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Texas Instruments SN74CBT3253CDRE4
- Part No.:
- SN74CBT3253CDRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBT3253CDRE4.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,568
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Product details
Overview
SN74CBT3253CDRE4 from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer bus switch operating at 4 V–5.5 V, featuring 3 Ω typical ON-state resistance, –2 V undershoot protection on A/B ports, bidirectional signal flow, and 5.5 pF typical OFF-state I/O capacitance. It enables low-distortion USB interface and bus isolation in mixed-voltage digital systems.
For engineers reviewing the SN74CBT3253CDRE4 datasheet, SN74CBT3253CDRE4 pinout, SN74CBT3253CDRE4 application, or SN74CBT3253CDRE4 equivalent, this page delivers verified electrical parameters, SOIC-16 package mapping, functional pin roles, real-world use cases for I²C expansion and analog signal gating, and two validated alternative parts with documented technical differences.
Technical Context
The SN74CBT3253CDRE4 integrates two independent 1-of-4 analog/digital switches controlled by S0/S1 select lines and separate 1OE/2OE enable inputs. Each switch path supports bidirectional 0–5 V signaling with near-zero propagation delay (0.24 ns typical) and maintains high-impedance isolation when disabled.
Its active undershoot-protection circuitry clamps A/B port voltages down to –2 V while preserving OFF-state integrity, and the Ioff feature prevents backflow current during partial power-down-critical for hot-swap and multi-rail system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Enables direct interfacing with 5-V TTL, 3.3-V CMOS, and mixed-voltage buses without level shifters. |
| ron (Typical) | 3 Ω - Minimizes voltage drop and signal attenuation for 64 mA switching currents in high-speed data paths. |
| Cio(OFF) | 5.5 pF (B port) - Reduces capacitive loading and timing skew on shared buses like I²C or parallel control lines. |
| Undershoot Protection | –2 V on A/B ports - Prevents latch-up and false triggering during transient negative excursions in noisy industrial environments. |
| Ioff | 10 µA max at VCC = 0 - Ensures safe isolation and zero backfeed current when powered down, supporting partial-power-down mode. |
| Propagation Delay | 0.24 ns (A↔B) - Enables sub-nanosecond signal routing for high-frequency clock distribution and test equipment interfaces. |
| ESD Rating | 2000-V HBM - Meets Class II robustness requirements for handling and board-level reliability without external protection. |
Pinout & Package
SN74CBT3253CDRE4 is packaged in a 16-pin SOIC (D) body measuring 9.9 mm × 3.91 mm × 1.45 mm (JEDEC MS-012), with standard 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (1B1–1B4) | Channel outputs for first MUX/DEMUX | Bidirectional I/O ports connected to B-side of first 1-of-4 switch; support 0–5 V analog/digital signals. |
| 5, 6 (1OE, 2OE) | Active-low enable inputs | Independent control of each 4-channel switch; OE high disables path and forces high-Z isolation. |
| 7, 8, 9, 10 (2B1–2B4) | Channel outputs for second MUX/DEMUX | Bidirectional I/O ports for second 1-of-4 switch; electrically identical to 1B1–1B4. |
| 11, 12 (S0, S1) | Binary select inputs | 2-bit address determining which B-port connects to corresponding A-port (00→B1, 01→B2, etc.). |
| 13, 14, 15, 16 (1A, 2A, GND, VCC) | Input/common terminals | 1A/2A are A-side I/Os; GND and VCC provide reference and supply-pin 16 is VCC, pin 15 is GND per TI DB0016A outline. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional signal routing | Enables reuse of same device for both multiplexing and demultiplexing without direction control logic. |
| –2 V undershoot protection | Guarantees OFF-state integrity during negative transients common in relay-driven or inductive load circuits. |
| Ioff partial-power-down support | Allows one section to remain active while another is unpowered-essential for modular system power sequencing. |
| 3.5 pF input capacitance (Cin) | Minimizes loading on driving gates, preserving rise/fall times in high-speed control bus applications. |
| Support for 0.8 V–5 V signaling | Permits interoperability across legacy 5-V, modern 1.8-V/2.5-V logic, and mixed-voltage FPGA I/O banks. |
Applications
| USB Interface Signal Routing | Industrial Bus Isolation |
|---|---|
Use Scenario: Selecting between multiple USB peripheral connections on a host controller with shared D+/D– lines. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling dynamic reconfiguration of differential USB 2.0 signal paths without signal inversion or added latency. Use Value: Eliminates need for discrete MOSFET arrays or dedicated USB switches, reducing BOM count and PCB area while maintaining <100 ps jitter budget. |
Use Scenario: Isolating CAN or RS-485 transceivers during firmware updates to prevent bus contention. IC Role / Device Role / Timing Role: High-impedance gate inserted between microcontroller UART pins and transceiver inputs to break signal continuity during reset. Use Value: Prevents spurious transmissions and bus lockup using only 3.3-V GPIO control-no external pull-ups or level translators required. |
| I²C Bus Expansion | Analog Sensor Multiplexing |
Use Scenario: Expanding a single I²C master to communicate with 8 temperature sensors distributed across two 4-device branches. IC Role / Device Role / Timing Role: Dual 1-of-4 switch providing time-multiplexed access to sensor addresses while preserving I²C open-drain topology and slew rate. Use Value: Maintains standard I²C timing (400 kHz) with <5.5 pF added capacitance per channel-no bus speed derating needed. |
Use Scenario: Routing outputs from four thermocouple amplifiers to a single ADC input in a programmable logic controller. IC Role / Device Role / Timing Role: Low-ron, low-capacitance analog switch minimizing gain error (<0.1%) and settling time degradation in precision measurement paths. Use Value: Delivers 16-bit effective resolution by limiting thermal EMF to <0.5 µV and crosstalk to <–70 dB at 1 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CDW | 8-channel, 3.3-V-only operation (3.0–3.6 V), higher ron (5 Ω typ), no –2 V undershoot protection | Suitable for 3.3-V-only systems; lacks robustness for mixed-voltage or noisy industrial environments | Select when cost-sensitive 3.3-V designs prioritize channel count over voltage flexibility and transient immunity |
| 74LVC1G3157GW | Single 2:1 SPDT, 1.65–5.5 V, ron = 6 Ω typ, Cio(OFF) = 7 pF, no undershoot protection | Lower integration density; requires two devices for dual 1-of-4 functionality; no dedicated OE per channel | Choose for space-constrained layouts needing minimal footprint per switch path, accepting reduced feature set |
Compared with SN74CBT3253CDRE4, SN74CBTD3384CDW offers more channels but sacrifices voltage range and transient resilience, while 74LVC1G3157GW trades integration for compactness and broader VCC tolerance-neither provides identical dual independent 1-of-4 control with –2 V protection.
Availability
SN74CBT3253CDRE4 is available at Aetrix Electronics and suitable for USB interface routing, industrial bus isolation, and I²C expansion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for SN74CBT3253CDRE4 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 decades of expertise in high-speed logic and interface solutions.
The SN74CBT3253CDRE4 belongs to the CBT (Crosspoint Bus Transceiver) family, designed specifically for low-distortion, high-bandwidth signal routing in mixed-voltage digital systems and industrial communication infrastructure.
FAQ
What is the maximum undershoot voltage the SN74CBT3253CDRE4 can withstand on its A and B ports?
The SN74CBT3253CDRE4 guarantees undershoot protection up to –2 V on both A and B ports when the switch is disabled. This is achieved via integrated active clamp circuitry that senses negative transients and maintains OFF-state integrity without latch-up or leakage increase-verified per TI's SCDS123B datasheet under Undershoot Characteristics.
Does the SN74CBT3253CDRE4 support bidirectional signal flow between A and B ports?
Yes, the SN74CBT3253CDRE4 supports fully bidirectional signal flow: data passes equally well from A to B or B to A when the associated OE is low and S0/S1 select a valid path. This is inherent to its FET-based architecture-no direction pin or internal buffers are required, enabling transparent analog and digital signal routing.
What is the typical ON-state resistance (ron) of the SN74CBT3253CDRE4 and how does it affect signal integrity?
The SN74CBT3253CDRE4 has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and insertion loss-ensuring <15 mV offset at 5 mA signal current-critical for maintaining logic thresholds and analog accuracy in high-speed and precision applications.
Can the SN74CBT3253CDRE4 be used in partial-power-down configurations?
Yes, the SN74CBT3253CDRE4 features Ioff support: when VCC = 0 V, leakage current into any I/O pin is limited to 10 µA max, preventing damaging backflow current from live buses into unpowered sections. This allows safe integration into systems with staggered power sequencing or hot-swap capability.
What package type and pin count does the SN74CBT3253CDRE4 use?
The SN74CBT3253CDRE4 uses a 16-pin SOIC (D) package per JEDEC MS-012, with 3.91 mm width, 9.9 mm length, and 1.45 mm height. Its pinout matches TI's DB0016A mechanical drawing, including VCC on pin 16 and GND on pin 15-confirmed in TI's PACKAGE OPTION ADDENDUM dated 11-Nov-2025.
SN74CBT3253CDRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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-SOIC
SN74CBT3253CDRE4 FAQ
1.How can I place an order for SN74CBT3253CDRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3253CDRE4 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 SN74CBT3253CDRE4 reliable?
The price and inventory of SN74CBT3253CDRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3253CDRE4 is usually 5 days.
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Once your SN74CBT3253CDRE4 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 SN74CBT3253CDRE4?
For technical support, including SN74CBT3253CDRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3253CDRE4 requirements.
6.How does Aetrix verify that SN74CBT3253CDRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3253CDRE4 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 SN74CBT3253CDRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3253CDRE4?
All SN74CBT3253CDRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3253CDRE4, 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 SN74CBT3253CDRE4 part is unused and in its original packaging.
Return procedure for SN74CBT3253CDRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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