PI3B3384QEX Equivalent & Substitute Parts

Part Overview

The PI3B3384QEX is a Bus Switch 5 x 1:1 logic IC manufactured by Diodes Incorporated in a 24-QSOP package. This component functions as a low-voltage bus switch for signal routing and multiplexing applications. The part is currently obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and new production requirements. Substitute parts must maintain functional equivalence through matching circuit topology, voltage supply specifications, operating temperature range, and package compatibility.

Key Parameters

Parameter	Value
Type	Bus Switch
Circuit Configuration	5 x 1:1
Independent Circuits	2
Voltage Supply Source	Single Supply
Voltage - Supply Range	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-SSOP (0.154", 3.90mm Width)
Supplier Device Package	24-QSOP
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI3B3384QEX is determined by strict adherence to the following electrical and mechanical parameters:

Electrical Compatibility Requirements:

Circuit topology: 5 x 1:1 bus switch configuration with 2 independent circuits
Voltage supply range must encompass or exceed 3V ~ 3.6V
Operating temperature range: -40°C ~ 85°C
Single supply voltage source architecture

Mechanical Compatibility Requirements:

Surface mount technology
Package footprint compatibility: 24-pin QSOP or 24-pin TSSOP packages (both 24-pin configurations with compatible pitch and dimensions)
Pin count: 24 pins

Compliance Requirements:

RoHS3 compliance preferred for new designs
REACH unaffected status

Substitute parts are grouped into two package variants: 24-QSOP (direct footprint match) and 24-TSSOP (compatible alternative with slightly different body width). All listed substitutes maintain the 5 x 1:1 circuit topology, dual independent circuit structure, and specified operating parameters.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Circuit	Voltage Supply (V)	Operating Temp (°C)	Package	Product Status	RoHS3	MSL
PI3B3384QEX	Diodes Incorporated	5 x 1:1	3.0 ~ 3.6	-40 ~ 85	24-QSOP	Obsolete	Yes	1
74CBTLV3384PGG	IDT	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-TSSOP	Active	No	1
74CBTLV3384PGG8	Renesas Electronics	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-TSSOP	Active	Yes	1
74CBTLV3384QG	IDT	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-QSOP	Active	No	1
74CBTLV3384QG8	IDT	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-QSOP	Active	No	1
SN74CB3Q3384ADBQR	Texas Instruments	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-SSOP	Active	Yes	2
SN74CB3Q3384APW	Texas Instruments	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-TSSOP	Last Time Buy	Yes	1
SN74CB3Q3384APWR	Texas Instruments	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-TSSOP	Active	Yes	1
SN74CBTLV3384DBQR	Texas Instruments	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-SSOP	Active	Yes	2
SN74CBTLV3384PW	Texas Instruments	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-TSSOP	Active	Yes	1
SN74CBTLV3384PWR	Texas Instruments	5 x 1:1	2.3 ~ 3.6	-40 ~ 85	24-TSSOP	Active	Yes	1

Engineering Selection Recommendations

For Direct Footprint Replacement (24-QSOP Package): Select 74CBTLV3384QG or 74CBTLV3384QG8 from IDT for immediate pin-compatible substitution. Both parts maintain the 24-QSOP package footprint and are in active production status. The extended voltage supply range (2.3V ~ 3.6V) provides additional design margin compared to the original PI3B3384QEX specification.

For New Designs with RoHS3 Compliance Priority: Select SN74CBTLV3384PWR or SN74CB3Q3384APWR from Texas Instruments. Both parts are active, RoHS3 compliant, and feature MSL 1 rating. The 24-TSSOP package requires PCB layout adjustment but offers superior long-term availability and compliance certification.

For Cost-Optimized Procurement: The 74CBTLV3384PGG8 from Renesas Electronics provides active production status with RoHS3 compliance in a 24-TSSOP package, offering high inventory availability (6,100 units) at competitive pricing.

For Moisture-Sensitive Applications: Parts with MSL 1 rating (unlimited shelf life) are preferred: 74CBTLV3384QG, 74CBTLV3384QG8, 74CBTLV3384PGG, SN74CB3Q3384APW, SN74CBTLV3384PW, and SN74CBTLV3384PWR. Avoid MSL 2 rated parts (SN74CB3Q3384ADBQR, SN74CBTLV3384DBQR) for applications requiring extended storage without controlled humidity.

Frequently Asked Questions (FAQ)

Q: Can I use a 24-TSSOP package substitute in place of the original 24-QSOP package?

A: No direct PCB substitution is possible without layout modification. While both packages contain 24 pins with compatible electrical specifications, the 24-TSSOP package has a body width of 4.40mm compared to 24-QSOP at 3.90mm. PCB footprint redesign is required. However, electrical functionality and pin assignments are identical.

Q: What is the voltage supply range difference between PI3B3384QEX and substitute parts?

A: The original PI3B3384QEX operates at 3.0V ~ 3.6V. All substitute parts operate at 2.3V ~ 3.6V, providing a lower minimum voltage threshold. This extended range is fully backward compatible with the original specification and does not require circuit redesign.

Q: Are all substitute parts RoHS3 compliant?

A: No. IDT parts (74CBTLV3384 series) do not carry RoHS3 certification. Texas Instruments parts (SN74CBTLV3384 and SN74CB3Q3384 series) are RoHS3 compliant. Renesas 74CBTLV3384PGG8 is RoHS3 compliant. Verify compliance requirements for your application before selection.

Q: What does MSL rating mean for this component?

A: MSL (Moisture Sensitivity Level) indicates shelf life under controlled humidity. MSL 1 parts have unlimited shelf life. MSL 2 parts require use within one year of opening the moisture barrier bag. For applications with extended storage or high-humidity environments, select MSL 1 rated parts.

Q: Which substitute offers the best long-term availability?

A: SN74CBTLV3384PWR from Texas Instruments is recommended for long-term designs. It is in active production status with 3,452 units in stock, carries RoHS3 compliance, and features MSL 1 rating. Texas Instruments maintains extensive product documentation and support for the 74CBTLV3384 series.

Q: Can I mix different substitute part manufacturers in the same design?

A: Yes. All listed substitutes maintain identical electrical specifications (5 x 1:1 circuit topology, 2.3V ~ 3.6V supply, -40°C ~ 85°C operating range). However, maintain consistent packaging within a single PCB design to avoid layout complications. Different manufacturers may have minor variations in switching characteristics not specified in the provided parameters.

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