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NXP Semiconductors 74HCT4351DB,112
- Part No.:
- 74HCT4351DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- -
- Datasheet:
-
74HCT4351DB,112.pdf
- Description:
- IC MUX/DEMUX 8X1 20SSOP
- Quantity:
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Inventory:774
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Product details
Overview
74HCT4351DB,112 from Nexperia is an 8-channel analog multiplexer/demultiplexer with integrated address latches and dual enable control, operating as a single-pole octal-throw (SP8T) bidirectional analog switch. It supports ±5 V analog signal routing, features 70 Ω typical ON resistance at 4.5 V VCC–VEE, and operates across –40 °C to +125 °C. It is used in precision data acquisition systems where channel selection stability and logic-level translation between 5 V digital control and bipolar analog signals are required.
For engineers reviewing the 74HCT4351DB,112 datasheet, 74HCT4351DB,112 pinout, 74HCT4351DB,112 application, or 74HCT4351DB,112 equivalent, key selection criteria include latch-enabled channel hold timing, rail-to-rail analog voltage range (–5 V to +5 V), guaranteed turn-ON/OFF times under 60 ns at 4.5 V/–4.5 V supplies, and SO20 package compatibility with industrial PCB layouts.
Technical Context
The 74HCT4351DB,112 implements a 3-bit binary decoder driving eight independent analog switches, with separate active-low E1 and active-high E2 enables for hierarchical gating. Its latch enable (LE) input allows transparent or latched operation of S0–S2 select lines, decoupling analog switching from transient digital bus activity.
It uses CMOS-compatible HCT logic inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) and integrates clamp diodes on all digital inputs, enabling safe interfacing to voltages exceeding VCC when current-limiting resistors are applied. The device maintains <0.06% sine-wave distortion at 8 VPP and 1 MHz with ±4.5 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-channel analog MUX/DEMUX with address latches and dual enable (E1/E2) |
| Supply Range | VCC–VEE = 2.0–10.0 V; supports ±4.5 V operation for full –5 V to +5 V analog swing |
| ON Resistance | 70 Ω typical at VCC = 4.5 V, VEE = –4.5 V - ensures minimal signal attenuation in sensor front-ends |
| Propagation Delay | 4 ns typical (Vis→Vos) at VCC = 4.5 V, VEE = –4.5 V - enables high-speed channel switching in DAQ systems |
| Turn-ON Time | 30 ns typical at VCC = 4.5 V, VEE = –4.5 V - critical for time-multiplexed sampling accuracy |
| Isolation (OFF-state) | –50 dB at 1 MHz - prevents crosstalk between unselected channels in multi-sensor arrays |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
74HCT4351DB,112 is housed in a plastic small outline package (SO20), SOT163-1, with 20 leads and 7.5 mm body width. Pin 1 is index-marked; pins 3 and 14 are not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E1 (7) | Enable input (active LOW) | Primary global disable; must be LOW and E2 HIGH for any channel to conduct |
| E2 (8) | Enable input (active HIGH) | Secondary enable; complements E1 for fail-safe or cascaded control |
| LE (11) | Latch enable (active LOW) | When LOW, S0–S2 inputs are latched; when HIGH, latch is transparent |
| S0–S2 (15,13,12) | Select inputs | 3-bit binary address determining which Yn connects to Z (Y0 = 000, Y7 = 111) |
| Y0–Y7 (17,18,19,16,1,6,2,5) | Independent analog I/O terminals | Bidirectional ports; each connects to Z only when selected and both enables active |
| Z (4) | Common analog I/O terminal | Shared path for multiplexed signal routing; supports both MUX (Y→Z) and DEMUX (Z→Y) modes |
| VEE (9) | Negative supply | Required for bipolar operation; sets lower rail of analog voltage range (e.g., –4.5 V) |
| GND (10) | Ground reference | Logic ground; tied to VEE in single-supply configurations (VEE = GND) |
| VCC (20) | Positive supply | Sets upper rail; 4.5–5.5 V nominal for HCT logic compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Wide analog voltage range | –5 V to +5 V signal handling with ±4.5 V supplies - eliminates external level-shifting in mixed-signal systems |
| Integrated address latches | LE-controlled transparent/latched mode prevents spurious channel switching during address bus transitions |
| Logic-level translation | HCT inputs accept 5 V TTL logic while controlling ±5 V analog paths - bridges microcontroller GPIOs to sensor interfaces |
| Break-before-make switching | Guaranteed OFF-state overlap prevents momentary short-circuits during channel changes - critical for relay-replacement applications |
| ESD robustness | HBM >2000 V and CDM >1000 V - withstands handling and board-level transients without protection circuitry |
Applications
| Industrial Data Acquisition | Automotive Sensor Multiplexing |
|---|---|
|
Use Scenario: Simultaneous sampling of 8 thermocouple or RTD inputs using a single ADC channel. IC Role / Device Role / Timing Role: Analog MUX routing sensor outputs to ADC input; latch holds channel selection during conversion cycle. Use Value: Reduces component count vs. discrete switches; 70 Ω RON minimizes gain error in precision ratiometric measurements. |
Use Scenario: Consolidating pressure, temperature, and position sensor signals in engine control units. IC Role / Device Role / Timing Role: DEMUX distributing diagnostic test signals to multiple sensors; E1/E2 enables support fault-isolation sequencing. Use Value: –40 °C to +125 °C rating ensures reliability in under-hood environments; ±4.5 V operation matches sensor excitation rails. |
| Test Equipment Signal Routing | Medical Instrumentation Front-End |
|
Use Scenario: Automated test systems switching calibration references or DUT signals into measurement instruments. IC Role / Device Role / Timing Role: High-speed MUX selecting between 8 calibrated voltage sources; LE synchronizes switching with instrument trigger. Use Value: 4 ns propagation delay and <0.06% distortion preserve signal fidelity for metrology-grade accuracy. |
Use Scenario: Multi-lead ECG or EEG amplifiers selecting electrode pairs for differential measurement. IC Role / Device Role / Timing Role: Low-leakage analog switch isolating unused electrodes; OFF-state leakage <±4.0 μA prevents DC offset drift. Use Value: –50 dB isolation at 1 MHz suppresses interference between adjacent biopotential channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC4351DB,112 | HCMOS logic inputs (VIH = 3.15 V min); wider VCC range (2–10 V); higher RON (100 Ω typ at 4.5 V) | Better suited for battery-powered systems with variable supply; less ideal for strict 5 V TTL control buses | Choose when system uses mixed 3.3 V/5 V logic and requires extended supply flexibility. |
| ADG708BRUZ | CMOS process; 3.5 Ω RON; no latch; SPI interface instead of parallel S0–S2; 32-pin TSSOP | Requires microcontroller firmware control; superior RON and bandwidth but lacks hardware latch for deterministic timing | Choose when lowest ON resistance and software-configurable channel mapping outweigh need for latch-based timing control. |
Compared with 74HC4351DB,112 and ADG708BRUZ, the 74HCT4351DB,112 uniquely balances TTL-compatible digital control, hardware latching for jitter-free switching, and bipolar analog capability - making it optimal for deterministic, low-firmware-overhead multiplexing in harsh-environment embedded systems.
Availability
74HCT4351DB,112 is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor management, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT4351DB,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 global semiconductor expert delivering high-performance, reliable components for automotive, industrial, and consumer applications, with leadership in logic, power, and analog solutions.
The 74HCT4351DB,112 belongs to Nexperia's 74HCT logic family, engineered for seamless interoperability between 5 V TTL systems and bipolar analog signal chains in space-constrained, high-reliability embedded designs.
FAQ
What is the maximum analog signal voltage range supported by the 74HCT4351DB,112?
The 74HCT4351DB,112 supports analog signals from –5 V to +5 V when operated with VCC = +4.5 V and VEE = –4.5 V. This rail-to-rail capability is enabled by its bipolar supply architecture and internal switch design, allowing direct interfacing with sensors and transducers that output negative-going signals without external level-shifting circuitry.
How does the latch enable (LE) function affect channel selection timing in the 74HCT4351DB,112?
When LE is HIGH, the 74HCT4351DB,112 operates in transparent mode: changes to S0–S2 immediately update the selected channel. When LE is driven LOW, the current S0–S2 state is latched, freezing channel selection regardless of subsequent address bus activity - this prevents glitches during microcontroller bus contention or asynchronous updates, ensuring deterministic analog routing timing.
Can the 74HCT4351DB,112 be used in single-supply configurations, and what are the implications?
Yes, the 74HCT4351DB,112 can operate with VEE = GND (0 V) and VCC = 4.5–5.5 V, supporting 0–5 V analog signals. In this configuration, the analog input range is limited to 0 V to VCC, and ON resistance increases slightly versus bipolar operation. The device remains fully functional for unipolar applications like digital potentiometer replacement or 5 V sensor MUXing.
What is the significance of the dual enable inputs (E1 and E2) on the 74HCT4351DB,112?
E1 (active LOW) and E2 (active HIGH) provide complementary enable logic on the 74HCT4351DB,112, requiring both to be asserted (E1 = LOW, E2 = HIGH) for any channel to conduct. This design enables fail-safe operation - e.g., tying E2 to a system health signal ensures analog paths remain open only when subsystems are verified operational, enhancing safety-critical system integrity.
How does the 74HCT4351DB,112 handle electrostatic discharge (ESD) in real-world PCB environments?
The 74HCT4351DB,112 incorporates on-chip ESD protection rated to >2000 V HBM and >1000 V CDM per JEDEC JS-001/JS-002 standards. Its input clamp diodes allow safe interfacing to overvoltage conditions when series current-limiting resistors are used - reducing or eliminating the need for external TVS devices in cost-sensitive industrial and automotive PCB layouts.
74HCT4351DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- -
- Number of Circuits:
- -
- On-State Resistance (Max):
- -
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- -
- Current - Leakage (IS(off)) (Max):
- -
- Crosstalk:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HCT4351DB,112 FAQ
1.How can I place an order for 74HCT4351DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT4351DB,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 74HCT4351DB,112 reliable?
The price and inventory of 74HCT4351DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT4351DB,112 is usually 5 days.
3.What payment methods are accepted for 74HCT4351DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT4351DB,112 transactions.
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4.How is shipping managed for 74HCT4351DB,112?
74HCT4351DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT4351DB,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 74HCT4351DB,112?
For technical support, including 74HCT4351DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT4351DB,112 requirements.
6.How does Aetrix verify that 74HCT4351DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT4351DB,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 74HCT4351DB,112 meets industry standards.
7.What is the process for return or replacement of 74HCT4351DB,112?
All 74HCT4351DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT4351DB,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 74HCT4351DB,112 part is unused and in its original packaging.
Return procedure for 74HCT4351DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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