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Texas Instruments SN74CB3T3253DBQR
- Part No.:
- SN74CB3T3253DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CB3T3253DBQR.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,241
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Product details
Overview
SN74CB3T3253DBQR from Texas Instruments is a dual 1-of-4 FET multiplexer/demultiplexer bus switch supporting bidirectional 5V-tolerant level shifting across 2.5V/3.3V domains, with 5Ω typical ON-state resistance, 5pF typical OFF-state I/O capacitance, and operation from –40°C to +85°C. It enables mixed-mode signal routing in USB interfaces and memory interleaving systems.
For engineers reviewing the SN74CB3T3253DBQR datasheet, SN74CB3T3253DBQR pinout, SN74CB3T3253DBQR application, or SN74CB3T3253DBQR equivalent, key selection criteria include VCC range (2.3V–3.6V), Ioff partial-power-down support, 5V-tolerant I/Os with device powered up or down, near-zero propagation delay (<0.25 ns at 3.3V), and SSOP-16 package compatibility.
Technical Context
The SN74CB3T3253DBQR implements two independent 1-of-4 analog switches controlled by active-low OE and 2-bit S1/S0 select inputs, enabling bidirectional data flow between common A ports and four B-channel I/Os per section. Each switch uses low-threshold FETs with rail-to-rail voltage translation tracking VCC.
It supports mixed-mode operation via output voltage translation that scales with VCC: 5V inputs translate to 3.3V outputs at 3.3V VCC, and to 2.5V outputs at 2.5V VCC. The Ioff feature prevents backflow current during partial power-down, ensuring isolation when VCC = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables use in 2.5V and 3.3V logic systems with margin for supply variation. |
| ON-State Resistance (rON) | 5Ω typ - Minimizes insertion loss and signal distortion in high-speed digital paths. |
| I/O Capacitance (CIO(OFF)) | 5pF typ - Reduces capacitive loading on buses, preserving signal integrity and timing margins. |
| Propagation Delay (tpd) | 0.25 ns max at 3.3V - Supports >1 GHz switching without measurable delay penalty. |
| 5V Tolerance | Full I/O tolerance with VCC powered up or down - Allows safe interfacing with legacy 5V peripherals in mixed-voltage systems. |
| IOFF Leakage | ±10 µA max - Ensures robust channel isolation during partial power-down mode. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and portable equipment environments. |
Pinout & Package
SN74CB3T3253DBQR is housed in a 16-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 4.9 mm × 6 mm body size, and moisture sensitivity level (MSL) 2 (260°C peak reflow, 1-year floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 1-of-4 mux section; high = high-Z isolation, low = enabled path. |
| S1, S0 | Binary select inputs | Determine which of four B-port channels connects to the common A port (L/L → B1, H/H → B4). |
| 1A, 2A | Common I/O ports | Bidirectional data hubs for respective mux sections; connect to system buses or controllers. |
| 1B1–1B4, 2B1–2B4 | Channel I/O terminals | Four bidirectional data paths per section; tolerate 0V–5.5V signals regardless of VCC state. |
| VCC | Supply voltage input | Power source for internal logic and switch biasing; sets translation reference for all I/Os. |
| GND | Ground reference | Return path for all internal circuitry and I/O current; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage translation tracking VCC | Enables seamless 5V→3.3V or 5V/3.3V→2.5V level shifting without external components. |
| 5V-tolerant I/Os with VCC = 0V | Permits hot-plug operation and safe interface with unpowered subsystems or legacy peripherals. |
| IOFF partial-power-down protection | Blocks damaging back-current flow when VCC is removed, preserving system-level power domain integrity. |
| Near-zero propagation delay | Sub-nanosecond tpd ensures timing-critical applications (e.g., USB 2.0, memory arbitration) remain unaffected. |
| Low 5pF OFF-state capacitance | Minimizes bus loading and crosstalk in high-density routing, critical for signal integrity in compact PCBs. |
Applications
| USB Interface | Memory Interleaving |
|---|---|
|
Use Scenario: Routing differential D+/D− signals between host controller and multiple peripheral ports while maintaining 5V-tolerant signaling. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling dynamic port selection without signal inversion or added latency. Use Value: Eliminates need for discrete level shifters and reduces BOM count while preserving USB 2.0 timing compliance. |
Use Scenario: Alternating access between two memory banks sharing a common data bus in low-power embedded systems. IC Role / Device Role / Timing Role: Low-rON, low-CIO bus switch providing glitch-free bank isolation during address decode transitions. Use Value: Prevents bus contention and reduces switching noise, improving memory read/write reliability at 100+ MHz clock rates. |
| Bus Isolation | Level Translation Bridge |
|
Use Scenario: Isolating debug/test interfaces from main system bus during firmware updates or diagnostics. IC Role / Device Role / Timing Role: High-impedance gate controlled by processor GPIO, activated only during test mode. Use Value: Prevents unintended signal coupling and ensures deterministic bus states during maintenance operations. |
Use Scenario: Connecting 5V sensor outputs to a 2.5V microcontroller ADC input while maintaining full-scale accuracy. IC Role / Device Role / Timing Role: Voltage-translating switch with rON stable across VCC range, avoiding gain error from series resistance. Use Value: Delivers precise DC-coupled signal transfer without external resistive dividers or active buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3253DBQR | Lower 3Ω rON, 2.3V–3.6V VCC, identical pinout and function | Better performance in ultra-low-loss paths (e.g., high-frequency DDR traces), same thermal profile | Preferred when minimizing insertion loss is critical; otherwise direct functional replacement. |
| PI3CH400LE | 4-channel single-pole switch, 3.3V-only VCC (2.7–3.6V), 6Ω rON, no Ioff | Lacks 5V tolerance and partial-power-down capability; requires external clamping for 5V signals | Select only for 3.3V-only systems where Ioff and 5V tolerance are unnecessary. |
Compared with SN74CB3T3253DBQR, SN74CBTLV3253DBQR offers lower conduction loss but identical integration and power-down safety, while PI3CH400LE sacrifices robustness for cost in single-voltage designs.
Availability
SN74CB3T3253DBQR is available at Aetrix Electronics and suitable for USB interface design, memory interleaving architectures, and bus isolation circuits requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CB3T3253DBQR 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 SN74CB3T3253DBQR belongs to TI's CB3T bus switch family, engineered for low-latency, voltage-agnostic signal routing in mixed-voltage digital systems such as portable computing and industrial control.
FAQ
What is the maximum data rate supported by the SN74CB3T3253DBQR?
The SN74CB3T3253DBQR does not specify a maximum data rate in its datasheet, but its 0.25 ns propagation delay and 5pF OFF-state capacitance support signal integrity up to 1+ GHz. Real-world bandwidth depends on PCB layout, termination, and load; for USB 2.0 (480 Mbps) or DDR1/2 address/control lines, it operates well within specification limits. SN74CB3T3253DBQR maintains sub-nanosecond timing consistency across temperature and voltage ranges.
Does the SN74CB3T3253DBQR require external pull-up or pull-down resistors on control pins?
No external pull-up or pull-down resistors are required on S0, S1, or OE pins of the SN74CB3T3253DBQR under normal operation, as its CMOS inputs have defined VIH/VIL thresholds across VCC (2.3V–3.6V). However, TI recommends tying OE to VCC via a pullup resistor during power-up/power-down to guarantee high-impedance state until control logic stabilizes. SN74CB3T3253DBQR's internal structure avoids floating-input latch-up risks.
Can the SN74CB3T3253DBQR be used with a 1.8V VCC supply?
No - the SN74CB3T3253DBQR is not rated for 1.8V VCC operation. Its recommended operating range is strictly 2.3V to 3.6V, and absolute maximum ratings do not extend below 2.3V. Attempting 1.8V operation may result in undefined switching behavior, increased rON, or failure to meet timing specs. For 1.8V systems, consider TI's SN74CBT3244 or compatible 1.8V-optimized switches. SN74CB3T3253DBQR requires minimum 2.3V to ensure proper FET turn-on and translation accuracy.
How does the Ioff feature protect the SN74CB3T3253DBQR during partial power-down?
The Ioff feature in the SN74CB3T3253DBQR disables internal switch conduction paths when VCC = 0V, limiting I/O leakage to ±10 µA even with 5.5V applied to B-ports. This prevents back-current from flowing into a powered-down VCC rail, protecting upstream regulators and avoiding latch-up in adjacent ICs. SN74CB3T3253DBQR maintains full 5V tolerance and isolation integrity regardless of VCC state - a key requirement for hot-swap and modular power architectures.
Is the SN74CB3T3253DBQR pin-compatible with the QS3253?
Yes - the SN74CB3T3253DBQR is functionally equivalent to the QS3253 and shares identical pinout, electrical characteristics, and package dimensions in SSOP-16. TI explicitly states this equivalence in the datasheet's Feature Description section. SN74CB3T3253DBQR provides enhanced ESD ratings (2000V HBM) and updated thermal specs over legacy QS3253, but requires no PCB or firmware changes for drop-in replacement in existing designs.
SN74CB3T3253DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-SSOP (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-SSOP
SN74CB3T3253DBQR FAQ
1.How can I place an order for SN74CB3T3253DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3253DBQR 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 SN74CB3T3253DBQR reliable?
The price and inventory of SN74CB3T3253DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3253DBQR is usually 5 days.
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SN74CB3T3253DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3253DBQR 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 SN74CB3T3253DBQR?
For technical support, including SN74CB3T3253DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3253DBQR requirements.
6.How does Aetrix verify that SN74CB3T3253DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3253DBQR 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 SN74CB3T3253DBQR meets industry standards.
7.What is the process for return or replacement of SN74CB3T3253DBQR?
All SN74CB3T3253DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3253DBQR, 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 SN74CB3T3253DBQR part is unused and in its original packaging.
Return procedure for SN74CB3T3253DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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