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NXP Semiconductors 74HCT4851BQ,115
- Part No.:
- 74HCT4851BQ,115
- Manufacturer:
- NXP Semiconductors
- Package:
- -
- Datasheet:
-
74HCT4851BQ,115.pdf
- Description:
- NEXPERIA 74HCT4851BQ - SINGLE-EN
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Product details
Overview
74HCT4851BQ,115 from NXP Semiconductors is an 8-channel analog multiplexer/demultiplexer with injection-current effect control, designed for automotive and industrial signal routing. It features active-LOW enable (E), three binary select inputs (S0–S2), eight independent I/Os (Y0–Y7), and one common I/O (Z), operating across 4.5 V to 5.5 V supply with ON-resistance as low as 76 Ω at 4.5 V and injection-current coupling ≤0.27 mV at 5 V/1 mA.
For engineers reviewing the 74HCT4851BQ,115 datasheet, 74HCT4851BQ,115 pinout, 74HCT4851BQ,115 application, or 74HCT4851BQ,115 equivalent, this device is selected for high-reliability analog switching in voltage-overstress environments-especially where disabled channel signals may exceed VCC without corrupting the enabled path.
Technical Context
The 74HCT4851BQ,115 implements a 1-of-8 decoder driving eight independently controlled analog switches, each with integrated injection-current control circuitry that suppresses cross-talk when disabled channels are overdriven. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) ensure robust interfacing with legacy microcontrollers and logic families.
Switch operation is strictly conditional on E being LOW; all channels enter high-impedance OFF-state when E is HIGH, regardless of S0–S2 state. The DHVQFN16 package enables thermal-enhanced performance with 0.85 mm profile and exposed die pad for improved power dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5 V TTL systems and stable operation under automotive battery variation. |
| ON-Resistance (RON) | 76 Ω typical at VCC = 4.5 V - Minimizes signal attenuation and distortion in precision analog paths. |
| Injection Current Coupling | ≤0.27 mV at VCC = 5.0 V, ISW = 1 mA - Prevents signal corruption when disabled analog inputs exceed supply rails. |
| Enable Propagation Delay | 80 ns max at VCC = 4.5 V - Supports fast channel switching in real-time sensor multiplexing. |
| OFF-State Leakage | ±0.1 µA per channel at VCC = 5.5 V - Reduces crosstalk and power loss in high-impedance sensor networks. |
| Input Capacitance | 10 pF max on S0/S1/S2/E - Limits loading on driving logic and preserves signal integrity at high frequencies. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood automotive and industrial control environments. |
Pinout & Package
DHVQFN16 package: 2.5 × 3.5 × 0.85 mm body, no leads, 16 terminals, thermal-enhanced construction with exposed die pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Y4) | Independent analog I/O | One of eight bidirectional signal paths routed to Z when selected. |
| 2 (Y6) | Independent analog I/O | Channel-specific path with matched RON and leakage for consistent channel performance. |
| 3 (Z) | Common analog I/O | Shared connection point; carries signal to/from enabled Yn channel during MUX/DEMUX operation. |
| 4 (Y7) | Independent analog I/O | Full-swing analog-capable terminal; supports rail-to-rail signal handling within VCC range. |
| 5 (Y5) | Independent analog I/O | Electrically isolated when disabled; injection-current control prevents interference from overvoltage events. |
| 6 (E) | Active-LOW enable input | Global switch control: LOW enables channel selection; HIGH forces all switches into high-Z OFF-state. |
| 7 (n.c.) | Not connected | No internal bond; must remain unconnected to avoid parasitic coupling or mechanical stress. |
| 8 (GND) | Ground reference | Primary return path for analog and digital currents; requires low-impedance PCB plane connection. |
| 9 (S2) | Binary select input | MSB of 3-bit address; determines channel group (Y4–Y7 vs Y0–Y3) when E is active. |
| 10 (S1) | Binary select input | Middle bit of channel address; used with S0/S2 to uniquely select one of eight paths. |
| 11 (S0) | Binary select input | LSB of channel address; final bit resolving exact Yn–Z connection under E = LOW. |
| 12 (Y3) | Independent analog I/O | Low-numbered channel optimized for minimal trace length in layout-sensitive applications. |
| 13 (Y0) | Independent analog I/O | Default channel (S2:S1:S0 = 000); often used for calibration or reference signal routing. |
| 14 (Y1) | Independent analog I/O | Second channel in sequence; exhibits identical RON and leakage specs as Y0–Y7. |
| 15 (Y2) | Independent analog I/O | Third channel; shares same injection-current suppression behavior across full temperature range. |
| 16 (VCC) | Positive supply | Power rail for analog switch bias and logic interface; requires local 100 nF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Injection-current cross coupling | < 1 mV/mA - Enables direct connection of sensors with transient overvoltage (e.g., automotive load dump) without external clamping diodes. |
| TTL-compatible input thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees interoperability with 5 V microcontrollers, FPGAs, and legacy logic without level-shifting. |
| Low ON-state resistance mismatch | ΔRON ≤ 8 Ω max at VCC = 4.5 V - Ensures uniform gain and phase response across all eight channels in precision instrumentation. |
| ESD protection | HBM > 2000 V, CDM > 1000 V - Supports safe handling and assembly in standard manufacturing environments without special ESD controls. |
| Latch-up immunity | > 100 mA per JESD78 Class II - Withstands transient current faults in motor drive feedback or industrial I/O modules. |
Applications
| Automotive Sensor Multiplexing | Industrial Analog Data Acquisition |
|---|---|
|
Use Scenario: Routing multiple engine temperature, pressure, and oxygen sensor signals to a single ADC input in ECUs. IC Role / Device Role / Timing Role: Analog multiplexer enabling time-division sampling of up to eight sensors using shared ADC resources. Use Value: Eliminates need for external overvoltage protection diodes when sensors experience battery transients up to VCC + 0.5 V. |
Use Scenario: Consolidating thermocouple, RTD, and strain gauge outputs into a programmable logic controller's analog input module. IC Role / Device Role / Timing Role: Precision analog switch providing low-RON, low-leakage signal path selection under microcontroller control. Use Value: ΔRON ≤ 8 Ω ensures channel-to-channel gain matching within 0.1% for calibrated measurement systems. |
| Medical Instrument Signal Gating | Test Equipment Channel Switching |
|
Use Scenario: Isolating patient-connected biopotential electrodes (ECG/EEG) during calibration or fault detection sequences. IC Role / Device Role / Timing Role: Safety-critical analog gate with guaranteed high-Z OFF-state and sub-µA leakage at 125 °C. Use Value: OFF-state leakage ≤ ±0.1 µA per channel meets IEC 60601-1 creepage/isolation requirements for Class I equipment. |
Use Scenario: Automating signal path configuration in benchtop multimeters and automated test equipment (ATE) front-ends. IC Role / Device Role / Timing Role: High-speed analog MUX supporting <80 ns enable/disable transitions for rapid test sequence execution. Use Value: 80 ns enable time allows >10 MHz channel switching rate in synchronized multi-point measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT4851PW,118 | TSSOP16 package (4.4 mm width, 1 mm height); higher thermal resistance (5.5 mW/K derating above 60 °C). | Better suited for prototyping and manual soldering; less optimal for high-density or thermally constrained PCBs. | Select when board space permits larger footprint and hand-assembly is required. |
| 74HCT4851D,653 | SO16 package (3.9 mm width, 1.75 mm height); higher RON (≈85 Ω at 4.5 V) and lower ESD rating (HBM > 1500 V). | Preferred for legacy designs with existing SOIC footprints and moderate thermal loads. | Choose when reusing SOIC layout or prioritizing cost over thermal performance. |
Compared with 74HCT4851PW,118 and 74HCT4851D,653, the 74HCT4851BQ,115 delivers superior thermal efficiency and lower ON-resistance in the smallest footprint, making it optimal for space-constrained automotive and portable test equipment where signal fidelity and reliability under overvoltage stress are critical.
Availability
74HCT4851BQ,115 is available at Aetrix Electronics and suitable for automotive sensor systems, industrial data acquisition modules, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT4851BQ,115 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with core expertise in high-reliability mixed-signal ICs.
The 74HCT4851BQ,115 belongs to NXP's HC/HCT logic family, engineered specifically for robust analog signal routing in harsh environments where voltage transients, wide temperature swings, and long-term reliability are design-critical.
FAQ
What is the maximum allowable voltage on Yn or Z pins when the switch is disabled?
The 74HCT4851BQ,115 allows switch voltages (VSW) from −0.5 V to VCC + 0.5 V under clamping current limits (±20 mA). This means Yn or Z can safely handle signals up to 6.0 V when VCC = 5.5 V, provided injected current stays within spec - a key enabler for automotive sensor interfaces subject to load-dump transients. The injection-current control circuitry prevents corruption of the enabled channel's signal.
Does the 74HCT4851BQ,115 support rail-to-rail analog signal switching?
Yes, the 74HCT4851BQ,115 supports rail-to-rail analog signal switching within the 0 V to VCC range. Its switch architecture maintains low distortion and consistent RON across the full input voltage span, verified by static characteristics tables showing VI and VSW rated from 0 V to VCC. Signals at GND or VCC are passed without clipping when the channel is enabled and E is LOW.
How does the injection-current effect control in the 74HCT4851BQ,115 improve system-level reliability?
The injection-current effect control in the 74HCT4851BQ,115 limits output voltage variation (ΔVO) to ≤0.27 mV when 1 mA is injected into a disabled channel at VCC = 5.0 V. This eliminates the need for external diode/resistor networks traditionally used to clamp overvoltage on unused analog inputs - reducing BOM count, PCB area, and failure points in automotive and industrial systems exposed to electrical transients.
Can the 74HCT4851BQ,115 be used with 3.3 V logic controllers?
No - the 74HCT4851BQ,115 is TTL-compatible and specified only for VCC = 4.5 V to 5.5 V. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) are optimized for 5 V systems. Driving S0/S1/S2/E from a 3.3 V microcontroller risks unreliable HIGH detection; a level shifter or logic buffer is required for interoperability. For native 3.3 V operation, consider the 74HC4851BQ variant instead.
What is the thermal performance advantage of the DHVQFN16 package in the 74HCT4851BQ,115?
The DHVQFN16 package of the 74HCT4851BQ,115 features a thermal-enhanced construction with 4.5 mW/K power derating above 60 °C - significantly better than SO16 (8 mW/K above 70 °C) or TSSOP16 (5.5 mW/K above 60 °C). This allows higher continuous power dissipation in compact, thermally dense layouts such as engine control units or portable test gear, extending operational margin in +125 °C ambient conditions.
74HCT4851BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Packaging:
- Bulk
- 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:
- -
74HCT4851BQ,115 FAQ
1.How can I place an order for 74HCT4851BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT4851BQ,115 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 74HCT4851BQ,115 reliable?
The price and inventory of 74HCT4851BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT4851BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT4851BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT4851BQ,115 transactions.
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4.How is shipping managed for 74HCT4851BQ,115?
74HCT4851BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT4851BQ,115 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 74HCT4851BQ,115?
For technical support, including 74HCT4851BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT4851BQ,115 requirements.
6.How does Aetrix verify that 74HCT4851BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT4851BQ,115 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 74HCT4851BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT4851BQ,115?
All 74HCT4851BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT4851BQ,115, 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 74HCT4851BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT4851BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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