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Nexperia USA Inc. 74HC161D,652
- Part No.:
- 74HC161D,652
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC161D,652.pdf
- Description:
- IC BINARY COUNTER 4-BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,357
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Product details
Overview
74HC161D,652 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 generation, and frequency division circuits.
For engineers reviewing the 74HC161D,652 datasheet, 74HC161D,652 pinout, 74HC161D,652 application, or 74HC161D,652 equivalent, key selection criteria include its asynchronous clear behavior, positive-edge clock triggering, guaranteed operation at -40 °C to +125 °C, and SO16 package compatibility with industrial control logic designs.
Technical Context
The 74HC161D implements four edge-triggered D-type flip-flops with synchronous counting and parallel loading. Its look-ahead carry architecture enables low-latency cascading: TC asserts only when CET = HIGH and Q3Q2Q1Q0 = 1111, with propagation delay from CP to TC as low as 18 ns at VCC = 6.0 V.
Asynchronous MR overrides all inputs-including CP, PE, CEP, and CET-to force Q0–Q3 LOW immediately. Counting requires both CEP and CET HIGH; TC feeds forward to enable the next stage, and its pulse width matches Q0's HIGH time, ensuring deterministic inter-stage synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive modules and industrial PLCs requiring extended thermal margin. |
| CP to TC Propagation Delay | 18 ns (typ) at VCC = 6.0 V - Supports >27 MHz maximum clock frequency in single-stage operation. |
| Input Voltage Thresholds | VIH = 3.15 V (min), VIL = 1.35 V (max) at VCC = 4.5 V - Provides 0.8 V noise margin against TTL/CMOS logic switching transients. |
| Terminal Count Pulse Width | ≈ Q0 HIGH duration - Enables precise edge-aligned enabling of downstream counters without external timing compensation. |
| Power Dissipation Capacitance | 33 pF - Allows accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal budgeting in dense PCB layouts. |
| ESD Protection | HBM >2000 V, CDM >1000 V - Reduces need for external ESD protection in board-level I/O routing. |
Pinout & Package
74HC161D,652 is housed in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is MR (asynchronous reset); pin 2 is CP (positive-edge clock); pins 3–6 are D0–D3 (parallel data inputs); pin 7 is CEP (count enable parallel); pin 8 is GND; pin 9 is PE (active-low parallel enable); pin 10 is CET (count enable carry); pins 11–14 are Q3–Q0 (outputs, LSB-first order); pin 15 is TC (terminal count); pin 16 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MR (Pin 1) | Asynchronous master reset | Forces Q0–Q3 LOW independent of clock or enable states-critical for system initialization and fault recovery. |
| CP (Pin 2) | Clock input | Positive-edge triggered; all flip-flops update simultaneously-ensures glitch-free state transitions and eliminates ripple delay. |
| D0–D3 (Pins 3–6) | Parallel data inputs | Load preset value into counter on next CP edge when PE = LOW-enables arbitrary start counts without sequential incrementing. |
| PE (Pin 9) | Parallel enable | Active-low control: disables counting and enables parallel load regardless of CEP/CET levels-decouples load timing from count enable logic. |
| CEP / CET (Pins 7 / 10) | Count enable inputs | Both must be HIGH to advance count; CET also gates TC output-allows hierarchical enable control across cascaded stages. |
| Q0–Q3 (Pins 14,13,12,11) | Binary counter outputs | Q0 is LSB; outputs reflect current count modulo 16-used directly for address indexing or modulo-N timing. |
| TC (Pin 15) | Terminal count output | HIGH only when CET = HIGH and Q3Q2Q1Q0 = 1111-provides clean carry signal for multi-stage counters without external decode logic. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous presettable counting | Enables immediate loading of any 4-bit value on clock edge-eliminates up-to-15-cycle delays in reinitialization sequences. |
| Look-ahead carry architecture | Reduces inter-stage propagation delay by avoiding ripple-through dependency-supports reliable 16-bit+ counters at >10 MHz. |
| Asynchronous master reset (MR) | Guarantees deterministic zero-state entry within 18 ns (max) at VCC = 6.0 V-essential for fail-safe system resets. |
| Wide supply voltage range (2.0–6.0 V) | Permits direct use in mixed-voltage systems (e.g., 3.3 V MCU controlling 5 V peripheral logic) without external regulators. |
| High noise immunity | Input thresholds maintain ≥0.8 V DC noise margin across full temperature range-reduces susceptibility to crosstalk in high-density digital boards. |
Applications
| Industrial PLC Timer Modules | Serial Communication Baud Rate Generators |
|---|---|
Use Scenario: Generating precise 100 ms and 1 s timing intervals in programmable logic controller scan cycles. IC Role / Device Role / Timing Role: 4-bit counter configured in modulo-10 or modulo-16 mode, with TC driving interrupt request lines or relay driver enable signals. Use Value: Eliminates software-based timing loops, reducing CPU load and jitter; asynchronous MR ensures deterministic restart after watchdog timeout. |
Use Scenario: Deriving UART baud clock frequencies (e.g., 9600, 19200, 38400 bps) from a 1.8432 MHz crystal oscillator. IC Role / Device Role / Timing Role: Cascaded 74HC161D stages divide master clock by integer factors (e.g., ÷192 for 9600 bps), with TC feeding next-stage enable. Use Value: Achieves exact baud rates without fractional dividers or PLL complexity; look-ahead carry maintains timing accuracy across multi-stage division. |
| LED Display Multiplexing Controllers | Test Equipment Frequency Dividers |
Use Scenario: Scanning 16-segment LED displays using 4-bit row/column addressing with synchronized blanking. IC Role / Device Role / Timing Role: Counter drives column select lines while TC strobes display latch and refresh control logic. Use Value: Ensures uniform segment brightness by guaranteeing equal on-time per column; parallel load allows dynamic reconfiguration of scan sequence. |
Use Scenario: Building modular frequency divider units for benchtop signal generators with selectable ÷2, ÷4, ..., ÷16 outputs. IC Role / Device Role / Timing Role: Configured as fixed-modulo counter; TC output routed to SMA connector as divided clock reference. Use Value: Delivers sub-ns jitter performance due to synchronous design-superior to RC-based or asynchronous divider alternatives. |
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 |
|---|---|---|---|
| SN74HC161N | Dual count-enable (CEP/CET) and TC output identical; same SO16 footprint but TI packaging spec differs slightly in lead coplanarity tolerance. | Validated in TI-reference designs for motor control timing; lacks Nexperia's -40 °C to +125 °C qualification documentation traceability. | Select when sourcing from TI-authorized channels or when legacy TI design reuse is required; verify thermal derating curves match your ambient profile. |
| 74HCT161D | TTL-compatible input thresholds (VIH = 2.0 V min) vs. CMOS (VIH = 3.15 V min); otherwise identical function, pinout, and timing. | Preferred for interfacing with legacy 5 V TTL microcontrollers where input drive strength may be marginal for pure CMOS inputs. | Choose only when interfacing with true 5 V TTL outputs; avoid in mixed 3.3 V/5 V systems where HCT's higher input current could affect signal integrity. |
Compared with SN74HC161N and 74HCT161D, the 74HC161D,652 offers superior thermal qualification evidence for extended-temperature industrial use and tighter VIH/VIL margins for robust noise immunity-making it optimal for new designs prioritizing long-term reliability over legacy compatibility.
Availability
74HC161D,652 is available at Aetrix Electronics and suitable for industrial automation controllers, test equipment timing subsystems, and LED display drivers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 74HC161D,652 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, analog, and discrete components optimized for efficiency, reliability, and manufacturability in high-volume applications.
The 74HC161D belongs to Nexperia's 74HC high-speed CMOS logic family, engineered for low-power, noise-immune digital control in industrial, consumer, and communication systems operating across wide voltage and temperature ranges.
FAQ
What is the maximum clock frequency supported by the 74HC161D,652?
The maximum clock frequency is 48 MHz at VCC = 6.0 V and CL = 15 pF, per Table 7. At standard 50 pF load and VCC = 4.5 V, fmax drops to 40 MHz. This limit arises from CP-to-Qn propagation delay (38 ns typ) and setup/hold timing constraints-not from power or thermal limits.
Can the 74HC161D,652 be used in a 3.3 V system?
Yes: the device is fully specified from 2.0 V to 6.0 V, and VIH/VIL thresholds scale with VCC. At VCC = 3.3 V, VIH(min) ≈ 2.3 V and VIL(max) ≈ 1.0 V, providing >0.6 V noise margin-compatible with standard 3.3 V CMOS outputs and LVTTL interfaces.
How does the terminal count (TC) output behave during cascading?
TC goes HIGH only when CET = HIGH and Q3Q2Q1Q0 = 1111. In cascaded configurations, TC from stage N drives CET of stage N+1, enabling the next stage on the same clock edge. The TC pulse width equals Q0's HIGH time, ensuring reliable setup for downstream enable logic without added delay elements.
Is the parallel load function synchronous or asynchronous?
Parallel load is synchronous: data at D0–D3 is latched into Q0–Q3 only on the positive-going edge of CP when PE = LOW. This behavior is independent of CEP/CET states and occurs even if counting is disabled-ensuring deterministic, clock-aligned presetting without metastability risk.
74HC161D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SO
74HC161D,652 FAQ
1.How can I place an order for 74HC161D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC161D,652 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 74HC161D,652 reliable?
The price and inventory of 74HC161D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC161D,652 is usually 5 days.
3.What payment methods are accepted for 74HC161D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC161D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC161D,652?
74HC161D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC161D,652 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 74HC161D,652?
For technical support, including 74HC161D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC161D,652 requirements.
6.How does Aetrix verify that 74HC161D,652 is sourced from the original manufacturer or authorized distributors?
All 74HC161D,652 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 74HC161D,652 meets industry standards.
7.What is the process for return or replacement of 74HC161D,652?
All 74HC161D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC161D,652, 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 74HC161D,652 part is unused and in its original packaging.
Return procedure for 74HC161D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC161D,652 Tags
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