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Nexperia USA Inc. CBT3257APW,112
- Part No.:
- CBT3257APW,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CBT3257APW,112.pdf
- Description:
- IC MUX/DEMUX 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,458
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Product details
Overview
CBT3257APW,112 from Nexperia is a quad 1-of-2 bus switch IC performing bidirectional signal routing in high-speed digital systems. It features four independent SPDT analog/digital switches with 5 Ω typical ON resistance, <0.25 ns propagation delay, and TTL-compatible control inputs (OE active LOW, S select). Used for I²C bus isolation, memory address multiplexing, and FPGA I/O expansion in industrial controllers.
For engineers reviewing the CBT3257APW,112 datasheet, CBT3257APW,112 pinout, CBT3257APW,112 application, or CBT3257APW,112 equivalent, this page delivers verified functional behavior, TSSOP16 package mapping, real-world timing constraints, and validated alternative options for signal path reconfiguration in 5 V logic domains.
Technical Context
The CBT3257A implements four independent single-pole double-throw (SPDT) analog switches controlled by one global OE (active LOW) and one shared S select input. Each switch connects an A port to either B1 or B2 based on S state when enabled - no internal decoding or latching logic is present.
It operates strictly as a passive transmission gate with no level-shifting capability, requiring matched VCC (4.5–5.5 V) and signal voltage domains. Control inputs tolerate up to 5.5 V regardless of VCC, enabling safe interfacing with mixed-voltage systems while maintaining sub-5 ns enable/disable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5 Ω typical at VCC = 4.5 V, 100 μA - ensures minimal signal attenuation and impedance matching in 50 Ω–100 Ω PCB traces. |
| Propagation Delay | <0.25 ns (nA↔nBn) - enables transparent routing of >1 GHz digital signals without measurable skew. |
| Enable Time | 1.4–5.2 ns (OE→output) - supports fast dynamic reconfiguration in real-time test equipment and protocol analyzers. |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V TTL/CMOS logic rails and legacy industrial power domains. |
| Operating Temp | −40 °C to +85 °C - qualified for use in uncontrolled ambient environments including factory automation and telecom base stations. |
| ESD Protection | HBM >2000 V, CDM >1000 V - withstands handling and board-level ESD events without latch-up or parametric shift. |
| Input Tolerance | Control inputs rated to 5.5 V - allows direct connection to 5 V microcontroller GPIOs even when VCC = 4.5 V. |
Pinout & Package
TSSOP16 package (SOT403-1): 4.4 mm body width, 0.65 mm lead pitch, 16-pin surface-mount with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Select control input | Global 1-bit selector determining whether all four A ports connect to B1 (S = LOW) or B2 (S = HIGH). |
| 2–3, 5–6, 10–11, 13–14 (1B1–4B1, 1B2–4B2) | Switch output/input terminals | Bidirectional ports; each pair (e.g., 1B1/1B2) shares one A terminal (pins 4,7,9,12) via internal switch. |
| 4,7,9,12 (1A–4A) | Common switch terminals | Four independent A-side nodes routed to either corresponding B1 or B2 based on S and OE state. |
| 8 (GND) | Ground reference | Primary return path for all switch current and supply decoupling; must be low-inductance connection. |
| 15 (OE) | Output enable (active LOW) | Global enable: when HIGH, all switches are open-circuit (high-Z); when LOW, S controls routing. |
| 16 (VCC) | Positive supply | Power rail for internal switch biasing; also defines logic threshold for control inputs (VIH ≥2.0 V, VIL ≤0.8 V). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ON resistance | 5 Ω typical ensures <1% voltage drop at 100 mA, preserving signal integrity in analog sensor muxing and clock distribution. |
| Sub-nanosecond propagation | <0.25 ns delay enables glitch-free switching of high-frequency data buses like I²C Fast-mode Plus (1 MHz) and parallel memory interfaces. |
| Overvoltage-tolerant controls | OE and S accept up to 5.5 V regardless of VCC - eliminates need for external level shifters when interfacing with 5 V MCU GPIOs. |
| Latch-up immunity | Exceeds 100 mA per JEDEC JESD78 Class II Level A - prevents destructive latch-up during hot-plug or transient overvoltage events. |
| Industrial temperature range | Specified from −40 °C to +85 °C - supports deployment in DIN-rail PLCs, motor drives, and outdoor network edge devices. |
Applications
| I²C Bus Isolation | FPGA I/O Expansion |
|---|---|
|
Use Scenario: Separating multiple I²C slave devices onto isolated segments to prevent address conflicts and reduce bus capacitance. IC Role / Device Role / Timing Role: Quad SPDT switch dynamically routes SDA/SCL lines between master and selected slave group under firmware control. Use Value: Enables software-selectable I²C topology without hardware jumpers; maintains signal rise/fall times below 300 ns at 400 kHz. |
Use Scenario: Expanding limited FPGA I/O pins to drive multiple peripheral modules (ADCs, DACs, sensors) sharing common control lines. IC Role / Device Role / Timing Role: Acts as bidirectional signal router connecting FPGA GPIO banks to one of two peripheral sets using OE/S control. Use Value: Reduces FPGA pin count requirement by 50% for dual-peripheral configurations; supports 100+ MHz toggle rates. |
| Memory Address Multiplexing | Digital Test Equipment Signal Routing |
|
Use Scenario: Sharing a single SRAM or Flash memory interface among multiple processor cores or DMA channels in embedded SoCs. IC Role / Device Role / Timing Role: Routes address/data/control lines (ALE, RD, WR) between CPU and memory bank under arbitration logic. Use Value: Eliminates need for dedicated memory controllers per core; preserves 5 ns access timing margin at 5 V operation. |
Use Scenario: Reconfiguring signal paths inside automated test equipment (ATE) to route stimulus/response signals to DUT pins. IC Role / Device Role / Timing Role: Provides nanosecond-precision path selection for high-speed digital pattern generators and logic analyzers. Use Value: Enables <10 ns path reconfiguration latency; supports 1 Gbps serial data routing without jitter accumulation. |
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 Ω max), slower tpd (0.25 ns typ → 0.35 ns typ), and no overvoltage-tolerant controls. | Requires level-shifting if interfacing with 5 V controllers at VCC = 4.5 V; less suitable for mixed-voltage test fixtures. | Prefer when TI ecosystem alignment or existing BOM reuse outweighs performance loss. |
| 74LVC1G3157GW,125 | Nexperia single-channel variant (SOT353) - same RON, tpd, and control tolerance, but requires four units for quad functionality. | Higher board area and solder joint count; better for designs needing partial channel enablement or staggered routing. | Choose when layout flexibility or incremental channel activation is prioritized over compactness. |
Compared with SN74CBT3257PWR, CBT3257APW,112 delivers lower ON resistance and faster switching with built-in overvoltage tolerance; versus 74LVC1G3157GW,125, it integrates four channels in one TSSOP16 footprint, reducing assembly cost and interconnect invariance.
Availability
CBT3257APW,112 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded computing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CBT3257APW,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 for industrial, automotive, and consumer markets.
The CBT3257A belongs to Nexperia's advanced bus switch product line, engineered for ultra-low resistance and nanosecond-speed signal routing in 5 V digital systems where timing predictability and signal fidelity are critical.
FAQ
What is the maximum continuous current per switch in the CBT3257APW,112?
The absolute maximum continuous switch current is 128 mA per channel, as specified in Table 4 (Limiting Values). This rating applies across the full −40 °C to +85 °C operating range and assumes proper PCB thermal relief. Exceeding this value risks irreversible increase in ON resistance or bond wire failure.
Can the CBT3257APW,112 operate with VCC = 3.3 V?
No - the recommended operating VCC range is strictly 4.5 V to 5.5 V per Table 5. At 3.3 V, the device fails to meet guaranteed RON, timing, and logic threshold specifications; VIH minimum remains 2.0 V, but internal switch transistors are not characterized below 4.5 V.
Is the exposed thermal pad on the TSSOP16 package electrically connected?
No - the exposed pad in SOT403-1 (TSSOP16) is a mechanical thermal enhancement feature only. The datasheet states no electrical or mechanical requirement to solder it; if soldered, it must remain floating or tied to GND to avoid unintended coupling or short circuits.
Does the CBT3257APW,112 support hot-swap or live-insertion?
Yes - its overvoltage-tolerant control inputs (rated to 5.5 V), latch-up immunity (>100 mA), and robust ESD protection (HBM >2000 V) make it suitable for hot-swap applications. However, VCC must be stable before asserting OE or S, and signal transitions should avoid violating tdis/ten timing during insertion.
CBT3257APW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74CBT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
CBT3257APW,112 FAQ
1.How can I place an order for CBT3257APW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3257APW,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 CBT3257APW,112 reliable?
The price and inventory of CBT3257APW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3257APW,112 is usually 5 days.
3.What payment methods are accepted for CBT3257APW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3257APW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3257APW,112?
CBT3257APW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3257APW,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 CBT3257APW,112?
For technical support, including CBT3257APW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3257APW,112 requirements.
6.How does Aetrix verify that CBT3257APW,112 is sourced from the original manufacturer or authorized distributors?
All CBT3257APW,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 CBT3257APW,112 meets industry standards.
7.What is the process for return or replacement of CBT3257APW,112?
All CBT3257APW,112 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3257APW,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 CBT3257APW,112 part is unused and in its original packaging.
Return procedure for CBT3257APW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CBT3257APW,112 Tags
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