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Renesas 74CBTLV3251PGG8
- Part No.:
- 74CBTLV3251PGG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74CBTLV3251PGG8.pdf
- Description:
- IC MUX/DEMUX 1 X 8:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,464
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Product details
Overview
74CBTLV3251PGG8 from Renesas Electronics is a low-voltage 8:1 bi-directional multiplexer/demultiplexer IC with 5Ω on-state resistance, 2.3V–3.6V supply range, and industrial temperature operation (−40°C to +85°C), used for high-speed signal routing in FPGA I/O expansion and memory interface bus switching.
For engineers reviewing the 74CBTLV3251PGG8 datasheet, 74CBTLV3251PGG8 pinout, 74CBTLV3251PGG8 application, or 74CBTLV3251PGG8 equivalent, key selection criteria include guaranteed 5Ω RON, power-off isolation, over-voltage tolerance up to 4.6V, sub-0.25ns propagation delay, and TSSOP-16 package compatibility with dense PCB layouts.
Technical Context
The 74CBTLV3251PGG8 implements an 8:1 analog switch architecture using NMOS pass transistors with integrated level-shifting control circuitry, enabling bidirectional signal flow between A and any of eight B ports (B1–B8) under S0/S1/S2 address decoding. OE enables/disables all switches simultaneously.
It operates without internal latching or clocking-functionality is purely combinational-supporting true analog signal pass-through with minimal distortion. Power-off isolation ensures <50µA off-state leakage when VCC = 0V, and over-voltage tolerance allows B-port signals up to 4.6V even when unpowered.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - supports dual-rail systems with 2.5V or 3.3V logic domains |
| RON (Typ) | 5Ω at VCC = 2.5V, IO = 64mA - enables low-loss signal routing for DDR/PCIe reference clocks |
| tPD Max | 0.25ns - preserves signal integrity in >1GHz digital interfaces |
| Off-State Leakage | <50µA at VCC = 0V - prevents back-powering of powered-down subsystems |
| Over-Voltage Tolerance | −0.5V to +4.6V on I/O pins - allows safe interfacing with mixed-voltage peripherals |
| ESD Rating | >2000V HBM, >200V MM - meets industrial handling requirements without external protection |
Pinout & Package
TSSOP-16 package (PGG16), 4.4mm × 5.0mm body, 0.65mm pitch, exposed pad not present, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | Primary return path for all switch and control currents; must be low-impedance |
| 2 (B1) | Data Input/Output Port | One of eight bidirectional channel terminals; connects to A when S2:S1:S0 = 000 |
| 3 (B2) | Data Input/Output Port | Second channel terminal; connects to A when S2:S1:S0 = 001 |
| 4 (B3) | Data Input/Output Port | Third channel terminal; connects to A when S2:S1:S0 = 010 |
| 5 (B4) | Data Input/Output Port | Fourth channel terminal; connects to A when S2:S1:S0 = 011 |
| 6 (B5) | Data Input/Output Port | Fifth channel terminal; connects to A when S2:S1:S0 = 100 |
| 7 (B6) | Data Input/Output Port | Sixth channel terminal; connects to A when S2:S1:S0 = 101 |
| 8 (B7) | Data Input/Output Port | Seventh channel terminal; connects to A when S2:S1:S0 = 110 |
| 9 (B8) | Data Input/Output Port | Eighth channel terminal; connects to A when S2:S1:S0 = 111 |
| 10 (OE) | Output Enable | Active-low global enable; high state forces all switches into high-Z |
| 11 (S0) | Select Bit 0 | LSB of 3-bit address; determines which B port connects to A |
| 12 (S1) | Select Bit 1 | Mid-bit of 3-bit address; decoded with S0 and S2 |
| 13 (S2) | Select Bit 2 | MSB of 3-bit address; completes 8-channel selection |
| 14 (A) | Common I/O Terminal | Bidirectional data hub; routes to selected B port when OE = low |
| 15 (VCC) | Supply Voltage | Power rail for internal logic and switch bias; decoupling required within 1cm |
| 16 (NC) | No Connect | Internally unused; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional 5Ω Switch | Enables lossless analog/digital signal routing in both directions without direction control logic |
| Power-Off Isolation | Maintains <50µA leakage when VCC = 0V, preventing unintended current paths in partial-power-down systems |
| Over-Voltage Tolerance | Accepts −0.5V to +4.6V on all I/O pins regardless of VCC state, simplifying mixed-voltage board design |
| Industrial Temp Range | Guaranteed operation from −40°C to +85°C ambient, supporting deployment in factory automation and outdoor edge nodes |
| Low Propagation Delay | 0.25ns max tPD ensures timing-critical applications like clock distribution retain phase alignment |
Applications
| PCIe Lane Multiplexing | FPGA I/O Expansion |
|---|---|
Use Scenario: Dynamically reassigning PCIe Gen3 lanes between CPU and multiple accelerators in server mezzanine cards. IC Role / Device Role / Timing Role: 74CBTLV3251PGG8 acts as a passive lane selector, routing differential pairs without retiming or buffering. Use Value: Enables hardware-reconfigurable topology with no added jitter or skew due to its sub-0.25ns tPD and matched RON. | Use Scenario: Expanding limited FPGA GPIO count by sharing a single high-speed I/O bank across eight peripheral sensors. IC Role / Device Role / Timing Role: 74CBTLV3251PGG8 serves as a bi-directional analog mux, allowing time-division access to SPI/I²C buses. Use Value: Eliminates need for additional level shifters or buffers thanks to 4.6V over-voltage tolerance on sensor-side B ports. |
| DDR Memory Bus Sharing | Industrial CAN Transceiver Selection |
Use Scenario: Sharing a single DDR3/DDR4 memory controller between two independent processor modules in redundant control systems. IC Role / Device Role / Timing Role: 74CBTLV3251PGG8 functions as a low-RON bus switch, connecting DQ/DQS lines only during active access cycles. Use Value: Maintains signal integrity with 5Ω RON and 40.5pF A-port capacitance, minimizing reflections on 800MHz+ memory buses. | Use Scenario: Selecting between multiple isolated CAN FD transceivers in modular PLC backplanes with shared microcontroller UART. IC Role / Device Role / Timing Role: 74CBTLV3251PGG8 provides voltage-tolerant signal routing between MCU TX/RX and one of eight CAN PHYs. Use Value: Supports hot-swap-safe operation via power-off isolation, preventing bus contention when transceivers are powered down independently. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8:1 analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3251PWR | Higher RON (7Ω typ), wider VCC range (4.5V–5.5V), no over-voltage tolerance beyond VCC | Requires 5V supply; unsuitable for 3.3V-only or mixed-voltage systems | Choose only if legacy 5V infrastructure mandates compatibility and over-voltage tolerance is unnecessary |
| PI3CH485LE | Lower RON (3.5Ω typ), supports 1.8V–5.5V, but lacks power-off isolation specification | No guaranteed off-state leakage limit at VCC = 0V; risk of back-powering in partial-power-down designs | Prefer when lowest possible RON is critical and full system power sequencing is controlled |
Compared with SN74CBT3251PWR and PI3CH485LE, the 74CBTLV3251PGG8 uniquely balances low RON, industrial temperature support, power-off isolation, and over-voltage tolerance-making it optimal for mixed-voltage, hot-swap-capable embedded systems where reliability under partial power loss is mandatory.
Availability
74CBTLV3251PGG8 is available at Aetrix Electronics and suitable for PCIe lane routing, FPGA I/O expansion, DDR memory bus sharing, and industrial CAN transceiver selection requiring stable component supply across extended temperature ranges.
Supply support for 74CBTLV3251PGG8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, SoCs, and analog/power devices for automotive, industrial, and infrastructure markets.
The CBTLV family was designed specifically for high-speed, low-voltage signal switching in memory, bus, and interconnect applications-prioritizing minimal RON, ultra-low propagation delay, and robust power sequencing behavior.
FAQ
What is the maximum operating voltage on the B-port pins of the 74CBTLV3251PGG8?
The 74CBTLV3251PGG8 supports −0.5V to +4.6V on all B-port pins regardless of VCC state. This over-voltage tolerance allows safe interfacing with peripherals operating at higher voltages than the 2.3V–3.6V supply rail, eliminating the need for external level-shifting components in mixed-voltage designs.
Does the 74CBTLV3251PGG8 require external pull-up resistors on the OE pin?
Yes-the 74CBTLV3251PGG8 datasheet recommends tying OE to VCC through a pull-up resistor during power-up/down to ensure high-impedance state. The minimum resistor value depends on the driver's current-sinking capability, but typical values range from 4.7kΩ to 10kΩ for standard CMOS drivers.
Can the 74CBTLV3251PGG8 be used in bidirectional analog signal paths?
Yes-the 74CBTLV3251PGG8 is a fully bidirectional analog switch with symmetrical RON and capacitance characteristics. Signals can flow from A to any B port or from any B port to A without polarity restrictions, making it suitable for audio, clock, and data bus applications requiring transparent signal pass-through.
What is the typical on-state resistance of the 74CBTLV3251PGG8 at 3.3V supply?
At VCC = 3.3V and IO = 24mA, the 74CBTLV3251PGG8 exhibits a typical on-state resistance of 5Ω. This value is confirmed across the full industrial temperature range and contributes directly to low insertion loss in high-speed digital and analog signal routing applications.
Is the 74CBTLV3251PGG8 pin-compatible with the QS3251 family?
Yes-the 74CBTLV3251PGG8 is functionally equivalent to the QS3251 and shares identical pinout, electrical specifications, and functional behavior. It is a drop-in replacement for QS3251 in TSSOP-16 packages, maintaining full compatibility with existing PCB layouts and firmware control logic.
74CBTLV3251PGG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74CBTLV
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74CBTLV3251PGG8 FAQ
1.How can I place an order for 74CBTLV3251PGG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTLV3251PGG8 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 74CBTLV3251PGG8 reliable?
The price and inventory of 74CBTLV3251PGG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3251PGG8 is usually 5 days.
3.What payment methods are accepted for 74CBTLV3251PGG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3251PGG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74CBTLV3251PGG8?
74CBTLV3251PGG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTLV3251PGG8 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 74CBTLV3251PGG8?
For technical support, including 74CBTLV3251PGG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3251PGG8 requirements.
6.How does Aetrix verify that 74CBTLV3251PGG8 is sourced from the original manufacturer or authorized distributors?
All 74CBTLV3251PGG8 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 74CBTLV3251PGG8 meets industry standards.
7.What is the process for return or replacement of 74CBTLV3251PGG8?
All 74CBTLV3251PGG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3251PGG8, 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 74CBTLV3251PGG8 part is unused and in its original packaging.
Return procedure for 74CBTLV3251PGG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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