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Nexperia USA Inc. 74HC123PW,112
- Part No.:
- 74HC123PW,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC123PW,112.pdf
- Description:
- IC MULTIVIBRATOR 65NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,464
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Product details
Overview
74HC123PW,112 from Nexperia is a dual retriggerable monostable multivibrator in TSSOP16 package, operating from 2.0 V to 6.0 V supply, with Schmitt-trigger inputs (1A/1B/2A/2B), independent reset inputs (1RD/2RD), and programmable pulse width via external REXT/CEXT networks. It delivers precise timing control for edge-sensitive event stretching and pulse termination in digital logic systems.
For engineers reviewing the 74HC123PW,112 datasheet, 74HC123PW,112 pinout, 74HC123PW,112 application, or 74HC123PW,112 equivalent, key selection criteria include retriggerable pulse extension capability, dual independent monostable channels, TTL/CMOS input compatibility (HC variant), -40 °C to +125 °C operation, and TSSOP16 thermal performance under dynamic load conditions.
Technical Context
This device implements two independent monostable circuits, each with separate negative-edge (nA) and positive-edge (nB) trigger inputs, direct active-low reset (nRD), and complementary outputs (nQ/nQ). Pulse width is externally set by REXT and CEXT, supporting programmable delays from ~75 ns (REXT = 5 kΩ, CEXT = 0 pF) up to milliseconds (e.g., REXT = 10 kΩ, CEXT = 100 nF yields ~450 μs).
Each channel features Schmitt-trigger action on nA/nB inputs (not nRD), enabling robust operation with slow-rising/falling signals; clamp diodes allow overvoltage-tolerant interfacing via current-limiting resistors; and the reset path guarantees deterministic output termination regardless of ongoing retrigger activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 6.0 V - supports mixed-voltage system integration and battery-powered logic interfaces. |
| Operating Temperature | -40 °C to +125 °C - qualified for automotive under-hood and industrial control environments. |
| Pulse Width Range | 75 ns to >1 ms - determined by external REXT (2–1000 kΩ) and CEXT (0 pF to >10 nF); enables both nanosecond-level timing and long-duration event gating. |
| Propagation Delay | 24 ns (VCC = 6.0 V) - ensures tight synchronization in high-speed digital state machines and debounce circuits. |
| Input Thresholds | VIH = 4.2 V, VIL = 1.8 V (VCC = 6.0 V) - CMOS-compatible thresholds prevent false triggering in noisy environments. |
| Output Drive | ±5.2 mA (VCC = 6.0 V) - sufficient to directly drive multiple 74HC-series inputs or small capacitive loads without buffering. |
| Power Dissipation | 80 μA typical ICC (VCC = 6.0 V, no switching) - ultra-low quiescent current ideal for power-constrained embedded timing functions. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, body width 4.4 mm, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Negative-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on HIGH-to-LOW transition; Schmitt-triggered for noise immunity. |
| 1B | Positive-edge triggered input (Channel 1) | Starts or extends Channel 1 output pulse on LOW-to-HIGH transition; Schmitt-triggered. |
| 1RD | Direct reset input (Channel 1) | Terminates Channel 1 output pulse immediately on LOW-going edge; no Schmitt action. |
| 1Q | Active LOW output (Channel 1) | Drives LOW during monostable period; complements 1Q; sinks up to 5.2 mA. |
| 2Q | Active LOW output (Channel 2) | Drives LOW during Channel 2 monostable period; complements 2Q; sinks up to 5.2 mA. |
| 2CEXT | External capacitor connection (Channel 2) | Connects timing capacitor CEXT2 to ground; must be externally grounded per layout recommendation. |
| 2REXT/CEXT | Shared resistor/capacitor node (Channel 2) | Joint connection point for REXT2 and CEXT2; sets base pulse width and retrigger sensitivity. |
| GND | Ground reference (Pin 8) | Primary 0 V reference for all internal circuitry and external timing components. |
| 2A | Negative-edge triggered input (Channel 2) | Starts or extends Channel 2 output pulse on HIGH-to-LOW transition; Schmitt-triggered. |
| 2B | Positive-edge triggered input (Channel 2) | Starts or extends Channel 2 output pulse on LOW-to-HIGH transition; Schmitt-triggered. |
| 2RD | Direct reset input (Channel 2) | Terminates Channel 2 output pulse immediately on LOW-going edge. |
| 2Q | Active HIGH output (Channel 2) | Drives HIGH during monostable period; complements 2Q; sources up to 5.2 mA. |
| 1Q | Active HIGH output (Channel 1) | Drives HIGH during monostable period; complements 1Q; sources up to 5.2 mA. |
| 1CEXT | External capacitor connection (Channel 1) | Connects timing capacitor CEXT1 to ground; must be externally grounded per layout recommendation. |
| 1REXT/CEXT | Shared resistor/capacitor node (Channel 1) | Joint connection point for REXT1 and CEXT1; sets base pulse width and retrigger sensitivity. |
| VCC | Supply voltage (Pin 16) | Provides power for both monostables; decoupling capacitor required near pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent retriggerable monostables | Enables concurrent, non-interfering timing functions-e.g., one channel for signal stretch, another for timeout monitoring. |
| Schmitt-trigger inputs on all A/B trigger pins | Accepts slow or noisy edges (Δt/ΔV down to 83 ns/V at VCC = 6.0 V) without false triggering or metastability. |
| Direct active-low reset per channel | Guarantees immediate output termination regardless of retrigger state-critical for safety-critical pulse abort. |
| Wide supply range (2.0 V to 6.0 V) | Interoperates across 3.3 V and 5 V logic families without level shifters; supports brown-out tolerant designs. |
| Clamp diode protected inputs | Allows safe interface to voltages exceeding VCC using series current-limiting resistors-simplifies mixed-supply interconnect. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Debouncing mechanical relay contacts and push-button switches in PLC I/O modules. IC Role / Device Role / Timing Role: Monostable channel 1 generates fixed 20 ms clean pulse upon contact closure; channel 2 provides watchdog timeout if button remains pressed beyond 500 ms. Use Value: Eliminates microcontroller polling overhead and prevents spurious interrupts caused by contact bounce or EMI-induced glitches. |
Use Scenario: Generating controlled turn-signal flash timing and hazard-light synchronization in vehicle lighting controllers. IC Role / Device Role / Timing Role: Channel 1 sets nominal 1 Hz blink period using REXT = 100 kΩ, CEXT = 10 nF; channel 2 extends pulse duration during hazard activation via retriggering. Use Value: Achieves precise, temperature-stable flash timing without software intervention or crystal oscillator dependency. |
| Medical Instrumentation | Test & Measurement Equipment |
|
Use Scenario: Creating calibrated delay windows for analog signal sampling gating in portable ECG front-ends. IC Role / Device Role / Timing Role: Channel 1 triggers ADC conversion window after lead-off detection; channel 2 resets acquisition if signal amplitude exceeds threshold mid-window. Use Value: Ensures consistent sampling aperture and automatic fault recovery-meets IEC 60601-1 timing accuracy requirements. |
Use Scenario: Implementing programmable pulse-width modulation for laser diode driver enable control in optical test fixtures. IC Role / Device Role / Timing Role: Channel 1 generates 100 μs ON pulse (REXT = 10 kΩ, CEXT = 10 nF); channel 2 re-triggers to extend pulse up to 1 ms based on feedback loop response. Use Value: Enables real-time, hardware-based pulse shaping without FPGA or microcontroller latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT123PW,112 | TTL-compatible inputs (VIH = 2.0 V min), identical pinout and timing behavior; slightly higher ICC at VCC = 5 V. | Better suited for legacy 5 V TTL systems with marginal noise margins; same retrigger/reset functionality. | Select when interfacing with older 74LS/74ALS logic families where HC-level VIH may be unreliable. |
| SN74LV123APWR | Lower VCC range (1.65–5.5 V), LV logic family; propagation delay ~28 ns at 3.3 V; no clamp diodes on inputs. | Optimized for 3.3 V-only systems; lacks overvoltage tolerance-requires external protection if interfacing to >VCC signals. | Choose for cost-sensitive, single-rail 3.3 V designs where input overvoltage is not expected. |
Compared with 74HC123PW,112, the 74HCT123PW,112 offers guaranteed TTL input compatibility at 5 V but sacrifices some noise margin at lower VCC; the SN74LV123APWR reduces supply headroom and removes clamp diodes, trading robustness for lower voltage operation.
Availability
74HC123PW,112 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, medical instrumentation, and test & measurement equipment requiring stable component supply across extended temperature ranges.
Supply support for 74HC123PW,112 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 with focus on efficiency, reliability, and sustainability.
The 74HC123 belongs to Nexperia's standard logic portfolio, designed specifically for robust, low-power timing and waveform shaping in industrial, automotive, and medical applications demanding wide temperature operation and noise immunity.
FAQ
What is the minimum external timing capacitor value supported for stable operation?
The datasheet specifies stable operation with CEXT ≥ 0 pF, but recommends grounding pins 6 (2CEXT) and 14 (1CEXT) externally to GND for minimum noise. For reliable retriggering and pulse width predictability, CEXT ≥ 10 pF is advised-below this, parasitic capacitance (~7 pF at REXT/CEXT pins) dominates timing accuracy.
Can both monostable channels share the same REXT/CEXT network?
No-each channel requires its own dedicated REXT and CEXT components. Pins 15/14 (Channel 1) and 7/6 (Channel 2) are physically isolated; sharing would cause cross-channel interference and invalid pulse width calculation. The functional diagram and pin description confirm independent timing paths.
How does the reset input behave during an active retrigger sequence?
The nRD input has priority over all trigger inputs: a LOW-going edge on nRD terminates the current output pulse immediately-even if retriggering is actively extending it. This hard reset is asynchronous and overrides any ongoing monostable state, ensuring deterministic abort capability.
Is the TSSOP16 package (SOT403-1) RoHS compliant and halogen-free?
Yes-Nexperia confirms the 74HC123PW,112 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SOT403-1 package uses lead-free matte tin terminal finish and complies with JEDEC J-STD-020 moisture sensitivity level MSL3 (260 °C peak reflow).
74HC123PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 65 ns
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HC123PW,112 FAQ
1.How can I place an order for 74HC123PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC123PW,112 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 74HC123PW,112 reliable?
The price and inventory of 74HC123PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC123PW,112 is usually 5 days.
3.What payment methods are accepted for 74HC123PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC123PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC123PW,112?
74HC123PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC123PW,112 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 74HC123PW,112?
For technical support, including 74HC123PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC123PW,112 requirements.
6.How does Aetrix verify that 74HC123PW,112 is sourced from the original manufacturer or authorized distributors?
All 74HC123PW,112 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 74HC123PW,112 meets industry standards.
7.What is the process for return or replacement of 74HC123PW,112?
All 74HC123PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC123PW,112, 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 74HC123PW,112 part is unused and in its original packaging.
Return procedure for 74HC123PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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