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STMicroelectronics M74HC161RM13TR
- Part No.:
- M74HC161RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Counters, Dividers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M74HC161RM13TR.pdf
- Description:
- IC BINARY COUNTER 4-BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,123
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Product details
Overview
M74HC161RM13TR from STMicroelectronics is a high-speed CMOS synchronous 4-bit binary presettable counter with asynchronous clear, synchronous parallel load, and cascading carry logic. It operates from 2V to 6V, delivers 62 MHz max clock frequency at 6V, features ±4 mA output drive, and supports industrial temperature range (−55°C to +125°C). Used in digital timing control, address sequencing, and event counting circuits.
For engineers reviewing the M74HC161RM13TR datasheet, M74HC161RM13TR pinout, M74HC161RM13TR application, or M74HC161RM13TR equivalent, key selection criteria include synchronous preset capability, asynchronous reset behavior, TSSOP-16 package compatibility, and cascading support via TE/PE enable inputs and CARRY output.
Technical Context
The M74HC161RM13TR implements a 4-bit binary counter with rising-edge-triggered clock, asynchronous active-low CLEAR, and synchronous active-low LOAD. Count enable is controlled by two independent inputs-PE (Parallel Enable) and TE (Terminal Count Enable)-enabling flexible cascade configuration without external logic.
Its carry generation logic (CARRY = TE·QA·QB·QC·QD) ensures deterministic propagation for N-bit counter chains. All inputs include ESD protection, and symmetrical output impedance (|IOH| = IOL ≥ 4 mA) guarantees robust signal integrity across rail-to-rail voltage operation (2–6 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-powered logic |
| Max Clock Frequency | 62 MHz (typ.) at VCC = 6 V - enables high-speed counting in real-time control loops |
| Output Drive Strength | ±4 mA (min.) - drives standard TTL/CMOS loads directly without buffering |
| Propagation Delay (CLK→Q) | 14 ns (max.) at VCC = 6 V - ensures tight timing margins in synchronous state machines |
| Quiescent Current | 4 µA (max.) at TA = 25°C - minimizes standby power in always-on embedded counters |
| Operating Temperature | −55°C to +125°C - qualified for automotive under-hood and industrial motor control environments |
| Input Noise Immunity | 28% VCC (min.) - rejects common-mode noise in electrically noisy factory settings |
Pinout & Package
TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, thin-profile surface-mount with exposed pad not present; RoHS-compliant, moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLEAR) | Asynchronous master reset | Forces all outputs QA–QD low immediately, independent of clock edge |
| 2 (CLOCK) | Rising-edge counter trigger | Advances count only on clean, monotonic low-to-high transitions |
| 3–6 (A–D) | Synchronous parallel data inputs | Loads preset value into QA–QD on next clock rising edge when LOAD = L |
| 7 (PE) | Parallel enable control | Enables synchronous loading; must be low for LOAD to take effect |
| 9 (LOAD) | Active-low parallel load strobe | Triggers data capture from A–D only when PE = L and clock rises |
| 10 (TE) | Terminal count enable input | Gates CARRY output; CARRY = H only when TE = H and QA–QD = 1111 |
| 11–14 (QA–QD) | 4-bit binary counter outputs | QA = LSB, QD = MSB; edge-aligned with clock, no internal glitches |
| 15 (CARRY) | Cascadable terminal count flag | Indicates overflow (15→0 transition); used to enable next-stage counter |
| 8 (GND) | Digital ground reference | Return path for all input/output currents; requires low-impedance PCB plane |
| 16 (VCC) | Positive supply rail | Must be decoupled locally with 100 nF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous preset with asynchronous clear | Enables precise initialization and emergency reset in safety-critical sequencers |
| Cascadable carry logic (TE-gated) | Permits modular construction of 8-, 12-, or 16-bit counters using identical parts |
| Wide 2–6 V supply range | Interoperates with both 3.3 V microcontrollers and legacy 5 V logic families |
| High noise immunity (28% VCC) | Rejects >1.2 V peak noise on control lines in motor-drive or relay-switching PCBs |
| Low ICC (4 µA max) | Reduces total system quiescent current in battery-backed real-time clocks or metering ICs |
Applications
| Industrial PLC Counter Module | Automotive Gear Position Encoder |
|---|---|
Use Scenario: Counts encoder pulses from rotary sensors to track machine cycle position in packaging line controllers. IC Role / Device Role / Timing Role: Synchronous 4-bit counter stage in multi-stage modulo-N counter chain, synchronized to system clock. Use Value: Deterministic carry propagation enables accurate 16-bit position resolution using four cascaded M74HC161RM13TR units. | Use Scenario: Monitors gear selector switch transitions in transmission control units to detect neutral/sport mode changes. IC Role / Device Role / Timing Role: Edge-triggered event counter capturing mechanical switch bounce-free state transitions. Use Value: Asynchronous CLEAR allows immediate reset on gear shift detection; wide VCC range tolerates vehicle battery fluctuations (9–16 V). |
| Energy Meter Pulse Accumulator | Legacy Bus Address Generator |
Use Scenario: Integrates kWh pulse outputs from metrology ICs over billing intervals in smart electricity meters. IC Role / Device Role / Timing Role: Low-power, high-immunity counter accumulating 1 Hz–10 kHz pulses under battery backup. Use Value: 4 µA max ICC extends 10-year battery life; 28% VCC noise margin prevents false counts from EMI near AC mains. | Use Scenario: Generates sequential memory-mapped peripheral addresses in 8-bit microcontroller expansion buses. IC Role / Device Role / Timing Role: Synchronous presettable counter providing stable, glitch-free address bus increments. Use Value: Parallel LOAD enables instant address jump to register banks; TSSOP-16 footprint saves space on dense control boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous 4-bit counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC161PWR | Same logic function, 16-pin TSSOP, but TI-specified tPLH/tPHL ≤ 26 ns (VCC=6V), slightly higher ICC (8 µA max) | Approved for extended commercial temp range only (−40°C to +85°C), not automotive-grade | Select when cost-sensitive designs require TI's distribution network and accept reduced temperature margin |
| 74VHC161FT | Higher speed (fMAX = 115 MHz @ VCC = 5 V), lower propagation delay (tPLH ≤ 5.5 ns), but narrower VCC range (2–5.5 V) | Not rated for −55°C operation; lacks ST's extended industrial qualification | Choose for high-frequency test equipment where sub-10 ns timing is mandatory and supply is regulated at 5 V |
Compared with SN74HC161PWR and 74VHC161FT, the M74HC161RM13TR uniquely combines −55°C to +125°C operation, 4 µA ultra-low ICC, and full 2–6 V flexibility-making it optimal for harsh-environment, battery-constrained, or mixed-voltage industrial systems.
Availability
M74HC161RM13TR is available at Aetrix Electronics and suitable for industrial PLC modules, automotive transmission controllers, and smart energy metering systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for M74HC161RM13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The M74HC161RM13TR belongs to ST's legacy HC logic family-engineered for pin- and function-compatible replacement of 74LS/74F logic in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the minimum setup time required for the LOAD input relative to CLOCK?
The minimum setup time (ts) for LOAD is 8 ns at VCC = 6 V and TA = 25°C, increasing to 21 ns across the full −55°C to +125°C range. This ensures reliable capture of the parallel load command before the rising clock edge, preventing metastability in synchronous preset operations.
Can M74HC161RM13TR operate reliably at 2.0 V supply?
Yes-it is fully specified down to 2.0 V, with fMAX = 6.2 MHz (min.), tPLH ≤ 155 ns, and VIH/VIL thresholds scaled to 28% of VCC. This enables interoperability with 2.5 V or 2.7 V microcontrollers and battery-powered sensor nodes.
How does the CARRY output behave during asynchronous CLEAR?
During asynchronous CLEAR (pin 1 = L), CARRY goes low within tPHL(CLEAR→CARRY) ≤ 51 ns at VCC = 6 V and is held low regardless of TE or count state. This provides predictable reset behavior for downstream cascade stages.
Is the TSSOP-16 package of M74HC161RM13TR lead-free and RoHS compliant?
Yes-the M74HC161RM13TR uses a matte-tin lead finish, meets EU RoHS Directive 2011/65/EU, and is rated MSL3 per J-STD-020. No lead exemption is applied; Pb-free reflow profile (peak 260°C) is supported.
M74HC161RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 62 MHz
- Trigger Type:
- Positive Edge
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
M74HC161RM13TR FAQ
1.How can I place an order for M74HC161RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC161RM13TR 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 M74HC161RM13TR reliable?
The price and inventory of M74HC161RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC161RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC161RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC161RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC161RM13TR?
M74HC161RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC161RM13TR 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 M74HC161RM13TR?
For technical support, including M74HC161RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC161RM13TR requirements.
6.How does Aetrix verify that M74HC161RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC161RM13TR 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 M74HC161RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC161RM13TR?
All M74HC161RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC161RM13TR, 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 M74HC161RM13TR part is unused and in its original packaging.
Return procedure for M74HC161RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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