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Texas Instruments SN74CBT3257CPWRE4
- Part No.:
- SN74CBT3257CPWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3257CPWRE4.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,772
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Product details
Overview
SN74CBT3257CPWRE4 from Texas Instruments is a 4-bit 1-of-2 FET bus switch with bidirectional data flow, 3 Ω typical ON-state resistance, −2 V undershoot protection on A/B ports, and 0.15 ns propagation delay at 5 V. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in USB interface and bus isolation applications.
For engineers reviewing the SN74CBT3257CPWRE4 datasheet, SN74CBT3257CPWRE4 pinout, SN74CBT3257CPWRE4 application, or SN74CBT3257CPWRE4 equivalent, key selection criteria include Ioff partial-power-down capability, low 5.5 pF OFF-state B-port capacitance, TTL/CMOS-compatible control inputs, and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBT3257CPWRE4 implements four independent FET-based analog/digital switches controlled by a shared select (S) input and global output-enable (OE) signal. Each switch connects one A port to either of two B ports (B1 or B2), enabling 1-of-2 multiplexing or demultiplexing with near-zero propagation delay due to its low-ron FET architecture.
Its undershoot-protection circuitry actively clamps A/B port voltages down to −2 V while maintaining OFF-state isolation, and the Ioff feature guarantees current blocking when VCC = 0 V-critical for hot-swap and partial-power-down systems where backdrive must be prevented across unpowered rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - minimizes voltage drop and power loss in signal paths carrying up to ±128 mA. |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - enables high-speed switching without timing skew in parallel bus applications. |
| B-port OFF capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading and preserves signal integrity in high-frequency gating. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply droop. |
| Undershoot protection limit | −2 V on A/B ports - prevents false turn-on and latch-up during transient negative excursions. |
| Ioff leakage current | 10 µA max at VCC = 0 V - ensures robust isolation between powered and unpowered system domains. |
| Control input compatibility | TTL and 3.3/5-V CMOS - eliminates level-shifting requirements for common microcontroller GPIOs. |
Pinout & Package
TSSOP-16 package (PW), 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm pitch, exposed pad not present. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15 | A/B data terminals (1A, 1B1, 1B2, ..., 4A, 4B1, 4B2) | Bidirectional analog/digital signal paths; each pair forms one independent 1-of-2 switch. |
| 4, 12 | S (Select), OE (Output Enable) | S selects B1/B2 path per channel; OE globally enables/disables all switches (active-low). |
| 8 | GND | Reference ground for all I/O and internal circuitry; must be low-impedance for noise immunity. |
| 16 | VCC | Positive supply (4–5.5 V); powers internal clamp diodes and switch control logic. |
Key Features
| Feature | Design Value |
|---|---|
| Undershoot protection | Active clamping to −2 V on all A/B ports prevents unintended conduction during negative transients. |
| Partial-power-down support | Ioff limits back-current to ≤10 µA when VCC = 0 V, enabling safe insertion into live backplanes. |
| Mixed-voltage interoperability | 0–5.5 V data I/O tolerance allows interfacing between 1.8-V, 2.5-V, 3.3-V, and 5-V subsystems without level shifters. |
| Low capacitive loading | 5.5 pF typical Cio(OFF) minimizes signal distortion and crosstalk in high-speed parallel buses. |
| High ESD robustness | 2000-V HBM and 1000-V CDM rating reduce field failure risk in handling and assembly environments. |
Applications
| USB Interface Signal Gating | PCI/PCIe Bus Isolation |
|---|---|
|
Use Scenario: Isolating USB 2.0 D+/D− lines during device enumeration or port sharing. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling differential signal paths with sub-nanosecond delay. Use Value: Preserves USB signal integrity via 3 Ω ron and 5.5 pF Cio(OFF), avoiding eye-diagram degradation. |
Use Scenario: Segmenting legacy PCI bus segments to prevent ground loops or fault propagation. IC Role / Device Role / Timing Role: High-speed digital bus switch providing galvanic isolation between powered/unpowered slots. Use Value: Ioff blocks backfeed during hot-plug events; −2 V undershoot protection handles bus contention transients. |
| Low-Distortion Audio Routing | FPGA I/O Expansion |
|
Use Scenario: Routing line-level analog audio signals between codecs and amplifiers in portable devices. IC Role / Device Role / Timing Role: Low-ron, low-capacitance analog switch minimizing THD+N and bandwidth loss. Use Value: 3 Ω ron and 5.5 pF Cio(OFF) maintain flat frequency response up to 100 MHz with <0.01% distortion. |
Use Scenario: Expanding FPGA GPIO count by multiplexing multiple peripheral buses onto shared pins. IC Role / Device Role / Timing Role: 4-channel 1-of-2 selector enabling dynamic reconfiguration of SPI/I²C/UART interfaces. Use Value: 0.15 ns tpd ensures setup/hold timing margins are preserved across FPGA clock domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3384CPWRE4 | 8-bit, dual-supply (1.65–5.5 V), higher ron (5 Ω typ), no undershoot protection | Supports wider voltage translation but lacks −2 V clamping for harsh transient environments | Choose for multi-rail translation where undershoot is not expected; avoid for industrial USB or hot-swap use. |
| TS3A227EYZTR | 4-channel SPDT, 1.65–3.6 V only, 0.9 Ω ron, integrated ESD (±8 kV HBM), no Ioff | Optimized for portable battery-powered systems; incompatible with 5-V buses or partial-power-down | Prefer for 3.3-V mobile designs requiring ultra-low ron and enhanced ESD; not suitable for 5-V or backplane isolation. |
Compared with SN74CBT3257CPWRE4, SN74CBTD3384CPWRE4 offers broader voltage translation but sacrifices undershoot resilience, while TS3A227EYZTR delivers lower resistance and better ESD protection within a narrower 1.65–3.6 V window-neither provides identical 5-V robustness and Ioff safety.
Availability
SN74CBT3257CPWRE4 is available at Aetrix Electronics and suitable for USB interface design, bus isolation systems, and low-distortion analog signal routing requiring stable component supply across industrial temperature ranges (−40°C to 85°C).
Supply support for SN74CBT3257CPWRE4 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 solutions, with decades of expertise in high-speed logic and interface ICs.
The SN74CBT3257C family was designed for high-fidelity signal routing in mixed-voltage digital systems-emphasizing low distortion, fast switching, and robust fault tolerance in computing, communications, and industrial control equipment.
FAQ
What is the maximum signal voltage the SN74CBT3257CPWRE4 can handle on its A/B ports?
The SN74CBT3257CPWRE4 supports data I/O voltages from 0 V to 5.5 V on A and B ports, with absolute maximum ratings extending to −0.5 V to 7 V. Its undershoot protection actively clamps negative excursions to −2 V, ensuring reliable OFF-state isolation even under transient conditions. This makes SN74CBT3257CPWRE4 suitable for mixed-voltage systems including 1.8-V, 2.5-V, 3.3-V, and 5-V signaling domains.
Does the SN74CBT3257CPWRE4 support hot-swap or partial-power-down operation?
Yes, the SN74CBT3257CPWRE4 includes Ioff circuitry that limits current to ≤10 µA when VCC = 0 V, preventing damaging back-current flow between powered and unpowered sections of a system. This feature enables safe hot-plug operation in backplane or modular systems. To ensure high-impedance state during power transitions, OE should be tied to VCC via a pullup resistor, as specified in the SN74CBT3257CPWRE4 datasheet.
What is the typical ON-state resistance of the SN74CBT3257CPWRE4 and how does it affect signal integrity?
The SN74CBT3257CPWRE4 has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and power dissipation across the switch, preserving signal amplitude and reducing timing skew-especially critical in parallel bus and high-speed digital applications. Measured ron remains ≤6 Ω across full operating conditions, ensuring consistent performance in SN74CBT3257CPWRE4 deployments.
Can the SN74CBT3257CPWRE4 be used for analog signal switching, such as audio or sensor signals?
Yes, the SN74CBT3257CPWRE4 is explicitly qualified for both digital and analog applications, including low-distortion signal gating. With 3 Ω ron, 5.5 pF Cio(OFF), and flat frequency response up to 100 MHz, it maintains signal fidelity for line-level audio, thermistor readings, and other low-bandwidth analog signals. Its bidirectional nature and rail-to-rail voltage handling make SN74CBT3257CPWRE4 well-suited for reconfigurable analog front-ends.
What package type and footprint does the SN74CBT3257CPWRE4 use?
The SN74CBT3257CPWRE4 uses the TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, and no exposed thermal pad. It complies with JEDEC MO-153, features NIPDAU lead finish, and carries MSL Level-1 rating (unlimited floor life). The pin 1 index area and land pattern match TI's DB0016A outline, ensuring compatibility with standard SMT assembly processes.
SN74CBT3257CPWRE4 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
SN74CBT3257CPWRE4 FAQ
1.How can I place an order for SN74CBT3257CPWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3257CPWRE4 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 SN74CBT3257CPWRE4 reliable?
The price and inventory of SN74CBT3257CPWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3257CPWRE4 is usually 5 days.
3.What payment methods are accepted for SN74CBT3257CPWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT3257CPWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT3257CPWRE4?
SN74CBT3257CPWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3257CPWRE4 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 SN74CBT3257CPWRE4?
For technical support, including SN74CBT3257CPWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3257CPWRE4 requirements.
6.How does Aetrix verify that SN74CBT3257CPWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74CBT3257CPWRE4 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 SN74CBT3257CPWRE4 meets industry standards.
7.What is the process for return or replacement of SN74CBT3257CPWRE4?
All SN74CBT3257CPWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3257CPWRE4, 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 SN74CBT3257CPWRE4 part is unused and in its original packaging.
Return procedure for SN74CBT3257CPWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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