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Nexperia USA Inc. CBT3257ABQ,115
- Part No.:
- CBT3257ABQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
CBT3257ABQ,115.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:472
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Product details
Overview
CBT3257ABQ,115 from Nexperia is a quad 1-of-2 bus switch IC with active-Low output enable (OE), 5 Ω typical ON resistance, <5.2 ns enable time, and operation across -40 °C to +85 °C at 4.5–5.5 V supply. It routes four independent A-port signals to either of two B-port terminals per channel in high-speed digital interconnects such as FPGA I/O expansion or memory multiplexing.
For engineers reviewing the CBT3257ABQ,115 datasheet, CBT3257ABQ,115 pinout, CBT3257ABQ,115 application, or CBT3257ABQ,115 equivalent, key selection criteria include low ON-resistance matching, TTL-compatible control inputs tolerant to 5.5 V, sub-5 ns switching timing, thermal-enhanced DHVQFN16 packaging, and latch-up immunity per JESD78 Class II Level A.
Technical Context
The CBT3257ABQ implements four independent single-pole double-throw (SPDT) analog/digital bus switches, each controlled by a shared select (S) input and global OE. Its pass-transistor architecture enables bidirectional signal flow between A and B ports without level-shifting or buffering.
Switching behavior follows strict truth table logic: OE = LOW enables routing (S = LOW → A→B1; S = HIGH → A→B2); OE = HIGH forces all channels into high-impedance off-state. Input clamping and ESD protection (HBM >2000 V, CDM >1000 V) support robust board-level integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5 Ω typical at VCC = 4.5 V, enabling minimal voltage drop (<25 mV at 5 mA) for signal integrity in 3.3 V/5 V systems |
| Propagation Delay | ≤0.25 ns (A↔B path), ensuring negligible latency in high-speed data routing applications |
| Enable Time | 1.4–5.2 ns (OE→output), supporting tight timing budgets in synchronous bus arbitration |
| Supply Voltage | 4.5–5.5 V, compatible with standard 5 V TTL logic rails and industrial power domains |
| Operating Temp | -40 °C to +85 °C, validated for use in industrial control and embedded computing environments |
| ESD Protection | HBM >2000 V, CDM >1000 V, reducing risk of field failure during handling and PCB assembly |
| Input Tolerance | Control inputs tolerate up to 5.5 V regardless of VCC, simplifying mixed-voltage interface design |
Pinout & Package
DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, no leads, exposed thermal pad (non-soldered or GND-connected), 16-terminal layout optimized for high-density PCB routing and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S (Select) | Global channel routing control: LOW selects B1 path, HIGH selects B2 path for all four channels |
| 2 | 2A | Channel 2 bidirectional signal port - connects to system data bus or peripheral I/O |
| 3 | 3B2 | Channel 3 B2 output/input terminal - routed to secondary peripheral or alternate memory bank |
| 4 | 2B2 | Channel 2 B2 output/input terminal - used for dual-bank memory addressing or redundant signal paths |
| 5 | 3B1 | Channel 3 B1 output/input terminal - connects to primary peripheral interface or main data lane |
| 6 | 2B1 | Channel 2 B1 output/input terminal - standard path for high-priority I/O or clock distribution |
| 7 | 4A | Channel 4 bidirectional signal port - supports fourth independent data line or test access point |
| 8 | 1A | Channel 1 bidirectional signal port - commonly used for configuration or status signaling |
| 9 | 4B2 | Channel 4 B2 output/input terminal - enables dynamic reconfiguration of signal routing topology |
| 10 | 1B2 | Channel 1 B2 output/input terminal - provides alternate path for failover or diagnostics |
| 11 | 4B1 | Channel 4 B1 output/input terminal - primary connection for main functional path |
| 12 | 1B1 | Channel 1 B1 output/input terminal - default route for critical control signals |
| 13 | OE | Active-Low output enable - disables all switches when HIGH, isolating A/B ports electrically |
| 14 | GND | Ground reference - must be connected to system 0 V plane; thermal pad may be left floating or tied to GND |
| 15 | VCC | Positive supply - powers internal logic and switch transistors; bypass capacitor required near pin |
| 16 | - | Thermal pad (non-electrical) - improves thermal performance but has no circuit function unless soldered to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ON resistance | 5 Ω typical ensures <1% signal attenuation at 50 mA, preserving logic margins in 5 V systems |
| Bidirectional signal routing | Pass-transistor architecture allows identical performance for A→B or B→A direction without polarity constraints |
| TTL-compatible control inputs | VIH ≤ 2.0 V and VIL ≥ 0.8 V enable direct drive from legacy 5 V microcontrollers without level shifters |
| Overvoltage-tolerant OE/S pins | Withstand 5.5 V regardless of VCC, permitting safe interfacing with higher-voltage control logic |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level A, preventing destructive latch-up under transient overvoltage |
Applications
| FPGA I/O Expansion | Memory Multiplexing |
|---|---|
Use Scenario: Expanding limited FPGA GPIO count by dynamically routing shared data lines to multiple peripherals via software-controlled S/OE signals. IC Role / Device Role / Timing Role: Quad SPDT bus switch providing real-time, low-latency signal path selection between FPGA banks and external devices. Use Value: Eliminates need for discrete logic or CPLDs; <5.2 ns enable time aligns with FPGA clock domains up to 200 MHz. | Use Scenario: Sharing a single memory controller bus among two distinct SRAM or Flash devices using address-based routing. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling simultaneous read/write access to alternate memory banks without bus contention. Use Value: 5 Ω ON resistance maintains signal rise/fall times below 1 ns, preserving setup/hold timing for 100 MHz parallel memory interfaces. |
| Industrial Sensor Hub | Test Equipment Signal Routing |
Use Scenario: Aggregating analog/digital outputs from eight sensors onto four shared ADC or MCU input lines using time-division multiplexing. IC Role / Device Role / Timing Role: Low-leakage (±1 μA) analog switch isolating unused sensor channels to prevent crosstalk and offset drift. Use Value: -40 °C to +85 °C rating and 5.5 V input tolerance allow direct integration into unregulated industrial sensor nodes. | Use Scenario: Reconfiguring signal paths inside automated test equipment to route DUT signals to different measurement instruments based on test plan. IC Role / Device Role / Timing Role: High-reliability bus switch enabling repeatable, low-distortion signal routing with traceable impedance control. Use Value: HBM >2000 V and CDM >1000 V ESD ratings reduce calibration drift and false-fail events during probe contact cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 1-of-2 bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3257PWR | Same 5 Ω RON and 4.5–5.5 V operation, but SOIC-16 package (SOT109-1); 10.0 mm × 3.9 mm vs. DHVQFN's 3.5 mm × 2.5 mm | Larger footprint limits use in space-constrained portable or modular test gear | Select when board area is not constrained and through-hole or standard surface-mount assembly is preferred |
| 74LVC1G3157GW,125 | Single-channel variant in SC-88 (SOT363); requires four units for quad functionality; RON = 6 Ω, VCC = 1.65–5.5 V | Higher component count increases BOM complexity and PCB routing overhead | Select only when voltage flexibility below 4.5 V is required and density is secondary to supply range |
Compared with SN74CBT3257PWR, CBT3257ABQ,115 saves >75% board area and improves thermal performance via exposed pad; versus 74LVC1G3157GW,125, it delivers integrated quad functionality with matched timing and reduced layout risk.
Availability
CBT3257ABQ,115 is available at Aetrix Electronics and suitable for FPGA I/O expansion, memory multiplexing, industrial sensor hubs, and test equipment signal routing requiring stable component supply across extended temperature ranges.
Supply support for CBT3257ABQ,115 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 leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components for industrial, automotive, and consumer markets.
The CBT3257A product line delivers ultra-low-resistance, low-latency bus switches optimized for high-speed digital signal routing in space- and power-constrained embedded systems.
FAQ
What is the maximum continuous current per switch channel?
The CBT3257ABQ,115 supports up to 128 mA continuous current per switch 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.
Can the OE and S inputs be driven directly from a 3.3 V microcontroller?
Yes - the OE and S inputs are overvoltage tolerant up to 5.5 V and have TTL-compatible thresholds (VIH ≤ 2.0 V, VIL ≥ 0.8 V), allowing direct connection to 3.3 V GPIO without level-shifting circuitry while maintaining reliable switching behavior at VCC = 4.5–5.5 V.
Is the thermal pad on the DHVQFN16 package required to be soldered?
No - the exposed thermal pad (terminal 1 index area) has no electrical function. Per Nexperia documentation, it may remain unsoldered, be left floating, or be connected to GND. If soldered, the land must not create a short to adjacent terminals and should be isolated from signal traces.
Does the CBT3257ABQ,115 support hot insertion or live swapping?
No - the device lacks explicit hot-swap protection features such as slew-rate control or back-drive immunity. While its overvoltage-tolerant inputs improve robustness, unpowered insertion into a live 5 V bus may exceed absolute maximum ratings and is not recommended without external current-limiting or sequencing circuitry.
CBT3257ABQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74CBT
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- 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:
- 16-DHVQFN (2.5x3.5)
CBT3257ABQ,115 FAQ
1.How can I place an order for CBT3257ABQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3257ABQ,115 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 CBT3257ABQ,115 reliable?
The price and inventory of CBT3257ABQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3257ABQ,115 is usually 5 days.
3.What payment methods are accepted for CBT3257ABQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3257ABQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3257ABQ,115?
CBT3257ABQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3257ABQ,115 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 CBT3257ABQ,115?
For technical support, including CBT3257ABQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3257ABQ,115 requirements.
6.How does Aetrix verify that CBT3257ABQ,115 is sourced from the original manufacturer or authorized distributors?
All CBT3257ABQ,115 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 CBT3257ABQ,115 meets industry standards.
7.What is the process for return or replacement of CBT3257ABQ,115?
All CBT3257ABQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3257ABQ,115, 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 CBT3257ABQ,115 part is unused and in its original packaging.
Return procedure for CBT3257ABQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CBT3257ABQ,115 Tags
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