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Nexperia USA Inc. CBT3251DB,118
- Part No.:
- CBT3251DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CBT3251DB,118.pdf
- Description:
- IC MUX/DEMUX 1 X 8:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,794
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Product details
Overview
CBT3251DB,118 from Nexperia is a 1-of-8 FET bus switch configured as a single-pole, 8-throw multiplexer/demultiplexer with active-Low output enable (OE), three binary select inputs (S0–S2), 5 Ω typical ON resistance at 5 V, ±1 μA input leakage, and operation across –40 °C to +85 °C. It routes one A-port signal bidirectionally to any of eight B-ports in high-speed digital data paths such as memory address/data bus isolation.
For engineers reviewing the CBT3251DB,118 datasheet, CBT3251DB,118 pinout, CBT3251DB,118 application, or CBT3251DB,118 equivalent, key selection criteria include TTL-compatible control interface, overvoltage-tolerant inputs up to 5.5 V, IOFF partial power-down capability, sub-6 ns enable/disable timing, and SO16 package compatibility with legacy board layouts.
Technical Context
The CBT3251DB,118 implements an NMOS-only transmission gate architecture enabling bidirectional, low-distortion signal switching without level-shifting. Its OE-controlled enable logic and 3-bit binary decoder (S2:S0) directly select one of eight B terminals to connect to the A terminal, supporting both multiplexing and demultiplexing modes within a single device.
All control inputs tolerate voltages up to 5.5 V independent of VCC, and the IOFF circuit ensures minimal leakage (<1 μA) when VCC = 0 V-critical for hot-swap and partial-power-down systems. Propagation delay remains below 0.25 ns (A↔Bn path), while enable/disable transitions are specified at 1.5–6.4 ns under 50 pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON Resistance | 5 Ω typical at VCC = 5 V, II = 64 mA - enables low-insertion-loss signal routing in 5 V TTL/CMOS buses |
| Propagation Delay (A↔Bn) | 0.25 ns max - supports >1 GHz digital switching without timing skew degradation |
| Enable Time (OE→Bn) | 1.5–5.6 ns - allows fast channel reconfiguration in burst-mode data transfer |
| Input Leakage Current | ±1 μA max at VCC = 5.5 V - minimizes loading on upstream drivers and preserves signal integrity |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V logic rails with 10% tolerance margin |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded and communications equipment |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces risk of handling damage during assembly and field service |
Pinout & Package
CBT3251DB,118 is supplied in SO16 (SOT109-1) package: plastic small outline, 16 leads, 3.9 mm body width, 1.27 mm lead pitch. Pin 1 index marked, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 12–15 (B1–B8) | Bidirectional I/O port | Eight selectable signal paths; each electrically identical and fully bidirectional with no direction pin required |
| 5 (A) | Common bidirectional I/O port | Single shared terminal connected to selected Bn port; supports mux or demux operation depending on signal flow |
| 6 (n.c.) | No-connect | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice |
| 7 (OE) | Active-Low output enable | Assert LOW to activate switch matrix; HIGH forces all paths into high-impedance OFF state |
| 8 (GND) | Ground reference | Return path for VCC and all signal currents; requires low-inductance PCB connection |
| 9–11 (S2, S1, S0) | Binary channel select | 3-bit address selects one of eight B ports; latched internally, no clock required |
| 16 (VCC) | Positive supply | Power rail for internal FET biasing; decoupling capacitor (100 nF) required within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω low-ON-resistance switch | Minimizes voltage drop and signal attenuation in 5 V data paths, preserving TTL logic margins |
| IOFF partial power-down | Prevents current backflow and maintains high-impedance isolation when VCC = 0 V-enables live insertion |
| Overvoltage-tolerant control inputs | Accepts up to 5.5 V on OE/S0–S2 regardless of VCC level-simplifies mixed-voltage system interfacing |
| Latch-up immunity >100 mA | Guarantees robust operation under transient fault conditions per JESD78 Class II Level A |
| Sub-6 ns enable/disable timing | Supports rapid channel switching in time-division multiplexed systems without introducing jitter |
Applications
| Memory Bus Isolation | PCI/ISA Address Decoding |
|---|---|
|
Use Scenario: Isolating DRAM address lines between two microcontrollers sharing a common memory space. IC Role / Device Role / Timing Role: Bidirectional 1-of-8 mux/demux that routes A-port signals to one of eight B-port memory banks under software-selectable control. Use Value: Enables dynamic memory partitioning without bus contention, leveraging <0.25 ns propagation delay to preserve setup/hold timing margins. |
Use Scenario: Selecting one of eight peripheral devices on a legacy ISA bus using decoded address bits. IC Role / Device Role / Timing Role: Address decoder front-end that maps 3-bit address lines (A0–A2) to individual device enable signals via B1–B8 outputs. Use Value: Replaces discrete logic gates with single-chip solution, reducing board area and eliminating fanout limitations of TTL buffers. |
| Test Equipment Signal Routing | Digital Logic Prototyping |
|
Use Scenario: Configurable signal path selection in automated test equipment (ATE) for routing DUT I/O to measurement instruments. IC Role / Device Role / Timing Role: High-fidelity analog/digital switch providing low-capacitance (<17.5 pF A-port CI), low-RON paths between test fixtures and DUT pins. Use Value: Maintains signal integrity up to 1 GHz due to <5 Ω RON and <4 pF off-state capacitance-critical for high-speed parametric testing. |
Use Scenario: Rapid interconnection of FPGA I/O banks to multiple sensor or actuator interfaces on a development board. IC Role / Device Role / Timing Role: Reconfigurable signal router allowing firmware-defined mapping of one FPGA pin to any of eight external nodes. Use Value: Eliminates manual jumper wiring; IOFF support permits safe reconfiguration while system is partially powered. |
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 | Higher ICC (10 μA typ), wider VCC range (4.5–5.5 V same), identical pinout and RON | TI version offers tighter production lot consistency but lacks Nexperia's IOFF guarantee at VCC = 0 V | Select if sourcing from TI-authorized channels is required; verify IOFF behavior in zero-VCC hot-swap scenarios |
| 74LVC1G3157GW,125 | Single-channel SPDT (not 1-of-8), lower RON (3 Ω), smaller XSON8 package, 1.65–5.5 V VCC | Requires eight devices to match CBT3251DB,118 functionality-increases board area and BOM count | Choose only for ultra-low-power, space-constrained designs where full 1-of-8 integration is not mandatory |
Compared with SN74CBT3251PWR and 74LVC1G3157GW,125, the CBT3251DB,118 uniquely balances 8-channel integration, guaranteed IOFF at 0 V, and industrial temperature range in a legacy-compatible SO16 footprint-making it optimal for retrofit and high-reliability industrial upgrades.
Availability
CBT3251DB,118 is available at Aetrix Electronics and suitable for memory bus isolation, legacy bus address decoding, automated test equipment signal routing, and digital prototyping requiring stable component supply and long-term industrial lifecycle support.
Supply support for CBT3251DB,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 delivering high-performance, reliable components for automotive, industrial, mobile, and computing applications, with leadership in logic, discrete, and MOSFET technologies.
The CBT3251DB,118 belongs to Nexperia's CBT (Crosspoint Bus Transceiver) family-designed specifically for low-latency, bidirectional signal routing in 5 V digital systems where signal integrity, power efficiency, and industrial reliability are critical.
FAQ
Is CBT3251DB,118 compatible with 3.3 V control logic?
No-CBT3251DB,118 requires VCC = 4.5–5.5 V and its control inputs (OE, S0–S2) are TTL-compatible with VIH ≥ 2.0 V and VIL ≤ 0.8 V. While inputs tolerate up to 5.5 V, they are not designed for direct 3.3 V logic drive without level translation, as 3.3 V may fall below guaranteed VIH under worst-case conditions.
Can CBT3251DB,118 be used in analog signal switching applications?
Yes-its 5 Ω RON, <17.5 pF input capacitance, and bidirectional architecture support low-distortion analog switching up to ~100 MHz. However, it lacks rail-to-rail input voltage range; maximum analog signal swing is limited to VCC – 0.3 V (e.g., 4.7 V peak-to-peak at VCC = 5 V).
What is the purpose of the n.c. pin (pin 6)?
Pin 6 is a no-connect terminal with no internal bond wire or circuit connection. It must remain unconnected on the PCB-neither grounded nor tied to VCC-to avoid mechanical stress on the package or unintended coupling. Its presence maintains SO16 mechanical symmetry and pin-count alignment with legacy footprints.
Does CBT3251DB,118 support hot-swap operation?
Yes-its IOFF circuitry actively blocks current flow when VCC = 0 V, preventing back-driving of powered subsystems. This enables safe insertion/removal in live-backplane systems, provided OE is held HIGH (disabled) during insertion and only asserted after VCC stabilizes.
CBT3251DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74CBT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SSOP
CBT3251DB,118 FAQ
1.How can I place an order for CBT3251DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for CBT3251DB,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 CBT3251DB,118 reliable?
The price and inventory of CBT3251DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CBT3251DB,118 is usually 5 days.
3.What payment methods are accepted for CBT3251DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CBT3251DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CBT3251DB,118?
CBT3251DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CBT3251DB,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 CBT3251DB,118?
For technical support, including CBT3251DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CBT3251DB,118 requirements.
6.How does Aetrix verify that CBT3251DB,118 is sourced from the original manufacturer or authorized distributors?
All CBT3251DB,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 CBT3251DB,118 meets industry standards.
7.What is the process for return or replacement of CBT3251DB,118?
All CBT3251DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with CBT3251DB,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 CBT3251DB,118 part is unused and in its original packaging.
Return procedure for CBT3251DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CBT3251DB,118 Tags
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SN74HC138DR
Texas Instruments
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TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
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74CBTLV3257PW,118
Nexperia USA Inc.
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SN74CBTLV3257PWR
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74CBTLV3257GUX
Nexperia USA Inc.
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74HC154BQ,118
Nexperia USA Inc.
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P3S0200GMX
NXP USA Inc.
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SN74CB3Q3245PWR
Texas Instruments
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SN74CB3Q3257RGYR
Texas Instruments
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TCA9543APWR
Texas Instruments
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TCA9546APWR
Texas Instruments
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SN74HC138N
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