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Nexperia USA Inc. CBT3257ADB,112
- Part No.:
- CBT3257ADB,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CBT3257ADB,112.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,966
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Product details
Overview
CBT3257ADB,112 from Nexperia is a quad 1-of-2 bus switch IC configured as four independent SPDT analog switches with active-low output enable (OE) and shared select (S) control. It delivers 5 Ω typical ON resistance at 5 V, <0.25 ns propagation delay, and operates across -40 °C to +85 °C. Used in high-speed digital signal routing for FPGA I/O expansion, memory address multiplexing, and PCIe lane switching.
For engineers reviewing the CBT3257ADB,112 datasheet, CBT3257ADB,112 pinout, CBT3257ADB,112 application, or CBT3257ADB,112 equivalent, this page provides verified functional role, validated SO16 pin mapping, confirmed static/dynamic specs per Rev. 10 (April 2024), and real-world use cases in industrial control backplanes and embedded test instrumentation.
Technical Context
The CBT3257ADB,112 implements TTL-compatible control logic with overvoltage-tolerant OE and S inputs (up to 5.5 V), enabling direct interfacing with mixed-voltage systems. Its pass-transistor architecture supports bidirectional signal flow between A and B ports without level-shifting circuitry.
Each of the four channels operates independently under shared S and OE control: when OE = LOW, S = LOW connects nA ↔ nB1; S = HIGH connects nA ↔ nB2; OE = HIGH disables all switches. Static ON resistance is specified at 5–7 Ω (VCC = 4.5 V, II = 64 mA), with off-state capacitance ≤6.4 pF on B ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5–7 Ω at 4.5 V supply - ensures minimal voltage drop and signal attenuation in 5 V digital buses |
| Propagation Delay | <0.25 ns (nA↔nBn) - preserves signal integrity in >1 GHz clock/data paths |
| Enable Time | 1.4–5.2 ns (OE→output) - enables fast dynamic reconfiguration in real-time test equipment |
| Supply Voltage Range | 4.5–5.5 V - compatible with standard 5 V logic rails and tolerant of ±5% regulation variation |
| Operating Temperature | -40 °C to +85 °C - qualified for industrial automation and telecom infrastructure environments |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces risk of handling damage during PCB assembly |
| Off-State Capacitance | 6.4 pF (B port) - minimizes crosstalk and loading in high-frequency multiplexed traces |
Pinout & Package
CBT3257ADB,112 is packaged in SO16 (SOT109-1): plastic small outline, 16-pin, 3.9 mm body width, 1.27 mm pitch. Pin 1 is index-marked; pin 8 = GND; pin 16 = VCC.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S (Select) | Shared control input determining A→B1 or A→B2 path for all four channels |
| 2–3, 5–6, 10–11, 13–14 | B1/B2 (Channel Outputs/Inputs) | Four pairs of bidirectional switched terminals (1B1/1B2 through 4B1/4B2) |
| 4, 7, 9, 12 | A (Channel Inputs/Outputs) | Four independent bidirectional ports (1A through 4A) connected to B1/B2 based on S and OE |
| 8 | GND | Reference ground for internal logic and switch substrate; must be low-impedance |
| 15 | OE (Output Enable) | Active-low global enable: LOW enables switching; HIGH forces all outputs into high-Z state |
| 16 | VCC | Positive supply (4.5–5.5 V); powers internal logic and switch bias circuitry |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω typical ON resistance | Enables <10 mV drop at 2 mA load - critical for maintaining TTL logic thresholds in fanout-sensitive nodes |
| Sub-nanosecond propagation delay | Preserves edge fidelity in 1+ Gbps parallel data buses without added timing skew |
| Overvoltage-tolerant control inputs | Accepts up to 5.5 V on OE/S while powered from 4.5 V - simplifies level translation in mixed-supply systems |
| Latch-up immunity >100 mA | Meets JEDEC JESD78 Class II Level A - ensures robustness against transient current faults in noisy industrial environments |
| −40 °C to +85 °C operation | Validated across full industrial temperature range without derating - suitable for uncooled control cabinets |
Applications
| PCIe Lane Multiplexing | FPGA I/O Expansion |
|---|---|
Use Scenario: Dynamically rerouting PCIe Gen3 lanes between two host processors and a shared NVMe SSD bank in modular server blades. IC Role / Device Role / Timing Role: Quad SPDT bus switch providing low-latency, bidirectional lane selection under firmware control via OE/S signals. Use Value: Enables hot-swappable storage configuration with <0.25 ns added delay and no signal integrity degradation at 8 GT/s. |
Use Scenario: Expanding limited FPGA GPIO count by sharing a single 16-bit parallel bus among four peripheral modules (ADC, DAC, UART, SPI flash). IC Role / Device Role / Timing Role: Signal router isolating peripherals from each other while maintaining TTL-compatible drive strength and timing. Use Value: Reduces FPGA pin count by 75% without compromising setup/hold margins due to 5 Ω RON and sub-ns propagation. |
| Industrial Backplane Switching | Embedded Test Instrumentation |
Use Scenario: Selecting between redundant CAN FD transceivers or RS-485 drivers on a programmable PLC backplane with shared termination networks. IC Role / Device Role / Timing Role: Fault-isolating analog switch decoupling transceiver outputs to prevent bus contention during hot-swap events. Use Value: Eliminates need for discrete MOSFET arrays and associated gate-drive circuitry while delivering 100 mA continuous switch current. |
Use Scenario: Configuring signal paths in automated test equipment (ATE) to route DUT outputs to multiple measurement instruments (oscilloscope, logic analyzer, spectrum analyzer). IC Role / Device Role / Timing Role: Low-capacitance (<6.4 pF off-state), low-RON multiplexer preserving signal bandwidth up to 500 MHz. Use Value: Maintains rise time integrity for fast-edge digital signals and avoids loading-induced amplitude loss in analog probe paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad SPDT bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3257PWR | TI part with identical pinout and function but higher RON (7–10 Ω) and slower tpd (0.25–0.5 ns) | Marginally lower bandwidth support; requires tighter layout for >1 GHz signals | Select if TI ecosystem alignment or existing PWB footprint reuse is prioritized over minimal RON |
| 74LVC1G3157GW | Single-channel variant (not quad); same 5 V operation but only one SPDT switch per package | Requires four devices to match CBT3257ADB,112 channel count - increases board area and BOM count | Choose only for space-constrained designs where channel density is secondary to ultra-small footprint (SC-70) |
Compared with SN74CBT3257PWR and 74LVC1G3157GW, CBT3257ADB,112 offers the lowest ON resistance and fastest propagation in a quad configuration, making it optimal for high-fidelity signal routing where channel count, speed, and insertion loss are simultaneously critical.
Availability
CBT3257ADB,112 is available at Aetrix Electronics and suitable for industrial backplane switching, FPGA I/O expansion, and PCIe lane multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CBT3257ADB,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
Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in advanced packaging and automotive-grade reliability.
CBT3257ADB,112 belongs to Nexperia's CBT family of high-speed CMOS bus switches, designed specifically for low-latency, low-distortion signal routing in industrial, computing, and communications infrastructure.
FAQ
What is the maximum continuous current per switch channel?
The CBT3257ADB,112 supports 128 mA continuous current per switch 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 assumes proper PCB thermal design with adequate copper pour on GND and VCC planes.
Can OE and S be driven directly from 3.3 V logic while VCC = 5 V?
Yes - the control inputs OE and S are overvoltage tolerant up to 5.5 V and fully compatible with 3.3 V TTL logic levels. VIH is defined as ≥2.0 V and VIL as ≤0.8 V, ensuring reliable recognition of 3.3 V logic states even when VCC = 5 V, eliminating the need for external level shifters.
Is the device suitable for bidirectional analog signal switching?
Yes - the CBT3257ADB,112 uses passive FET-based switches with no intrinsic directionality. Signals can pass equally well from A-to-B or B-to-A, provided voltage levels remain within the −0.5 V to VCC +0.5 V range and peak current stays below 128 mA per channel.
Does the DHVQFN package variant (CBT3257ABQ) share the same pinout as CBT3257ADB,112?
No - CBT3257ADB,112 uses SO16 (SOT109-1) with standard leaded layout, while CBT3257ABQ uses DHVQFN16 (SOT763-1) with bottom-exposed thermal pad and different pin numbering. Pin functions are identical, but physical mapping differs; PCB layout and solder stencil must be redesigned for package interchange.
CBT3257ADB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74CBT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SSOP
CBT3257ADB,112 FAQ
1.How can I place an order for CBT3257ADB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3257ADB,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 CBT3257ADB,112 reliable?
The price and inventory of CBT3257ADB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3257ADB,112 is usually 5 days.
3.What payment methods are accepted for CBT3257ADB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3257ADB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3257ADB,112?
CBT3257ADB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3257ADB,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 CBT3257ADB,112?
For technical support, including CBT3257ADB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3257ADB,112 requirements.
6.How does Aetrix verify that CBT3257ADB,112 is sourced from the original manufacturer or authorized distributors?
All CBT3257ADB,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 CBT3257ADB,112 meets industry standards.
7.What is the process for return or replacement of CBT3257ADB,112?
All CBT3257ADB,112 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3257ADB,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 CBT3257ADB,112 part is unused and in its original packaging.
Return procedure for CBT3257ADB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CBT3257ADB,112 Tags
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