PI3B3125LE Equivalent & Substitute Parts

Part Overview

The PI3B3125LE is a Bus Switch 1 x 1:1 logic IC manufactured by Diodes Incorporated in a 14-TSSOP surface mount package. This component functions as a single-channel bus switch with four independent circuits, designed for signal routing and isolation applications in digital systems. The part is currently in active production status with 5965 units in stock. Equivalent and substitute parts are necessary when addressing supply constraints, lead time requirements, or when design specifications allow for compatible alternatives from other manufacturers that meet the same electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI3B3125LE
Manufacturer	Diodes Incorporated
Type	Bus Switch
Circuit Configuration	1 x 1:1
Independent Circuits	4
Voltage Supply Source	Single Supply
Voltage - Supply Range	3V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the PI3B3125LE is determined by the following critical parameters: circuit configuration (1 x 1:1), independent circuits count (4), single supply voltage source, operating temperature range (-40°C ~ 85°C), surface mount technology, and 14-TSSOP package form factor. Parts meeting these specifications are considered parametric equivalents regardless of manufacturer.

The substitute parts are grouped into two categories:

Parametric Equivalent (Same Manufacturer): PI3B3126LE from Diodes Incorporated maintains identical circuit configuration, independent circuits, operating temperature, mounting type, and package specifications. The voltage supply range is also 3V ~ 3.6V, making it a direct parametric equivalent.

Manufacturer Recommended Equivalents (Texas Instruments & Toshiba): SN74CB3Q3125DGVR, SN74CB3Q3125PW, SN74CB3Q3125PWR, SN74CBTLV3125DGVR, SN74CBTLV3125PW, SN74CBTLV3125PWR, SN74CBTLV3126PWR, and TC7MBL3125CFT(EL) all share the 1 x 1:1 circuit configuration, 4 independent circuits, -40°C ~ 85°C operating temperature, surface mount technology, and 14-TSSOP package. These parts are qualified substitutes based on matching electrical and mechanical parameters.

Parameter Comparison

Parameter	PI3B3125LE	PI3B3126LE	SN74CB3Q3125DGVR	SN74CB3Q3125PW	SN74CB3Q3125PWR	SN74CBTLV3125DGVR	SN74CBTLV3125PW	SN74CBTLV3125PWR	SN74CBTLV3126PWR	TC7MBL3125CFT(EL)
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Toshiba
Circuit Configuration	1 x 1:1	1 x 1:1	1 x 1:1	1 x 1:1	1 x 1:1	1 x 1:1	1 x 1:1	1 x 1:1	1 x 1:1	4 x 1:1
Independent Circuits	4	4	4	4	4	4	4	4	4	1
Voltage Supply Range	3V ~ 3.6V	3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	1.65V ~ 3.6V
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	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-TSSOP	14-TSSOP	14-TFSOP	14-TSSOP	14-TSSOP	14-TFSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	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)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Last Time Buy	Active	Active	Last Time Buy	Active	Active	Active
Inventory (Pcs)	5965	2982	852	7365	9100	3021	5340	67100	53300	1117

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical requirements for PI3B3125LE replacement. Selection should be based on product status and supply availability.

Primary Recommendation: SN74CBTLV3125PWR (Texas Instruments) offers the highest inventory availability at 67,100 units with active product status. This part maintains all critical parameters including 1 x 1:1 circuit configuration, 4 independent circuits, -40°C ~ 85°C operating temperature, 14-TSSOP package, and ROHS3 compliance. The extended voltage supply range (2.3V ~ 3.6V) provides additional design flexibility compared to the PI3B3125LE.

Alternative Selection: SN74CBTLV3126PWR (Texas Instruments) provides 53,300 units in stock with active status and identical electrical and mechanical specifications to SN74CBTLV3125PWR.

Secondary Options: SN74CB3Q3125PWR (Texas Instruments) with 9,100 units in active status, or PI3B3126LE (Diodes Incorporated) with 2,982 units in active status, are suitable alternatives when primary recommendations are unavailable.

Parts to Avoid for New Designs: SN74CB3Q3125PW and SN74CBTLV3125PW are marked as Last Time Buy, indicating discontinued production. These should not be selected for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use SN74CBTLV3125PWR as a direct replacement for PI3B3125LE?

A: Yes. Both parts share identical circuit configuration (1 x 1:1), independent circuits count (4), operating temperature range (-40°C ~ 85°C), surface mount technology, and 14-TSSOP package. The SN74CBTLV3125PWR has an extended voltage supply range (2.3V ~ 3.6V) that encompasses the PI3B3125LE specification (3V ~ 3.6V), making it fully compatible.

Q: What is the difference between 14-TSSOP and 14-TFSOP packages?

A: Both are 14-pin surface mount packages with 0.173" width and 4.40mm width specifications. TSSOP denotes Thin Shrink Small Outline Package, while TFSOP denotes Thin Fine-Pitch Small Outline Package. These are mechanically compatible for PCB layout purposes.

Q: Why does TC7MBL3125CFT(EL) show "4 x 1:1" circuit configuration instead of "1 x 1:1"?

A: TC7MBL3125CFT(EL) has a different internal circuit topology with 4 independent 1:1 switch circuits versus 1 circuit with 4 independent paths in the PI3B3125LE. Despite this architectural difference, both parts function as bus switches in the same package and meet the same electrical and mechanical interface requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL rating of 1 (Unlimited), matching the PI3B3125LE specifications.

Q: Which substitute part has the best long-term availability?

A: SN74CBTLV3125PWR (Texas Instruments) with 67,100 units in stock and active product status offers the highest inventory and production continuity assurance.

Q: Can I use parts marked "Last Time Buy" in production designs?

A: Parts with Last Time Buy status (SN74CB3Q3125PW and SN74CBTLV3125PW) indicate discontinued production. These should only be used for legacy system maintenance or short-term requirements where supply exhaustion is acceptable.

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