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Texas Instruments SN74CBT3253DBRG4
- Part No.:
- SN74CBT3253DBRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT3253DBRG4.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,553
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Product details
Overview
SN74CBT3253DBRG4 from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer with TTL-compatible inputs, 5 Ω typical on-state resistance at VCC = 4.5 V, 0.25 ns propagation delay at 5 V, and operation across −40°C to 85°C. It routes bidirectional data between one common port (A) and four selectable B ports per channel in high-speed digital logic, bus switching, and signal routing applications.
For engineers reviewing the SN74CBT3253DBRG4 datasheet, SN74CBT3253DBRG4 pinout, SN74CBT3253DBRG4 application, or SN74CBT3253DBRG4 equivalent, key selection criteria include its low on-resistance, sub-nanosecond switching, dual independent channel control via S0/S1 and OE pins, and SSOP-16 package compatibility with dense PCB layouts.
Technical Context
The SN74CBT3253DBRG4 implements two independent analog/digital bidirectional switches using NMOS pass-transistor architecture, each selecting one of four B terminals (1B1–1B4 or 2B1–2B4) to connect to its respective A terminal (1A or 2A). Channel selection is controlled by two binary address lines (S1, S0) and separate active-low output-enable inputs (1OE, 2OE).
Each switch operates with rail-to-rail signal handling (−0.5 V to 7 V), supports up to 128 mA continuous channel current, and exhibits minimal charge injection (< 10 pC) and low off-capacitance (4 pF). The device requires no external biasing and maintains signal integrity for both digital and low-voltage analog signals within its specified voltage and temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage systems without level-shifting. |
| ron (Typ) | 5 Ω at VCC = 4.5 V - Minimizes voltage drop and power loss during signal routing, critical for low-distortion bus switching. |
| tpd (Max) | 0.35 ns at VCC = 4 V - Enables sub-nanosecond timing margins in high-speed parallel interfaces and clock distribution paths. |
| IOFF (Max) | 4 pF at OE = VCC - Reduces crosstalk and loading on unselected channels, preserving signal fidelity in multi-channel routing. |
| VIH/VIL | 2 V / 0.8 V - Matches standard TTL logic thresholds, allowing direct interfacing with legacy 5-V microcontrollers and FPGAs. |
| Operating Temp | −40°C to +85°C - Qualified for industrial-grade reliability in embedded controllers, test equipment, and communications hardware. |
| ICC (Max) | 3 μA - Ultra-low quiescent current enables use in power-sensitive applications without compromising speed. |
Pinout & Package
SN74CBT3253DBRG4 is housed in a 16-pin SSOP (Shrink Small-Outline Package) with 0.65 mm lead pitch, 7.4 mm × 5.3 mm body size, and 2.0 mm maximum height - optimized for space-constrained industrial PCBs requiring fine-pitch assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low enable for Channel 1 | Drives entire 1A–1B1–1B4 path into high-impedance state when high; required for independent channel isolation. |
| S1, S0 | Binary address inputs for both channels | Selects one of four B ports per channel simultaneously (e.g., S1=H/S0=L → 1B3/2B3); shared control reduces GPIO overhead. |
| 1A, 2A | Common input/output terminals | Bidirectional ports supporting data flow either direction; no internal direction control needed. |
| 1B1–1B4, 2B1–2B4 | Channel-specific output/input terminals | Four selectable endpoints per channel; all pins support full rail-to-rail analog/digital signal pass-through. |
| VCC, GND | Power supply and reference | Single 5-V supply simplifies power design; decoupling near Pin 8 (GND) and Pin 16 (VCC) is mandatory for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1-of-4 switching | Enables simultaneous but isolated routing of two data streams (e.g., dual UART lines or I²C buses) using shared address lines. |
| TTL-compatible control inputs | Eliminates need for external level shifters when driven by legacy 5-V logic families, reducing BOM count and layout complexity. |
| Low on-state resistance (5 Ω typ) | Maintains signal amplitude integrity for 3.3-V and 5-V signals, minimizing rise/fall time degradation in high-frequency data paths. |
| Sub-nanosecond propagation delay | Supports >1 GHz effective switching rates in burst-mode applications such as memory address multiplexing or FPGA I/O expansion. |
| Rail-to-rail analog/digital capability | Allows transparent routing of DC-coupled signals including clock edges, reset pulses, and low-level analog sensor outputs without distortion. |
Applications
| PCI Express Lane Multiplexing | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Dynamically reassigning PCIe lanes between two host processors and a shared peripheral slot in modular compute systems. IC Role / Device Role / Timing Role: Bidirectional lane selector that preserves signal integrity and timing margins while enabling hot-swap-aware reconfiguration. Use Value: Enables flexible topology changes without physical rewiring or FPGA reprogramming, leveraging sub-0.4 ns tpd and 5 Ω ron to meet PCIe Gen1 jitter budgets. | Use Scenario: Consolidating multiple sensor inputs (thermocouples, encoders, digital I/O) onto a single microcontroller ADC or GPIO bank in factory automation hardware. IC Role / Device Role / Timing Role: Analog/digital signal router that handles mixed-signal sources with minimal added noise or offset. Use Value: Reduces MCU pin count requirements by 4× per channel while maintaining <1 mV error contribution due to low ron and charge injection. |
| Legacy Bus Interface Translation | Test Equipment Signal Routing |
Use Scenario: Interfacing modern 3.3-V SoCs with legacy 5-V parallel buses (e.g., ISA, GPIB) in diagnostic and instrumentation platforms. IC Role / Device Role / Timing Role: Level-agnostic bidirectional bridge that passes data and handshaking signals without direction control logic. Use Value: Eliminates discrete MOSFET translators and associated pull-up networks, cutting board area by >30% and improving setup/hold timing predictability. | Use Scenario: Automated test fixtures requiring dynamic reconfiguration of stimulus/response paths between DUT pins and measurement instruments. IC Role / Device Role / Timing Role: High-fidelity signal path selector with nanosecond-scale settling and minimal capacitive loading. Use Value: Supports <100 ps edge fidelity for high-speed digital pattern generation and ensures <0.5% amplitude error in 10-MHz analog waveform routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384DBR | 8-channel configuration, higher ICC (10 μA), same SSOP-16 package, 6.5 Ω ron | Designed for wider bus widths (e.g., 8-bit data paths); not pin-compatible due to different pin mapping and enable structure. | Select when expanding to octal routing with identical footprint constraints but accept slightly higher on-resistance and static current. |
| 74LVC1G3157DCKR | Single 2:1 SPDT switch, SC70-6 package, 6 Ω ron, 3.3-V only (1.65–5.5 V), lower drive strength (64 mA) | Targeted at low-pin-count, low-power portable designs; lacks dual 1-of-4 functionality and TTL input compatibility. | Choose for space-limited consumer electronics where only one 2:1 path is needed and 3.3-V operation suffices. |
Compared with SN74CBT3253DBRG4, SN74CBTD3384DBR offers greater channel density but sacrifices pin compatibility and adds static current, while 74LVC1G3157DCKR trades dual 1-of-4 flexibility for ultra-small size and lower voltage operation - making SN74CBT3253DBRG4 optimal for industrial 5-V systems needing precise dual-channel routing with minimal timing impact.
Availability
SN74CBT3253DBRG4 is available at Aetrix Electronics and suitable for industrial PLCs, automated test equipment, legacy bus interface modules, and high-speed digital signal routing applications requiring stable component supply and long-term manufacturability assurance.
Supply support for SN74CBT3253DBRG4 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-reliability components.
The SN74CBT3253DBRG4 belongs to TI's CBT (Crosspoint Bus Switch) family, engineered specifically for low-latency, bidirectional signal routing in industrial and communications infrastructure where timing precision and signal fidelity are non-negotiable.
FAQ
What is the maximum signal voltage range supported by the SN74CBT3253DBRG4?
The SN74CBT3253DBRG4 supports an input voltage range of −0.5 V to 7 V on all I/O pins, enabling rail-to-rail analog and digital signal pass-through. This includes compatibility with 3.3-V, 5-V, and mixed-voltage systems, provided VCC is maintained within its 4 V to 5.5 V operating range. The device does not require external clamping diodes for signals within this window.
Does the SN74CBT3253DBRG4 require external pull-up or pull-down resistors on its control inputs?
No, the SN74CBT3253DBRG4 does not require external pull-up or pull-down resistors on S0, S1, 1OE, or 2OE inputs under normal operation. Its TTL-compatible inputs have defined VIH (≥2 V) and VIL (≤0.8 V) thresholds, and TI's datasheet explicitly states that unused control inputs must be held at VCC or GND - achievable directly via MCU GPIO or fixed supply connections without resistive networks.
Can the SN74CBT3253DBRG4 be used for analog signal switching, such as audio or sensor outputs?
Yes, the SN74CBT3253DBRG4 is suitable for low-frequency analog signal routing, including audio paths and DC-coupled sensor outputs, due to its bidirectional operation, low on-resistance (5 Ω typ), low charge injection (<10 pC), and 4 pF off-capacitance. It preserves signal integrity for bandwidths up to ~10 MHz; however, it is not characterized for THD or SNR, so system-level validation is recommended for precision analog applications.
What is the thermal performance of the SN74CBT3253DBRG4 in its SSOP-16 package?
The SN74CBT3253DBRG4 in the DB package has a junction-to-ambient thermal impedance (θJA) of 82°C/W, measured per JESD 51-7. Under worst-case conditions (5.5 V, full channel loading), power dissipation remains below 100 mW, resulting in a junction temperature rise of <8.2°C above ambient - well within safe limits for industrial operation without forced airflow or heatsinking.
Is the SN74CBT3253DBRG4 pin-compatible with other members of the SN74CBT3253 family?
Yes, the SN74CBT3253DBRG4 shares identical pinout and electrical behavior with all SN74CBT3253 variants in SSOP-16 (DB) packaging, including SN74CBT3253DBR and SN74CBT3253DBR.A. Differences are limited to tape-and-reel packaging, marking, and lifecycle status - not functional or mechanical compatibility. Always verify top-side marking (CU253) and ordering part number suffixes before substitution.
SN74CBT3253DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
SN74CBT3253DBRG4 FAQ
1.How can I place an order for SN74CBT3253DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253DBRG4 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 SN74CBT3253DBRG4 reliable?
The price and inventory of SN74CBT3253DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253DBRG4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3253DBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3253DBRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3253DBRG4?
SN74CBT3253DBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3253DBRG4 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 SN74CBT3253DBRG4?
For technical support, including SN74CBT3253DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253DBRG4 requirements.
6.How does Aetrix verify that SN74CBT3253DBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253DBRG4 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 SN74CBT3253DBRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3253DBRG4?
All SN74CBT3253DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253DBRG4, 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 SN74CBT3253DBRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3253DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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