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Texas Instruments SN74CBTLV3251DBQR
- Part No.:
- SN74CBTLV3251DBQR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTLV3251DBQR.pdf
- Description:
- IC MUX/DEMUX 1 X 8:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,685
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Product details
Overview
SN74CBTLV3251DBQR from Texas Instruments is a low-voltage 1-of-8 FET multiplexer/demultiplexer with 5 Ω on-state resistance, rail-to-rail signal switching, and Ioff partial-power-down support. It operates from 2.3 V to 3.6 V, delivers sub-0.25 ns propagation delay at 3.3 V, and is used in high-speed data routing for enterprise computing and wired networking systems.
For engineers reviewing the SN74CBTLV3251DBQR datasheet, SN74CBTLV3251DBQR pinout, SN74CBTLV3251DBQR application, or SN74CBTLV3251DBQR equivalent, key selection criteria include guaranteed 5 Ω ron at 2.5 V/3.3 V, −40 °C to 85 °C industrial temperature range, SSOP-16 package compatibility, and Ioff-enabled isolation during power sequencing.
Technical Context
The SN74CBTLV3251DBQR implements eight bidirectional FET switches controlled by three binary select lines (S0–S2) and an active-low output-enable (OE). Its CMOS-based switch architecture ensures rail-to-rail analog/digital signal pass-through without level translation.
It features true Ioff protection: when VCC = 0 V, leakage remains ≤20 µA across all ports, preventing backdrive current and enabling hot-swap and partial-power-down operation. The device maintains high-impedance state during power-up/down only when OE is pulled up to VCC via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 2.5 V, 64 mA - enables minimal voltage drop and signal attenuation in high-speed data paths |
| Propagation delay (tpd) | 0.15–0.25 ns at VCC = 2.5 V - supports >1 GHz signal routing without timing degradation |
| Supply voltage range | 2.3 V to 3.6 V - compatible with 2.5 V and 3.3 V logic domains and mixed-voltage system interfaces |
| Ioff leakage | ≤20 µA at VCC = 0 V - guarantees safe isolation and prevents bus contention during power sequencing |
| Operating temperature | −40 °C to +85 °C - qualified for industrial-grade embedded and infrastructure applications |
| ESD rating (HBM) | 2000 V - meets JEDEC JS-001 for robust handling in automated assembly and field environments |
| Input capacitance (Ci) | 3 pF - minimizes loading on driving sources and preserves signal integrity in high-frequency buses |
Pinout & Package
SN74CBTLV3251DBQR uses a 16-pin SSOP (DBQ) package measuring 4.90 mm × 3.90 mm with 0.65 mm pitch. Pin 1 is located in quadrant Q1 per tape-and-reel orientation standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | Common I/O port | Bidirectional data path connected to one of eight B-port channels based on S0–S2 address |
| B1–B8 | Channel I/O ports | Eight independent bidirectional switch terminals; only one connects to A at any time |
| S0, S1, S2 | Binary select inputs | 3-bit address determining which B-port is routed to A (L/L/L = B1, H/H/H = B8) |
| OE | Active-low enable | When high, forces all switches into high-impedance state; requires external pullup to VCC |
| VCC | Power supply | Single 2.3–3.6 V supply powering internal logic and switch bias; bypass capacitor required |
| GND | Ground reference | Return path for supply and signal currents; must be low-impedance for noise control |
| NC | No-connect terminal | Pin 6 has no internal connection; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| 5 Ω low on-resistance | Ensures <10 mV drop at 2 mA, preserving signal amplitude in precision analog and high-speed digital routing |
| Rail-to-rail switching | Supports full 0 V to VCC input/output swing without clipping - critical for mixed-signal and legacy interface compatibility |
| Ioff partial-power-down | Blocks damaging back-current flow when VCC is off, enabling safe insertion/removal in live backplanes and modular systems |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II - eliminates risk of destructive latch-up under transient overvoltage or ESD stress |
| Sub-0.25 ns propagation delay | Enables error-free routing of >1 GHz clock/data signals without added jitter or skew in timing-critical paths |
Applications
| Datacenter Interconnect Routing | Industrial Keypad Multiplexing |
|---|---|
Use Scenario: Selecting between eight server management interfaces (e.g., BMC, IPMI, UART) sharing a single debug port on a baseboard management controller. IC Role / Device Role / Timing Role: Bidirectional 1:8 analog/digital switch enabling dynamic channel assignment without level shifters or buffers. Use Value: Reduces connector count and PCB real estate while maintaining signal integrity up to 500 MHz due to 5 Ω ron and low Ci. |
Use Scenario: Scanning an 8×8 keypad matrix using only 11 MCU GPIOs (3 select + 1 OE + 7 B-lines), minimizing firmware overhead and power consumption. IC Role / Device Role / Timing Role: Low-leakage, rail-to-rail analog switch isolating unused rows/columns during polling cycles. Use Value: Eliminates need for external pullups and enables simultaneous key detection with <1 µA standby current via Ioff mode. |
| Wired Networking PHY Interface | Building Automation Sensor Hub |
Use Scenario: Sharing a single Ethernet PHY's MDIO/MDC bus among eight transceivers in a multi-port switch ASIC design. IC Role / Device Role / Timing Role: High-speed, low-capacitance switch ensuring compliant MDIO timing (tpd < 0.25 ns) across all channels. Use Value: Avoids timing violations and bus contention while supporting hot-plug detection through isolated channel enable/disable. |
Use Scenario: Aggregating analog outputs from eight temperature/humidity sensors onto a single ADC input in HVAC control panels. IC Role / Device Role / Timing Role: Precision analog multiplexer with matched ron and low crosstalk (<−60 dB) for accurate sensor readings. Use Value: Enables 12-bit ADC accuracy without calibration drift, as 5 Ω ron variation is <0.01% of typical 10 kΩ sensor impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3251DBQR | Higher ron (15 Ω typ at 5 V), 4.5–5.5 V supply only - no Ioff support | Not suitable for partial-power-down or mixed-voltage systems; limited to 5 V-only legacy designs | Choose only if operating strictly at 5 V and Ioff is unnecessary |
| TS3A27518ERTER | 8-channel, 3.3 V max, 0.7 Ω ron, but lacks OE pin and supports only unidirectional routing | Requires redesign of control logic; unsuitable for bidirectional bus sharing or hot-swap isolation | Select only for ultra-low-loss unidirectional signal routing where OE control and Ioff are not required |
Compared with SN74CBTLV3251DBQR, SN74CBT3251DBQR trades lower cost for higher ron and no power-down safety, while TS3A27518ERTER offers lower resistance but sacrifices bidirectionality and OE-controlled isolation - making SN74CBTLV3251DBQR the only option meeting all three requirements simultaneously.
Availability
SN74CBTLV3251DBQR is available at Aetrix Electronics and suitable for datacenter interconnect routing, industrial keypad multiplexing, and wired networking PHY interface applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74CBTLV3251DBQR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with decades of expertise in high-speed logic and interface ICs.
The SN74CBTLV3251DBQR belongs to TI's CBTLV low-voltage FET switch family, designed specifically for high-bandwidth, low-distortion signal routing in enterprise infrastructure and industrial control systems.
FAQ
What is the maximum operating frequency supported by SN74CBTLV3251DBQR?
The SN74CBTLV3251DBQR does not specify a hard maximum frequency limit, but its 0.15–0.25 ns propagation delay and 5 Ω ron support clean signal routing up to 1 GHz in well-designed PCB layouts. System-level bandwidth depends on trace impedance, load capacitance, and driver strength - the device itself introduces negligible phase shift or attenuation below 500 MHz.
Does SN74CBTLV3251DBQR require external pull-up resistors on control pins?
Yes - SN74CBTLV3251DBQR requires an external pull-up resistor on the OE pin to ensure high-impedance state during power-up and power-down. The minimum value depends on the driver's sink capability; TI recommends calculating based on VCC/IOL. S0–S1–S2 inputs must also be actively driven to VCC or GND - floating states are not permitted.
Can SN74CBTLV3251DBQR be used with 1.8 V logic signals?
No - SN74CBTLV3251DBQR is not rated for 1.8 V operation. Its recommended supply range is 2.3 V to 3.6 V, and VIH/VIL thresholds scale with VCC. At VCC = 2.3 V, VIH(min) = 1.7 V, making 1.8 V inputs marginal and unreliable. For 1.8 V systems, consider TI's SN74AVC series or similar 1.65–3.6 V switches.
Is SN74CBTLV3251DBQR pin-compatible with other packages in the same family?
Yes - SN74CBTLV3251DBQR shares identical pinout and function mapping with SN74CBTLV3251PWR (TSSOP), SN74CBTLV3251DGVR (TVSOP), and SN74CBTLV3251RGYR (VQFN). All variants use the same 16-pin arrangement, signal naming, and electrical behavior - only package dimensions and thermal characteristics differ.
How does the Ioff feature protect the SN74CBTLV3251DBQR during power-down?
The Ioff feature ensures that when VCC = 0 V, leakage current across any switch path remains ≤20 µA even if B-port or A-port voltages range from 0 V to 3.6 V. This prevents damaging back-current flow into powered-down sections of the system, enabling safe hot-swap operation and eliminating the need for external blocking diodes or isolation circuitry in SN74CBTLV3251DBQR-based designs.
SN74CBTLV3251DBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 16-SSOP (0.154", 3.90mm 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-SSOP
SN74CBTLV3251DBQR FAQ
1.How can I place an order for SN74CBTLV3251DBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3251DBQR 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 SN74CBTLV3251DBQR reliable?
The price and inventory of SN74CBTLV3251DBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3251DBQR is usually 5 days.
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SN74CBTLV3251DBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3251DBQR 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 SN74CBTLV3251DBQR?
For technical support, including SN74CBTLV3251DBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3251DBQR requirements.
6.How does Aetrix verify that SN74CBTLV3251DBQR is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3251DBQR 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 SN74CBTLV3251DBQR meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3251DBQR?
All SN74CBTLV3251DBQR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3251DBQR, 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 SN74CBTLV3251DBQR part is unused and in its original packaging.
Return procedure for SN74CBTLV3251DBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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