternative meeting all functional and mechanical requirements. This part maintains Active status with adequate inventory (1419 units). Bulk packaging format requires evaluation against specific procurement workflows. Compliance certifications for RoHS and moisture sensitivity are not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can SN74CB3Q3244PWR directly replace PI3B3244LEX without PCB modifications?

A: Yes. Both parts use identical 20-TSSOP packaging with matching pinout and physical dimensions. No PCB layout changes are required for direct substitution.

Q: What is the significance of the extended voltage range (2.3V ~ 3.6V) in the substitute parts?

A: The substitute parts operate at lower minimum voltages (2.3V versus 3V). This provides additional design flexibility and operational margin. Designs operating at the PI3B3244LEX minimum of 3V remain fully compatible with substitute parts.

Q: Why is SN74CB3Q3244PW marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this part number. Existing inventory will be depleted without replenishment. New designs should prioritize SN74CB3Q3244PWR or alternative active parts.

Q: Are all substitute parts RoHS3 compliant?

A: SN74CB3Q3244PW and SN74CB3Q3244PWR carry explicit ROHS3 Compliant certification. The 74CBTLV3244PGG RoHS status is not specified in the provided documentation and should be verified with the supplier.

Q: What packaging format should be selected for production?

A: SN74CB3Q3244PWR in Tape & Reel format is optimized for automated assembly and high-volume production. SN74CB3Q3244PW in Tube format suits lower-volume or manual assembly workflows. 74CBTLV3244PGG in Bulk format requires evaluation against specific procurement and handling requirements.

Q: Do all parts maintain the same moisture sensitivity level?

A: PI3B3244LEX and both Texas Instruments parts specify MSL 1 (Unlimited). The 74CBTLV3244PGG moisture sensitivity level is not specified in the provided data.

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