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NXP Semiconductors 74HCT4520D,118
- Part No.:
- 74HCT4520D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Counters, Dividers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT4520D,118.pdf
- Description:
- NOW NEXPERIA 74HCT4520D - BINARY
- Quantity:
- Payment:
- Shipping:
Inventory:4,795
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Product details
Overview
74HCT4520D,118 from Nexperia is a dual 4-bit synchronous binary counter IC with two independent clock inputs (nCP0 and nCP1), asynchronous master reset (nMR), and buffered Q0–Q3 outputs per counter. It operates at 4.5 V to 5.5 V, supports TTL-level inputs, delivers propagation delays as low as 24 ns (VCC = 5.0 V, CL = 15 pF), and functions across –40 °C to +125 °C for industrial timing applications such as multistage frequency division.
For engineers reviewing the 74HCT4520D,118 datasheet, 74HCT4520D,118 pinout, 74HCT4520D,118 application, or 74HCT4520D,118 equivalent, key selection criteria include dual-clock edge-triggering behavior (LOW-to-HIGH on nCP0 when nCP1 = HIGH; HIGH-to-LOW on nCP1 when nCP0 = LOW), TTL-compatible input thresholds, SO16 package thermal derating (12.4 mW/K above 110 °C), and guaranteed operation up to 64 MHz at 5.0 V.
Technical Context
This device implements two independent 4-bit synchronous binary counters in a single SO16 package, each with dual-edge-triggered clock inputs enabling flexible clock enable or dual-phase counting modes. Its internal architecture uses cascaded D-type flip-flops with synchronous load logic and shared asynchronous reset.
The 74HCT4520D,118 features TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), rail-to-rail CMOS output drive (VOH ≥ 3.7 V, VOL ≤ 0.4 V at IO = ±4 mA), and input clamping diodes supporting interface to voltages exceeding VCC via external current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL systems and stable operation under industrial supply variation. |
| Input logic level | TTL-compatible - Accepts standard 5 V TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), eliminating need for level shifters in mixed-logic designs. |
| Propagation delay | 24 ns (typ, VCC = 5.0 V, CL = 15 pF) - Enables reliable operation in high-speed digital timing chains up to 64 MHz. |
| Operating temperature | –40 °C to +125 °C - Qualified for extended industrial environments including motor control and power conversion systems. |
| Output drive | ±4.0 mA (VOH/VOL guaranteed) - Sufficient to directly drive multiple 74-series inputs or small capacitive loads without buffering. |
| Power dissipation | 500 mW max (SO16), derates 12.4 mW/K above 110 °C - Supports sustained operation in thermally constrained PCB layouts. |
| ESD protection | HBM > 2000 V, CDM > 1000 V - Provides robust handling margin during board assembly and field service. |
Pinout & Package
74HCT4520D,118 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. The package supports surface-mount reflow and offers thermal performance suitable for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (1CP0, 2CP0) | Counter clock input A | LOW-to-HIGH edge-triggered; used as primary clock when corresponding CP1 is HIGH. |
| 2, 10 (1CP1, 2CP1) | Counter clock input B | HIGH-to-LOW edge-triggered; used as clock enable or secondary clock when corresponding CP0 is LOW. |
| 3–6, 11–14 (1Q0–1Q3, 2Q0–2Q3) | Binary count outputs | Buffered, active-high Q0 (LSB) to Q3 (MSB); each counter provides full 4-bit state readout. |
| 7, 15 (1MR, 2MR) | Asynchronous master reset | Active-HIGH; forces all Q outputs LOW regardless of clock state - critical for deterministic system initialization. |
| 8 | GND | Reference ground plane connection; must be low-impedance for noise immunity and timing stability. |
| 16 | VCC | Positive supply rail; decoupling capacitor (100 nF) required within 5 mm for clean switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit counters | Enables two separate timing or division paths (e.g., channel A/B in data acquisition or PWM generation) without inter-counter latency. |
| Two-edge clock architecture | Supports flexible clock gating: either CP0 or CP1 may serve as clock input while the other acts as enable - reduces external logic count. |
| TTL-compatible inputs | Eliminates level-shifting components when interfacing with legacy 5 V microcontrollers, FPGAs, or logic families. |
| Clamped inputs with IIK rating | Withstands input overvoltage up to VCC + 0.5 V using external series resistors - simplifies robustness design in noisy industrial I/O. |
| Industrial temperature range | Validated operation from –40 °C to +125 °C ensures reliability in automotive under-hood, industrial drives, and outdoor equipment. |
Applications
| Motor Control Timing | Programmable Logic Sequencing |
|---|---|
|
Use Scenario: Generating precise step/direction timing sequences for stepper motor drivers in CNC motion controllers. IC Role / Device Role / Timing Role: Dual counter provides synchronized 4-bit phase-shifted clock enables for H-bridge gate drivers and direction sequencing logic. Use Value: 24 ns propagation delay ensures sub-microsecond timing resolution; TTL inputs simplify interface with FPGA-based motion IP cores. |
Use Scenario: Implementing state-machine cycle counters in CPLD-based industrial PLC modules. IC Role / Device Role / Timing Role: One counter tracks instruction cycles, the other manages watchdog timeout intervals - both reset synchronously on system fault. Use Value: Asynchronous nMR allows immediate state reset without waiting for clock edges - critical for fail-safe response. |
| Frequency Division Chains | Digital Signal Sampling Clocking |
|
Use Scenario: Building cascaded 16-bit divide-by-N circuits for RF local oscillator synthesis in test equipment. IC Role / Device Role / Timing Role: Two 74HCT4520D,118 devices cascade (Q3→CP0) to form 8-bit stages; dual-clock mode enables glitch-free division ratio changes. Use Value: Guaranteed 64 MHz max frequency at 5 V supports division ratios down to ~200 kHz with minimal jitter accumulation. |
Use Scenario: Deriving synchronized sampling clocks for multi-channel ADCs in vibration monitoring systems. IC Role / Device Role / Timing Role: Counter outputs drive multiplexer select lines and ADC conversion triggers in lockstep with analog front-end settling time. Use Value: Buffered Q outputs deliver consistent rise/fall times (7 ns typ) - minimizes skew between sample-and-hold and conversion start signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit synchronous counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC4520D,118 | CMOS-level inputs (VIH = 3.15 V min @ VCC = 4.5 V); wider 2.0–6.0 V supply range | Better suited for mixed-voltage systems (e.g., 3.3 V MCU controlling 5 V peripherals) due to higher noise margin | Select when interfacing with CMOS logic or requiring broader VCC tolerance |
| SN74LS4520N | Bipolar TTL process; higher ICC (40 mA typical), slower (tPD ≈ 35 ns), limited to 4.75–5.25 V | Legacy replacement only; lacks ESD protection and industrial temp support | Choose only for direct LS-family drop-in where power and speed margins allow |
Compared with 74HC4520D,118 and SN74LS4520N, the 74HCT4520D,118 uniquely balances TTL input compatibility, low power (8 μA ICC standby), and extended temperature operation - making it optimal for new industrial designs requiring interoperability with legacy 5 V logic without sacrificing efficiency or ruggedness.
Availability
74HCT4520D,118 is available at Aetrix Electronics and suitable for motor control timing, programmable logic sequencing, frequency division chains, and digital signal sampling clocking requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT4520D,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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial, automotive, and consumer applications.
The 74HCT4520D,118 belongs to Nexperia's 74HCT logic family - engineered specifically for seamless integration with TTL-based microcontrollers and legacy systems while maintaining CMOS power efficiency and robustness.
FAQ
Can 74HCT4520D,118 operate reliably at 3.3 V supply?
No. The 74HCT4520D,118 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become marginal, and output drive (VOH ≥ 3.7 V) violates 3.3 V logic high requirements. For 3.3 V systems, use the 74HC4520D,118 variant instead, which supports 2.0–6.0 V and has CMOS-compatible thresholds.
What is the minimum pulse width required on nMR for reliable reset?
The minimum nMR pulse width is 20 ns at VCC = 4.5 V (25 °C). This ensures the asynchronous reset propagates through all four flip-flops. At –40 °C or +125 °C, the guaranteed minimum increases to 30 ns due to process and temperature effects on internal gate delays.
How does the dual-clock architecture prevent metastability during clock enable transitions?
The 74HCT4520D,118 avoids metastability by using edge-triggered flip-flops with setup/hold timing validated for simultaneous nCP0/nCP1 transitions. When one clock is used as enable (e.g., nCP1 held LOW), the counter advances only on nCP0 edges - no internal latching occurs on the disabled clock path, eliminating race conditions.
Is the SO16 package RoHS-compliant and lead-free?
Yes. The 74HCT4520D,118 in SOT109-1 (SO16) packaging meets RoHS Directive 2011/65/EU and is fully lead-free, with matte tin termination and halogen-free molding compound - compliant with IPC/JEDEC J-STD-020D moisture sensitivity level 3 (MSL3).
74HCT4520D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Binary Counter
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- Synchronous
- Count Rate:
- 58 MHz
- Trigger Type:
- Positive, Negative
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HCT4520D,118 FAQ
1.How can I place an order for 74HCT4520D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT4520D,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 74HCT4520D,118 reliable?
The price and inventory of 74HCT4520D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT4520D,118 is usually 5 days.
3.What payment methods are accepted for 74HCT4520D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT4520D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT4520D,118?
74HCT4520D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT4520D,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 74HCT4520D,118?
For technical support, including 74HCT4520D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT4520D,118 requirements.
6.How does Aetrix verify that 74HCT4520D,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT4520D,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 74HCT4520D,118 meets industry standards.
7.What is the process for return or replacement of 74HCT4520D,118?
All 74HCT4520D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT4520D,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 74HCT4520D,118 part is unused and in its original packaging.
Return procedure for 74HCT4520D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT4520D,118 Tags
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