My Inquiry
My Account
Texas Instruments SN74CBT3257PWRG4
- Part No.:
- SN74CBT3257PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3257PWRG4.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBT3257PWRG4 from Texas Instruments is a 4-bit 1-of-2 FET multiplexer/demultiplexer with 5-Ω on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and 0.25 ns typical propagation delay at 5 V. It operates from −40°C to 85°C and is used in high-speed data routing for bus switching, signal isolation, and level translation in digital logic systems.
For engineers reviewing the SN74CBT3257PWRG4 datasheet, SN74CBT3257PWRG4 pinout, SN74CBT3257PWRG4 application, or SN74CBT3257PWRG4 equivalent, key selection criteria include on-resistance matching across channels, OE/S-controlled bidirectional switching, low capacitive loading (Ci = 3.5 pF, Cio(OFF) = 4 pF), and TSSOP-16 package compatibility with dense PCB layouts.
Technical Context
The SN74CBT3257PWRG4 implements four independent bidirectional analog switches controlled by a shared select (S) and output-enable (OE) input. Each switch connects one A-terminal to either B1 or B2 based on S state when OE is low; all outputs disconnect when OE is high.
Its FET-based architecture delivers rail-to-rail analog signal handling, 128 mA continuous channel current capability, and minimal charge injection (<1 pC typical), enabling clean switching of digital and low-voltage analog signals without latch-up risk under recommended operating conditions (VCC = 4–5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, II = 30 mA - ensures minimal voltage drop and signal attenuation in high-current data paths. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V, CL = 50 pF - supports >1 GHz switching in high-speed bus applications. |
| Input capacitance (Ci) | 3.5 pF at VI = 3 V or 0 V - reduces loading on driving logic and preserves signal edge integrity. |
| Off-state capacitance (Cio) | 4 pF at VO = 3 V or 0 V, OE = VCC - minimizes crosstalk between inactive channels in multi-channel routing. |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage logic domains without level shifters. |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable recognition of standard TTL logic levels across temperature. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded and communications equipment. |
Pinout & Package
TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 15, 16 | Data I/O terminals (1A–4A, 1B1–4B1, 1B2–4B2) | Bidirectional analog/digital signal paths; each A port connects to corresponding B1 or B2 based on S and OE. |
| 7 | GND | Ground reference for all internal circuitry and signal return path. |
| 8 | VCC | Positive supply (4–5.5 V); powers internal FET switches and control logic. |
| 9 | OE | Active-low output enable; drives all switches into high-impedance state when high. |
| 10 | S | Select control; determines whether A ports connect to B1 (S = L) or B2 (S = H) when OE = L. |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance matching | Δron ≤ 2 Ω across all 4 channels - maintains consistent signal gain/attenuation in parallel data paths. |
| TTL-compatible control interface | VIH/VIL thresholds aligned to 5-V TTL - eliminates need for external level translators in legacy logic systems. |
| Bidirectional signal routing | No inherent directionality - supports data flow from A→B or B→A without signal degradation. |
| Break-before-make switching | Guaranteed isolation during transition per function table - prevents momentary shorting between B1/B2 buses. |
| Low dynamic power consumption | ICC = 3 μA typical at VCC = 5.5 V - enables use in low-power standby modes without leakage penalties. |
Applications
| PCI Bus Switching | Test Equipment Signal Routing |
|---|---|
Use Scenario: Isolating PCI address/data lines between two peripheral slots during hot-swap or configuration changes. IC Role / Device Role / Timing Role: Bidirectional 4-bit multiplexer enabling dynamic reconfiguration of shared bus segments without timing skew. Use Value: 5-Ω ron and 0.25 ns tpd preserve PCI-33 MHz timing margins while minimizing insertion loss. |
Use Scenario: Routing DUT signals between multiple measurement instruments (oscilloscope, logic analyzer, pattern generator) in automated test fixtures. IC Role / Device Role / Timing Role: Low-capacitance analog switch providing channel-selectable signal path with sub-nanosecond settling. Use Value: 4 pF Cio(OFF) limits inter-channel crosstalk; 3.5 pF Ci avoids bandwidth degradation on 100+ MHz probe paths. |
| Embedded Microcontroller I/O Expansion | Digital Audio Data Switching |
Use Scenario: Expanding GPIO count by time-multiplexing a single microcontroller port across multiple peripherals (ADC, DAC, sensor interface). IC Role / Device Role / Timing Role: TTL-controlled demultiplexer enabling software-configurable I/O mapping with deterministic latency. Use Value: OE/S dual-control allows atomic channel enable/disable; 2 V VIH ensures compatibility with 3.3 V MCU outputs via pull-up. |
Use Scenario: Selecting between two I²S audio sources (DAC output or SPDIF receiver) feeding a single codec or amplifier input. IC Role / Device Role / Timing Role: Bidirectional digital audio switch supporting sample-rate-agnostic data transfer with no DC bias requirement. Use Value: Rail-to-rail analog capability handles 0–3.3 V I²S logic swings; low charge injection prevents pop/click artifacts during switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384PWR | 8-bit, 2.5-V to 3.6-V operation, higher ron (7 Ω), integrated 5-V tolerant level shifters | Targeted at low-voltage mixed-signal systems; requires external 5-V supply for TTL compatibility | Choose when interfacing 3.3-V MCUs to 5-V legacy buses; not drop-in due to different pinout and voltage domain. |
| 74LVC1G3157DP,125 | Single-channel, 1.65–5.5-V operation, 10 Ω ron, smaller XSON-6 package | Optimized for space-constrained point-of-load switching rather than parallel 4-bit routing | Use for discrete signal gating where density matters more than channel count; requires four units to match SN74CBT3257PWRG4 functionality. |
Compared with SN74CBT3257PWRG4, SN74CBTD3384PWR offers wider voltage flexibility but lacks pin compatibility and requires redesign for 5-V TTL drive, while 74LVC1G3157DP,125 trades integration for footprint reduction-neither serves as a direct replacement without layout or firmware changes.
Availability
SN74CBT3257PWRG4 is available at Aetrix Electronics and suitable for industrial bus switching, automated test equipment signal routing, and embedded I/O expansion requiring stable component supply and long-term manufacturability.
Supply support for SN74CBT3257PWRG4 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74CBT3257PWRG4 belongs to TI's CBT (Crossbar Bus Transceiver) logic family, designed specifically for high-speed, low-distortion signal routing in 5-V digital systems where minimal propagation delay and precise on-resistance matching are critical.
FAQ
What is the maximum continuous current rating per channel of the SN74CBT3257PWRG4?
The SN74CBT3257PWRG4 supports up to 128 mA continuous channel current per switch under recommended operating conditions. This rating is validated across the full −40°C to +85°C temperature range and ensures reliable conduction without thermal runaway when VCC is maintained between 4 V and 5.5 V. Exceeding this current may increase on-resistance or trigger thermal shutdown in sustained operation.
Does the SN74CBT3257PWRG4 support bidirectional signal flow?
Yes, the SN74CBT3257PWRG4 supports fully bidirectional signal routing - data can pass equally well from A to B1/B2 or from B1/B2 to A. Its FET-based switch architecture has no intrinsic directionality, and the device maintains symmetrical on-resistance (5 Ω typical) and capacitance (≤4 pF off-state) regardless of signal direction, making it suitable for both multiplexing and demultiplexing configurations.
What is the function of the OE and S pins on the SN74CBT3257PWRG4?
The OE (output enable) pin is active-low and globally disables all four switches when high, placing their I/O terminals in high-impedance state. The S (select) pin determines routing destination: when OE is low, S = low connects each A port to its corresponding B1 terminal, and S = high connects each A port to its corresponding B2 terminal. Both controls operate asynchronously with no internal clock required.
Can the SN74CBT3257PWRG4 be used with 3.3-V logic control signals?
The SN74CBT3257PWRG4 requires VCC = 4–5.5 V and specifies VIH = 2 V minimum for reliable TTL-level recognition. A 3.3-V logic high meets this threshold and will correctly assert S and OE functions. However, the device itself must be powered from 5 V to guarantee 5-Ω on-resistance and 0.25 ns propagation delay; using 3.3 V on VCC degrades performance and is outside recommended conditions.
Is the SN74CBT3257PWRG4 pin-compatible with other packages in the same family?
No - the SN74CBT3257PWRG4 uses the TSSOP-16 (PW) package with specific pin assignments shown in the top-view diagram. While the logical function and signal names match across SOIC (D), SSOP (DB/DBQ), and QFN (RGY) variants, mechanical pinouts differ significantly: for example, VCC and GND positions vary between PW and DBQ packages, and QFN introduces an exposed thermal pad not present in TSSOP. PCB layout is not interchangeable.
SN74CBT3257PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74CBT3257PWRG4 FAQ
1.How can I place an order for SN74CBT3257PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3257PWRG4 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 SN74CBT3257PWRG4 reliable?
The price and inventory of SN74CBT3257PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3257PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3257PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3257PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3257PWRG4?
SN74CBT3257PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3257PWRG4 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 SN74CBT3257PWRG4?
For technical support, including SN74CBT3257PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3257PWRG4 requirements.
6.How does Aetrix verify that SN74CBT3257PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3257PWRG4 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 SN74CBT3257PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3257PWRG4?
All SN74CBT3257PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3257PWRG4, 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 SN74CBT3257PWRG4 part is unused and in its original packaging.
Return procedure for SN74CBT3257PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBT3257PWRG4 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…
