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Texas Instruments SN74CB3Q3257PWRG4
- Part No.:
- SN74CB3Q3257PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3Q3257PWRG4.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,291
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Product details
Overview
SN74CB3Q3257PWRG4 from Texas Instruments is a 4-bit 1-of-2 FET multiplexer/demultiplexer optimized for high-bandwidth bus switching, featuring 4Ω typical on-state resistance (ron), 500MHz signal bandwidth, 5V-tolerant I/Os with device powered up or down, rail-to-rail 0–5V switching at 3.3V VCC, and bidirectional near-zero-propagation-delay data flow - deployed in optical networking, IP phones, and USB interface isolation.
For engineers reviewing the SN74CB3Q3257PWRG4 datasheet, SN74CB3Q3257PWRG4 pinout, SN74CB3Q3257PWRG4 application, or SN74CB3Q3257PWRG4 equivalent, key selection criteria include VCC operating range (2.3–3.6V), Ioff partial-power-down support, low 3.5pF off-state I/O capacitance, 20MHz max OE switching frequency, and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The SN74CB3Q3257PWRG4 integrates four independent 1-of-2 analog/digital switches, each controlled by a shared select (S) input and individual output-enable (OE) inputs, enabling simultaneous 4-channel 2:1 multiplexing or demultiplexing. Its charge-pump-enhanced gate drive ensures flat ron across voltage and temperature, supporting rail-to-rail signal integrity without level-shifting circuitry.
Each switch exhibits bidirectional operation with sub-0.32ns propagation delay (tpd) at 3.3V VCC, 3.5pF typical off-state I/O capacitance to minimize signal distortion, and undershoot clamp diodes on all control and data terminals - making it suitable for hot-swap-capable, mixed-voltage system interconnects requiring robust ESD immunity (2000V HBM) and latch-up resilience (>100mA per JESD78 Class II).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 2.3V to 3.6V - enables interoperability with 2.5V and 3.3V logic domains while maintaining 5V-tolerant I/Os |
| On-State Resistance (ron) | 4Ω typical - ensures minimal insertion loss and signal attenuation in high-speed data paths |
| Bandwidth | Up to 500MHz - supports broadband applications including USB 2.0, video-over-fiber, and EPON interfaces |
| I/O Capacitance (Cio(OFF)) | 3.5pF typical - reduces capacitive loading and preserves edge fidelity in >100MHz digital buses |
| Switching Frequency (fOE) | 20MHz maximum - defines maximum toggle rate for OE-controlled channel enable/disable cycles |
| Propagation Delay (tpd) | 0.2ns typical at 3.3V - enables sub-nanosecond timing alignment critical for synchronous bus architectures |
| ESD Rating (HBM) | ±2000V - meets industrial-grade electrostatic discharge immunity requirements without external protection |
Pinout & Package
TSSOP-16 (PW) package: 5mm × 6.4mm body, 0.65mm pitch, exposed thermal pad (RGY variant differs; this part uses PW). RoHS-compliant, NIPDAU lead finish, MSL Level-1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Select input | Common 2:1 path selector for all four channels; determines whether A connects to B1 or B2 |
| OE | Output-enable (active-low) | Global enable/disable control; high = high-impedance isolation, low = bidirectional conduction |
| 1A–4A | Channel common I/O ports | Bidirectional data terminals tied to system bus; tolerate 0–5V signals regardless of VCC |
| 1B1/1B2–4B1/4B2 | Channel branch I/O ports | Two per channel; selected via S to connect to corresponding A port during OE = low |
| VCC | Power supply | Supplies internal charge pump and logic; powers switch core and clamp diodes |
| GND | Ground reference | Return path for all I/O and internal circuitry; required for proper charge-pump operation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0–5V switching at 3.3V VCC | Eliminates need for external level shifters when interfacing 5V peripherals with 3.3V controllers |
| Ioff partial-power-down support | Prevents back-current flow when VCC = 0, enabling safe hot-plug operation in modular systems |
| 5V-tolerant I/Os with device powered up or down | Allows seamless integration into mixed-voltage backplanes where power sequencing is uncontrolled |
| Low 3.5pF off-state I/O capacitance | Minimizes crosstalk and signal reflection in high-frequency parallel buses (e.g., memory expansion, PCIe sideband) |
| Charge-pump-enhanced gate drive | Maintains flat 4Ω ron across full VCC (2.3–3.6V) and temperature (–40°C to 105°C) range |
Applications
| Optical Networking | IP Telephony |
|---|---|
Use Scenario: Signal routing between SFP+ transceivers and host MAC controllers in EPON OLT line cards. IC Role / Device Role / Timing Role: Bidirectional 4-bit 2:1 multiplexer isolating differential clock/data lanes during module hot-swap. Use Value: Enables zero-latency failover between redundant fiber links using same physical connector footprint. |
Use Scenario: Dynamic audio path selection between handset, headset, and speakerphone in VoIP desk phones. IC Role / Device Role / Timing Role: Low-distortion analog/digital bus switch routing PCM audio streams between codec and interface ICs. Use Value: Maintains <0.32ns tpd and <4Ω ron to preserve wideband voice fidelity (up to 8kHz) without added jitter. |
| USB Interface Isolation | Private Branch Exchange (PBX) |
Use Scenario: Isolating USB 2.0 D+/D− lines between host SoC and peripheral hub in embedded medical devices. IC Role / Device Role / Timing Role: High-bandwidth bidirectional switch enabling USB enumeration while blocking ground loops. Use Value: 500MHz bandwidth and 3.5pF Cio(OFF) ensure full-speed (480Mbps) compliance without signal integrity degradation. |
Use Scenario: Multiplexing TDM voice channels between DSP and line interface units in carrier-grade PBX systems. IC Role / Device Role / Timing Role: Four independent 2:1 analog switches handling G.703/G.711 PCM time slots with rail-to-rail swing. Use Value: 0–5V signaling support allows direct connection to legacy E1/T1 line drivers without level translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3244PWR | Higher ron (7Ω typ), no charge pump, 3.3V-only VCC (3.0–3.6V), lower bandwidth (200MHz) | Limited to single-supply 3.3V systems; unsuitable for 2.5V operation or 5V-tolerant mixed-voltage routing | Choose when cost sensitivity outweighs bandwidth and voltage-flexibility requirements |
| TS3A226AEYFFR | Lower ron (0.7Ω typ), 1.65–3.6V VCC, but only 2-channel, no S-select architecture, higher Cio(OFF) (11pF) | Not pin-compatible; lacks 4-channel 2:1 topology and global S control - requires redesign for multiplexer function | Prefer for ultra-low-loss point-to-point analog switching where channel count and topology permit |
Compared with SN74CBT3244PWR and TS3A226AEYFFR, the SN74CB3Q3257PWRG4 uniquely delivers 4-channel 2:1 multiplexing with charge-pump-stabilized ron, 5V I/O tolerance across 2.5V/3.3V supplies, and 500MHz bandwidth - making it the only option meeting simultaneous requirements for optical networking backplane routing and hot-pluggable USB isolation.
Availability
SN74CB3Q3257PWRG4 is available at Aetrix Electronics and suitable for optical networking equipment, IP telephony hardware, and USB interface isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.
Supply support for SN74CB3Q3257PWRG4 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 precision analog design and high-reliability manufacturing.
The SN74CB3Q3257PWRG4 belongs to TI's CB3Q family of high-bandwidth FET bus switches, engineered specifically for low-distortion, rail-to-rail signal routing in broadband communications infrastructure and mixed-voltage system interconnects.
FAQ
What is the maximum operating temperature for the SN74CB3Q3257PWRG4?
The SN74CB3Q3257PWRG4 is rated for operation from –40°C to +105°C ambient temperature, validated per JEDEC JESD22-A104 thermal cycling and JESD22-A108 high-temperature operating life testing. This extended range supports deployment in industrial optical modules and outdoor telecom equipment where thermal margins exceed standard commercial limits.
Does the SN74CB3Q3257PWRG4 support partial-power-down mode?
Yes, the SN74CB3Q3257PWRG4 implements Ioff circuitry that actively disables current paths when VCC = 0V, preventing damaging back-current flow from live I/Os into a powered-down system domain. This feature is verified per JESD78 Class II latch-up testing and enables safe hot-swap capability in modular chassis designs.
Can the SN74CB3Q3257PWRG4 be used with 2.5V VCC for 0–3.3V signal switching?
Yes, the SN74CB3Q3257PWRG4 supports rail-to-rail 0–3.3V switching when powered from 2.5V VCC, as confirmed in Section 1 Features and Table 5.3 Recommended Operating Conditions. This allows direct interface between 2.5V FPGAs and 3.3V peripherals without external level shifters or voltage translators.
What is the purpose of the charge pump in the SN74CB3Q3257PWRG4?
The integrated charge pump elevates the gate voltage of the internal pass FETs above VCC, ensuring low and flat on-state resistance (ron ≈ 4Ω) across the full 2.3–3.6V VCC range and –40°C to 105°C temperature span. This eliminates ron drift-induced signal distortion in high-speed data paths, unlike passive-switch alternatives.
Is the SN74CB3Q3257PWRG4 pin-compatible with other packages in the same family?
No - the SN74CB3Q3257PWRG4 uses the TSSOP-16 (PW) package with 5mm × 6.4mm dimensions and 0.65mm pitch. While functional equivalents exist in SSOP (DBQ), TVSOP (DGV), and VQFN (RGY) variants, pinouts differ across packages due to thermal pad placement and pin numbering variations; PCB layout must match the PW-specific footprint.
SN74CB3Q3257PWRG4 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:
- 4 x 2:1
- 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
SN74CB3Q3257PWRG4 FAQ
1.How can I place an order for SN74CB3Q3257PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q3257PWRG4 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 SN74CB3Q3257PWRG4 reliable?
The price and inventory of SN74CB3Q3257PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q3257PWRG4 is usually 5 days.
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SN74CB3Q3257PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3Q3257PWRG4 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 SN74CB3Q3257PWRG4?
For technical support, including SN74CB3Q3257PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q3257PWRG4 requirements.
6.How does Aetrix verify that SN74CB3Q3257PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q3257PWRG4 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 SN74CB3Q3257PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CB3Q3257PWRG4?
All SN74CB3Q3257PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q3257PWRG4, 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 SN74CB3Q3257PWRG4 part is unused and in its original packaging.
Return procedure for SN74CB3Q3257PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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