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NXP Semiconductors CBT3126D,112
- Part No.:
- CBT3126D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CBT3126D,112.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,252
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Product details
Overview
CBT3126D,112 from NXP Semiconductors is a quad FET bus switch with independent line control, designed for high-speed bidirectional signal routing in 5 V TTL-compatible digital systems. It features 5 Ω typical ON resistance at 4.5 V, sub-0.25 ns propagation delay, and operates across −40 °C to +85 °C. Each of its four switches disconnects when its dedicated Output Enable (OE) input is LOW, enabling precise per-line isolation in data buses and memory interfaces.
For engineers reviewing the CBT3126D,112 datasheet, CBT3126D,112 pinout, CBT3126D,112 application, or CBT3126D,112 equivalent, key selection criteria include guaranteed 5 V supply operation, low ON-resistance matching, nanosecond-scale enable/disable timing, and SO14 package compatibility with legacy '126-type layouts.
Technical Context
The CBT3126D,112 implements four independent single-pole single-throw (SPST) analog switches using integrated FETs, each controlled by a dedicated OE input. Its TTL-compatible inputs accept 0.8 V (VIL) and 2.0 V (VIH) thresholds, and it requires no external biasing-VCC supplies both logic control and switch conduction paths.
Switching behavior follows strict level-sensitive enable logic: an OE HIGH connects the corresponding A–B path with minimal voltage drop (<0.2 V at 30 mA), while OE LOW presents >10⁹ Ω off-isolation. All static and dynamic parameters-including RON, tpd, ten, and tdis-are fully specified over the full −40 °C to +85 °C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation within standard 5 V TTL/CMOS rail tolerances |
| ON Resistance | 5 Ω max at VCC = 4.5 V, II = 64 mA - enables low-loss signal pass-through with <320 mV drop at full rated current |
| Propagation Delay | 0.25 ns max - supports >1 GHz signal integrity in high-speed parallel bus applications |
| Enable Time | 4.5 ns max - guarantees rapid bus arbitration response under worst-case temperature and voltage |
| Disable Time | 5.4 ns max - ensures clean signal isolation during bus contention or power sequencing |
| ESD Protection | HBM >2000 V, MM >200 V, CDM >1000 V - meets industrial handling requirements without external protection |
| Operating Temperature | −40 °C to +85 °C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
CBT3126D,112 is supplied in SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Independent TTL-compatible enable inputs - each controls one A–B switch pair; LOW disables, HIGH enables |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | First-side bidirectional I/O terminals - connect to source/data lines (e.g., CPU address/data bus) |
| 3, 6, 8, 11 | 1B, 2B, 3B, 4B | Second-side bidirectional I/O terminals - connect to destination/peripheral lines (e.g., memory or peripheral interface) |
| 7 | GND | Ground reference for logic and switch conduction - must be low-impedance return path for all signals |
| 14 | VCC | 5 V supply for both logic control and FET channel conduction - powers internal level shifters and switch drivers |
Key Features
| Feature | Design Value |
|---|---|
| Standard '126-type pinout | Direct drop-in replacement for legacy 74LVC1G126 and 74ALVC162244-based bus buffers in existing SO14 layouts |
| 5 Ω switch connection | Minimizes insertion loss and timing skew across all four channels, critical for synchronous parallel bus timing budgets |
| Minimal propagation delay | Sub-0.25 ns tpd preserves signal edge fidelity in >1 Gbps aggregate throughput applications |
| Latch-up protection | Exceeds 500 mA per JESD78 Class II Level A - eliminates need for external current-limiting in fault-prone systems |
| TTL-compatible inputs | Accepts standard 5 V logic thresholds without level-shifting, simplifying integration with legacy microcontrollers and FPGAs |
Applications
| Memory Bus Isolation | PCI/ISA Local Bus Switching |
|---|---|
Use Scenario: Isolating DRAM address/data lines between two competing masters (e.g., CPU and DMA controller) to prevent bus contention. IC Role / Device Role / Timing Role: Quad SPST analog switch providing per-line enable-controlled signal path gating with nanosecond switching. Use Value: Eliminates need for tristate buffers and direction control logic; enables zero-latency bus handoff with <5.4 ns disable time. | Use Scenario: Dynamically routing shared ISA or PCI bus signals between multiple add-in cards or legacy peripherals. IC Role / Device Role / Timing Role: Bidirectional bus switch managing A/B side connectivity under host-controlled OE signals. Use Value: Supports hot-plug-like reconfiguration without system reset; maintains signal integrity via 5 Ω RON and <0.25 ns tpd. |
| Test Access Port Multiplexing | Legacy Microcontroller Peripheral Expansion |
Use Scenario: Sharing a single JTAG or boundary-scan test access port among multiple ASICs or FPGAs on a board. IC Role / Device Role / Timing Role: Signal-path selector enabling one device at a time to drive the TAP signals while others are isolated. Use Value: Reduces test connector count and PCB layer count; avoids signal reflections from unterminated stubs via high off-isolation (>10⁹ Ω). | Use Scenario: Expanding GPIO or parallel interface capability of an 8-bit microcontroller (e.g., 8051 or PIC) to drive multiple peripheral devices. IC Role / Device Role / Timing Role: Bidirectional data path extender allowing one set of MCU pins to serve multiple peripheral address/data buses. Use Value: Enables cost-effective peripheral multiplexing without software overhead or external transceivers; supports 5 V tolerant I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16212DGGR | 12-channel, TSSOP56 package, 3.3 V only, higher channel count but no direct pin mapping | Requires PCB redesign; suited for high-density 3.3 V systems, not 5 V drop-in replacement | Select only when scaling beyond 4 channels and operating at 3.3 V with space-constrained layout. |
| 74LVC1G3157GW,125 | Single-pole double-throw (SPDT), SC-70 package, 1.65–5.5 V supply, 10 Ω RON | Requires four discrete units and additional logic for quad independent control; lacks '126 pinout compatibility | Choose for ultra-low-power or mixed-voltage designs where per-channel flexibility outweighs layout efficiency. |
Compared with SN74CBT16212DGGR and 74LVC1G3157GW,125, the CBT3126D,112 delivers true quad independent control in a legacy-compatible SO14 footprint with optimized 5 V performance, lower RON, and faster enable timing-making it the preferred choice for retrofitting or maintaining 5 V industrial bus architectures.
Availability
CBT3126D,112 is available at Aetrix Electronics and suitable for memory bus isolation, PCI/ISA local bus switching, test access port multiplexing, and legacy microcontroller peripheral expansion requiring stable component supply and long-term industrial-grade availability.
Supply support for CBT3126D,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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The CBT3126D,112 belongs to NXP's legacy logic and bus switch product line, engineered specifically for high-speed, low-distortion signal routing in 5 V digital systems where pin compatibility, timing predictability, and robust ESD/latch-up performance are critical.
FAQ
What is the maximum continuous current rating per switch in the CBT3126D,112?
The CBT3126D,112 supports up to 128 mA continuous current through each individual switch, as specified in the Absolute Maximum Ratings table. This rating applies under recommended operating conditions (VCC = 4.5 V to 5.5 V, Tamb = −40 °C to +85 °C) and assumes proper PCB thermal design. Exceeding this current may degrade RON stability or trigger latch-up protection.
Does the CBT3126D,112 require external pull-up or pull-down resistors on its OE inputs?
No, the CBT3126D,112 does not require external pull-up or pull-down resistors on its OE inputs. Its TTL-compatible inputs have defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds, and all unused OE inputs must be held at either VCC or GND per the datasheet's recommended operating conditions. Internal input structures ensure stable logic levels without external biasing.
Can the CBT3126D,112 operate reliably at 3.3 V supply voltage?
No, the CBT3126D,112 is not characterized or guaranteed for 3.3 V operation. Its recommended operating supply is strictly 4.5 V to 5.5 V, and key parameters-including RON, tpd, and VIH/VIL-are only specified across that range. Attempting 3.3 V operation may result in undefined switching behavior, increased RON, or failure to meet timing specs.
What is the off-state capacitance (Cio(off)) specification for the CBT3126D,112?
The CBT3126D,112 has an off-state input/output capacitance (Cio(off)) of 3.4 pF typical, measured with VO = 3 V or 0 V and nOE = VCC. This low value minimizes capacitive loading on inactive bus segments, preserving signal rise/fall times and reducing crosstalk in high-density parallel interfaces.
Is the CBT3126D,112 pin-compatible with other members of the CBT3126 family such as CBT3126DB or CBT3126PW?
No, the CBT3126D,112 (SO14/SOT108-1) is not pin-compatible with CBT3126DB (SSOP14/SOT337-1) or CBT3126PW (TSSOP14/SOT402-1), despite sharing identical logic functionality and pin numbering. These variants differ in package dimensions, lead pitch, and mechanical footprint-requiring separate PCB layouts. Only same-package variants (e.g., CBT3126D and CBT3126DS in SSOP16) share pinouts within their respective packages.
CBT3126D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74CBT
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SO
CBT3126D,112 FAQ
1.How can I place an order for CBT3126D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3126D,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 CBT3126D,112 reliable?
The price and inventory of CBT3126D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3126D,112 is usually 5 days.
3.What payment methods are accepted for CBT3126D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3126D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3126D,112?
CBT3126D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3126D,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 CBT3126D,112?
For technical support, including CBT3126D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3126D,112 requirements.
6.How does Aetrix verify that CBT3126D,112 is sourced from the original manufacturer or authorized distributors?
All CBT3126D,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 CBT3126D,112 meets industry standards.
7.What is the process for return or replacement of CBT3126D,112?
All CBT3126D,112 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3126D,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 CBT3126D,112 part is unused and in its original packaging.
Return procedure for CBT3126D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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