Texas Instruments SN74CB3Q3253PWRG4

Overview

SN74CB3Q3253PWRG4 from Texas Instruments is a dual 1-of-4 FET multiplexer–demultiplexer bus switch operating at 2.5 V–3.3 V, delivering up to 500 MHz bandwidth, 4 Ω typical ON-state resistance (ron), 3.5 pF typical OFF-state I/O capacitance (Cio(OFF)), and bidirectional rail-to-rail switching across 0–5 V signal levels. It serves as a high-fidelity signal path selector in USB interface routing and differential bus isolation.

For engineers reviewing the SN74CB3Q3253PWRG4 datasheet, SN74CB3Q3253PWRG4 pinout, SN74CB3Q3253PWRG4 application, or SN74CB3Q3253PWRG4 equivalent, key selection criteria include its 5-V tolerant I/Os with powered-up/down operation, partial-power-down support via Ioff, low propagation delay (<0.18 ns), and compatibility with TTL/3.3-V/5-V CMOS control inputs.

Technical Context

The SN74CB3Q3253PWRG4 integrates two independent 1-of-4 analog/digital multiplexer–demultiplexer channels, each with dedicated active-low output-enable (1OE, 2OE) and 2-bit select (S0, S1) inputs. Its charge-pump-enhanced FET architecture elevates gate voltage to maintain flat ron over supply (2.3–3.6 V) and signal (0–5.5 V) ranges.

Each channel supports bidirectional data flow between one common port (1A/2A) and four I/O ports (1B1–1B4 / 2B1–2B4), with near-zero propagation delay due to low ron and minimal Cio(ON) (13–17 pF). Control logic follows positive-logic truth table: OE low enables path; S1/S0 determine B-port connection; OE high forces high-impedance isolation.

Key Specifications

Pinout & Package

TSSOP-16 package (PW), body size 5.00 mm × 4.40 mm, with exposed thermal pad (not electrically connected); RoHS-compliant, NIPDAU lead finish, MSL Level-1 (260°C, unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CB3Q3253PWRG4, SN74CBT3253PWR trades bandwidth and voltage flexibility for simpler biasing, while TS3L501EGET offers superior isolation at the cost of channel count and power-down safety - making SN74CB3Q3253PWRG4 optimal for compact, mixed-voltage, high-reliability routing.

Availability

SN74CB3Q3253PWRG4 is available at Aetrix Electronics and suitable for USB interface routing, differential bus isolation, and video broadcasting transcoder applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74CB3Q3253PWRG4 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 specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in high-performance signal chain solutions.

The CB3Q family, including SN74CB3Q3253PWRG4, was designed specifically for high-bandwidth, low-distortion signal gating in mixed-voltage digital and analog systems - targeting USB, video, and test equipment markets where timing fidelity and voltage flexibility are critical.

FAQ

What is the maximum signal voltage supported by SN74CB3Q3253PWRG4 when VCC = 3.3 V?

The SN74CB3Q3253PWRG4 supports 0–5.5 V signal levels on all I/O ports (1A, 1B1–1B4, 2A, 2B1–2B4) regardless of VCC setting. At VCC = 3.3 V, it enables true rail-to-rail switching from 0 V to 5 V, making SN74CB3Q3253PWRG4 ideal for interfacing 3.3-V controllers with 5-V peripherals without external level shifters.

Does SN74CB3Q3253PWRG4 support hot-swap or partial-power-down operation?

Yes, SN74CB3Q3253PWRG4 includes Ioff circuitry that disables current backflow when VCC = 0 V, enabling safe hot-swap and partial-power-down operation. This feature protects upstream and downstream components during power sequencing mismatches - a key reliability advantage confirmed in SN74CB3Q3253PWRG4's JESD 78 Class II latch-up rating (>100 mA).

What is the typical ON-state resistance (ron) of SN74CB3Q3253PWRG4 and how does it vary with supply voltage?

SN74CB3Q3253PWRG4 delivers 4 Ω typical ron at VCC = 2.5 V and 3.5 Ω typical at VCC = 3.0 V, remaining flat across the 2.3–3.6 V operating range due to its integrated charge pump. This stable ron ensures consistent signal attenuation and minimal propagation delay variation - a verified characteristic documented in SN74CB3Q3253PWRG4's electrical specifications table.

Can SN74CB3Q3253PWRG4 be used for analog signal switching, such as audio or sensor outputs?

Yes, SN74CB3Q3253PWRG4 is qualified for both digital and analog applications, including low-distortion signal gating. Its low ron (4 Ω), low Cio(OFF) (3.5 pF), and rail-to-rail capability support audio line-level signals and precision sensor outputs without clipping or bandwidth loss - explicitly cited in SN74CB3Q3253PWRG4's official Applications section.

What package type and moisture sensitivity level (MSL) apply to SN74CB3Q3253PWRG4?

SN74CB3Q3253PWRG4 uses the TSSOP-16 (PW) package, 5.00 mm × 4.40 mm body size, with NIPDAU lead finish and MSL Level-1 (260°C, unlimited floor life). This matches the official TI orderable addendum listing for SN74CB3Q3253PWRG4, confirming compatibility with standard surface-mount assembly processes without bake requirements.