My Inquiry
My Account
Texas Instruments 74CB3Q3257DBQRE4
- Part No.:
- 74CB3Q3257DBQRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74CB3Q3257DBQRE4.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74CB3Q3257DBQRE4 from Texas Instruments is a 4-bit 1-of-2 FET multiplexer/demultiplexer bus switch optimized for high-bandwidth signal routing in low-voltage systems. It delivers rail-to-rail switching (0–5V with 3.3V VCC), 4Ω typical on-state resistance, 500MHz bandwidth, and bidirectional near-zero-propagation-delay operation - enabling clean signal gating in USB, optical networking, and differential interface applications.
For engineers reviewing the 74CB3Q3257DBQRE4 datasheet, 74CB3Q3257DBQRE4 pinout, 74CB3Q3257DBQRE4 application, or 74CB3Q3257DBQRE4 equivalent, this device serves as a low-distortion, 5V-tolerant analog/digital bus switch with Ioff partial-power-down support, 3.3V/2.5V supply compatibility, and SSOP-16 packaging for space-constrained board layouts.
Technical Context
The 74CB3Q3257DBQRE4 implements four independent 2:1 FET switches using an internal charge pump to elevate gate voltage, ensuring flat ron across its 2.3V–3.6V VCC range. Each channel features separate select (S) and output-enable (OE) control, supporting simultaneous 4-bit multiplexing or demultiplexing with bidirectional data flow.
Its 3.5pF typical off-state I/O capacitance and 5V-tolerant I/Os (operable powered up or down) enable minimal signal loading and robust hot-swap capability. The device complies with JESD78 Class II latch-up (>100mA) and JESD22 ESD standards (2000V HBM, 1000V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 2.3V to 3.6V - supports dual-rail logic interfacing (e.g., 1.8V/2.5V/3.3V domains) without level shifters |
| On-State Resistance (ron) | 4Ω typical at 3.3V - ensures <0.32ns propagation delay and minimal voltage drop under ±64mA load |
| Bandwidth | Up to 500MHz - enables high-fidelity routing of USB 2.0, PCIe Gen1, and video signals without distortion |
| I/O Capacitance (Cio(OFF)) | 3.5pF typical - reduces trace loading and preserves signal integrity in high-speed parallel buses |
| 5V Tolerance | VI/O = –0.5V to 7V - allows safe connection to 5V peripherals while operating from 2.5V/3.3V rails |
| Operating Temperature | –40°C to 105°C - qualified for industrial and telecom infrastructure environments |
| Ioff Support | Enables partial-power-down mode - prevents backflow current when VCC = 0, critical for system-level power sequencing |
Pinout & Package
74CB3Q3257DBQRE4 is packaged in a 16-pin SSOP (DBQ) measuring 4.9mm × 6.0mm with standard 0.65mm pitch. This surface-mount package supports automated assembly and provides thermal performance suitable for continuous operation at full bandwidth.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Select input | Controls path selection per channel: S = L connects A to B1; S = H connects A to B2 |
| OE | Output enable (active low) | Global enable/disable for all four channels; high-Z state when OE = high |
| 1A–4A | Common I/O ports | Bidirectional data terminals serving as multiplexer inputs or demultiplexer outputs |
| 1B1/1B2–4B1/4B2 | Channel I/O pairs | Two selectable paths per channel; each pair routes bidirectionally between A and selected B port |
| VCC | Power supply | 2.3V–3.6V supply for internal charge pump and logic; powers switch bias circuitry |
| GND | Ground reference | Return path for all I/O and internal circuits; must be low-impedance for signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports 0–5V signaling with 3.3V VCC and 0–3.3V with 2.5V VCC - eliminates external level translation in mixed-voltage systems |
| Charge-pump-enhanced FET switch | Delivers flat 4Ω ron across full VCC and temperature range - ensures consistent timing and insertion loss |
| 5V-tolerant I/Os | Operates safely with VI/O up to 7V regardless of VCC state - enables hot-plug and legacy peripheral interfacing |
| Low off-capacitance | 3.5pF typical Cio(OFF) - minimizes crosstalk and maintains impedance continuity in high-speed traces |
| Partial-power-down (Ioff) | Leakage <1µA when VCC = 0 - isolates powered-down sections to prevent backfeed and system-level faults |
Applications
| USB 2.0 Interface Switching | Optical Networking Signal Gating |
|---|---|
Use Scenario: Routing USB D+/D− signals between host controller and multiple downstream ports in IP phones or PBX systems. IC Role / Device Role / Timing Role: Bidirectional 2:1 analog switch providing low-distortion, sub-1ns propagation delay path selection without signal degradation. Use Value: Maintains USB 2.0 eye diagram integrity at 480Mbps with no added jitter or attenuation due to 4Ω ron and 3.5pF off-capacitance. |
Use Scenario: Isolating or selecting differential video-over-fiber or EPON data lanes during optical module reconfiguration. IC Role / Device Role / Timing Role: High-bandwidth analog bus switch enabling seamless lane switching with rail-to-rail 0–3.3V/0–5V compatibility. Use Value: Preserves signal fidelity up to 500MHz, supporting multi-gigabit optical transport without equalization overhead. |
| Differential Signal Multiplexing | Industrial Bus Isolation |
Use Scenario: Multiplexing LVDS or RSDS links in test equipment or programmable logic interconnects. IC Role / Device Role / Timing Role: Low-capacitance, bidirectional FET switch delivering matched path delay (<0.2ns skew) for differential pairs. Use Value: Enables precise timing alignment and common-mode noise rejection via symmetrical ron and Cio characteristics. |
Use Scenario: Isolating microcontroller GPIO banks from noisy industrial sensor buses during firmware updates or fault recovery. IC Role / Device Role / Timing Role: High-impedance switch activated by OE to decouple subsystems while maintaining 5V-tolerant I/O protection. Use Value: Prevents latch-up and ground bounce during hot-swap events, supported by >100mA JESD78 Class II rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3257DBQR | Higher ron (7Ω typ), no charge pump, 2.5V–5.5V VCC - lacks flat ron vs. temperature and 500MHz bandwidth | Lower-cost option for ≤200MHz applications where 5V tolerance and hot-swap are less critical | Choose when budget constraints outweigh need for ultra-low distortion and wide voltage margin |
| TS3A226AEYFFR | Single-supply 1.65V–3.6V, 0.7Ω ron, but only 2-channel, no 5V tolerance - requires external clamping for overvoltage | Better suited for portable battery-powered systems needing lowest ron, not industrial hot-swap | Prefer for compact, low-power designs where 5V I/O tolerance and 4-channel density are not required |
Compared with SN74CBT3257DBQR and TS3A226AEYFFR, the 74CB3Q3257DBQRE4 uniquely combines 500MHz bandwidth, 4Ω ron flatness, 5V I/O tolerance, and Ioff-enabled partial-power-down - making it the only choice for high-reliability, mixed-voltage telecom and optical infrastructure switching.
Availability
74CB3Q3257DBQRE4 is available at Aetrix Electronics and suitable for USB 2.0 interface routing, optical networking signal gating, and industrial bus isolation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 74CB3Q3257DBQRE4 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-performance signal-switching solutions.
The CB3Q family - including the 74CB3Q3257DBQRE4 - was designed specifically for high-bandwidth, low-distortion analog/digital bus switching in telecom, networking, and computing infrastructure where signal integrity and voltage flexibility are critical.
FAQ
What is the maximum operating frequency supported by the 74CB3Q3257DBQRE4?
The 74CB3Q3257DBQRE4 supports up to 500MHz bandwidth in high-fidelity signal routing applications. This specification is validated under typical conditions (VCC = 3.3V, TA = 25°C) with minimal trace parasitics. Real-world achievable frequency depends on PCB layout, load capacitance, and termination - but the device's 4Ω ron and 3.5pF Cio(OFF) enable reliable operation well above 200MHz in properly designed systems. The 74CB3Q3257DBQRE4 maintains signal integrity without equalization or pre-emphasis.
Does the 74CB3Q3257DBQRE4 support 5V-tolerant I/Os when unpowered?
Yes, the 74CB3Q3257DBQRE4 supports 5V-tolerant I/Os both when powered up and powered down, with VI/O rated from –0.5V to 7V regardless of VCC state. This enables safe hot-plug operation and interoperability with legacy 5V peripherals even when the local 3.3V/2.5V supply is off. The Ioff feature further ensures no damaging back-current flows into the device during partial-power-down sequences - a key reliability advantage of the 74CB3Q3257DBQRE4.
What is the on-state resistance (ron) of the 74CB3Q3257DBQRE4 and how does it vary?
The 74CB3Q3257DBQRE4 has a typical on-state resistance of 4Ω at VCC = 3.3V, with flat performance across its full operating range (2.3V–3.6V) and temperature (–40°C to 105°C). Measured at IO = ±30mA, ron stays within 4–8Ω across conditions - enabled by its internal charge pump that elevates the FET gate voltage. This flatness ensures consistent voltage drop, timing, and insertion loss in the 74CB3Q3257DBQRE4, unlike non-charge-pump alternatives whose ron rises sharply at low VCC.
How does the 74CB3Q3257DBQRE4 handle partial-power-down scenarios?
The 74CB3Q3257DBQRE4 incorporates Ioff circuitry that actively disables all switch paths when VCC = 0V, limiting I/O leakage to <1µA and preventing back-current flow. This allows safe integration into systems with staggered power sequencing - for example, isolating a powered-down FPGA bank from an active sensor bus. Unlike basic bus switches, the 74CB3Q3257DBQRE4 maintains high-impedance isolation without external pull-ups or auxiliary control, simplifying design and improving fault resilience.
What package type is used for the 74CB3Q3257DBQRE4 and what are its key mechanical properties?
The 74CB3Q3257DBQRE4 uses a 16-pin SSOP (Shrink Small Outline Package) with designation DBQ, measuring 4.9mm × 6.0mm and 0.65mm lead pitch. It features gull-wing leads compatible with standard reflow profiles (MSL Level-2-260°C-1 year), NiPdAu lead finish, and RoHS compliance. Its thermal resistance (RθJA = 114.3°C/W) supports continuous operation at full bandwidth in industrial ambient temperatures - a verified mechanical and thermal profile unique to the 74CB3Q3257DBQRE4 DBQ variant.
74CB3Q3257DBQRE4 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:
- 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-SSOP
74CB3Q3257DBQRE4 FAQ
1.How can I place an order for 74CB3Q3257DBQRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CB3Q3257DBQRE4 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 74CB3Q3257DBQRE4 reliable?
The price and inventory of 74CB3Q3257DBQRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CB3Q3257DBQRE4 is usually 5 days.
3.What payment methods are accepted for 74CB3Q3257DBQRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CB3Q3257DBQRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CB3Q3257DBQRE4?
74CB3Q3257DBQRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CB3Q3257DBQRE4 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 74CB3Q3257DBQRE4?
For technical support, including 74CB3Q3257DBQRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CB3Q3257DBQRE4 requirements.
6.How does Aetrix verify that 74CB3Q3257DBQRE4 is sourced from the original manufacturer or authorized distributors?
All 74CB3Q3257DBQRE4 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 74CB3Q3257DBQRE4 meets industry standards.
7.What is the process for return or replacement of 74CB3Q3257DBQRE4?
All 74CB3Q3257DBQRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CB3Q3257DBQRE4, 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 74CB3Q3257DBQRE4 part is unused and in its original packaging.
Return procedure for 74CB3Q3257DBQRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74CB3Q3257DBQRE4 Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
