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Texas Instruments SN74CB3Q3253PWRE4
- Part No.:
- SN74CB3Q3253PWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q3253PWRE4.pdf
- Description:
- IC MUX/DEMUX 2 X 4:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
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Product details
Overview
SN74CB3Q3253PWRE4 from Texas Instruments is a dual 1-of-4 FET multiplexer–demultiplexer bus switch optimized for high-bandwidth digital signal routing. It supports rail-to-rail 0–5-V switching at 2.5-V/3.3-V VCC, delivers 4 Ω typical ON-state resistance, 500 MHz bandwidth, and bidirectional near-zero-delay data flow-enabling low-distortion USB interface and video broadcast signal gating.
For engineers reviewing the SN74CB3Q3253PWRE4 datasheet, SN74CB3Q3253PWRE4 pinout, SN74CB3Q3253PWRE4 application, or SN74CB3Q3253PWRE4 equivalent, key selection criteria include 5-V tolerant I/Os with powered-down operation, Ioff-enabled partial-power-down mode, 3.5 pF typical OFF-state I/O capacitance, and TSSOP-16 package compatibility for space-constrained PCB layouts.
Technical Context
The SN74CB3Q3253PWRE4 integrates two independent 1-of-4 analog/digital multiplexers, each with active-low output enables (1OE, 2OE) and dual select lines (S0, S1) controlling four bidirectional B-port channels per A-port. Its charge-pump-enhanced FET architecture elevates gate voltage to maintain flat ron across 2.3–3.6 V VCC, enabling consistent propagation delay (0.12–0.18 ns) and rail-to-rail signal integrity.
Each channel operates with 5-V tolerant I/Os regardless of VCC state, supported by undershoot clamp diodes and Ioff protection that blocks backflow current during partial power-down. The device achieves 20 MHz maximum switching frequency on control inputs while maintaining Cio(OFF) ≤ 4.5 pF on B ports and ≤11 pF on A ports-critical for minimizing capacitive loading in high-speed buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables interoperability with 2.5-V and 3.3-V logic domains without level shifters. |
| ron (Typical) | 4 Ω at VCC = 2.5 V - Ensures minimal insertion loss and signal attenuation in high-frequency data paths. |
| Bandwidth | Up to 500 MHz - Supports full-rate USB 2.0 (480 Mbps), PCIe Gen1, and HD video signal routing. |
| Cio(OFF) | 3.5 pF (B port), 8–11 pF (A port) - Reduces crosstalk and maintains signal fidelity in dense parallel bus environments. |
| Propagation Delay | 0.12–0.18 ns - Enables sub-nanosecond timing alignment critical for synchronous multi-channel systems. |
| Ioff Support | Yes - Prevents damaging current flow when VCC = 0 V, allowing safe hot-insertion and mixed-voltage board designs. |
| ESD Rating | 2000-V HBM, 1000-V CDM - Meets industrial-grade robustness requirements without external protection. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm body size), thermally enhanced with exposed thermal pad; RoHS-compliant, NIPDAU lead finish, MSL Level-1 (260°C, unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low enable for Channel 1 | Drives all four 1Bx switches; ties to GND via pull-down or microcontroller GPIO for channel activation. |
| S1, S0 | Binary select inputs for both muxes | Set 1A↔1Bx or 2A↔2Bx path (L/L = B1, L/H = B2, H/L = B3, H/H = B4); TTL/CMOS compatible. |
| 1A, 2A | Common input/output ports | Bidirectional data hubs-connect to host controller or processor bus; support 0–5-V swing regardless of VCC. |
| 1B1–1B4, 2B1–2B4 | Channel I/O terminals | Four independent bidirectional paths per mux; low Cio(OFF) isolates inactive channels from signal integrity degradation. |
| VCC | Power supply | 2.3–3.6 V only; requires 0.1-µF bypass capacitor placed adjacent to Pin 16 for noise suppression. |
| GND | Reference ground | Single ground plane connection; critical for stable ron and ESD performance-must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0–5-V switching | Operates with 3.3-V VCC to pass 5-V signals intact-eliminates need for external level translators in mixed-voltage systems. |
| 5-V tolerant I/Os (powered up/down) | Withstands 5.5-V I/O stress even when VCC = 0 V-enables safe interconnection between live and unpowered subsystems. |
| Low and flat ON-state resistance | ron = 4 Ω typical, <10 Ω max over full VCC/temperature range-minimizes voltage drop and timing skew across channels. |
| Bidirectional near-zero propagation delay | tpd = 0.12–0.18 ns-preserves signal edge integrity for high-speed serial and parallel interfaces without added latency. |
| Ioff partial-power-down protection | Blocks >99% of backflow current when VCC = 0 V-prevents bus contention and latch-up during hot-swap or power sequencing. |
Applications
| USB 2.0 Signal Switching | Video Broadcast Signal Routing |
|---|---|
Use Scenario: Selecting between two USB 2.0 upstream ports in a docking station or multi-host peripheral. IC Role / Device Role / Timing Role: Bidirectional analog switch routing D+/D− differential pairs with <0.2 ns skew and 500 MHz bandwidth. Use Value: Maintains USB 2.0 eye diagram integrity and full 480 Mbps throughput without signal degradation or protocol retries. |
Use Scenario: Multiplexing SDI or HDMI auxiliary data channels in IP-based multi-format video transcoders. IC Role / Device Role / Timing Role: Dual 1-of-4 mux isolating timing-critical ancillary data streams (e.g., VANC/HANC) from main video path. Use Value: 3.5 pF B-port capacitance prevents jitter accumulation and preserves SMPTE ST 292/425 compliance. |
| Differential Bus Isolation | Low-Distortion Analog Gating |
Use Scenario: Enabling/disabling LVDS or RSDS links between FPGA and display interface ICs in portable displays. IC Role / Device Role / Timing Role: High-bandwidth, low-capacitance switch providing channel enable/disable with <1 ns transition time. Use Value: Flat ron and symmetric I/O structure preserve differential impedance matching and minimize common-mode noise. |
Use Scenario: Gating audio clock or reference signals in professional audio mixers with multiple sample-rate domains. IC Role / Device Role / Timing Role: Low-distortion analog switch passing 10–100 MHz clock harmonics with <0.01% THD+N. Use Value: 4 Ω ron and rail-to-rail capability prevent amplitude clipping and duty-cycle distortion in precision timing paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3253PWR | No charge pump; ron = 6 Ω typical, max 5-V tolerance only when powered; no Ioff. | Lacks powered-down 5-V tolerance and partial-power-down safety-unsuitable for hot-swap or mixed-power systems. | Choose only if cost sensitivity outweighs robustness requirements and VCC remains always active. |
| TS3A226AEYFFR | Single-supply 1.65–3.6 V; ron = 0.7 Ω typical; 5-V tolerant I/Os; integrated ESD (±8 kV HBM); smaller 16-pin UQFN. | Higher bandwidth (800 MHz), lower ron, but lacks dual independent OE controls-requires shared enable logic. | Prefer for ultra-low-loss, space-constrained designs where independent channel control is not required. |
Compared with SN74CB3Q3253PWRE4, SN74CBT3253PWR offers lower cost but sacrifices powered-down I/O tolerance and Ioff protection, while TS3A226AEYFFR delivers superior ron and bandwidth in a smaller package but removes per-channel output enables-making SN74CB3Q3253PWRE4 optimal for independent dual-mux control in industrial and broadcast systems.
Availability
SN74CB3Q3253PWRE4 is available at Aetrix Electronics and suitable for USB interface design, video broadcast equipment, differential signal isolation, and low-distortion analog gating requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CB3Q3253PWRE4 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 signal integrity and industrial-grade reliability.
The SN74CB3Q3253 product line targets high-bandwidth digital and analog signal routing in communications infrastructure, broadcast video, and computing-designed specifically for low-distortion, rail-to-rail, 5-V-tolerant bus switching under dynamic power conditions.
FAQ
What is the maximum operating frequency supported by the SN74CB3Q3253PWRE4?
The SN74CB3Q3253PWRE4 supports up to 500 MHz bandwidth on its data path, verified under load conditions with 30 pF capacitance and 50 Ω source impedance. This enables full-rate USB 2.0 (480 Mbps) and HD-SDI signal routing without degradation. Control inputs operate up to 20 MHz, sufficient for fast channel selection in real-time systems.
Does the SN74CB3Q3253PWRE4 support 5-V signals when VCC is powered down?
Yes, the SN74CB3Q3253PWRE4 maintains 5-V tolerance on all I/O pins-even when VCC = 0 V-due to integrated clamp diodes and Ioff circuitry. This allows safe interconnection between live 5-V buses and unpowered subsystems, a key requirement for hot-plug and partial-power-down architectures.
What is the purpose of the charge pump in the SN74CB3Q3253PWRE4?
The charge pump in the SN74CB3Q3253PWRE4 elevates the gate voltage of internal FET pass transistors to ensure low and flat ON-state resistance (ron ≈ 4 Ω) across the full 2.3–3.6 V VCC range. This eliminates ron variation with supply voltage, enabling consistent signal integrity and timing behavior in mixed-voltage designs.
Can the SN74CB3Q3253PWRE4 be used for analog signal switching?
Yes, the SN74CB3Q3253PWRE4 is explicitly qualified for both digital and analog applications-including low-distortion signal gating and differential bus isolation. Its rail-to-rail 0–5-V capability, low ron, and 3.5 pF B-port OFF-capacitance make it suitable for audio clocks, video sync signals, and other precision analog paths up to 100 MHz.
What is the thermal performance of the SN74CB3Q3253PWRE4 in TSSOP-16 package?
In its TSSOP-16 (PW) package, the SN74CB3Q3253PWRE4 has a junction-to-ambient thermal resistance (RθJA) of 112.7°C/W and junction-to-board (RθJB) of 57.85°C/W. With proper PCB copper pour under the thermal pad, it sustains continuous operation at 85°C ambient while delivering 64 mA per channel-validated per JEDEC JESD51 standards.
SN74CB3Q3253PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74CB3Q3253PWRE4 FAQ
1.How can I place an order for SN74CB3Q3253PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3253PWRE4 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 SN74CB3Q3253PWRE4 reliable?
The price and inventory of SN74CB3Q3253PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3253PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74CB3Q3253PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CB3Q3253PWRE4 transactions.
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4.How is shipping managed for SN74CB3Q3253PWRE4?
SN74CB3Q3253PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q3253PWRE4 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 SN74CB3Q3253PWRE4?
For technical support, including SN74CB3Q3253PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3253PWRE4 requirements.
6.How does Aetrix verify that SN74CB3Q3253PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3253PWRE4 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 SN74CB3Q3253PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3253PWRE4?
All SN74CB3Q3253PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3253PWRE4, 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 SN74CB3Q3253PWRE4 part is unused and in its original packaging.
Return procedure for SN74CB3Q3253PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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