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NXP Semiconductors CBT3126D,118
- Part No.:
- CBT3126D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CBT3126D,118.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,808
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Product details
Overview
CBT3126D,118 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 four independent analog/digital switches (1A↔1B through 4A↔4B), 5 Ω typical ON resistance at 4.5 V, sub-0.25 ns propagation delay, and operates across −40 °C to +85 °C - used in address/data bus isolation and hot-swap I/O buffering.
For engineers reviewing the CBT3126D,118 datasheet, CBT3126D,118 pinout, CBT3126D,118 application, or CBT3126D,118 equivalent, key selection criteria include guaranteed 5 V supply operation, TTL-level OE control compatibility, low ON-resistance matching across channels, fast enable/disable timing (1.6–5.4 ns), and SO14 package thermal performance up to 500 mW at 70 °C.
Technical Context
The CBT3126D,118 implements four independent single-pole single-throw (SPST) FET transmission gates, each controlled by a dedicated TTL-compatible Output Enable (OE) input. Switch conduction occurs only when the corresponding OE is HIGH, disconnecting A–B paths when LOW - enabling precise per-line bus gating without contention.
Its architecture delivers rail-to-rail analog/digital signal pass-through with minimal distortion: ON resistance remains stable across input voltage (0–5 V), leakage current stays below ±1 µA, and off-state capacitance is limited to 3.4 pF - critical for maintaining signal integrity in high-frequency data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures reliable operation within standard 5 V TTL/CMOS logic rails |
| ON Resistance | 5 Ω max at VCC = 4.5 V, II = 64 mA - enables low-loss signal coupling with <100 mV drop at 100 mA |
| Propagation Delay | 0.25 ns max - supports >1 GHz signal switching without timing skew between channels |
| Enable/Disable Time | 1.6–4.5 ns (enable), 1.0–5.4 ns (disable) - allows tight synchronization of bus access windows |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded and computing applications |
| ESD Protection | HBM >2000 V, MM >200 V, CDM >1000 V - withstands handling and board-level ESD events |
| Input Leakage | ±1 µA max - prevents unintended loading of upstream drivers or pull-up networks |
Pinout & Package
CBT3126D,118 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | TTL-compatible enable inputs - drive HIGH to connect respective A–B channel; LOW disables isolation |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | First-side bidirectional I/O terminals - connect to source bus or controller interface |
| 3, 6, 8, 11 | 1B, 2B, 3B, 4B | Second-side bidirectional I/O terminals - connect to destination bus or peripheral |
| 7 | GND | Ground reference for all internal circuitry and signal return path |
| 14 | VCC | Positive supply - powers internal level-shifting and switch bias; must be decoupled locally |
Key Features
| Feature | Design Value |
|---|---|
| Standard '126-type pinout | Direct replacement for legacy 74LVC1G126-based bus buffers - no PCB redesign needed |
| 5 Ω switch connection | Ensures <100 mV voltage drop at 20 mA, preserving logic thresholds and analog signal fidelity |
| Minimal propagation delay | 0.25 ns max eliminates timing budget impact in high-speed parallel interfaces like PCI or memory buses |
| Latch-up protection | Exceeds 500 mA per JEDEC JESD78 Class II Level A - immune to destructive latch-up under transient overcurrent |
| TTL-compatible inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V - interoperates directly with 5 V TTL, LVTTL, and mixed-voltage controllers |
Applications
| PCI Bus Isolation | Hot-Swap I/O Buffering |
|---|---|
Use Scenario: Isolating add-in card address/data lines from motherboard during insertion/removal in PCI-compliant systems. IC Role / Device Role / Timing Role: Quad SPST gate controlling four independent bidirectional data lanes; enables/disables per-lane connectivity synchronously via OE signals. Use Value: Prevents bus contention and signal corruption during hot-plug events while maintaining <0.25 ns inter-lane skew for timing-critical transfers. |
Use Scenario: Protecting backplane I/O ports from voltage transients and ground bounce during live module insertion in telecom shelf systems. IC Role / Device Role / Timing Role: Bidirectional signal isolator placed between connector and ASIC; OE driven by system supervisor to sequence power-up. Use Value: Achieves <5 ns enable/disable response to supervisor commands, ensuring safe power sequencing and eliminating glitch propagation to downstream logic. |
| Memory Address Multiplexing | Test Access Port (TAP) Signal Routing |
Use Scenario: Sharing address lines between multiple memory banks in microcontroller-based industrial controllers with limited pin count. IC Role / Device Role / Timing Role: Channel-selectable bus switch enabling one memory bank at a time; OE signals coordinated by memory controller state machine. Use Value: 5 Ω ON resistance maintains signal rise/fall times below 1 ns, supporting >100 MHz address strobe rates without edge degradation. |
Use Scenario: Dynamically routing JTAG TCK/TMS/TDI/TDO signals between multiple FPGA or ASIC test domains on a shared debug header. IC Role / Device Role / Timing Role: Four independent signal path selectors - each OE assigned to a domain-specific test enable, preventing cross-talk during boundary scan. Use Value: Sub-1 ns propagation delay preserves JTAG timing margins; 3.4 pF off-capacitance minimizes signal reflection on 50 Ω TAP traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16212DGGR | 12-channel, 3.3 V only, higher channel count but no 5 V tolerance | Requires level-shifting in 5 V systems; suited for dense 3.3 V backplanes | Select only if migrating to 3.3 V infrastructure and needing >4 channels |
| 74LVC1G126GW,125 | Single-channel, SC-70 package, identical 5 V operation but not quad-integrated | Requires four discrete units - increases layout area and BOM count | Choose when space-constrained designs need per-channel flexibility or partial enable control |
Compared with SN74CBT16212DGGR and 74LVC1G126GW,125, the CBT3126D,118 uniquely delivers quad-channel 5 V operation in a single SO14 footprint with verified 5 Ω ON resistance and <0.25 ns propagation - optimizing board density, power efficiency, and timing predictability for industrial 5 V bus architectures.
Availability
CBT3126D,118 is available at Aetrix Electronics and suitable for PCI bus isolation, hot-swap I/O buffering, memory address multiplexing, test access port routing, and industrial controller signal gating requiring stable component supply across extended temperature ranges.
Supply support for CBT3126D,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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The CBT3126D,118 belongs to NXP's legacy logic bus switch family, engineered specifically for high-speed, low-distortion signal routing in 5 V digital systems where deterministic timing and robust ESD/latch-up immunity are required.
FAQ
What is the maximum continuous current rating per switch in the CBT3126D,118?
The CBT3126D,118 supports a maximum continuous switch current (ISW) of 128 mA per channel, as specified in the Absolute Maximum Ratings table. This rating applies under recommended operating conditions (VCC = 4.5–5.5 V, Tamb = −40 °C to +85 °C) and ensures reliable conduction without thermal runaway or parametric shift. Exceeding this value risks permanent damage or degraded ON resistance stability.
Does the CBT3126D,118 require external pull-up or pull-down resistors on its OE inputs?
No, the CBT3126D,118 does not require external pull-up or pull-down resistors on its OE inputs. Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) allow direct interfacing with standard 5 V logic outputs. However, the datasheet explicitly states that all unused control inputs must be held at VCC or GND - so unconnected OE pins must be tied to either rail to prevent floating states and ensure predictable switch behavior.
Can the CBT3126D,118 operate with a 3.3 V supply voltage?
No, the CBT3126D,118 is not rated for 3.3 V operation. Its recommended operating supply range is strictly 4.5 V to 5.5 V, and its Absolute Maximum Rating for VCC is −0.5 V to +7.0 V - but functionality is only guaranteed within the 4.5–5.5 V window. At 3.3 V, ON resistance rises significantly (>20 Ω), propagation delay increases, and input thresholds may not be met, leading to unreliable switching or failure to enable.
What is the thermal derating behavior of the CBT3126D,118 in its SO14 package?
The CBT3126D,118 in the SO14 (SOT108-1) package has a total power dissipation (Ptot) limit of 500 mW at Tamb ≤ 70 °C. Above 70 °C, Ptot derates linearly at 8 mW/K - meaning at 85 °C ambient, maximum allowable power drops to 380 mW. This derating is defined in Table 4 and reflects the package's thermal impedance per JESD51-7, ensuring safe junction temperature under sustained load.
Is the CBT3126D,118 pin-compatible with other members of the CBT3126 family?
The CBT3126D,118 (SO14) shares the same pin configuration and function mapping as the CBT3126DB (SSOP14) and CBT3126PW (TSSOP14) variants, but differs from the CBT3126DS (SSOP16), which uses a 16-pin layout with NC pins and relocated OE signals. Therefore, CBT3126D,118 is pin-compatible with SO14/SSOP14/TSSOP14 versions but not with the SSOP16 variant - PCB layout must match the 14-pin SOT108-1 footprint.
CBT3126D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74CBT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,118 FAQ
1.How can I place an order for CBT3126D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3126D,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 CBT3126D,118 reliable?
The price and inventory of CBT3126D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3126D,118 is usually 5 days.
3.What payment methods are accepted for CBT3126D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3126D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3126D,118?
CBT3126D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3126D,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 CBT3126D,118?
For technical support, including CBT3126D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3126D,118 requirements.
6.How does Aetrix verify that CBT3126D,118 is sourced from the original manufacturer or authorized distributors?
All CBT3126D,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 CBT3126D,118 meets industry standards.
7.What is the process for return or replacement of CBT3126D,118?
All CBT3126D,118 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3126D,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 CBT3126D,118 part is unused and in its original packaging.
Return procedure for CBT3126D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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