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Nexperia USA Inc. 74HC161PW,118
- Part No.:
- 74HC161PW,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC161PW,118.pdf
- Description:
- IC BINARY COUNTER 4-BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
74HC161PW,118 from Nexperia is a synchronous presettable 4-bit binary counter with asynchronous master reset (MR), internal look-ahead carry, dual count-enable inputs (CEP/CET), and parallel load capability via active-low PE. It operates from 2.0 V to 6.0 V, delivers TC output pulse width ≈ Q0 HIGH duration, and supports cascading up to n-bit counters. Used in digital timing control, address sequencing, and event counting circuits.
For engineers reviewing the 74HC161PW,118 datasheet, 74HC161PW,118 pinout, 74HC161PW,118 application, or 74HC161PW,118 equivalent, key selection factors include its positive-edge-triggered clock (CP), guaranteed operation from –40 °C to +125 °C, TSSOP16 package footprint, and compatibility with standard 74HC logic voltage thresholds.
Technical Context
The 74HC161PW implements four edge-triggered D-type flip-flops with synchronous counting and parallel loading. Its look-ahead carry architecture minimizes propagation delay in cascaded configurations by enabling TC generation independent of ripple-through delays.
Counting requires both CEP and CET high; TC asserts only when CET = HIGH and Q3–Q0 = HHHH. Asynchronous MR overrides all inputs, forcing Q0–Q3 LOW immediately - critical for deterministic system initialization and fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC CMOS - ensures low static power, high noise immunity, and compatibility with TTL input levels |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered operation |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications |
| Max Clock Frequency | 48 MHz at VCC = 4.5 V - enables high-speed counting in real-time control loops |
| Propagation Delay (CP to Qn) | 38 ns max at VCC = 4.5 V - defines minimum clock period for reliable state transitions |
| Terminal Count Pulse Width | ≈ duration of Q0 HIGH - provides precise, self-timed enable signal for next-stage cascading |
| Input Clamping Diodes | Integrated - allows safe interface to voltages exceeding VCC using current-limiting resistors |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1); 16-pin, 4.4 mm body width, 0.65 mm pitch; RoHS-compliant, lead-free termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Asynchronous master reset | Active-LOW signal that forces Q0–Q3 = LOW regardless of CP, PE, or enable states |
| 2 (CP) | Clock input | Positive-edge-triggered; all flip-flops update simultaneously on rising edge |
| 3–6 (D0–D3) | Data inputs | Load values into counter on rising CP edge when PE = LOW |
| 7 (CEP) | Count enable parallel | Must be HIGH with CET for counting; enables internal carry logic |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; decoupling capacitor required |
| 9 (PE) | Parallel enable | Active-LOW; enables synchronous loading of D0–D3 independent of CEP/CET state |
| 10 (CET) | Count enable carry | Must be HIGH with CEP to count; feeds forward to enable TC output |
| 11–14 (Q0–Q3) | Counter outputs | Q0 LSB to Q3 MSB; binary-weighted outputs updated synchronously on CP edge |
| 15 (TC) | Terminal count | Active-HIGH pulse asserted when CET = HIGH and Q3–Q0 = HHHH; width ≈ Q0 HIGH time |
| 16 (VCC) | Supply voltage | 2.0 V to 6.0 V DC; requires local 100 nF ceramic decoupling near pin |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous presettable counting | Enables deterministic state loading and counting without race conditions or metastability |
| Look-ahead carry output (TC) | Eliminates ripple-carry delay in multi-stage counters, supporting higher overall system clock rates |
| Dual count-enable inputs (CEP/CET) | Allows hierarchical enable control - e.g., CEP for local stage, CET for global cascade synchronization |
| Asynchronous master reset (MR) | Guarantees immediate, clock-independent zero-state initialization for safety-critical resets |
| Wide supply range (2.0–6.0 V) | Permits direct interfacing with 3.3 V microcontrollers and 5 V legacy peripherals without level shifters |
Applications
| Industrial PLC Timing Modules | Digital Panel Meter Address Sequencing |
|---|---|
Use Scenario: Generating precise 16-step timing intervals for motor phase control in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronous 4-bit counter providing deterministic clock-divided timing signals with TC-driven stage advancement. Use Value: Look-ahead carry ensures sub-40 ns inter-stage delay, enabling >20 kHz loop update rates across 4 cascaded stages. | Use Scenario: Scanning 16-segment LED displays or multiplexed analog input channels in portable test equipment. IC Role / Device Role / Timing Role: Address generator cycling through channel select lines using parallel load for dynamic range reconfiguration. Use Value: Active-low PE allows on-the-fly address presetting via microcontroller GPIO, eliminating software wait states. |
| Legacy Bus Interface Counters | Power Supply Soft-Start Sequencers |
Use Scenario: Managing memory-mapped I/O address decoding in 8-bit microprocessor systems (e.g., Z80, 8085). IC Role / Device Role / Timing Role: Binary counter generating chip-select strobes synchronized to bus clock edges. Use Value: Positive-edge CP and CMOS input thresholds ensure clean setup/hold timing with TTL-compatible bus drivers. | Use Scenario: Controlling staged turn-on of multiple DC-DC converters in telecom power modules. IC Role / Device Role / Timing Role: Cascaded counter driving discrete MOSFET gate drivers via TC outputs to enforce strict power-up sequence. Use Value: Asynchronous MR guarantees simultaneous hard reset of all converter enable lines during fault recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit synchronous counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC163PW,118 | Synchronous reset instead of asynchronous MR; identical pinout and function otherwise | Requires clocked reset assertion - unsuitable where immediate, clock-independent clear is mandatory | Select when system-level reset coordination allows synchronous timing and deterministic pipeline behavior |
| SN74HC161PWR | Same logic function and pinout; TI-manufactured, SOT-23-16 package variant | Identical electrical specs but different thermal resistance and moisture sensitivity level (MSL 3 vs MSL 1) | Choose for TI-design ecosystems or when alternate sourcing from authorized TI distributors is required |
Compared with 74HC161PW,118, the 74HC163PW,118 trades asynchronous reset for tighter timing control in synchronous systems, while SN74HC161PWR offers identical functionality with differing packaging logistics and qualification documentation - both require validation of thermal derating and board-level ESD handling.
Availability
74HC161PW,118 is available at Aetrix Electronics and suitable for industrial automation timing, digital instrumentation sequencing, and power management soft-start applications requiring stable component supply across extended temperature ranges.
Supply support for 74HC161PW,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, reliable logic, discrete, and MOSFET solutions optimized for efficiency and robustness in mass-market electronics.
The 74HC logic family targets cost-sensitive, high-volume industrial and consumer applications where low power, wide voltage operation, and proven interoperability with legacy TTL systems are essential design requirements.
FAQ
What is the maximum clock frequency supported by the 74HC161PW,118 at 3.3 V supply?
At VCC = 3.3 V, the maximum clock frequency is not explicitly specified in the datasheet, but interpolation between the 2.0 V (625 ns/V) and 4.5 V (1.67 ns/V) transition rate data indicates fmax ≈ 30 MHz. For production designs, use the 25 MHz derated value per JEDEC JESD8C guidelines to ensure margin across process and temperature variation.
Can the 74HC161PW,118 be used with a 3.3 V microcontroller driving its inputs?
Yes - VIH(min) = 2.1 V and VIL(max) = 1.35 V at VCC = 4.5 V, and the device meets JESD8C (2.7–3.6 V) compliance. A 3.3 V MCU's VOH(≥2.4 V) and VOL(≤0.4 V) fully satisfy these thresholds, enabling direct connection without level translation.
How does the terminal count (TC) output behave during cascading?
TC goes HIGH when CET = HIGH and Q3–Q0 = HHHH (15 decimal). Its pulse width matches Q0's HIGH time, allowing it to directly drive the CEP/CET inputs of the next stage. This eliminates external gating logic and ensures minimal inter-stage skew in multi-counter chains.
Is the 74HC161PW,118 suitable for automotive applications?
No - this part is not AEC-Q100 qualified. The datasheet explicitly states "non-automotive qualified products" and prohibits use in safety-critical or life-support systems. For automotive designs, consult Nexperia's Automotive Logic portfolio (e.g., 74AHC161-Q100) with full qualification documentation.
74HC161PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Binary Counter
- Direction:
- Up
- Number of Elements:
- 1
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- Synchronous
- Count Rate:
- 48 MHz
- Trigger Type:
- Positive Edge
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HC161PW,118 FAQ
1.How can I place an order for 74HC161PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC161PW,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 74HC161PW,118 reliable?
The price and inventory of 74HC161PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC161PW,118 is usually 5 days.
3.What payment methods are accepted for 74HC161PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC161PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC161PW,118?
74HC161PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC161PW,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 74HC161PW,118?
For technical support, including 74HC161PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC161PW,118 requirements.
6.How does Aetrix verify that 74HC161PW,118 is sourced from the original manufacturer or authorized distributors?
All 74HC161PW,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 74HC161PW,118 meets industry standards.
7.What is the process for return or replacement of 74HC161PW,118?
All 74HC161PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC161PW,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 74HC161PW,118 part is unused and in its original packaging.
Return procedure for 74HC161PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC161PW,118 Tags
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74HC393BQ,115
Nexperia USA Inc.
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Texas Instruments
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MC14516BDR2G
onsemi
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MC14020BDR2G
onsemi
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onsemi
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onsemi
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MC100EP016AFAG
onsemi
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SN74HC161DR
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