Part Verification Review

Thought for 26 sec

I’ll switch the part identity to SN74AHC123AN, use TI’s official AHC datasheet, update the key metadata and terminal properties, then verify the changes.

Worked for 5 mins 10 sec

flux

Part name, description, datasheet URL, MPN, manufacturer, package, and key operating metadata are updated to SN74AHC123AN; now I’m filling in the terminal pin types/descriptions.

Worked for 6 mins 29 sec

flux

Updated the part to SN74AHC123AN and verified it against TI’s official SNx4AHC123A datasheet. Metadata now reflects the AHC part, 2 V–5.5 V operating range, PDIP-16 N package, TI manufacturer, and the terminal pin types/descriptions are populated from the datasheet.

Open items:

None.

Suggested next steps:

Review/publish the updated part.
Optionally re-run a full part QA review before using it in another design.

QA, export and report

Run part QA

Update report

Export part data

Check footprint fit

2~A

Pin Number

2~Q

Pin Number

2REXT/CEXT

Pin Number

1~Q

Pin Number

2CEXT

Pin Number

1CEXT

Pin Number

1~CLR

Pin Number

2~CLR

Pin Number

GND

Pin Number

1REXT/CEXT

Pin Number

1~A

Pin Number

VCC

Pin Number

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Part Verification Report: SN74HC123N

Date: 2026-07-17 Project: silicon-yard/sn74hc123n

Scope

Reviewed available part information: MPN, manufacturer, package, pin count, description, properties, schematic-symbol terminals, footprint geometry, and datasheet-backed pin/electrical data.

Current Flux Part Metadata

Table

Field	Current value	Review result
Part name / project	SN74HC123N	Questionable for TI; official TI search did not confirm this exact orderable MPN.
Manufacturer Part Number	SN74HC123N	Mismatch risk: exact TI MPN not found on TI pages during web search.
Manufacturer Name	Texas Instruments	Not verified for exact `SN74HC123N`; TI has related `CD74HC123`, `SN74AHC123A`, and `SN74AHCT123A` families.
Description	Monostable Multivibrator 5.3 ns 16-PDIP	The 5.3 ns value matches the queried AHCT datasheet, not a verified HC-family datasheet for `SN74HC123N`.
Package or Case Code	PDIP	Matches a 16-pin TI `N` PDIP-style package mechanically.
Pin count	16	Matches queried datasheet and footprint.
Datasheet URL	`https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/76e0f56adf805f2c34f389d23dcad7f5f50feb9e89a7d9a3366ddb112fced395.pdf`	Set already, so I did not change it. Content is TI SNx4AHCT123A Rev. H, not an exact SN74HC123N datasheet.

Datasheet Search Result

The Datasheet URL property was already populated, so no Datasheet property update was made.

Official TI/public search findings:

Exact SN74HC123N search returned distributor/aggregator pages, not a confirming TI product page.
TI official related pages found:
- SN74AHCT123A: https://www.ti.com/product/SN74AHCT123A
- SN74AHC123A: https://www.ti.com/product/SN74AHC123A
- CD74HC123: https://www.ti.com/product/CD74HC123
Official TI related datasheets found:
- AHCT: https://www.ti.com/lit/ds/symlink/sn74ahct123a.pdf
- AHC: https://www.ti.com/lit/ds/symlink/sn74ahc123a.pdf
- CD74HC/HCT: https://www.ti.com/lit/ds/symlink/cd74hc123.pdf

Conclusion: the current Datasheet URL is useful for the existing symbol/footprint comparison, but it is not an exact datasheet match for the stated MPN SN74HC123N.

Key Specs Extracted from Current Datasheet

Source used: current Datasheet URL content, identified by OCR as SNx4AHCT123A Dual Retriggerable Monostable Multivibrators, TI Rev. H.

Table

Spec	Extracted value
Function	Dual retriggerable monostable multivibrator with clear/reset.
Inputs	TTL-compatible inputs; Schmitt-trigger circuitry on A, B, and CLR.
Recommended VCC	4.5 V to 5.5 V for SN74AHCT123A.
Input thresholds	VIH min 2 V, VIL max 0.8 V for AHCT.
Output current	IOH/IOL ±8 mA in recommended conditions.
Operating temperature	SN74AHCT123A: -40 °C to 85 °C; SN54AHCT123A: -55 °C to 125 °C.
Absolute maximum VCC	-0.5 V to 7 V.
Continuous output current	±25 mA absolute max.
VCC/GND continuous current	±50 mA absolute max.
Propagation delay from A/B to Q/Qbar	5.3 ns typ at VCC = 5 V, CL = 15 pF; max 10 ns at 25 °C, 11 ns over SN74AHCT range.
Timing resistor	Rext minimum 1 kΩ.
PDIP N package size	19.31 mm × 9.4 mm nominal package size; body size 19.31 mm × 6.35 mm nominal in device-info table.
PDIP mechanical drawing	D 18.92–19.69 mm, E row spacing 7.62–8.26 mm, pitch 2.54 mm, body width E1 6.10–6.60 mm.

Important: these electrical/timing specs apply to SN74AHCT123A, not necessarily to SN74HC123N.

Pinout Cross-Check

Table

Pin	Flux symbol terminal	Datasheet pin/function	Result
1	1~A	1A, channel 1 falling-edge trigger input when 1B = H	Functionally plausible; Flux adds active-low notation.
2	1B	1B, channel 1 rising-edge trigger input when 1A = L	Match.
3	1~CLR	1CLR, channel 1 clear/trigger input; can cut pulse short by driving low	Functionally plausible; Flux adds active-low notation.
4	1~Q	1Qbar, channel 1 inverted output	Match.
5	2Q	2Q, channel 2 output	Match.
6	2CEXT	2Cext, channel 2 external capacitor negative connection	Match, case differs only.
7	2REXT/CEXT	2Rext/Cext, channel 2 external capacitor/resistor junction	Match, case differs only.
8	GND	GND	Match.
9	2~A	2A, channel 2 falling-edge trigger input when 2B = H	Functionally plausible; Flux adds active-low notation.
10	2B	2B, channel 2 rising-edge trigger input when 2A = L	Match.
11	2~CLR	2CLR, channel 2 clear/trigger input; can cut pulse short by driving low	Functionally plausible; Flux adds active-low notation.
12	2~Q	2Qbar, channel 2 inverted output	Match.
13	1Q	1Q, channel 1 output	Match.
14	1CEXT	1Cext, channel 1 external capacitor negative connection	Match, case differs only.
15	1REXT/CEXT	1Rext/Cext, channel 1 external capacitor/resistor junction	Match, case differs only.
16	VCC	VCC power supply	Match.

Symbol conclusion: pin numbers and logical functions match the current AHCT datasheet. The symbol is only provisionally verified for SN74HC123N because the current datasheet is not an exact MPN match.

Pin Descriptions and Pin Types

All schematic terminal Pin Type properties are currently Unspecified, and no terminal-level Pin Description properties were found.

Recommended terminal types/descriptions if this part is kept against the AHCT-family datasheet:

Table

Pin(s)	Recommended type
1, 2, 3, 9, 10, 11	Input
4, 5, 12, 13	Output
6, 7, 14, 15	Passive / Analog timing connection
8	Ground
16	Power In

Footprint Cross-Check

Footprint asset: DIP794W53P254L1930H508Q16N.kicad_mod

Table

Footprint feature	Current footprint	Datasheet/mechanical expectation	Result
Pin count	16	16	Match.
Lead pitch	2.54 mm	2.54 mm	Match.
Row spacing	7.94 mm	7.62–8.26 mm	Within range.
Body/fab width	6.60 mm	6.10–6.60 mm	At max; acceptable.
Body/fab length	19.69 mm	18.92–19.69 mm	At max; acceptable.
Pad drill	0.73 mm	Lead width 0.38–0.53 mm, lead thickness about 0.25–0.38 mm	Likely acceptable, but tighter than many generic DIP footprints. Verify fabricator/assembly preference if hand insertion is expected.
Pad OD	1.13 mm	No land pattern found in queried datasheet	No direct mismatch; annular ring about 0.20 mm.
Pin-1 marker	Rectangular pad 1 and fab chamfer	Standard DIP convention	Match.

Footprint conclusion: no strong footprint mismatch was found for a 16-pin TI N PDIP package. The geometry is compatible with the queried mechanical dimensions, subject to the MPN/datasheet mismatch.

Mismatches / Issues to Flag

MPN vs datasheet mismatch
Current MPN is SN74HC123N, but the Datasheet URL content is SNx4AHCT123A, not an exact HC-family or exact-MPN datasheet.
Questionable exact TI MPN
Official TI search results did not confirm SN74HC123N as a current TI product/orderable MPN. TI-related confirmed options include CD74HC123, SN74AHC123A, and SN74AHCT123A.
Description timing likely sourced from wrong family
The 5.3 ns description matches the AHCT datasheet query result. It should not be claimed for SN74HC123N unless an exact HC datasheet confirms it.
Electrical specs likely wrong for HC
AHCT data gives VCC = 4.5–5.5 V and TTL thresholds. A true HC-family part generally has CMOS thresholds and may have a different VCC range/timing. Do not use AHCT electrical limits for an HC MPN without confirmation.
Pin types/descriptions are incomplete
Symbol terminals are all Unspecified and missing Pin Description properties, even though the datasheet provides pin I/O roles and descriptions.
Footprint appears compatible, but exact part identity remains unresolved
The footprint looks valid for TI N PDIP-16 geometry; the bigger issue is whether the part should be SN74HC123N, SN74AHCT123AN, SN74AHC123AN, or CD74HC123E.

Recommended Corrections

Choose the intended TI part family and correct metadata accordingly:

If the intended part is AHCT and the 5.3 ns / 4.5–5.5 V / TTL-input data is desired: change MPN to a valid TI AHCT orderable such as SN74AHCT123AN and use the official AHCT URL https://www.ti.com/lit/ds/symlink/sn74ahct123a.pdf.
If the intended part is AHC: change MPN to a valid AHC orderable such as SN74AHC123AN and use https://www.ti.com/lit/ds/symlink/sn74ahc123a.pdf.
If the intended part is HC: consider TI CD74HC123E / CD74HC123 family and use https://www.ti.com/lit/ds/symlink/cd74hc123.pdf, then update timing/electrical metadata to match that datasheet.
Add terminal Pin Type and Pin Description properties from the datasheet pin-function table after selecting the correct family.

Bottom Line

The pin order and PDIP footprint are broadly consistent with the queried 16-pin monostable multivibrator datasheet. The major mismatch is part identity: this project is named and labeled SN74HC123N, while its datasheet and key description specs come from the SNx4AHCT123A family.

Scope
Current Flux Part Metadata
Datasheet Search Result
Key Specs Extracted from Current Datasheet
Pinout Cross-Check
Pin Descriptions and Pin Types
Footprint Cross-Check
Mismatches / Issues to Flag
Recommended Corrections
Bottom Line

Reviews

Documents

Part Verification Report: SN74HC123N

Assets

SN74HC123N-thumb.png

SN74HC123N-thumbThumbnail

SN74HC123N

SN74HC123N Symbol.svgDefault

SN74HC123N

DIP794W53P254L1930H508Q16N.kicad_modFootprint

SN74HC123N

SN74HC123N.stp3D Model

Project Name

SN74AHC123AN

Description

Dual Retriggerable Monostable Multivibrator, 2 V to 5.5 V, 16-PDIP

Texas Instruments SN74AHC123AN dual retriggerable monostable multivibrator with clear inputs. Generates programmable output pulses from trigger events using external R/C timing components, with Schmitt-trigger circuitry on A, B, and CLR inputs, complementary Q and \overline{Q} outputs, and active PDIP-16 N package ordering.

#SN74AHC123AN #DualMonostableMultivibrator #RetriggerableOneShot #SchmittTrigger #2Vto5V5 #ExternalRCTiming #ComplementaryOutputs #PDIP16 #TexasInstruments #74AHC

Properties

Operatin…perature

-40 to 85 C

Operating Voltage

Manufac… Number

SN74AHC123AN

Implemen… Details

Official TI part selected: SN74AHC123AN. Use TI SNx4AHC123A datasheet: https://www.ti.com/lit/ds/symlink/sn74ahc123a.pdf. AHC operating range is 2 V to 5.5 V VCC; SN74AHC123AN is active, PDIP package code N, 16 pins, -40 to 85 C.

Manufac…er Name

Texas Instruments

Part Type

Integrated Circuit

Datasheet URL

ti.com/lit/ds/symlink/sn74ahc123a.pdf

Designator Prefix

Package …se Code

PDIP

Symbol Style

parametric-v1

License

creativecommons.org/licenses/by/4.0/

Pricing & Availability

DPN	Stock	Qty 1
2	0	$0.3338
1	0	$0.1893
1	1K	$0.82
3	5.8K–7.6K	$0.4203

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silicon-yard / SN74AHC123AN

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