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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74CB3Q3125PWR

Name: SN74CB3Q3125PWR
Brand: Texas Instruments
SKU: SN74CB3Q3125PWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CB3Q3125PWR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74CB3Q3125PWR.pdf

Description:: IC BUS SWITCH 1 X 1:1 14TSSOP

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Product details

Overview

SN74CB3Q3125PWR from Texas Instruments is a quadruple FET bus switch optimized for high-bandwidth, low-distortion signal routing in 2.5V/3.3V systems. It delivers rail-to-rail switching (0–5V with 3.3V V_CC), 3Ω typical ON-state resistance, <0.2 ns propagation delay, and 5V-tolerant I/Os-enabling clean USB interface and differential signal gating in optical networking equipment.

For engineers reviewing the SN74CB3Q3125PWR datasheet, SN74CB3Q3125PWR pinout, SN74CB3Q3125PWR application, or SN74CB3Q3125PWR equivalent, key selection criteria include its 20 MHz maximum OE switching frequency, 4 pF typical OFF-state I/O capacitance, I_off-enabled partial-power-down capability, and compatibility with 0.8V–5V logic families across –40°C to 85°C operation.

Technical Context

The SN74CB3Q3125PWR integrates four independent 1-bit bidirectional FET switches, each controlled by an active-low OE input. Its internal charge pump elevates the gate voltage to maintain flat r_on (4Ω typ) across the full 0–5V I/O swing, enabling minimal RC delay and distortion-free signal pass-through.

It supports true 5V-tolerant I/Os regardless of V_CC state (powered up/down), features undershoot clamp diodes on all data and control pins, and guarantees latch-up immunity >100 mA per JESD78 Class II-making it suitable for mixed-voltage board-level isolation and hot-swap-capable interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V to 3.6V - enables direct integration into 2.5V and 3.3V logic domains without level shifters
r_on (Typ)	3Ω at V_CC = 3.3V - ensures minimal insertion loss and signal attenuation for high-speed buses
C_io(OFF) (Typ)	4 pF - reduces capacitive loading on source/sink nodes, preserving signal integrity up to 500 MHz
Propagation Delay	0.12–0.2 ns - supports near-zero-latency bidirectional data flow critical for real-time interconnects
I_off Support	Yes - prevents backflow current during partial power-down, protecting upstream drivers and downstream loads
ESD Rating	2000V HBM - meets industrial-grade robustness requirements without external protection circuitry
Operating Temp	–40°C to +85°C - qualified for deployment in IP phones, PBX, and wireless infrastructure equipment

Pinout & Package

TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1 (unlimited reflow).

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE, 3OE, 4OE	Active-low enable inputs	Independently control each 1-bit switch; pulled high via resistor for power-up high-impedance safety
1A–4A, 1B–4B	Bidirectional data I/O ports	Each A–B pair forms a low-r_on, 5V-tolerant signal path; no direction pin required
V_CC	Power supply	Single 2.3–3.6V rail powers internal charge pump and logic; bypass with 0.1 µF capacitor
GND	Ground reference	Common return for all switch channels and control logic; must be low-inductance connection

Key Features

Feature	Design Value
Rail-to-rail analog switching	Supports 0–5V signals with 3.3V V_CC - eliminates need for external biasing in mixed-voltage USB or LVDS routing
5V-tolerant I/Os	Operates safely with 5.5V applied to A/B pins regardless of V_CC state - enables seamless interfacing with legacy 5V peripherals
Charge-pump-enhanced r_on	Maintains flat 3–8Ω ON-resistance across full input voltage range - preserves amplitude and timing fidelity in high-frequency data paths
Low dynamic power	I_CC = 0.3 mA typical - reduces system-level power budget impact in always-on telecom and networking modules
Partial-power-down (I_off)	Blocks current flow when V_CC = 0 - allows safe hot-plug operation and prevents backdrive damage in modular chassis designs

Applications

USB Interface Isolation	Differential Signal Routing
Use Scenario: Isolating USB 2.0 D+/D− lines between host controller and peripheral port while maintaining signal integrity. IC Role / Device Role / Timing Role: Bidirectional, low-capacitance bus switch providing channel-selectable isolation without introducing jitter or skew. Use Value: Enables hot-pluggable USB ports with <0.2 ns propagation delay and 4 pF OFF-state capacitance-preserving eye diagram margins at 480 Mbps.	Use Scenario: Gating differential clock or data pairs (e.g., LVDS, RSDS) in optical module transceivers. IC Role / Device Role / Timing Role: Symmetric, rail-to-rail analog switch ensuring matched rise/fall times and minimal crosstalk between complementary signals. Use Value: Delivers 3Ω r_on flatness and <1% amplitude mismatch across 0–3.3V swing-critical for sub-100 ps skew budgets in EPON video-over-fiber links.
Bus Signal Multiplexing	Optical Networking Backplane
Use Scenario: Selecting between multiple sensor or PHY interfaces sharing a common microcontroller data bus. IC Role / Device Role / Timing Role: Quad 1-bit switch enabling independent, glitch-free channel enable/disable under software control. Use Value: Supports 20 MHz OE toggle rate and 5V-tolerant I/Os-allowing dynamic reconfiguration of 1.8V/2.5V/3.3V sensors without level translators or timing penalties.	Use Scenario: Isolating control and status lines between line cards and shelf management controllers in WiMAX base stations. IC Role / Device Role / Timing Role: High-reliability, latch-up-immune bus switch providing fault containment and ESD-hardened signal coupling. Use Value: Meets JESD78 Class II (>100 mA) and 2000V HBM specs-ensuring uninterrupted operation in electrically noisy telecom backplanes.

USB Interface Isolation

Differential Signal Routing

Use Scenario: Isolating USB 2.0 D+/D− lines between host controller and peripheral port while maintaining signal integrity.

IC Role / Device Role / Timing Role: Bidirectional, low-capacitance bus switch providing channel-selectable isolation without introducing jitter or skew.

Use Value: Enables hot-pluggable USB ports with <0.2 ns propagation delay and 4 pF OFF-state capacitance-preserving eye diagram margins at 480 Mbps.

Use Scenario: Gating differential clock or data pairs (e.g., LVDS, RSDS) in optical module transceivers.

IC Role / Device Role / Timing Role: Symmetric, rail-to-rail analog switch ensuring matched rise/fall times and minimal crosstalk between complementary signals.

Use Value: Delivers 3Ω r_on flatness and <1% amplitude mismatch across 0–3.3V swing-critical for sub-100 ps skew budgets in EPON video-over-fiber links.

Bus Signal Multiplexing

Optical Networking Backplane

Use Scenario: Selecting between multiple sensor or PHY interfaces sharing a common microcontroller data bus.

IC Role / Device Role / Timing Role: Quad 1-bit switch enabling independent, glitch-free channel enable/disable under software control.

Use Value: Supports 20 MHz OE toggle rate and 5V-tolerant I/Os-allowing dynamic reconfiguration of 1.8V/2.5V/3.3V sensors without level translators or timing penalties.

Use Scenario: Isolating control and status lines between line cards and shelf management controllers in WiMAX base stations.

IC Role / Device Role / Timing Role: High-reliability, latch-up-immune bus switch providing fault containment and ESD-hardened signal coupling.

Use Value: Meets JESD78 Class II (>100 mA) and 2000V HBM specs-ensuring uninterrupted operation in electrically noisy telecom backplanes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3125PW	Higher r_on (7Ω typ), no charge pump, 2.5V–5.5V V_CC range	Limited to lower-frequency (<100 MHz) digital-only routing; lacks rail-to-rail analog support	Choose for cost-sensitive, non-analog applications where 5V V_CC simplifies supply architecture
TS3A24159RGTR	Lower bandwidth (300 MHz), 1.65–3.6V V_CC, 0.5Ω r_on, no 5V tolerance	Requires external clamping for 5V signals; optimized for portable battery-powered systems	Prefer for ultra-low r_on in 1.8V/3.3V mobile designs where 5V tolerance is unnecessary

Compared with SN74CBT3125PW and TS3A24159RGTR, the SN74CB3Q3125PWR uniquely combines 500 MHz bandwidth, 5V-tolerant rail-to-rail analog switching, and I_off-enabled power sequencing-making it the only option qualified for high-fidelity, mixed-voltage optical networking and USB 2.0 isolation.

Availability

SN74CB3Q3125PWR is available at Aetrix Electronics and suitable for optical networking, IP telephony, and wireless infrastructure applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74CB3Q3125PWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74CB3Q3125PWR belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal routing in broadband communications and optical networking systems.

FAQ

What is the maximum operating frequency supported by the SN74CB3Q3125PWR?

The SN74CB3Q3125PWR supports a maximum OE switching frequency of 20 MHz, with signal bandwidth extending up to 500 MHz due to its low 4 pF OFF-state capacitance and 3Ω typical ON-resistance. This enables reliable use in USB 2.0, LVDS, and EPON signal paths where minimal group delay and amplitude flatness are required. The device's performance is validated across the full –40°C to +85°C temperature range.

Does the SN74CB3Q3125PWR support 5V-tolerant I/Os when powered down?

Yes, the SN74CB3Q3125PWR maintains full 5V tolerance on all A/B I/O pins even when V_CC = 0 V, thanks to integrated undershoot clamp diodes and I_off circuitry. This allows safe connection to live 5V buses during hot-swap or partial-power-down events-critical for modular telecom and networking equipment. No external protection components are needed.

What is the recommended bypass capacitor for the SN74CB3Q3125PWR?

A 0.1 µF ceramic capacitor placed as close as possible to the V_CC pin is recommended for the SN74CB3Q3125PWR. This minimizes high-frequency supply noise and stabilizes the internal charge pump operation. TI specifies this value in Section 9 of the datasheet and confirms its effectiveness across the full 2.3–3.6V V_CC range and –40°C to +85°C operating temperature.

Can the SN74CB3Q3125PWR be used for analog signal switching?

Yes, the SN74CB3Q3125PWR is explicitly designed for both digital and analog applications, including USB interface, differential signaling, and low-distortion signal gating. Its rail-to-rail capability (0–5V with 3.3V V_CC), flat r_on, and low 4 pF OFF-state capacitance preserve analog waveform fidelity-validated in TI's CBT-C/CB3T/CB3Q application note for signal-switch families.

How does the SN74CB3Q3125PWR handle partial-power-down conditions?

The SN74CB3Q3125PWR implements I_off circuitry that actively blocks current backflow when V_CC = 0 V, preventing damage to upstream drivers or downstream loads during power sequencing. This feature is tested per JESD78 Class II (>100 mA) and enables safe hot-plug operation in multi-board systems-confirmed in Section 7.3 and Table 7-1 of the official SN74CB3Q3125PWR datasheet.

SN74CB3Q3125PWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CB

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 4

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 2.3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

SN74CB3Q3125PWR FAQ

1.How can I place an order for SN74CB3Q3125PWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CB3Q3125PWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74CB3Q3125PWR reliable?

The price and inventory of SN74CB3Q3125PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3125PWR is usually 5 days.

3.What payment methods are accepted for SN74CB3Q3125PWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3Q3125PWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CB3Q3125PWR?

SN74CB3Q3125PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CB3Q3125PWR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74CB3Q3125PWR?

For technical support, including SN74CB3Q3125PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3125PWR requirements.

6.How does Aetrix verify that SN74CB3Q3125PWR is sourced from the original manufacturer or authorized distributors?

All SN74CB3Q3125PWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74CB3Q3125PWR meets industry standards.

7.What is the process for return or replacement of SN74CB3Q3125PWR?

All SN74CB3Q3125PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3125PWR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74CB3Q3125PWR part is unused and in its original packaging.

Return procedure for SN74CB3Q3125PWR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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