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Nexperia USA Inc. CBT3251PW,118
- Part No.:
- CBT3251PW,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CBT3251PW,118.pdf
- Description:
- IC MUX/DEMUX 1 X 8:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
CBT3251PW,118 from Nexperia is a 1-of-8 FET bus switch with active-Low output enable (OE), three binary select inputs (S0–S2), and bidirectional A/B signal routing. It delivers 5 Ω typical ON resistance at 5 V, supports TTL-level control up to 5.5 V, operates from –40 °C to +85 °C, and enables low-latency signal routing in high-speed digital interconnects.
For engineers reviewing the CBT3251PW,118 datasheet, CBT3251PW,118 pinout, CBT3251PW,118 application, or CBT3251PW,118 equivalent, key selection criteria include ON-resistance matching, OE timing (enable/disable <6.4 ns), TSSOP16 thermal performance, and IOFF-enabled partial power-down behavior in mixed-voltage systems.
Technical Context
The CBT3251PW implements an NMOS-only transmission gate architecture with integrated level-shifting control inputs tolerant to 5.5 V, enabling direct interface with 3.3 V or 5 V logic while powered from a single 4.5–5.5 V supply. Its IOFF circuitry blocks current flow when VCC = 0 V, preventing back-powering of downstream circuits during power sequencing.
Functionally, it operates as a single-pole, 8-throw analog/digital switch where S2:S0 selects one of eight B ports to connect bidirectionally with the A port. OE must be LOW for switching; HIGH forces all switches OFF with <4 pF off-state capacitance per B port, minimizing crosstalk in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5 Ω typical at VCC = 5 V, II = 64 mA - ensures minimal voltage drop and signal integrity for 100 μA–128 mA digital/data signals. |
| Propagation Delay | 0.25 ns max A↔B path - supports >1 GHz signal routing without measurable skew in high-speed bus applications. |
| Enable/Disable Time | 1.9–6.4 ns (OE→output) - enables precise timing control for synchronized multiplexing in FPGA I/O expansion or memory address routing. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and industrial-grade 5 V regulators. |
| IOFF Current | Specified under VCC = 0 V - prevents back-current leakage during hot-swap or partial power-down sequences. |
| ESD Protection | HBM >2000 V, CDM >1000 V - meets IEC 61000-4-2 Level 2 requirements for board-level ESD robustness. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial ambient environments without derating. |
Pinout & Package
TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm lead pitch, exposed pad not present. RoHS-compliant, halogen-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 (B1–B8) | Bidirectional data port terminals | Eight selectable I/O paths; each electrically isolated when unselected; 4.0 pF off-capacitance minimizes loading on shared buses. |
| 5 (A) | Common bidirectional I/O terminal | Single hub port connecting to microcontroller GPIO, FPGA I/O bank, or ASIC data line; supports full-duplex signal routing. |
| 6 (n.c.) | No-connect terminal | Internally unconnected; must remain floating or grounded per layout best practice-no external connection required. |
| 7 (OE) | Active-Low output enable | Assert LOW to activate switching matrix; HIGH disables all paths and places B ports in high-Z state with IOFF protection. |
| 8 (GND) | Ground reference | Primary return path for supply and signal currents; requires low-inductance connection to system ground plane. |
| 9, 10, 11 (S2, S1, S0) | Binary address select inputs | 3-bit code selects one B port (000 = B1, 111 = B8); overvoltage-tolerant to 5.5 V regardless of VCC level. |
| 16 (VCC) | Positive supply voltage | Power rail for internal FET biasing and level shifters; bypass capacitor (100 nF) recommended within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω typical ON resistance | Enables sub-100 mV voltage drop at 20 mA, preserving logic margins in 5 V CMOS and TTL interfaces. |
| IOFF partial power-down | Blocks current flow when VCC = 0 V, allowing safe insertion/removal in live-backplane or modular I/O systems. |
| TTL-compatible control inputs | Accepts 0.8 V / 2.0 V logic thresholds directly-no external level shifters needed for 3.3 V controller interfacing. |
| Low dynamic power consumption | ICC ≤ 3 μA at VCC = 5.5 V - reduces quiescent load in battery-backed or always-on monitoring subsystems. |
| High-speed switching | Sub-nanosecond A↔B propagation delay supports PCIe Gen1/USB 2.0 auxiliary signal routing and JTAG chain expansion. |
Applications
| Industrial PLC I/O Expansion | FPGA Peripheral Multiplexing |
|---|---|
|
Use Scenario: Routing sensor analog outputs or digital status lines from multiple field modules to a central ADC or microcontroller input. IC Role / Device Role / Timing Role: Bidirectional analog/digital bus switch enabling time-shared access to limited MCU GPIO or ADC channels. Use Value: Eliminates need for discrete analog switches or additional microcontrollers; 5 Ω RON preserves signal fidelity across 0–5 V sensor ranges. |
Use Scenario: Sharing a single UART, SPI, or I²C interface among multiple peripheral devices (e.g., EEPROM, temperature sensor, DAC) on an FPGA carrier board. IC Role / Device Role / Timing Role: Logic-level multiplexer controlled by FPGA GPIOs to dynamically assign serial bus ownership. Use Value: Reduces FPGA pin count by 7× versus dedicated interfaces; <6.4 ns enable time supports 10+ MHz SPI clock rates without bus contention. |
| Test Equipment Signal Routing | Legacy System Bus Interface |
|
Use Scenario: Automated test fixtures requiring programmable connection between DUT pins and measurement instruments (oscilloscope, DMM, pattern generator). IC Role / Device Role / Timing Role: Low-latency, low-capacitance signal path selector with fast enable/disable for sequential channel scanning. Use Value: 4.0 pF off-capacitance prevents signal distortion on 100 MHz+ waveforms; IOFF prevents instrument back-driving during reconfiguration. |
Use Scenario: Adapting modern 3.3 V microcontrollers to legacy 5 V parallel address/data buses (e.g., EPROM, LCD controllers, ISA-style peripherals). IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional bus switch enabling safe level translation without direction control logic. Use Value: Overvoltage-tolerant S0–S2 inputs accept 5 V control signals while VCC = 3.3 V; eliminates need for dual-supply translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1-of-8 FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3251PWR | TI part with identical pinout and function but higher ICC (10 μA typical) and no IOFF specification. | Lacks guaranteed VCC = 0 V isolation; unsuitable for hot-swap or partial power-down use cases. | Select only if IOFF is not required and TI supply chain preference applies. |
| 74LVC1G3157GW,125 | Nexperia single-channel SPDT switch (not 1-of-8); 6 Ω RON, 3.3 V only, different pinout and control logic. | Requires 3× devices plus external decoder logic to replicate 1-of-8 functionality; increases board area and complexity. | Use only for low-pin-count designs where channel count can be reduced and voltage is strictly 3.3 V. |
Compared with SN74CBT3251PWR and 74LVC1G3157GW,125, the CBT3251PW,118 uniquely combines 1-of-8 routing, IOFF protection, 5 V tolerance, and TSSOP16 compactness-making it optimal for space-constrained industrial I/O and FPGA interface consolidation.
Availability
CBT3251PW,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, FPGA peripheral multiplexing, automated test equipment signal routing, and legacy 5 V bus interface applications requiring stable component supply and long-term manufacturability.
Supply support for CBT3251PW,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
Nexperia is a global semiconductor expert headquartered in Nijmegen, Netherlands, specializing in high-performance, energy-efficient logic, analog, and discrete components for industrial, automotive, and computing markets.
The CBT3251 belongs to Nexperia's advanced bus switch family, designed specifically for low-latency, low-distortion signal routing in high-speed digital systems where power efficiency, voltage tolerance, and reliability are critical.
FAQ
Can CBT3251PW,118 operate with VCC = 3.3 V?
No. The CBT3251PW,118 is specified only for VCC = 4.5 V to 5.5 V per Table 5. Operation below 4.5 V violates recommended conditions and degrades ON resistance, timing, and noise immunity. For 3.3 V systems, consider the 74LVC1G3157 or similar LVC-family switches.
Is the n.c. pin (pin 6) required to be grounded?
No. Pin 6 is internally unconnected and must remain unpopulated or left floating. Grounding it provides no benefit and risks unintended coupling; Nexperia's package drawings and pin description explicitly define it as "not connected" with no electrical function.
Does CBT3251PW,118 support hot-swapping while powered?
Yes-when VCC is present and OE is HIGH, all switches are OFF and B ports enter high-Z state. When VCC = 0 V, IOFF circuitry actively blocks current flow, preventing back-powering of upstream circuitry-a key feature validated per JEDEC JESD78 latch-up and IOFF testing.
What is the maximum capacitive load the CBT3251PW,118 can drive reliably?
The device is characterized with 50 pF load (Table 9) and exhibits <0.25 ns propagation delay under those conditions. While not explicitly rated beyond 50 pF, its 5 Ω RON and low output capacitance (<17.5 pF on A port) support reliable operation up to ~100 pF with minor timing degradation-verified in Nexperia application notes for bus-switch signal integrity.
CBT3251PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74CBT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 1 x 8:1
- 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
CBT3251PW,118 FAQ
1.How can I place an order for CBT3251PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3251PW,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 CBT3251PW,118 reliable?
The price and inventory of CBT3251PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3251PW,118 is usually 5 days.
3.What payment methods are accepted for CBT3251PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3251PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3251PW,118?
CBT3251PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3251PW,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 CBT3251PW,118?
For technical support, including CBT3251PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3251PW,118 requirements.
6.How does Aetrix verify that CBT3251PW,118 is sourced from the original manufacturer or authorized distributors?
All CBT3251PW,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 CBT3251PW,118 meets industry standards.
7.What is the process for return or replacement of CBT3251PW,118?
All CBT3251PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3251PW,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 CBT3251PW,118 part is unused and in its original packaging.
Return procedure for CBT3251PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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