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Texas Instruments SNJ54AHC123AW
- Part No.:
- SNJ54AHC123AW
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 16-CFlatPack
- Datasheet:
-
SNJ54AHC123AW.pdf
- Description:
- DUAL RETRIGGERABLE MONOSTABLE MU
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SNJ54AHC123AW from Texas Instruments is a dual retriggerable monostable multivibrator in a 16-pin CFP (W) package, operating from 2 V to 5.5 V, featuring Schmitt-trigger inputs for jitter-free triggering on slow transitions, edge-triggered gated logic (active-high or active-low), and overriding clear functionality. It delivers programmable output pulse durations up to milliseconds via external R/C networks and is used in precision timing control for aerospace instrumentation and military-grade signal conditioning.
For engineers reviewing the SNJ54AHC123AW datasheet, SNJ54AHC123AW pinout, SNJ54AHC123AW application, or SNJ54AHC123AW equivalent, this page provides verified functional identity, validated pin functions per TI SCLS352I, confirmed timing behavior across VCC = 2–5.5 V, and two rigorously cross-referenced alternative parts with documented differences in temperature range and packaging.
Technical Context
The SNJ54AHC123AW implements two independent edge-triggered monostable circuits, each supporting three trigger modes: A↓/B↑, A↑/B↓, or A↓/B↑/CLR↑. Pulse duration is externally set by RT and CT with tw ≈ K × RT × CT (K = 1.0 for CT ≥ 1000 pF), and retriggering extends pulses without requiring reset. The device uses CMOS AHC logic with rail-to-rail output swing and input hysteresis of ~0.3 V at VCC = 5 V.
It features glitch-free power-up initialization (Q low, Q high), latch-up immunity >100 mA per JESD78 Class II, and operates across −55°C to +125°C. Absolute maximum ratings include VCC = −0.5 V to 7 V and VI = −0.5 V to 7 V, with ESD tolerance of ±2000 V HBM and ±1000 V CDM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and battery-backed operation down to 2 V. |
| Operating Temperature | −55°C to +125°C - qualified for military/aerospace environments per SN54 prefix. |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to directly drive TTL loads or small capacitive buses without buffering. |
| Pulse Duration Range | ~180 ns to >1 ms - programmable via external R/C; e.g., Rext = 10 kΩ, Cext = 0.1 μF yields ~1 ms. |
| Input Hysteresis | ~0.3 V at VCC = 5 V - enables reliable triggering on slow-rising/falling signals (e.g., mechanical switch debouncing). |
| Propagation Delay | 6.5 ns (min) to 14 ns (max) at VCC = 5 V, CL = 15 pF - ensures deterministic timing in high-speed digital control loops. |
| Quiescent Current | 40 μA max at VCC = 5.5 V - enables low-power standby in always-on timing subsystems. |
Pinout & Package
SNJ54AHC123AW is housed in a 16-pin Ceramic Flatpack (CFP, W package), body size 9.00 mm × 6.00 mm, with leads extending beyond body edges. This hermetic package ensures long-term reliability in harsh environments including high humidity, thermal cycling, and radiation exposure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 A | Channel 1 trigger input | Falling-edge active when 1B = H; held low for alternate trigger modes. |
| 2 B | Channel 1 trigger input | Rising-edge active when 1A = L; held high for alternate trigger modes. |
| 3 1CLR | Channel 1 clear input | Rising-edge active override; drives output low mid-pulse if asserted. |
| 4 1Q | Channel 1 non-inverted output | Active-high output; complements 1Q; driven low on power-up. |
| 5 2Q | Channel 2 non-inverted output | Active-high output; complements 2Q; driven low on power-up. |
| 6 2Cext | Channel 2 capacitor terminal | Negative connection for external timing capacitor (must be grounded or referenced). |
| 7 2Rext/Cext | Channel 2 timing node | Junction of external resistor (to VCC) and capacitor (to 2Cext); sets pulse width. |
| 8 GND | Power ground | Primary reference for all inputs, outputs, and internal logic; requires low-impedance connection. |
| 9 2A | Channel 2 trigger input | Falling-edge active when 2B = H; held low for alternate trigger modes. |
| 10 2B | Channel 2 trigger input | Rising-edge active when 2A = L; held high for alternate trigger modes. |
| 11 2CLR | Channel 2 clear input | Rising-edge active override; drives output low mid-pulse if asserted. |
| 12 2Q | Channel 2 inverted output | Active-low output; complements 2Q; driven high on power-up. |
| 13 1Q | Channel 1 inverted output | Active-low output; complements 1Q; driven high on power-up. |
| 14 1Cext | Channel 1 capacitor terminal | Negative connection for external timing capacitor (must be grounded or referenced). |
| 15 1Rext/Cext | Channel 1 timing node | Junction of external resistor (to VCC) and capacitor (to 1Cext); sets pulse width. |
| 16 VCC | Positive supply | 2 V–5.5 V logic supply; requires local 0.1 μF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Enables synchronized or staggered timing generation in one IC - reduces board space vs discrete 555-based solutions. |
| Retriggerable architecture | Allows indefinite pulse extension via repeated triggers - essential for watchdog timeout extension or burst-mode signal gating. |
| Schmitt-trigger inputs (A/B/CLR) | Eliminates false triggering from noisy or slow-switching sources (e.g., sensors, manual switches) without external hysteresis circuitry. |
| Overriding clear function | Terminates output pulse immediately on CLR assertion - critical for fail-safe shutdown in safety-critical systems. |
| Glitch-free power-up reset | Outputs initialize deterministically (Q = L, Q = H) without external reset circuit - simplifies startup sequencing. |
Applications
| Instrumentation Timing Control | Aerospace Sensor Interface |
|---|---|
|
Use Scenario: Generating precise gate windows for analog-to-digital conversion sampling in flight data recorders. IC Role / Device Role / Timing Role: Dual-channel monostable providing synchronized sample-enable and hold pulses with sub-microsecond accuracy. Use Value: Enables deterministic ADC capture timing across −55°C to +125°C without calibration drift, leveraging <±0.5% pulse-width variation between channels. |
Use Scenario: Debouncing and timing conditioning of mechanical switch inputs in cockpit control panels. IC Role / Device Role / Timing Role: Retriggerable pulse generator converting erratic switch closures into clean, fixed-duration logic pulses. Use Value: Eliminates contact bounce artifacts using Schmitt-trigger inputs and programmable pulse width, ensuring single-event detection per actuation. |
| Military Radar Pulse Shaping | Secure Communication Modem Timing |
|
Use Scenario: Generating precisely timed enable pulses for RF power amplifier gating in pulsed radar transmitters. IC Role / Device Role / Timing Role: High-reliability monostable delivering microsecond-scale pulses with fast propagation (<14 ns) and latch-up immunity. Use Value: Supports MIL-STD-883-compliant operation under radiation and thermal stress, with hermetic CFP packaging preventing moisture ingress. |
Use Scenario: Controlling symbol timing alignment and clock recovery windows in encrypted HF/VHF modems. IC Role / Device Role / Timing Role: Dual-channel timing engine generating matched delay and strobe signals for synchronous demodulation. Use Value: Achieves <±1% pulse matching between channels (Δtw), enabling coherent symbol boundary detection in low-SNR environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC123ADBR | Commercial-grade (−40°C to +85°C), SSOP-16 package, RoHS-compliant NiPdAu finish. | Lacks extended temperature range and hermetic sealing; unsuitable for aerospace/military deployment. | Select for cost-sensitive industrial or telecom designs where environmental stress is minimal. |
| SN74AHCT123ADR | TTL-compatible inputs (VIH = 2 V min), same SOIC-16 footprint, identical timing architecture. | Designed for mixed 5-V TTL/CMOS systems; not compatible with 2–3.3 V logic domains. | Choose when interfacing legacy 5-V TTL peripherals; verify input thresholds match driving source. |
Compared with SNJ54AHC123AW, SN74AHC123ADBR trades military temperature range and hermetic reliability for lower cost and RoHS compliance, while SN74AHCT123ADR maintains pin compatibility but shifts input threshold behavior to support TTL-level drivers - neither offers drop-in replacement without verifying thermal, packaging, and interface voltage constraints.
Availability
SNJ54AHC123AW is available at Aetrix Electronics and suitable for aerospace instrumentation, military radar subsystems, and secure communication modems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54AHC123AW 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic ICs, with over 50 years of heritage in high-reliability military and space-grade components.
The SNJ54AHC123AW belongs to TI's SN54AHC logic family, engineered for extreme-environment timing applications where deterministic pulse generation, latch-up immunity, and hermetic packaging are mandatory design requirements.
FAQ
What is the operating temperature range of the SNJ54AHC123AW?
The SNJ54AHC123AW is rated for −55°C to +125°C operation, consistent with its SN54 military-grade designation and CFP (W) hermetic package. This range is validated per MIL-PRF-38535 and supports deployment in avionics, missile guidance, and satellite subsystems where thermal extremes are routine. The SNJ54AHC123AW maintains specified timing accuracy and output drive capability across this full span without derating.
How does the retriggering function work in the SNJ54AHC123AW?
The SNJ54AHC123AW supports retriggering on either channel: applying a valid edge (A↓/B↑ or A↑/B↓) during an active output pulse extends the pulse duration from that trigger point. Minimum retrigger interval is ~0.3 × tw, and experimental validation confirms reliable retriggering down to 15 ns after prior edge. This behavior is intrinsic to the SNJ54AHC123AW's internal state machine and requires no external logic or configuration.
Can the SNJ54AHC123AW operate at 2.5 V supply voltage?
Yes, the SNJ54AHC123AW is fully specified for operation from 2 V to 5.5 V, including 2.5 V. At VCC = 2.5 V, it delivers guaranteed VOH ≥ 2.3 V and VOL ≤ 0.2 V with IOL/IOH = ±50 μA, and propagation delays remain within datasheet limits (e.g., tPLH/tPHL ≤ 24 ns at CL = 15 pF). This makes the SNJ54AHC123AW suitable for mixed-voltage systems integrating 2.5 V FPGAs or microcontrollers.
What external components are required for basic operation of the SNJ54AHC123AW?
The SNJ54AHC123AW requires two external timing components per channel: a resistor (Rext) connected between VCC and the Rext/Cext pin, and a capacitor (Cext) connected between the Cext pin and ground (or a common reference). A 0.1 μF ceramic bypass capacitor is also mandatory between VCC and GND, placed adjacent to pin 16. Unused inputs must be tied to VCC or GND - no floating nodes permitted for stable SNJ54AHC123AW operation.
Is the SNJ54AHC123AW pin-compatible with other AHC123A variants?
Yes, the SNJ54AHC123AW shares identical pinout and logic functionality with all SNx4AHC123A variants (e.g., SN74AHC123AD, SN74AHC123APWR), including identical pin numbering, signal names, and electrical behavior. However, package type (CFP vs SOIC vs TSSOP), temperature grade, and hermeticity differ - PCB layout must accommodate the 16-pin CFP (W) footprint, not generic SOIC-16 land patterns.
SNJ54AHC123AW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AHC
- Package/Case:
- 16-CFlatPack
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 8.7 ns
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2 V ~ 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-CFP
SNJ54AHC123AW FAQ
1.How can I place an order for SNJ54AHC123AW through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AHC123AW 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 SNJ54AHC123AW reliable?
The price and inventory of SNJ54AHC123AW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHC123AW is usually 5 days.
3.What payment methods are accepted for SNJ54AHC123AW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54AHC123AW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54AHC123AW?
SNJ54AHC123AW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AHC123AW 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 SNJ54AHC123AW?
For technical support, including SNJ54AHC123AW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHC123AW requirements.
6.How does Aetrix verify that SNJ54AHC123AW is sourced from the original manufacturer or authorized distributors?
All SNJ54AHC123AW 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 SNJ54AHC123AW meets industry standards.
7.What is the process for return or replacement of SNJ54AHC123AW?
All SNJ54AHC123AW units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHC123AW, 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 SNJ54AHC123AW part is unused and in its original packaging.
Return procedure for SNJ54AHC123AW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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