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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Nexperia USA Inc. CBT3257ADS,118

Name: CBT3257ADS,118
Brand: Nexperia USA Inc.
SKU: CBT3257ADS,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CBT3257ADS,118

Manufacturer:: Nexperia USA Inc.

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SSOP (0.154", 3.90mm Width)

Datasheet:: CBT3257ADS,118.pdf

Description:: IC MUX/DEMUX 4 X 2:1 16SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CBT3257ADS,118 from Nexperia is a quad 1-of-2 bus switch IC configured as four independent single-pole double-throw (SPDT) analog switches, operating at 4.5–5.5 V supply, with 5 Ω typical ON resistance, <0.25 ns propagation delay, and active-Low OE control - used for high-speed signal routing in PCIe Gen1/2 interconnects, memory address multiplexing, and FPGA I/O expansion.

For engineers reviewing the CBT3257ADS,118 datasheet, CBT3257ADS,118 pinout, CBT3257ADS,118 application, or CBT3257ADS,118 equivalent, key selection criteria include guaranteed 5 Ω R_ON matching across channels, -40 °C to +85 °C industrial temperature range, SSOP16 package compatibility with 0.635 mm pitch, and overvoltage-tolerant control inputs up to 5.5 V.

Technical Context

The CBT3257ADS,118 implements TTL-compatible digital control of bidirectional analog signal paths using NMOS-only transmission gate architecture. Each of the four switch channels features independent select (S) and global output enable (OE) logic, supporting both multiplexer (A→B1/B2) and demultiplexer (B1/B2→A) operation modes.

Switching behavior follows strict truth table: OE=L enables channel; S=L connects nA to nB1; S=H connects nA to nB2; OE=H forces all outputs into high-impedance state. No internal level-shifting or bias circuitry is present - all ports are fully bidirectional and voltage-rail constrained to V_CC.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - ensures compatibility with 5 V TTL and LVTTL logic families without external level shifters
R_ON (Typ)	5 Ω - enables <10 mV voltage drop at 100 mA load, critical for low-distortion analog/data bus switching
t_pd Max	5.0 ns - supports >100 MHz signal routing in high-speed digital interfaces like PCI and parallel flash
I_OFF Leakage	±1 μA - maintains signal integrity during channel disable, preventing crosstalk in multi-channel systems
Input Voltage Tolerance	Up to 5.5 V - allows direct connection to 5 V control signals even when V_CC = 4.5 V, eliminating pull-up resistors
Operating Temp	-40 °C to +85 °C - qualified for industrial-grade embedded controllers, networking equipment, and test instrumentation
ESD Rating	HBM >2000 V, CDM >1000 V - withstands handling and board-level ESD events without latch-up or parametric shift

Pinout & Package

CBT3257ADS,118 is packaged in SSOP16 (SOT519-1): plastic shrink small outline, 16-pin, 3.9 mm body width, 0.635 mm lead pitch, 1.2 mm max height.

Pin/Terminal	Circuit Role	Design Meaning
1	S (Select)	Global channel select input - LOW routes nA to nB1; HIGH routes nA to nB2 for all four channels
2–3, 5–6, 10–11, 13–14	nB1 / nB2	B-side bidirectional terminals - each pair (e.g., Pin 2 & 3) serves one channel's B1/B2 outputs/inputs
4, 7, 9, 12	nA	A-side bidirectional terminals - dedicated A port per channel (1A–4A), directly connected to B ports when enabled
8	GND	Analog/digital ground reference - must be low-impedance plane to minimize R_ON variation and noise coupling
15	OE	Active-Low output enable - drives all four channels into high-Z when HIGH; required for hot-swap or power-gating
16	V_CC	Positive supply - powers internal logic and switch transistors; decoupling capacitor (100 nF) mandatory at pin

Key Features

Feature	Design Value
5 Ω ON resistance	Ensures minimal insertion loss and impedance discontinuity in 50 Ω data paths, preserving signal rise/fall times
Sub-5 ns propagation delay	Enables cycle-accurate routing in synchronous bus architectures with ≤10 ns clock periods
Overvoltage-tolerant control inputs	Accepts 5.5 V logic signals regardless of V_CC (4.5–5.5 V), simplifying mixed-voltage system integration
Latch-up immunity >100 mA	Guarantees robustness against transient current surges on I/O lines per JEDEC JESD78 Class II Level A
Quad independent SPDT topology	Supports simultaneous 4× 1:2 or 2× 2:1 configurations without inter-channel timing skew or loading interaction

Applications

PCIe Gen1 Interconnect Switching

FPGA I/O Expansion Hub

Use Scenario: Routing differential PCIe REFCLK and sideband signals (PERST#, WAKE#) between multiple slots and root complex under thermal/power constraints.

IC Role / Device Role / Timing Role: Bidirectional analog switch providing sub-5 ns path enable/disable for clock and control lines without jitter accumulation.

Use Value: Eliminates need for discrete MOSFET arrays while maintaining <1 ps added jitter and <5 Ω channel matching across all four lanes.

Use Scenario: Expanding limited FPGA I/O banks to drive multiple peripheral interfaces (SPI, UART, GPIO) via time-shared pins.

IC Role / Device Role / Timing Role: Quad SPDT bus switch enabling dynamic reconfiguration of FPGA pin functions without FPGA reconfiguration overhead.

Use Value: Reduces FPGA pin count requirement by 4×, supports real-time peripheral swapping with <5 ns channel switching latency.

Memory Address Multiplexing

Industrial Sensor Signal Conditioning

Use Scenario: Sharing a single 16-bit address/data bus among multiple SRAM, Flash, and FPGA configuration memory devices.

IC Role / Device Role / Timing Role: Low-R_ON analog switch acting as address decoder-controlled bus segment selector.

Use Value: Maintains signal integrity at 100 MHz bus speeds with <10 mV drop at 100 mA, avoiding timing margin erosion.

Use Scenario: Selecting between four analog sensor outputs (RTD, thermocouple, pressure, humidity) for shared ADC input in PLC modules.

IC Role / Device Role / Timing Role: Precision analog multiplexer with matched R_ON and low leakage for ratiometric measurement accuracy.

Use Value: Enables <0.1% gain error across channels due to 5 Ω R_ON matching and ±1 μA leakage, meeting IEC 61000-4-5 surge immunity requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad SPDT bus switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74CBT3257PWR	Same 5 Ω R_ON, but 3.3 V only (V_CC = 2.3–3.6 V); no 5.5 V tolerant inputs	Restricted to 3.3 V systems; unsuitable for mixed 5 V/3.3 V backplanes	Select only if entire system operates at 3.3 V and requires TI's enhanced ESD spec (HBM >8 kV)
74LVC1G3157GW	Single-channel device; R_ON = 10 Ω; t_pd = 4.5 ns; V_CC = 1.65–5.5 V	Requires four separate packages for quad function; higher R_ON increases voltage drop at >50 mA	Use when board space allows discrete placement and lower cost per channel outweighs layout complexity

Compared with SN74CBT3257PWR and 74LVC1G3157GW, CBT3257ADS,118 uniquely delivers 5 V tolerance, quad integration in SSOP16, and 5 Ω R_ON - making it optimal for industrial 5 V bus switching where voltage margin, channel density, and analog fidelity are jointly critical.

Availability

CBT3257ADS,118 is available at Aetrix Electronics and suitable for PCIe interconnect routing, FPGA I/O expansion, memory address multiplexing, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CBT3257ADS,118 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

Nexperia is a global semiconductor expert delivering high-performance, reliable, and energy-efficient components for automotive, industrial, computing, consumer, and communications markets.

CBT3257ADS,118 belongs to Nexperia's CBT (CMOS Bi-directional Transistor) bus switch family, engineered for ultra-low R_ON and nanosecond-speed signal routing in 5 V digital systems with stringent analog integrity requirements.

FAQ

What is the maximum continuous current per switch channel?

The CBT3257ADS,118 supports up to 128 mA continuous current per switch channel, as specified in the Absolute Maximum Ratings table. This rating assumes proper PCB thermal design with adequate copper pour and ambient temperature ≤+85 °C. Exceeding this current may cause R_ON drift or thermal shutdown in sustained operation.

Can the control inputs (S and OE) be driven by 3.3 V logic while V_CC = 5 V?

Yes - the control inputs are overvoltage tolerant up to 5.5 V and compatible with 3.3 V TTL levels. VIH is defined as ≥2.0 V and VIL ≤0.8 V, so standard 3.3 V CMOS outputs meet these thresholds with margin. No level shifter is needed, simplifying mixed-voltage interface design.

Is the SSOP16 package (SOT519-1) pin-compatible with SO16 (SOT109-1)?

Yes - both SOT519-1 (SSOP16) and SOT109-1 (SO16) share identical pin numbering, function mapping, and 16-pin layout per Figures 2 and 3. Mechanical differences (body width, lead pitch) require separate footprints, but schematic symbols and net assignments remain identical across variants.

Does the device support hot-swap or live-insertion applications?

Yes - the CBT3257ADS,118 supports hot-swap via its active-Low OE pin: asserting OE=HIGH places all channels in high-impedance state before power-up or during removal, preventing bus contention. Combined with latch-up immunity >100 mA and ESD protection >2000 V HBM, it meets IEC 61000-4-2 Level 4 requirements for field-replaceable modules.

CBT3257ADS,118 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74CBT

Package/Case:: 16-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

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-SSOP

CBT3257ADS,118 FAQ

1.How can I place an order for CBT3257ADS,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for CBT3257ADS,118 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 CBT3257ADS,118 reliable?

The price and inventory of CBT3257ADS,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3257ADS,118 is usually 5 days.

3.What payment methods are accepted for CBT3257ADS,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3257ADS,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CBT3257ADS,118?

CBT3257ADS,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CBT3257ADS,118 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 CBT3257ADS,118?

For technical support, including CBT3257ADS,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3257ADS,118 requirements.

6.How does Aetrix verify that CBT3257ADS,118 is sourced from the original manufacturer or authorized distributors?

All CBT3257ADS,118 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 CBT3257ADS,118 meets industry standards.

7.What is the process for return or replacement of CBT3257ADS,118?

All CBT3257ADS,118 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3257ADS,118, 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 CBT3257ADS,118 part is unused and in its original packaging.

Return procedure for CBT3257ADS,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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