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NXP Semiconductors CBT3126PW,118
- Part No.:
- CBT3126PW,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CBT3126PW,118.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,297
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Product details
Overview
CBT3126PW,118 from NXP Semiconductors is a quad FET bus switch with independent 14-pin TSSOP package, 5 Ω typical ON resistance at 4.5 V, TTL-compatible inputs, and −40 °C to +85 °C operating range. It enables/disables four bidirectional signal paths in high-speed digital buses such as address/data lines in microcontroller peripherals and memory interfaces.
For engineers reviewing the CBT3126PW,118 datasheet, CBT3126PW,118 pinout, CBT3126PW,118 application, or CBT3126PW,118 equivalent, key selection criteria include ON-resistance matching, enable timing (enable time ≤4.5 ns), off-state capacitance (<3.4 pF), latch-up immunity (>500 mA), and TSSOP14 thermal derating (5.5 mW/K above 70 °C).
Technical Context
The CBT3126PW,118 implements four independent single-pole single-throw (SPST) analog switches using N-channel FETs, each controlled by a dedicated OE input. Switch conduction occurs only when OE is HIGH, disconnecting A–B paths when OE is LOW.
It operates strictly within 4.5 V to 5.5 V supply range and supports bidirectional signal flow with no polarity dependence. Static characteristics include ±1 µA input leakage, 3 µA max ICC, and 1.7 pF input capacitance - critical for minimizing loading on high-impedance source nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5 Ω typical at VCC = 4.5 V - ensures minimal voltage drop and signal attenuation in 5 V logic buses |
| Propagation Delay | ≤0.25 ns - preserves signal integrity in >1 GHz digital timing paths |
| Enable Time | 1.6–4.5 ns - enables fast bus arbitration and dynamic channel selection |
| Off-State Capacitance | 3.4 pF - reduces crosstalk and maintains high-frequency isolation between disabled channels |
| Supply Voltage Range | 4.5–5.5 V - compatible with standard 5 V TTL/CMOS systems without level-shifting |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded control and communications equipment |
| ESD Protection | HBM >2000 V, MM >200 V, CDM >1000 V - withstands handling and board-level ESD events without latch-up |
Pinout & Package
TSSOP14 (SOT402-1) package: plastic thin shrink small outline, 14 leads, body width 4.4 mm, lead pitch 0.65 mm, 1.1 mm max height - optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Independent enable inputs | Active-HIGH control per switch; drives corresponding A–B path ON/OFF without affecting others |
| 1A–4A, 1B–4B | Bidirectional signal terminals | Pass signals in either direction when enabled; no internal bias or directionality |
| VCC | Positive supply | Must be 4.5–5.5 V; powers internal FET gates and level translators |
| GND | Ground reference | Return path for all switch currents and logic thresholds; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Standard '126-type pinout | Direct replacement for legacy 74LVC1G126 and similar quad buffer footprints in existing designs |
| 5 Ω switch connection | Low RON minimizes insertion loss and timing skew across all four channels simultaneously |
| TTL-compatible input levels | VIH ≥2.0 V and VIL ≤0.8 V allow direct interfacing with 5 V TTL outputs without external pull-ups |
| Latch-up protection | Exceeds 500 mA per JEDEC JESD78 Class II Level A - prevents destructive latch-up under transient overcurrent |
| Minimal propagation delay | Sub-0.25 ns tpd supports clean pass-through of fast edges in DDR, PCI, and parallel bus applications |
Applications
| Memory Address Multiplexing | Microcontroller Peripheral Isolation |
|---|---|
Use Scenario: Selectively route address lines between two memory banks sharing a common data bus in an 8-bit MCU system. IC Role / Device Role / Timing Role: Quad FET bus switch enabling/disabling four address bits (A0–A3) under software-controlled OE signals. Use Value: Eliminates need for discrete logic gates or complex CPLD routing; achieves <0.25 ns delay matching across all four lines. | Use Scenario: Isolate UART, SPI, or I²C peripheral pins during system reset or power-down sequencing. IC Role / Device Role / Timing Role: Bidirectional signal gate preventing back-driving of powered-down peripherals while preserving signal integrity. Use Value: Prevents current leakage and bus contention; leverages 3.4 pF off-capacitance to maintain >100 MHz isolation bandwidth. |
| PCI Bus Signal Steering | Digital Test Access Port Switching |
Use Scenario: Dynamically reconfigure PCI slot signal paths for functional test or hot-swap diagnostics in industrial backplanes. IC Role / Device Role / Timing Role: Low-RON switch for steering AD[31:0], C/BE#[3:0], and PAR signals between test controller and target device. Use Value: 5 Ω RON ensures <50 mV voltage drop at 10 mA drive; meets PCI SIG signal integrity requirements. | Use Scenario: Route JTAG TCK/TMS/TDI/TDO signals between multiple ASICs on a shared debug bus in multi-core SoC validation. IC Role / Device Role / Timing Role: Independent OE-controlled switching of four JTAG lines to isolate devices during boundary-scan testing. Use Value: Sub-5 ns enable/disable times support real-time JTAG state machine transitions without clock stretching. |
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 |
|---|---|---|---|
| SN74CBT1126PWR | Same 14-pin TSSOP package, 5 Ω RON, but specified for 4.5–5.5 V only; enable time 2.5–5.5 ns | Identical use in 5 V bus switching; slightly slower enable timing may affect tight arbitration windows | Valid alternative if layout reuse is required and enable timing margin allows ≥2.5 ns |
| 74LVC1G126GW,125 | Single-channel, SOT353-5 package; requires four units for quad function; RON = 16 Ω typical at 3.3 V | Not pin-compatible; higher RON and lower supply voltage limit it to 3.3 V systems only | Only suitable for new 3.3 V designs where board area and cost outweigh performance trade-offs |
Compared with SN74CBT1126PWR, the CBT3126PW,118 offers faster enable time (1.6–4.5 ns vs. 2.5–5.5 ns) and identical RON, making it preferable for time-critical bus arbitration. Against 74LVC1G126GW,125, it delivers true quad integration, lower RON, and 5 V compatibility - eliminating four separate placements and reducing BOM count.
Availability
CBT3126PW,118 is available at Aetrix Electronics and suitable for industrial control panels, automotive infotainment head units, and telecom baseband processing modules requiring stable component supply across extended temperature ranges.
Supply support for CBT3126PW,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 CBT3126PW,118 belongs to NXP's legacy high-speed bus switch family, designed specifically for low-latency, bidirectional signal routing in 5 V digital systems with stringent timing and ESD robustness requirements.
FAQ
What is the maximum continuous current rating per switch in the CBT3126PW,118?
The CBT3126PW,118 supports up to 128 mA continuous current through each individual switch, as defined in its Absolute Maximum Ratings table. This rating applies under recommended operating conditions (VCC = 4.5–5.5 V, Tamb = −40 °C to +85 °C) and assumes proper PCB thermal design. Exceeding this current may cause thermal stress or degradation of RON stability. The CBT3126PW,118 must not be operated beyond this limit even for short durations unless transient conditions are explicitly validated per JEDEC JESD78.
Does the CBT3126PW,118 require external pull-up or pull-down resistors on its OE inputs?
No, the CBT3126PW,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) ensure reliable recognition of standard 5 V logic levels. However, per datasheet Section 8, all unused OE inputs must be actively held at either VCC or GND to prevent floating states that could cause unintended switching or increased ICC. The CBT3126PW,118 itself contains no internal termination on OE pins.
Can the CBT3126PW,118 operate with a 3.3 V supply voltage?
No, the CBT3126PW,118 is not rated for 3.3 V operation. Its recommended operating supply voltage 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 below 4.5 V is not guaranteed. At 3.3 V, the CBT3126PW,118 exhibits significantly degraded RON (exceeding 22 Ω), unreliable enable timing, and potential failure to meet VIH/VIL thresholds. For 3.3 V systems, consider NXP's 74LVC series or similar 3.3 V–optimized bus switches instead of the CBT3126PW,118.
What is the thermal derating behavior of the CBT3126PW,118 in its TSSOP14 package?
The CBT3126PW,118 in TSSOP14 (SOT402-1) has a total power dissipation derating slope of 5.5 mW/K above 70 °C ambient, as specified in Table 4. At 85 °C ambient, its usable Ptot reduces from 500 mW to approximately 417.5 mW. This linear derating ensures safe operation under industrial temperature extremes. PCB layout must provide adequate copper area and thermal vias beneath the exposed pad (if present) to maintain junction temperature below 125 °C - the CBT3126PW,118's maximum allowable junction temperature.
Is the CBT3126PW,118 pin-compatible with the CBT3126D (SO14) variant?
Yes, the CBT3126PW,118 (TSSOP14) shares identical pin numbering and function mapping with the CBT3126D (SO14) variant, as confirmed in Figure 4 and Table 2 of the datasheet. Both use the same 14-pin configuration: pins 1, 4, 10, 13 for OE inputs; pins 2, 5, 9, 12 for A terminals; pins 3, 6, 8, 11 for B terminals; pin 7 for GND; and pin 14 for VCC. No PCB redesign is needed when migrating from SO14 to TSSOP14, though solder profile and reflow parameters must be adjusted for the thinner TSSOP package.
CBT3126PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74CBT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
CBT3126PW,118 FAQ
1.How can I place an order for CBT3126PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3126PW,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 CBT3126PW,118 reliable?
The price and inventory of CBT3126PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3126PW,118 is usually 5 days.
3.What payment methods are accepted for CBT3126PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3126PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3126PW,118?
CBT3126PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3126PW,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 CBT3126PW,118?
For technical support, including CBT3126PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3126PW,118 requirements.
6.How does Aetrix verify that CBT3126PW,118 is sourced from the original manufacturer or authorized distributors?
All CBT3126PW,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 CBT3126PW,118 meets industry standards.
7.What is the process for return or replacement of CBT3126PW,118?
All CBT3126PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3126PW,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 CBT3126PW,118 part is unused and in its original packaging.
Return procedure for CBT3126PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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