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

Texas Instruments SN74CBT3253RGYR

Name: SN74CBT3253RGYR
Brand: Texas Instruments
SKU: SN74CBT3253RGYR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74CBT3253RGYR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-VFQFN Exposed Pad

Datasheet:: SN74CBT3253RGYR.pdf

Description:: IC MUX/DEMUX 2 X 4:1 16VQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74CBT3253RGYR from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer in a 16-pin VQFN (RGY) package, featuring TTL-compatible inputs, 5 Ω typical on-state resistance at 4.5 V, <0.25 ns propagation delay, and operation from −40°C to 85°C. It routes high-speed digital signals in bus-switching applications such as memory address selection and data path routing.

For engineers reviewing the SN74CBT3253RGYR datasheet, SN74CBT3253RGYR pinout, SN74CBT3253RGYR application, or SN74CBT3253RGYR equivalent, key selection criteria include its low on-resistance, sub-nanosecond switching, 4–5.5 V supply range, and QFN thermal performance (θ_JA = 39°C/W).

Technical Context

The SN74CBT3253RGYR implements two independent bidirectional 1-of-4 analog/digital switches using NMOS pass transistors with no internal level-shifting circuitry. Each channel supports rail-to-rail signal swing and operates with zero static power consumption when enabled.

Control logic uses active-low OE inputs (1OE, 2OE) and 2-bit binary select lines (S1, S0) to route A-port signals to one of four B-port terminals per section. The device exhibits no latch-up under normal operating conditions and tolerates input voltages up to 7 V regardless of V_CC.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4 V to 5.5 V - ensures compatibility with 5 V TTL and mixed-voltage systems without level shifters
On-State Resistance	5 Ω typical at V_CC = 4.5 V - minimizes voltage drop and signal distortion in high-current digital paths
Propagation Delay	0.25 ns at V_CC = 5 V - enables use in >1 GHz clock domains and high-speed bus isolation
Input Capacitance	3.5 pF on control pins - reduces loading on driving logic and preserves signal edge integrity
Off-State Leakage	±1 μA max - prevents unintended current paths during signal isolation in standby modes
Thermal Resistance	θ_JA = 39°C/W (RGY package) - supports higher sustained current density versus SOIC/SSOP variants
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded and communications equipment

Pinout & Package

VQFN-16 (RGY) package: 3.5 mm × 3.5 mm body, 0.5 mm pitch, exposed thermal pad, 0.9 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output enable	Disables both channels of respective section; high-Z state isolates A and B ports
S0, S1	Binary channel select	2-bit code selects which of four B terminals connects to A terminal (00→B1, 01→B2, etc.)
1A, 2A	Common input/output port	Bidirectional signal path; connects to selected Bx terminal when OE is low and S0/S1 match
1B1–1B4, 2B1–2B4	Channel outputs/inputs	Four dedicated terminals per section; all support full rail-to-rail analog/digital signal pass-through
V_CC	Power supply	Supplies switch bias; must be stable within 4–5.5 V; powers internal gate drive circuitry
GND	Ground reference	Return path for all signals and internal logic; requires low-impedance connection to minimize noise coupling

Key Features

Feature	Design Value
TTL-compatible control inputs	VIH = 2 V, VIL = 0.8 V - directly interfaces with legacy 5 V CMOS/TTL logic without pull-ups or translators
Bidirectional signal routing	No direction pin required - same terminal serves as input or output depending on external signal source/sink
Low on-capacitance	C_io(OFF) = 4 pF - maintains high-frequency signal integrity and reduces crosstalk in dense PCB layouts
Rail-to-rail analog capability	Supports DC to 200 MHz signals - usable for both digital bus switching and low-frequency analog multiplexing
Zero static power draw	ICC = 3 μA max - eliminates quiescent current penalty in always-on system monitoring paths

Applications

Memory Address Multiplexing	PCI Express Lane Switching
Use Scenario: Selecting between two memory banks sharing a common address/data bus in microcontroller-based data loggers. IC Role / Device Role / Timing Role: Dual 1-of-4 switch isolates and routes address lines from MCU to either SRAM or Flash bank based on software configuration. Use Value: Eliminates need for discrete logic gates or larger CPLDs; 5 Ω R_on preserves setup/hold timing margins across 20 MHz address strobes.	Use Scenario: Dynamic reconfiguration of PCIe x1 lanes between baseband processor and RF transceiver in 5G small cell radios. IC Role / Device Role / Timing Role: Bidirectional analog switch reroutes differential lane pairs under firmware control during mode transitions. Use Value: Sub-ns t_pd avoids violating PCIe Gen1 eye diagram requirements; 4 pF C_io(OFF) limits inter-lane crosstalk below −40 dB.
Test Equipment Signal Routing	Digital Audio I²S Bus Sharing
Use Scenario: Automated test fixtures that route stimulus signals from multiple sources to DUT pins via programmable path selection. IC Role / Device Role / Timing Role: Dual multiplexer provides eight independent selectable paths (four per section) controlled by FPGA GPIOs. Use Value: 7 V absolute max input rating allows safe connection to open-drain test drivers; ±1 μA leakage prevents false triggering during high-Z states.	Use Scenario: Sharing a single I²S interface between DSP, codec, and Bluetooth audio module in portable media players. IC Role / Device Role / Timing Role: Routes LRCLK, BCLK, and SDATA lines between master and slave devices without introducing jitter or skew. Use Value: 0.25 ns t_pd variation across channels ensures <10 ps inter-channel skew - critical for maintaining I²S frame alignment.

Memory Address Multiplexing

PCI Express Lane Switching

Use Scenario: Selecting between two memory banks sharing a common address/data bus in microcontroller-based data loggers.

IC Role / Device Role / Timing Role: Dual 1-of-4 switch isolates and routes address lines from MCU to either SRAM or Flash bank based on software configuration.

Use Value: Eliminates need for discrete logic gates or larger CPLDs; 5 Ω R_on preserves setup/hold timing margins across 20 MHz address strobes.

Use Scenario: Dynamic reconfiguration of PCIe x1 lanes between baseband processor and RF transceiver in 5G small cell radios.

IC Role / Device Role / Timing Role: Bidirectional analog switch reroutes differential lane pairs under firmware control during mode transitions.

Use Value: Sub-ns t_pd avoids violating PCIe Gen1 eye diagram requirements; 4 pF C_io(OFF) limits inter-lane crosstalk below −40 dB.

Test Equipment Signal Routing

Digital Audio I²S Bus Sharing

Use Scenario: Automated test fixtures that route stimulus signals from multiple sources to DUT pins via programmable path selection.

IC Role / Device Role / Timing Role: Dual multiplexer provides eight independent selectable paths (four per section) controlled by FPGA GPIOs.

Use Value: 7 V absolute max input rating allows safe connection to open-drain test drivers; ±1 μA leakage prevents false triggering during high-Z states.

Use Scenario: Sharing a single I²S interface between DSP, codec, and Bluetooth audio module in portable media players.

IC Role / Device Role / Timing Role: Routes LRCLK, BCLK, and SDATA lines between master and slave devices without introducing jitter or skew.

Use Value: 0.25 ns t_pd variation across channels ensures <10 ps inter-channel skew - critical for maintaining I²S frame alignment.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBTD3384DBR	8-channel, 3.3 V only, higher R_on (7 Ω), no 5 V tolerance	Requires level-shifting for 5 V systems; better suited for low-voltage portable designs	Select when operating exclusively at 3.3 V and needing more channels in SSOP-24
TS3A4751PWR	Single 4:1, 1.65–3.6 V supply, 0.7 Ω R_on, smaller 16-pin TSSOP	Not pin-compatible; lacks dual-section architecture and 5 V tolerance	Choose for ultra-low R_on in battery-powered 3 V systems where dual-channel operation is unnecessary

Compared with SN74CBT3253RGYR, SN74CBTD3384DBR offers higher channel count but sacrifices 5 V compatibility and thermal performance (θ_JA = 82°C/W), while TS3A4751PWR delivers lower on-resistance at the cost of dual functionality and industrial temperature range.

Availability

SN74CBT3253RGYR is available at Aetrix Electronics and suitable for industrial automation interfaces, high-speed test instrumentation, and embedded communications modules requiring stable component supply across extended temperature ranges.

Supply support for SN74CBT3253RGYR 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 50 years of innovation in high-reliability IC design.

The SN74CBT3253RGYR belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for low-latency, low-distortion signal routing in high-speed digital systems where timing precision and signal fidelity are critical.

FAQ

What is the maximum signal frequency supported by the SN74CBT3253RGYR?

The SN74CBT3253RGYR supports DC to approximately 200 MHz for analog signals and is rated for digital operation up to 1 GHz due to its 0.25 ns propagation delay and 4 pF off-capacitance. Performance depends on load capacitance and PCB layout; for reliable 100 MHz+ operation, keep trace lengths short and minimize stubs.

Can the SN74CBT3253RGYR operate with a 3.3 V supply?

No, the SN74CBT3253RGYR requires a minimum supply voltage of 4 V per the recommended operating conditions. Using 3.3 V may result in undefined switching behavior, increased on-resistance, and failure to meet TTL input thresholds. For 3.3 V systems, consider TI's TS3A4751 or similar 1.65–3.6 V alternatives.

Is the SN74CBT3253RGYR pin-compatible with other packages in the same family?

Yes, the SN74CBT3253RGYR shares identical pinout and function mapping with SN74CBT3253D (SOIC), SN74CBT3253DBR (SSOP), and SN74CBT3253PWR (TSSOP). All variants use the same 16-pin arrangement and logic behavior, enabling direct PCB footprint interchangeability where thermal and space constraints allow.

Does the SN74CBT3253RGYR require external pull-up or pull-down resistors on control inputs?

No - the SN74CBT3253RGYR has TTL-compatible inputs with guaranteed VIH ≥ 2 V and VIL ≤ 0.8 V, allowing direct connection to standard 5 V logic outputs. However, unused control inputs (S0, S1, 1OE, 2OE) must be tied to V_CC or GND to prevent floating states that could cause excessive ICC or erratic switching.

How does the exposed thermal pad on the RGY package affect soldering and reliability?

The exposed thermal pad on the SN74CBT3253RGYR improves heat dissipation (θ_JA = 39°C/W) and mechanical stability. It must be soldered to a solid copper thermal plane using appropriate stencil aperture (typically 50–70% coverage) and reflow profile. Omitting pad connection increases junction temperature by >25°C under full load and risks long-term reliability degradation.

SN74CBT3253RGYR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74CBT

Package/Case:: 16-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Multiplexer/Demultiplexer

Circuit:: 2 x 4:1

Independent Circuits:: 1

Current - Output High, Low:: -

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-VQFN (4x3.5)

SN74CBT3253RGYR FAQ

1.How can I place an order for SN74CBT3253RGYR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74CBT3253RGYR 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 SN74CBT3253RGYR reliable?

The price and inventory of SN74CBT3253RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253RGYR is usually 5 days.

3.What payment methods are accepted for SN74CBT3253RGYR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253RGYR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74CBT3253RGYR?

SN74CBT3253RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74CBT3253RGYR 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 SN74CBT3253RGYR?

For technical support, including SN74CBT3253RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253RGYR requirements.

6.How does Aetrix verify that SN74CBT3253RGYR is sourced from the original manufacturer or authorized distributors?

All SN74CBT3253RGYR 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 SN74CBT3253RGYR meets industry standards.

7.What is the process for return or replacement of SN74CBT3253RGYR?

All SN74CBT3253RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253RGYR, 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 SN74CBT3253RGYR part is unused and in its original packaging.

Return procedure for SN74CBT3253RGYR:

1.Submit a request within 90 days.

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

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