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

Nexperia USA Inc. CBT3125DB,112

Name: CBT3125DB,112
Brand: Nexperia USA Inc.
SKU: CBT3125DB,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CBT3125DB,112

Manufacturer:: Nexperia USA Inc.

Category:: Signal Switches, Multiplexers, Decoders

Package:: 14-SSOP (0.209", 5.30mm Width)

Datasheet:: CBT3125DB,112.pdf

Description:: IC BUS SWITCH 1 X 1:1 14SSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,675

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Product details

Overview

CBT3125DB,112 from Nexperia is a quadruple FET bus switch IC with independent 5 Ω analog switches, TTL-compatible control inputs (1OE–4OE), VCC = 4.5–5.5 V operation, and SO14/SSOP14/TSSOP14 package options - used for bidirectional signal routing in high-speed digital buses such as PCI, ISA, and memory address/data lines.

For engineers reviewing the CBT3125DB,112 datasheet, CBT3125DB,112 pinout, CBT3125DB,112 application, or CBT3125DB,112 equivalent, key selection criteria include ON-resistance (5–7 Ω), enable/disable timing (1.0–5.4 ns), ESD robustness (HBM >2000 V), and SSOP14 footprint compatibility with legacy '125'-type layouts.

Technical Context

This device implements four independent single-pole single-throw (SPST) NMOS FET switches, each controlled by an active-low output enable (nOE) input. Switch conduction occurs only when nOE is LOW, establishing a low-impedance path between corresponding A and B terminals.

It operates strictly in the 4.5–5.5 V supply range with static ICC ≤3 μA and supports bidirectional signal flow without direction control logic. The 1.7 pF input capacitance and 3.4 pF off-state I/O capacitance minimize loading on high-speed data lines.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - ensures compatibility with 5 V TTL and CMOS logic systems without level-shifting.
R_ON	5–7 Ω at VCC = 4.5 V, II = 64 mA - enables low-loss signal pass-through for 3.3 V/5 V digital buses up to 10 MHz.
t_en/t_dis	1.0–5.4 ns / 1.0–4.7 ns - supports fast bus arbitration and hot-swap isolation in real-time peripheral interfaces.
ESD HBM	>2000 V - meets industrial-grade handling requirements without external protection diodes.
C_I	1.7 pF - minimizes capacitive loading on clock or data lines in high-frequency address/data multiplexing.
Propagation Delay	0.25 ns - preserves signal integrity in sub-nanosecond timing-critical paths like CPU-to-peripheral interconnects.

Pinout & Package

CBT3125DB,112 uses the SOT337-1 (SSOP14) package: plastic shrink small outline, 14 leads, 5.3 mm body width, 0.65 mm lead pitch, and gull-wing surface-mount configuration.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13 (1OE–4OE)	Active-low enable control	Each independently gates one switch; HIGH disables, LOW enables A↔B conduction.
2, 5, 9, 12 (1A–4A)	Data input A-side	Bidirectional terminal; connects to source/microcontroller/bus driver side of signal path.
3, 6, 8, 11 (1B–4B)	Data output B-side	Bidirectional terminal; connects to load/peripheral/memory side of signal path.
7 (GND)	Ground reference	Common return for all switch channels and internal logic; must be low-impedance.
14 (VCC)	Supply voltage	Power rail for internal FET bias and input buffers; requires local 100 nF decoupling.

Key Features

Feature	Design Value
Standard '125'-type pinout	Enables drop-in replacement for legacy 74LVC1G125, 74AUP1G125, and other quad buffer/bus switch footprints.
5 Ω typical ON resistance	Reduces voltage drop and signal distortion across switched data/address lines at 5 V operation.
TTL-compatible inputs	Accepts standard 0.8 V/2.0 V VIH/VIL thresholds - eliminates need for external level translators in mixed-voltage systems.
Latch-up immunity >500 mA	Ensures robust operation under transient overvoltage or ground-bounce conditions per JESD78 Class II.

Applications

PCI Bus Isolation

ISA Expansion Slot Switching

Use Scenario: Isolating add-in cards from main system bus during hot-plug insertion or power sequencing.

IC Role / Device Role / Timing Role: Quad SPST analog switch enabling/disabling four independent data/address lanes synchronously via OE signals.

Use Value: Prevents bus contention and back-driving during card insertion while maintaining sub-nanosecond propagation delay for timing-critical transfers.

Use Scenario: Dynamically routing memory-mapped I/O or DMA channels between multiple ISA peripherals.

IC Role / Device Role / Timing Role: Bidirectional bus switch providing channel-selectable connectivity between CPU and legacy expansion devices.

Use Value: Eliminates need for discrete logic gating; 5 Ω R_ON preserves signal rise/fall times across 8-bit parallel buses operating up to 8 MHz.

Memory Address Multiplexing

Microcontroller Peripheral Sharing

Use Scenario: Sharing a single SRAM or Flash address bus among multiple microcontrollers in a multi-master embedded system.

IC Role / Device Role / Timing Role: Low-capacitance analog switch isolating address lines (A0–A13) between masters and memory device.

Use Value: 3.4 pF off-state capacitance prevents crosstalk and ghost addressing; 1.7 pF input capacitance avoids timing skew on critical address setup paths.

Use Scenario: Allowing two microcontrollers to share a common UART, SPI, or parallel LCD interface without hardware conflict.

IC Role / Device Role / Timing Role: Direction-agnostic signal gate controlled by master arbitration logic to route TX/RX, MOSI/MISO, or data/control lines.

Use Value: Enables seamless peripheral handover with <5 ns enable/disable latency - critical for deterministic real-time communication handshaking.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC1G125GW,125	Single-channel, SC-70-5 package; R_ON = 12 Ω typical; no SSOP14 footprint.	Requires four separate placements for quad functionality; higher R_ON increases voltage drop at 24 mA drive.	Select when board space is constrained and channel independence outweighs footprint compatibility.
SN74CBT16212DGGR	12-bit, TSSOP56 package; R_ON = 4 Ω; higher ICC (12 μA); wider VCC range (4.5–5.5 V).	Overkill for 4-signal routing; larger footprint and layout complexity for simple isolation tasks.	Select only when scaling to ≥8 switched lines and shared enable control is acceptable.

Compared with 74LVC1G125GW,125 and SN74CBT16212DGGR, CBT3125DB,112 uniquely balances quad-channel integration, SSOP14 pinout compatibility, 5 Ω R_ON, and ultra-low 3 μA ICC - making it optimal for space-constrained, low-power, legacy-bus-compatible designs.

Availability

CBT3125DB,112 is available at Aetrix Electronics and suitable for PCI bus isolation, ISA expansion slot switching, and memory address multiplexing requiring stable component supply, long-term lifecycle support, and SSOP14 footprint consistency.

Supply support for CBT3125DB,112 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, mobile, and computing applications.

CBT3125DB,112 belongs to Nexperia's CBT family of FET bus switches - engineered specifically for low-ON-resistance, high-speed digital signal routing in legacy and mixed-voltage bus architectures.

FAQ

Is CBT3125DB,112 pin-compatible with standard '125' logic devices?

Yes - it uses the industry-standard '125' pinout (1OE, 1A, 1B, 2OE, 2A, 2B, etc.) in SSOP14 (SOT337-1), matching physical layout and signal assignment of 74-series quad buffer devices. No PCB redesign is needed for drop-in replacement in existing '125'-footprint designs.

What is the maximum recommended operating frequency for CBT3125DB,112?

The device supports up to 10 MHz operation with 50 pF load capacitance, as verified in Table 9 of the datasheet. Its 0.25 ns propagation delay and 3.4 pF off-state capacitance ensure signal integrity on digital buses up to this frequency - beyond which transmission-line effects dominate.

Can unused nOE inputs be left floating?

No - per Table 5 Note [1], all unused control inputs must be tied to VCC or GND to prevent undefined switching states and excessive ICC. Floating nOE pins may cause partial turn-on of FETs, increasing leakage and degrading noise immunity.

Does CBT3125DB,112 support 3.3 V logic levels on its I/O ports?

Yes - although VCC must be 4.5–5.5 V, the device passes 3.3 V signals bidirectionally with minimal attenuation due to its 5–7 Ω R_ON. Input thresholds (VIH = 2.0 V, VIL = 0.8 V) are fully compatible with 3.3 V TTL outputs driving the nOE pins.

CBT3125DB,112 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: 74CBT

Package/Case:: 14-SSOP (0.209", 5.30mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: Bus Switch

Circuit:: 1 x 1:1

Independent Circuits:: 4

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:: 14-SSOP

CBT3125DB,112 FAQ

1.How can I place an order for CBT3125DB,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for CBT3125DB,112 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 CBT3125DB,112 reliable?

The price and inventory of CBT3125DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3125DB,112 is usually 5 days.

3.What payment methods are accepted for CBT3125DB,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3125DB,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CBT3125DB,112?

CBT3125DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CBT3125DB,112 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 CBT3125DB,112?

For technical support, including CBT3125DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3125DB,112 requirements.

6.How does Aetrix verify that CBT3125DB,112 is sourced from the original manufacturer or authorized distributors?

All CBT3125DB,112 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 CBT3125DB,112 meets industry standards.

7.What is the process for return or replacement of CBT3125DB,112?

All CBT3125DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3125DB,112, 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 CBT3125DB,112 part is unused and in its original packaging.

Return procedure for CBT3125DB,112:

1.Submit a request within 90 days.

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

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