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Nexperia USA Inc. 74HC21DB,118
- Part No.:
- 74HC21DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
74HC21DB,118.pdf
- Description:
- IC GATE AND
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
74HC21DB,118 from Nexperia is a dual 4-input CMOS AND gate in SSOP14 package, operating from 2.0 V to 6.0 V supply, delivering propagation delays as low as 10 ns at 5.0 V/15 pF, with ±25 mA output drive and guaranteed operation from −40 °C to +125 °C - used for logic-level signal conditioning and combinational control in industrial PLC I/O modules.
For engineers reviewing the 74HC21DB,118 datasheet, 74HC21DB,118 pinout, 74HC21DB,118 application, or 74HC21DB,118 equivalent, this device supports high-noise-immunity digital interfacing, voltage-level translation across mixed-supply systems, and compact board-space logic consolidation where dual independent 4-input AND functions are required.
Technical Context
The 74HC21DB,118 implements two independent 4-input AND gates using standard CMOS silicon technology, with input clamp diodes enabling safe interface to voltages exceeding VCC when current-limiting resistors are used. Each gate exhibits symmetrical HIGH/LOW output voltage thresholds referenced to VCC.
Its static characteristics include VIH = 3.15 V (min) and VIL = 1.35 V (max) at VCC = 4.5 V, and dynamic performance is characterized by tpd = 10 ns (typ) at 5.0 V/15 pF load, with CPD = 15 pF for dynamic power estimation. The device complies with JEDEC JESD7A and JESD8C standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual independent 4-input AND gates - enables parallel Boolean conjunction of four signals per channel |
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V logic families without level shifters |
| Propagation Delay | 10 ns typical at VCC = 5.0 V, CL = 15 pF - ensures timing-critical combinational logic meets sub-25 ns system clock domains |
| Output Drive | ±25 mA per output - sufficient to directly drive LED indicators, small-signal MOSFET gates, or fan-out to ≥10 74HC inputs |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood industrial control and extended-temperature embedded applications |
| Input Clamp Diodes | Integrated on all inputs - allows safe overvoltage tolerance up to VCC + 0.5 V with external current limiting |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - reduces need for external ESD protection in board-level designs |
Pinout & Package
74HC21DB,118 is housed in a 14-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, body width 5.3 mm, and JEDEC MO-153 compliant outline SOT337-1. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B, 1C, 1D | Gate 1 inputs | Four logic inputs for first AND function; all accept CMOS-compatible voltage levels |
| 1Y | Gate 1 output | Active-HIGH AND result; drives loads up to ±25 mA with VOH ≥ 3.98 V at 4.5 V supply |
| 2A, 2B, 2C, 2D | Gate 2 inputs | Four independent logic inputs for second AND function; electrically isolated from Gate 1 |
| 2Y | Gate 2 output | Second independent AND output; identical electrical specs to 1Y |
| VCC (Pin 14) | Positive supply | Primary power rail; must be decoupled locally with 100 nF ceramic capacitor |
| GND (Pin 7) | Ground reference | Return path for all internal currents; requires low-impedance PCB connection |
| n.c. (Pins 3, 11) | No connect | Internally unconnected; must remain floating - no PCB trace or solder mask opening required |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2.0–6.0 V) | Enables single-part support across legacy 5 V and modern 3.3 V systems without redesign |
| Latch-up immunity > 100 mA | Prevents destructive parasitic SCR activation during transient overcurrent events |
| Input transition rate support | Accepts slow edges down to 625 ns/V at 2.0 V - tolerates RC-filtered or debounced switch inputs |
| Low ICC (≤2.0 μA typ at 6 V) | Reduces quiescent power in battery-backed or always-on monitoring circuits |
| CMOS input levels | Ensures clean logic thresholds across full VCC range - eliminates ambiguity in mixed-voltage signal routing |
Applications
| Industrial Sensor Interface | Programmable Logic Controller (PLC) Input Conditioning |
|---|---|
Use Scenario: Aggregating four discrete limit switch or proximity sensor signals before enabling a safety relay output. IC Role / Device Role / Timing Role: Dual 4-input AND gate performing hardware-level interlock validation prior to actuator enable. Use Value: Eliminates need for microcontroller polling or FPGA logic resources; provides deterministic <10 ns response to fault conditions. |
Use Scenario: Validating simultaneous presence of four fieldbus communication status flags before asserting module ready signal. IC Role / Device Role / Timing Role: Combinational logic block ensuring synchronized readiness across redundant CAN/RS-485 channels. Use Value: Enables fail-safe startup sequencing without software boot delay; operates reliably at 125 °C ambient. |
| Power Sequencing Control | Test Equipment Signal Gating |
Use Scenario: Requiring all four DC/DC converter OK signals to be HIGH before releasing the main system reset. IC Role / Device Role / Timing Role: Hardware-enforced power-good arbitration with zero firmware dependency. Use Value: Prevents brown-out crashes during cold start; supports MIL-STD-704F compliant avionics power-up sequences. |
Use Scenario: Enabling analog stimulus delivery only when four calibration lock bits and test mode enable are asserted. IC Role / Device Role / Timing Role: Secure gating element preventing unauthorized or out-of-spec test signal injection. Use Value: Adds tamper-resistant hardware layer to automated test equipment; withstands 2 kV HBM ESD during probe contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-input AND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC21D,118 | SO14 package (3.9 mm width); 10.1 mW/K thermal derating above 100 °C | Better heat dissipation in convection-cooled industrial enclosures; larger footprint | Select when board layout allows SO14 and thermal margin > 15 °C is needed |
| SN74HC21DR | Texas Instruments part in SOIC-14; identical logic but VIH/VIL tighter (±0.1 V), higher ICC (5 μA max) | Suitable for TI-centric BOMs; slightly reduced noise margin at 2.0 V | Choose only if TI qualification or existing TI design reuse is mandatory |
Compared with 74HC21DB,118, the SO14 variant offers superior thermal performance in high-power-density layouts, while the TI alternative trades minor static parameter tightening for ecosystem alignment - neither matches the SSOP14's 30 % board area reduction without sacrificing speed or drive strength.
Availability
74HC21DB,118 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and power management systems requiring stable component supply, long-term lifecycle assurance, and SSOP14 footprint compatibility.
Supply support for 74HC21DB,118 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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC21DB,118 belongs to Nexperia's 74HC high-speed CMOS logic family, engineered for robust, low-power, wide-supply digital interfacing in space-constrained and thermally demanding environments.
FAQ
What is the maximum recommended operating frequency for 74HC21DB,118?
The 74HC21DB,118 does not specify a maximum clock frequency because it is a combinational logic device without internal clocking. Its usable switching rate is determined by propagation delay (10 ns typical at 5 V) and load capacitance. For reliable operation with 15 pF load, input signal transitions should allow ≥25 ns minimum pulse width to avoid output glitches.
Can 74HC21DB,118 safely interface with 5 V TTL outputs?
Yes - the 74HC21DB,118 accepts TTL-compatible input voltages: its VIH threshold is 2.1 V (min) at VCC = 4.5 V, well below the 2.4 V minimum HIGH output of standard 5 V TTL. No level-shifting circuitry is required, though series current-limiting resistors are advised if interfacing to overvoltage sources beyond VCC + 0.5 V.
Are pins 3 and 11 internally connected or truly unused?
Pins 3 and 11 are designated "n.c." (no connect) in the official Nexperia datasheet and confirmed as unconnected die bond pads in the SOT337-1 package drawing. They must remain unconnected on the PCB - no pull-up, pull-down, or routing - to prevent parasitic coupling or mechanical stress on fine-pitch leads.
Does 74HC21DB,118 support partial power-down or IOFF protection?
No - the 74HC21DB,118 lacks IOFF circuitry. When VCC = 0 V, inputs and outputs may conduct if external voltages are applied, potentially causing back-powering or latch-up. For hot-swap or partial-power-down systems, external isolation (e.g., series resistors or dedicated bus switches) is required.
74HC21DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Circuits:
- -
- Number of Inputs:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -
- Input Logic Level - Low:
- -
- Input Logic Level - High:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HC21DB,118 FAQ
1.How can I place an order for 74HC21DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC21DB,118 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 74HC21DB,118 reliable?
The price and inventory of 74HC21DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC21DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC21DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC21DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC21DB,118?
74HC21DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC21DB,118 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 74HC21DB,118?
For technical support, including 74HC21DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC21DB,118 requirements.
6.How does Aetrix verify that 74HC21DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC21DB,118 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 74HC21DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC21DB,118?
All 74HC21DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC21DB,118, 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 74HC21DB,118 part is unused and in its original packaging.
Return procedure for 74HC21DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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