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Texas Instruments SN74CB3T3253DR
- Part No.:
- SN74CB3T3253DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CB3T3253DR.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
SN74CB3T3253DR from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer optimized for low-voltage bus switching and level translation between 0V–5V domains. It features bidirectional signal flow, 5Ω typical ON-state resistance, 5V-tolerant I/Os with device powered up or down, VCC-operating range of 2.3V–3.6V, and supports mixed-mode operation (e.g., 5V input → 2.5V output with 2.5V VCC). It is used in USB interface isolation and memory interleaving circuits.
For engineers reviewing the SN74CB3T3253DR datasheet, SN74CB3T3253DR pinout, SN74CB3T3253DR application, or SN74CB3T3253DR equivalent, key selection criteria include its 5V-tolerant I/O capability under partial power-down, near-zero propagation delay (≤0.25 ns at 3.3V), rail-to-rail voltage translation tracking VCC, and SOIC-16 package compatibility with industrial and portable equipment designs.
Technical Context
The SN74CB3T3253DR implements two independent 1-of-4 analog switches controlled by active-low OE inputs (1OE, 2OE) and 2-bit binary select lines (S0, S1), enabling bidirectional data routing between common A ports and four B-channel I/Os per section. Each switch uses low-threshold FETs with gate drive referenced to VCC, delivering 5Ω rON and <5pF off-capacitance on B-side I/Os.
Its Ioff specification ensures no backflow current during partial power-down, while undershoot clamp diodes on all I/Os and control inputs protect against transient overvoltage. The device operates across –40°C to +85°C with guaranteed 20μA max ICC and ±128mA per-channel ON-state current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - Enables interoperability across 2.5V and 3.3V logic domains without external level shifters. |
| rON (Typ) | 5Ω - Minimizes insertion loss and signal distortion in high-speed digital buses up to 100+ MHz. |
| I/O Voltage Range | 0V–5.5V - Supports 5V-tolerant signaling regardless of VCC state, critical for hot-swap and mixed-voltage system interfaces. |
| Cio(OFF) (B port) | 5pF typ - Reduces capacitive loading on shared buses, preserving signal integrity and timing margins. |
| tpd (max) | 0.25ns at 3.3V - Enables sub-nanosecond propagation delay for high-throughput multiplexing in DDR, USB, and memory applications. |
| Ioff Leakage | ±10μA - Ensures robust isolation and zero-current backfeed when VCC = 0V, satisfying JESD78 latch-up immunity requirements. |
| ESD Rating (HBM) | ±2000V - Meets Class II ESD robustness for assembly and field operation without additional protection circuitry. |
Pinout & Package
SN74CB3T3253DR is packaged in a 16-pin SOIC (D) package measuring 9.9mm × 6mm, with standard 1.27mm pitch and surface-mount compatibility. Pin 8 is GND and Pin 16 is VCC; both OE and select inputs are active-low and TTL/CMOS-compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent channel gating: drives associated 1-of-4 switch ON/OFF; tied to VCC via pullup for power-up high-Z safety. |
| S0, S1 | Binary select inputs | Determines which of four B-port channels connects to A port (L/L → B1, L/H → B2, H/L → B3, H/H → B4). |
| 1A, 2A | Common I/O ports | Bidirectional data path hubs - connect to system bus or controller; support 0V–5V signaling independent of VCC. |
| 1B1–1B4, 2B1–2B4 | Channel I/O terminals | Four per section; each provides 5V-tolerant, low-capacitance connection to peripherals, memory banks, or USB PHYs. |
| GND (Pin 8), VCC (Pin 16) | Power supply reference | Single-supply operation only; bypass capacitor (0.1µF) required adjacent to VCC for noise suppression and stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation tracking VCC | Output levels follow VCC (e.g., 5V input → 2.5V output with 2.5V VCC), eliminating need for external translators in multi-rail systems. |
| 5V-tolerant I/Os with VCC = 0V | Enables true hot-swap capability and safe operation during power sequencing - no damage or leakage when unpowered. |
| Ioff partial-power-down protection | Prevents destructive back-current flow during system sleep or brownout, meeting JESD78 latch-up immunity (>250mA). |
| Bidirectional, near-zero-delay switching | Supports full-duplex data flow with ≤0.25ns tpd at 3.3V - suitable for USB 2.0, DDR address/control muxing, and real-time bus arbitration. |
| Low OFF-state capacitance (5pF) | Minimizes crosstalk and timing skew on shared buses, especially critical in high-density PCB layouts with tight trace spacing. |
Applications
| USB Interface Isolation | Memory Interleaving |
|---|---|
|
Use Scenario: Isolating USB D+/D− lines between host controller and peripheral during enumeration or suspend/resume cycles. IC Role / Device Role / Timing Role: Bidirectional 1-of-4 analog switch providing 5V-tolerant, low-rON path with sub-ns delay to preserve USB 2.0 signal integrity. Use Value: Eliminates need for discrete level shifters and enables seamless voltage domain bridging between 3.3V controller and 5V legacy peripherals. |
Use Scenario: Dynamically routing address/data lines between two memory banks (e.g., SRAM and Flash) sharing a common microcontroller bus. IC Role / Device Role / Timing Role: Dual-channel bus multiplexer enabling time-multiplexed access with minimal propagation delay and no bus contention. Use Value: Increases effective memory bandwidth by 2× through interleaved access while maintaining strict setup/hold timing with 5Ω rON. |
| Level Translation Hub | Bus Isolation in Portable Equipment |
|
Use Scenario: Translating control signals (e.g., reset, chip select) between 5V FPGA I/O banks and 2.5V ASIC subsystems. IC Role / Device Role / Timing Role: Voltage-tracking FET switch translating logic levels without directionality constraints or added latency. Use Value: Supports mixed-voltage SoC integration with deterministic DC output levels (VOH/VOL) tracked to VCC, reducing BOM count. |
Use Scenario: Enabling/disabling communication paths (e.g., UART, I²C) to sensors or displays in battery-powered handheld devices during low-power modes. IC Role / Device Role / Timing Role: Low-leakage (±10μA Ioff), high-isolation switch that maintains signal integrity while drawing <20μA quiescent current. Use Value: Extends battery life by cutting off unused bus segments without compromising wake-up responsiveness or signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3253DR | Lower VCC range (2.3V–3.6V same), but rated for 3.3V-only operation; no 2.5V VCC support specified. | Limited to 3.3V systems; lacks explicit 2.5V translation capability and 5V-tolerant I/O validation at 2.5V VCC. | Choose SN74CBTLV3253DR only if operating strictly at 3.3V and cost sensitivity outweighs mixed-voltage flexibility. |
| TS3A226AEYFFR | Higher rON (8Ω typ), wider VCC range (1.65V–3.6V), but no 5V-tolerant I/O - max VI/O = VCC + 0.3V. | Not suitable for 5V signal domains; requires external clamping or translators for legacy 5V interface support. | Prefer TS3A226AEYFFR only in ultra-low-voltage (1.8V/2.5V) portable designs where 5V tolerance is unnecessary. |
Compared with SN74CBTLV3253DR and TS3A226AEYFFR, the SN74CB3T3253DR uniquely delivers verified 5V-tolerant I/O operation across its full 2.5V–3.3V VCC range, enabling drop-in replacement in mixed-voltage USB, memory, and industrial control systems without redesigning level-shifting networks.
Availability
SN74CB3T3253DR is available at Aetrix Electronics and suitable for USB interface isolation, memory interleaving, and bus isolation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74CB3T3253DR 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 SN74CB3T3253DR belongs to TI's CB3T bus switch family, engineered for low-latency, voltage-agnostic signal routing in mixed-voltage digital systems - particularly targeting USB, memory, and portable equipment design challenges.
FAQ
What voltage levels can SN74CB3T3253DR translate between?
The SN74CB3T3253DR supports bidirectional voltage translation from 5V down to 2.5V or 3.3V outputs depending on VCC: with 2.5V VCC, it translates 5V/3.3V inputs to 2.5V outputs; with 3.3V VCC, it translates 5V inputs to 3.3V outputs. All I/Os remain 5V-tolerant regardless of VCC state, including during power-down.
Does SN74CB3T3253DR support partial power-down operation?
Yes, the SN74CB3T3253DR includes Ioff circuitry that disables current backflow when VCC = 0V, ensuring safe isolation and preventing damage during hot-swap or power sequencing events. This feature is fully characterized per JESD78 and supports robust partial-power-down mode in industrial and portable systems.
What is the maximum signal frequency supported by SN74CB3T3253DR?
The SN74CB3T3253DR does not specify a hard maximum frequency, but its 5Ω rON and ≤5pF Cio(OFF) yield RC-limited bandwidth exceeding 100 MHz in typical PCB layouts. Measured tpd ≤0.25ns at 3.3V confirms suitability for USB 2.0 (480 Mbps), DDR address/control buses, and other high-speed digital multiplexing tasks.
Can SN74CB3T3253DR be used with 1.8V logic systems?
No - the SN74CB3T3253DR requires VCC ≥2.3V and is not characterized for reliable operation below that threshold. While its I/Os accept 1.8V inputs (as part of 0V–5V signaling support), output voltage translation is defined only for VCC = 2.5V or 3.3V; 1.8V VCC operation is outside datasheet specifications.
Is SN74CB3T3253DR pin-compatible with older TI bus switches like QS3253?
Yes, the SN74CB3T3253DR is functionally equivalent to the QS3253 and shares identical pinout, package (SOIC-16), and electrical behavior - including 5Ω rON and 5V-tolerant I/Os. It serves as a direct drop-in replacement with enhanced ESD ratings (±2000V HBM) and extended temperature range (–40°C to +85°C).
SN74CB3T3253DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- 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:
- 16-SOIC
SN74CB3T3253DR FAQ
1.How can I place an order for SN74CB3T3253DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3253DR 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 SN74CB3T3253DR reliable?
The price and inventory of SN74CB3T3253DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3253DR is usually 5 days.
3.What payment methods are accepted for SN74CB3T3253DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3T3253DR transactions.
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4.How is shipping managed for SN74CB3T3253DR?
SN74CB3T3253DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3253DR 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 SN74CB3T3253DR?
For technical support, including SN74CB3T3253DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3253DR requirements.
6.How does Aetrix verify that SN74CB3T3253DR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3253DR 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 SN74CB3T3253DR meets industry standards.
7.What is the process for return or replacement of SN74CB3T3253DR?
All SN74CB3T3253DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3253DR, 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 SN74CB3T3253DR part is unused and in its original packaging.
Return procedure for SN74CB3T3253DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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