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onsemi 74VHCT14AM
- Part No.:
- 74VHCT14AM
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74VHCT14AM.pdf
- Description:
- IC INVERT SCHMITT 6CH 1IN 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
74VHCT14AM from ON Semiconductor is a hex Schmitt-trigger inverter IC designed for signal conditioning in mixed-voltage digital systems. It provides six independent hysteresis inverters with 5.0 ns typical propagation delay at 5 V, ±8 mA output drive, and 2 µA max quiescent ICC - enabling clean edge regeneration of slow or noisy input signals in industrial control interfaces.
For engineers reviewing the 74VHCT14AM datasheet, pinout, applications, or equivalent options, key selection criteria include its 0.4–1.5 V hysteresis window, 3V-to-5V interface capability, power-down protection on all I/O, and SOIC-14 package compatibility with legacy 74HCT14 designs.
Technical Context
The 74VHCT14AM implements six independent CMOS Schmitt-trigger inverters using silicon-gate technology, each with asymmetric input thresholds (VP = 1.9–2.1 V, VN = 0.5–0.6 V) to ensure noise immunity against slow-rising/falling waveforms. Its inputs tolerate –0.5 V to +7.0 V regardless of VCC state, supporting hot-swap and battery-backup scenarios.
Output stages are rated for ±25 mA DC current with VOL ≤ 0.44 V at 8 mA sink and VOH ≥ 3.80 V at 8 mA source under 4.5–5.5 V supply. Internal protection diodes and power-down leakage control (IOFF ≤ 5.0 µA) enable safe operation during partial power-down or voltage mismatch conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 5.0 ns typical at 5 V, CL = 15 pF - enables timing-critical signal reshaping in sub-100 MHz clock domains |
| Hysteresis Voltage | 0.4–1.5 V - rejects up to ~1.0 V of low-frequency noise without oscillation on marginal inputs |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable logic-level translation between 3.3 V and 5 V systems |
| Output Drive | ±8 mA at VCC = 4.5–5.5 V - directly drives standard TTL loads or multiple 74-series inputs |
| Quiescent ICC | 2 µA max at TA = 25°C - supports ultra-low-power standby in battery-backed monitoring circuits |
| Supply Range | 4.5–5.5 V - compatible with regulated 5 V rails and tolerant of line ripple up to ±0.5 V |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature environments without derating |
Pinout & Package
74VHCT14AM is housed in a 14-lead SOIC (JEDEC MS-012, 0.150" narrow body), with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot; the package is lead-free per JEDEC J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Inverter Input (A1–A6) | CMOS Schmitt-trigger inputs with hysteresis; accept 0–5.5 V regardless of VCC state |
| 2, 4, 6, 8, 10, 12 | Inverter Output (Y1–Y6) | Push-pull CMOS outputs; support ±25 mA DC, with power-down leakage < 5 µA when VCC = 0 V |
| 7 | GND | Ground reference for all logic and I/O; must be connected before applying inputs or VCC |
| 14 | VCC | Positive supply (4.5–5.5 V); powers internal circuitry and defines output HIGH level |
Key Features
| Feature | Design Value |
|---|---|
| High noise immunity | VIH = 2.0 V / VIL = 0.8 V thresholds provide >1.2 V noise margin against EMI in motor-control feedback paths |
| Power-down protection | Inputs/outputs remain high-impedance and non-destructive when VCC = 0 V - essential for hot-plug I/O expansion |
| 3V-to-5V interface capability | Accepts 3.3 V logic inputs while sourcing 5 V-compatible outputs - eliminates level-shifter components in mixed-supply boards |
| Low dynamic noise | VOLP ≤ 1.0 V (CL = 50 pF) - minimizes ground bounce and crosstalk in dense PCB layouts |
| PIN- and function-compatible | Drop-in replacement for 74HCT14 in SOIC-14 footprint - no PCB redesign required for upgrade path |
Applications
| Industrial Sensor Interface | Microcontroller Reset Conditioning |
|---|---|
|
Use Scenario: Converting slow, noisy analog comparator outputs (e.g., from temperature or pressure sensors) into clean digital signals for PLC input modules. IC Role / Device Role / Timing Role: Signal conditioner and edge regenerator - transforms ramped or jittery transitions into monotonic, rail-to-rail logic edges. Use Value: Eliminates external RC filters and debouncing firmware; hysteresis prevents chatter during threshold crossing in electrically noisy factory environments. |
Use Scenario: Debouncing and synchronizing manual reset buttons or power-fail detection signals before feeding to an MCU's reset pin. IC Role / Device Role / Timing Role: Schmitt-trigger buffer - ensures single, glitch-free reset assertion despite mechanical switch bounce or brown-out recovery transients. Use Value: Guarantees >100 µs minimum reset pulse width and suppresses sub-50 ns noise spikes that could cause unintended MCU resets. |
| Legacy System Voltage Translation | Motor Driver Enable Logic |
|
Use Scenario: Interfacing 3.3 V FPGA I/O banks to 5 V legacy peripheral buses (e.g., ISA, parallel port) without level-shifters. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer - accepts 3.3 V inputs while driving 5 V logic thresholds reliably. Use Value: Reduces BOM count and layout area; avoids timing skew introduced by discrete MOSFET translators in high-density control boards. |
Use Scenario: Conditioning PWM or direction signals from microcontrollers before routing to gate drivers in BLDC motor controllers. IC Role / Device Role / Timing Role: Noise-immune signal conditioner - cleans up microcontroller GPIO outputs exposed to high dv/dt switching noise near power stages. Use Value: Prevents false turn-on of power devices due to EMI-induced glitches; hysteresis ensures stable enable/disable states during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schmitt-trigger inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT14DR | Same 6-gate Schmitt inverter function but lower noise immunity (VIH = 2.0 V, VIL = 0.8 V same); tPD = 7 ns typ. at 5 V, CL = 50 pF | No power-down protection; inputs not tolerant of voltages beyond VCC/GND - unsuitable for hot-swap or backup-battery systems | Preferred where cost is primary and system lacks partial-power conditions; requires external clamping if interfacing >5 V sources |
| MC74VHC14DT | Higher speed (tPD = 3.5 ns typ.), wider VCC range (2–5.5 V), but lower output drive (±8 mA same); no guaranteed VIH/VIL over full temp range | Supports 3.3 V-only operation; lacks 5 V tolerance on inputs - incompatible with 5 V legacy bus interfacing | Select when operating at 3.3 V with strict timing budgets; avoid in 5 V mixed-voltage designs requiring robust input overvoltage handling |
Compared with SN74HCT14DR and MC74VHC14DT, the 74VHCT14AM uniquely combines 5 V system compatibility, input overvoltage tolerance, power-down safety, and industrial temperature rating - making it the only choice for retrofitting legacy 5 V equipment with enhanced noise resilience and hot-swap readiness.
Availability
74VHCT14AM is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset conditioning, legacy system voltage translation, and motor driver enable logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT14AM 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The 74VHCT14AM belongs to ON Semiconductor's legacy logic portfolio, originally developed by Fairchild and optimized for robust, mixed-voltage digital interfacing in harsh industrial environments - emphasizing reliability, noise immunity, and seamless integration with older 5 V systems.
FAQ
What is the maximum input voltage the 74VHCT14AM can tolerate when VCC = 0 V?
The 74VHCT14AM allows –0.5 V to +7.0 V on all inputs and outputs even when VCC = 0 V, thanks to integrated input/output protection diodes and power-down isolation. This enables safe connection to live 5 V buses during board insertion or battery-backup transitions without damaging the device. The 74VHCT14AM maintains this tolerance across its full operating temperature range.
Does the 74VHCT14AM require external pull-up or pull-down resistors on unused inputs?
No - unused inputs on the 74VHCT14AM must be tied HIGH or LOW per datasheet guidance (Note 4), but external resistors are not mandatory if driven by another logic stage. However, floating inputs are strictly prohibited as they may cause excessive ICC, oscillation, or increased EMI susceptibility. The 74VHCT14AM does not include internal termination.
Can the 74VHCT14AM drive a 50 pF capacitive load with guaranteed timing?
Yes - the 74VHCT14AM specifies tPLH/tPHL = 6.5–9.6 ns (max) at VCC = 5.0 V and CL = 50 pF, fully characterized across temperature and voltage. Its ±8 mA output drive ensures stable edge rates into such loads without waveform degradation. This makes the 74VHCT14AM suitable for driving moderate-length PCB traces or multiple downstream logic inputs.
Is the 74VHCT14AM pin-compatible with the original Fairchild 74VHCT14AM?
Yes - the 74VHCT14AM retains identical pinout, electrical behavior, and SOIC-14 package dimensions as the original Fairchild part. ON Semiconductor maintained full functional and mechanical equivalence post-acquisition, including identical absolute maximum ratings, DC/AC specs, and thermal characteristics. No layout changes are needed when replacing Fairchild-sourced 74VHCT14AM units.
What is the hysteresis voltage range of the 74VHCT14AM over temperature and supply voltage?
The 74VHCT14AM delivers VH = 0.4–1.5 V across VCC = 4.5–5.5 V and TA = –40°C to +85°C, with VP ranging from 1.9–2.1 V and VN from 0.5–0.6 V. This hysteresis window remains stable under varying load and supply conditions, ensuring consistent noise rejection in real-world industrial settings where ambient temperature and rail stability fluctuate.
74VHCT14AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Inverter
- Number of Circuits:
- 6
- Number of Inputs:
- 1
- Features:
- Schmitt Trigger
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 8mA, 8mA
- Input Logic Level - Low:
- 0.5V ~ 0.6V
- Input Logic Level - High:
- 1.9V ~ 2.1V
- Max Propagation Delay @ V, Max CL:
- 9.6ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
74VHCT14AM FAQ
1.How can I place an order for 74VHCT14AM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT14AM 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 74VHCT14AM reliable?
The price and inventory of 74VHCT14AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT14AM is usually 5 days.
3.What payment methods are accepted for 74VHCT14AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT14AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT14AM?
74VHCT14AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT14AM 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 74VHCT14AM?
For technical support, including 74VHCT14AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT14AM requirements.
6.How does Aetrix verify that 74VHCT14AM is sourced from the original manufacturer or authorized distributors?
All 74VHCT14AM 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 74VHCT14AM meets industry standards.
7.What is the process for return or replacement of 74VHCT14AM?
All 74VHCT14AM units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT14AM, 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 74VHCT14AM part is unused and in its original packaging.
Return procedure for 74VHCT14AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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