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NXP Semiconductors CBT3126DB,118
- Part No.:
- CBT3126DB,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CBT3126DB,118.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,289
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Product details
Overview
CBT3126DB,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 A-B switches, each enabled by a dedicated OE input, 5 Ω typical ON resistance at 4.5 V, sub-0.25 ns propagation delay, and operation across −40 °C to +85 °C - used in address/data bus isolation and hot-swap I/O buffering.
For engineers reviewing the CBT3126DB,118 datasheet, CBT3126DB,118 pinout, CBT3126DB,118 application, or CBT3126DB,118 equivalent, key selection criteria include guaranteed 5 V supply compatibility, low ON-resistance matching across channels, fast enable/disable timing (1.6–5.4 ns), and SSOP14 package thermal performance with 5.5 mW/K derating above 70 °C.
Technical Context
The CBT3126DB,118 implements four independent single-pole single-throw (SPST) FET switches using NMOS pass transistors with integrated level-shifting circuitry to ensure TTL-compatible input thresholds. Each channel operates bidirectionally with no inherent directionality - signal flow depends solely on external voltage differentials between A and B terminals.
Switch control is strictly active-HIGH: an OE pin driven HIGH connects its corresponding A-B path; LOW disconnects it with <3.4 pF off-state capacitance. The device draws only 3 µA quiescent supply current and includes latch-up protection exceeding 500 mA per JESD78 Class II Level A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation within standard 5 V TTL rail tolerances without regulation overhead. |
| ON Resistance | 5 Ω max at VCC = 4.5 V, II = 64 mA - enables minimal voltage drop (<320 mV) under full 64 mA load per channel. |
| Propagation Delay | 0.25 ns max - supports >1 GHz signal integrity in high-speed data paths without timing skew penalties. |
| Enable/Disable Time | 1.6–4.5 ns enable, 1.0–5.4 ns disable - allows precise synchronous gating of burst-mode data transfers. |
| Off-State Capacitance | 3.4 pF max - limits crosstalk and maintains signal rise/fall times in dense PCB layouts. |
| ESD Protection | HBM >2000 V, MM >200 V, CDM >1000 V - meets industrial handling requirements without external protection diodes. |
| Operating Temperature | −40 °C to +85 °C - qualified for extended industrial ambient conditions without derating. |
Pinout & Package
CBT3126DB,118 is housed in a plastic shrink small outline package (SSOP14) with 14 leads, 5.3 mm body width, and 0.65 mm lead pitch (SOT337-1). Pin 1 is index-marked; pins are numbered counterclockwise from top-left corner when viewed top-down with marking dot at top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 4OE, 10OE, 13OE | Output Enable inputs | Active-HIGH control lines - drive HIGH to connect respective A-B channel; LOW disables with high-impedance isolation. |
| 1A–4A, 2A–5A, 9A–12A | A-side I/O terminals | Bidirectional signal ports - electrically identical to B-side; no internal direction biasing. |
| 3B–6B, 8B–11B | B-side I/O terminals | Paired with A pins (e.g., 1A ↔ 3B); same electrical characteristics and voltage tolerance as A pins. |
| VCC (Pin 14) | Positive supply | Must be decoupled locally; powers internal level shifters and switch drivers - not connected to signal paths. |
| GND (Pin 7) | Ground reference | Return path for supply and all switch currents - requires low-inductance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent switching | Four isolated A-B paths allow simultaneous, asynchronous control - eliminates bus contention in multi-master systems. |
| 5 Ω low ON resistance | Ensures <1% signal attenuation at 50 Ω system impedance - preserves logic margins in terminated backplanes. |
| TTL-compatible inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V - interfaces directly with legacy 74LS/74ALS logic without level translators. |
| Sub-nanosecond timing | tpd ≤ 0.25 ns, ten ≤ 4.5 ns - enables cycle-accurate gating in DDR clock domains and high-frequency test equipment. |
| Latch-up immunity | Exceeds 500 mA per JESD78 Class II Level A - prevents destructive latch-up during transient overvoltage events. |
Applications
| Memory Address Bus Isolation | Hot-Swap I/O Buffering |
|---|---|
Use Scenario: Isolating CPU address lines from multiple memory banks during dynamic bank selection in embedded controllers. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling/disabling address propagation with nanosecond-level timing precision. Use Value: Prevents address glitches during bank transitions while maintaining full 5 V logic swing integrity across all 4 channels. |
Use Scenario: Protecting host controller I/O pins during live insertion/removal of peripheral modules in industrial PLC backplanes. IC Role / Device Role / Timing Role: Signal gate that isolates unpowered peripherals from active bus lines until power sequencing completes. Use Value: Eliminates bus contention and ESD injection risk during hot-swap events with <3.4 pF off-capacitance and >2000 V HBM rating. |
| PCI/PCIe Slot Detection Interface | Digital Test Equipment Signal Routing |
Use Scenario: Detecting presence and configuration of add-in cards via dedicated IDSEL lines in PCI-compliant systems. IC Role / Device Role / Timing Role: Low-latency multiplexer enabling host readback of card ID bits only when slot is asserted. Use Value: Delivers <0.25 ns propagation delay to meet PCI setup/hold timing budgets without adding clock skew. |
Use Scenario: Reconfiguring signal paths between DUT, pattern generator, and measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: Channel-selectable signal bridge supporting bidirectional waveform injection and capture. Use Value: Maintains signal fidelity up to 1 GHz due to 5 Ω RON and <3.4 pF CIO(off), minimizing reflection and distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3126PWR | Same 14-pin TSSOP package (SOT402-1), 5.5 Ω RON max, but rated for 4.5–5.5 V only - no extended voltage margin. | Identical functional behavior; lower thermal dissipation (TSSOP vs SSOP) but tighter 4.4 mm body width limits board routing. | Select when footprint space is constrained and thermal load is light; verify layout clearance for 0.65 mm pitch. |
| 74LVC1G3157GW,125 | Single-channel SPDT switch in SC-70 package; 6 Ω RON, 3.3 V only (1.65–5.5 V), 3.5 ns enable time - not quad or pin-compatible. | Requires four discrete units and additional logic for independent OE control - increases BOM count and layout area. | Choose only for ultra-low-power 3.3 V systems where quad integration is unnecessary and board area is secondary to supply flexibility. |
Compared with SN74CBT3126PWR, CBT3126DB,118 offers identical switching performance in a thermally superior SSOP14 package with wider body for easier rework; versus 74LVC1G3157GW,125, it delivers true quad integration with synchronized enable timing - reducing control logic complexity and interconnect inbus-isolation designs.
Availability
CBT3126DB,118 is available at Aetrix Electronics and suitable for memory subsystem isolation, hot-swap I/O buffering, and high-speed test instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for CBT3126DB,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 CBT3126DB,118 belongs to NXP's legacy CBT (CrossBar Technology) family of high-speed CMOS bus switches, engineered specifically for low-latency, bidirectional signal routing in 5 V digital systems with strict timing and noise immunity requirements.
FAQ
What is the maximum continuous current per switch in the CBT3126DB,118?
The CBT3126DB,118 supports a maximum continuous switch current of 128 mA per channel, as specified in the Absolute Maximum Ratings table. This rating applies under steady-state conditions with proper PCB thermal management and remains valid across the full −40 °C to +85 °C operating temperature range. Exceeding this current may cause thermal runaway or permanent damage to the internal FET structure.
Does the CBT3126DB,118 require external pull-up or pull-down resistors on its OE inputs?
No, the CBT3126DB,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 connection to standard 5 V logic outputs. However, per the datasheet, 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.
Can the CBT3126DB,118 operate reliably at 3.3 V supply voltage?
No, the CBT3126DB,118 is not characterized or guaranteed for operation at 3.3 V. Its recommended operating conditions specify VCC = 4.5 V to 5.5 V, and static/dynamic parameters (e.g., RON, tpd, ten) are only validated within that range. At 3.3 V, ON resistance rises significantly (>15 Ω), propagation delay degrades, and input thresholds may fail to meet TTL compatibility - use 74LVC-series alternatives for 3.3 V systems.
How does the CBT3126DB,118 handle bidirectional signal flow between A and B terminals?
The CBT3126DB,118 implements true bidirectional analog switching: there is no internal directionality or driver circuitry between A and B pins. When enabled, current flows freely in either direction based on external voltage differential - making it ideal for data bus isolation where signals propagate both ways. The 5 Ω RON and <3.4 pF CIO(off) are symmetric for A→B and B→A paths.
Is the SSOP14 package of the CBT3126DB,118 RoHS compliant and lead-free?
Yes, the CBT3126DB,118 in SOT337-1 (SSOP14) package is RoHS compliant and lead-free, consistent with NXP's product environmental compliance program. The device meets EU Directive 2011/65/EU and carries the "Pb-free" marking per NXP's packaging standards. Full material declarations and compliance documentation are available through NXP's official product page and Aetrix Electronics' quality portal.
CBT3126DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74CBT
- Package/Case:
- 14-SSOP (0.209", 5.30mm 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-SSOP
CBT3126DB,118 FAQ
1.How can I place an order for CBT3126DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3126DB,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 CBT3126DB,118 reliable?
The price and inventory of CBT3126DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3126DB,118 is usually 5 days.
3.What payment methods are accepted for CBT3126DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3126DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3126DB,118?
CBT3126DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3126DB,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 CBT3126DB,118?
For technical support, including CBT3126DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3126DB,118 requirements.
6.How does Aetrix verify that CBT3126DB,118 is sourced from the original manufacturer or authorized distributors?
All CBT3126DB,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 CBT3126DB,118 meets industry standards.
7.What is the process for return or replacement of CBT3126DB,118?
All CBT3126DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3126DB,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 CBT3126DB,118 part is unused and in its original packaging.
Return procedure for CBT3126DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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