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Nexperia USA Inc. 74HCT393DB,118
- Part No.:
- 74HCT393DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT393DB,118.pdf
- Description:
- IC BINARY COUNTR DL 4BIT 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,732
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Product details
Overview
74HCT393DB,118 from Nexperia is a dual 4-bit binary ripple counter IC with TTL-compatible inputs, asynchronous master reset per counter, and HIGH-to-LOW edge-triggered clocks. It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 15 ns (VCC = 4.5 V, CL = 50 pF), and supports industrial temperature range (−40 °C to +125 °C). It is used in digital timing, frequency division, and clock domain partitioning within embedded control logic.
For engineers reviewing the 74HCT393DB,118 datasheet, 74HCT393DB,118 pinout, 74HCT393DB,118 application, or 74HCT393DB,118 equivalent, this device serves as a cost-effective, drop-in-ready binary divider for legacy TTL-interfaced systems requiring dual independent 4-bit counting with minimal external components and no clock synchronization overhead.
Technical Context
The 74HCT393DB,118 implements two independent 4-stage ripple counters using T-type flip-flops cascaded in series, where each stage toggles on the falling edge of its input clock. Count advances asynchronously-output transitions propagate through Q0→Q1→Q2→Q3 with cumulative delay, enabling divide-by-2n (n = 1–8) functionality per counter.
Each counter has dedicated asynchronous active-HIGH master reset (1MR/2MR) that forces all four outputs LOW regardless of clock state. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors-critical for mixed-voltage system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure direct interface with legacy 5 V TTL logic without level shifters. |
| Supply Voltage Range | 4.5 V to 5.5 V - Matches standard 5 V rail tolerance; avoids undervoltage lockout or overvoltage stress in industrial power domains. |
| Max Clock Frequency | 48 MHz at VCC = 4.5 V, CL = 50 pF - Supports high-speed division (e.g., 100 MHz → 390 kHz via /256) in signal conditioning and prescaling applications. |
| Propagation Delay (nCP→nQ0) | 15 ns (typ), 38 ns (max) at VCC = 4.5 V - Determines minimum clock period and worst-case timing margin for downstream logic sampling. |
| Output Drive Strength | ±4 mA at VCC = 4.5 V - Sufficient to drive 10 LSTTL loads or short PCB traces without buffering; limits fan-out but reduces power and EMI. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood automotive modules, motor drives, and industrial PLC I/O subsystems. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Enables robust handling during board assembly and field service without special ESD precautions. |
Pinout & Package
Packaged in SO14 (SOT108-1): plastic small outline, 14-lead, 3.9 mm body width, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1CP) | Counter 1 clock input | Falling-edge triggered; initiates toggle of 1Q0 and propagates ripple through 1Q1–1Q3; requires clean, monotonic transition. |
| 2 (1MR) | Counter 1 master reset | Asynchronous active-HIGH; clears all four stages immediately-no clock dependency; critical for deterministic startup or fault recovery. |
| 3–6 (1Q0–1Q3) | Counter 1 outputs | Buffered complementary CMOS outputs; Q0 = LSB, Q3 = MSB; represent binary count modulo 16 (0–15). |
| 7 (GND) | Ground reference | Primary 0 V return path; must be low-inductance connection to minimize ground bounce during output switching. |
| 8–11 (2Q3–2Q0) | Counter 2 outputs | Order reversed vs. pin numbering (2Q3 on pin 8, 2Q0 on pin 11); enables compact PCB routing for parallel readout of both counters. |
| 12 (2MR) | Counter 2 master reset | Independent of Counter 1; allows selective reset without disturbing the other counter-key for multi-channel event timing. |
| 13 (2CP) | Counter 2 clock input | Electrically identical to 1CP; supports separate clock domains (e.g., system clock vs. sensor sample clock). |
| 14 (VCC) | Positive supply | Must be decoupled locally (e.g., 100 nF ceramic) near pin 14 to suppress switching noise coupling into internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit counters | Enables simultaneous division by two different powers of two (e.g., /16 and /256) in one IC-reduces component count vs. discrete 74-series solutions. |
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels directly, eliminating level translators in mixed-logic designs and simplifying legacy system upgrades. |
| Asynchronous master reset per counter | Allows precise, clock-independent initialization of either counter-essential for synchronized start-up in multi-stage timing chains. |
| Wide operating temperature range | −40 °C to +125 °C rating ensures reliable operation in harsh environments like industrial motor controllers and automotive body electronics. |
| Low dynamic power dissipation | CPD = 25 pF enables predictable dynamic power calculation (PD = CPD × VCC² × fin × N), supporting thermal-aware design in space-constrained layouts. |
Applications
| Industrial Motor Control | Legacy System Timing Upgrade |
|---|---|
|
Use Scenario: Monitoring encoder pulses from a BLDC motor to derive RPM and position feedback in a closed-loop drive. IC Role / Device Role / Timing Role: Each counter divides encoder quadrature signals (A/B) by 16 to reduce interrupt load on MCU; 1MR/2MR enable synchronized zero-reset on index pulse. Use Value: Reduces CPU interrupt frequency by factor of 16 while preserving resolution integrity-enabling real-time control on resource-limited microcontrollers. |
Use Scenario: Replacing obsolete 74LS393 in a vintage test equipment mainframe requiring stable 5 V TTL-compatible timing. IC Role / Device Role / Timing Role: Direct pin-for-pin replacement providing identical function with lower power, higher noise immunity, and extended temperature range. Use Value: Eliminates need for redesign or adapter boards-extends product lifecycle and reduces obsolescence risk without compromising timing behavior. |
| Digital Signal Prescaling | Multi-Channel Event Logging |
|
Use Scenario: Conditioning high-frequency sensor data (e.g., ultrasonic echo returns) before ADC sampling to avoid aliasing. IC Role / Device Role / Timing Role: First counter divides 10 MHz clock by 256 to generate 39.0625 kHz sampling clock; second counter tracks overflow events for timestamping. Use Value: Achieves precise sub-microsecond timing granularity with zero software overhead-critical for time-of-flight measurement accuracy. |
Use Scenario: Capturing timestamps of asynchronous external interrupts (e.g., safety door open/close, emergency stop) across four independent zones. IC Role / Device Role / Timing Role: Each counter assigned to one zone; 1CP/2CP driven by debounced interrupt edges; 1Q0–1Q3 latched on system sync pulse. Use Value: Provides hardware-based, glitch-free 4-bit event counters per channel-eliminates race conditions and software polling latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual binary counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC393DB,118 | CMOS-input version; VIH = 3.15 V min at VCC = 4.5 V; higher noise margin but incompatible with pure TTL drivers. | Suitable only in 3.3 V–5 V CMOS systems; cannot interface directly to 5 V TTL without pull-ups or buffers. | Select when system uses exclusively CMOS logic and maximum noise immunity is required. |
| SN74LV393APWR | Lower voltage range (2.0–5.5 V); LV logic family offers better drive at 3.3 V; tpd = 17 ns (VCC = 3.3 V). | Better fit for mixed-voltage 3.3 V/5 V designs; supports direct interface to modern low-voltage MCUs and FPGAs. | Choose for new designs targeting 3.3 V operation or requiring broader supply flexibility than fixed 5 V. |
Compared with 74HC393DB,118 and SN74LV393APWR, the 74HCT393DB,118 uniquely bridges legacy 5 V TTL systems and modern CMOS infrastructure-offering guaranteed TTL-level compatibility without sacrificing industrial temperature range or ripple-counter functionality.
Availability
74HCT393DB,118 is available at Aetrix Electronics and suitable for industrial motor control, legacy system timing upgrades, digital signal prescaling, and multi-channel event logging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT393DB,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 specializing in high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT393DB,118 belongs to Nexperia's 74HCT logic family-designed specifically for seamless migration from legacy TTL systems while delivering improved power efficiency, noise immunity, and thermal robustness.
FAQ
What is the maximum clock frequency supported by the 74HCT393DB,118?
The 74HCT393DB,118 supports up to 48 MHz at VCC = 4.5 V with CL = 50 pF (−40 °C to +85 °C). At full industrial range (−40 °C to +125 °C), max clock frequency drops to 22 MHz under same conditions. This limit arises from cumulative ripple delay across four flip-flops and is specified in Table 7 of the datasheet.
Can the two counters operate with different clock sources?
Yes-1CP (pin 1) and 2CP (pin 13) are electrically isolated clock inputs, allowing independent clock domains. Each counter advances only on its own falling-edge clock; no internal synchronization exists between them. This enables use cases like dual-channel frequency measurement or asynchronous event counting.
Is the 74HCT393DB,118 pin-compatible with older 74LS393 devices?
Yes-the 74HCT393DB,118 uses the same SO14 (SOT108-1) package and identical pinout as the 74LS393, including 1CP, 1MR, Q0–Q3, GND, Q3–Q0 (reversed order), 2MR, 2CP, and VCC. No PCB redesign is needed for drop-in replacement, though VCC decoupling and layout practices should follow CMOS guidelines.
Does the 74HCT393DB,118 require external pull-up or pull-down resistors on unused inputs?
No-unused inputs (e.g., one clock or reset) may be tied directly to VCC or GND. The device includes internal input clamp diodes and has no floating-input sensitivity; however, tying unused clocks to GND prevents unintended toggling, and tying unused resets to GND ensures they remain inactive.
74HCT393DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Binary Counter
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- -
- Count Rate:
- 107 MHz
- Trigger Type:
- Negative Edge
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SSOP
74HCT393DB,118 FAQ
1.How can I place an order for 74HCT393DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT393DB,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 74HCT393DB,118 reliable?
The price and inventory of 74HCT393DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT393DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT393DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT393DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT393DB,118?
74HCT393DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT393DB,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 74HCT393DB,118?
For technical support, including 74HCT393DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT393DB,118 requirements.
6.How does Aetrix verify that 74HCT393DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT393DB,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 74HCT393DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT393DB,118?
All 74HCT393DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT393DB,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 74HCT393DB,118 part is unused and in its original packaging.
Return procedure for 74HCT393DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT393DB,118 Tags
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