Alternatives to onsemi MM74HC688WMX
onsemi MM74HC688WMX and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 MM74HC688WMXonsemi |  SN74HC688DWRTexas Instruments |  74HC688D,653Nexperia USA Inc. | +1more | |
|---|---|---|---|---|
| FFF Compatibility | The pinout assignments and 20-SOIC footprint match the original MM74HC688WMX exactly, allowing for a direct physical drop-in without any PCB changes.Both parts are housed in a 20-SOIC package (0.295 inch / 7.50mm wide body) with equivalent mechanical dimensions and surface-mount style.The electrical characteristics, including the 2V to 6V operating supply voltage range and 8-bit identity comparison logic, fully align with the original part. | The pin assignments and SO20 package layout are completely identical to the original onsemi device.Housed in a standard 20-pin SOIC (7.50mm body width) package compatible with the original footprint.Maintains identical 8-bit active-low identity comparator function with matching 2V to 6V supply voltage capabilities. | ||
 AI Summary | MM74HC688WMX by onsemi: Magnitude Comparator Bit Active Low Output A=B 20-SOIC. | The SN74HC688DWR is a highly reliable direct second-source drop-in replacement from Texas Instruments. It is in an active lifecycle stage and offers identical 8-bit comparator functionality, package layout, and electrical specifications.
| The Nexperia 74HC688D,653 is an active, high-performance drop-in alternative. It extends the operating temperature range up to +125°C and features slightly improved timing characteristics while matching the original's package and pinout.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Magnitude Comparator Bit Active Low Output A=B 20-SOIC | Magnitude Comparator Bit Active Low Output A=B 20-SOIC | Magnitude Comparator Bit Active Low Output A=B 20-SO | |
| Manufacturer | onsemi | Texas Instruments | Nexperia USA Inc. | |
| Type | Logic | Logic | Logic | |
| Datasheet | Open | Open | Open | |
| Lead Time | 18 weeks | 9 weeks | 22 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8542.39.0090 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Type | Identity Comparator | - | - | |
| Output | Active Low | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Number of Bits | 8 | - | - | |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | - | - | |
| Output Function | A=B | - | - | |
| Voltage - Supply | 2V ~ 6V | - | - | |
| Operating Temperature | -40°C ~ 85°C | - | - |
Unlock all 3 alternatives
- Find & compare verified second sources
- Spot risk early with real-time part monitoring
- Stay compliant and production-ready
Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 MM74HC4051MXonsemi | Non-stock | Obsolete | 3Alternatives availableSee Alternatives |
 MM74HCT244WMonsemi | In stock | Obsolete | 5Alternatives availableSee Alternatives |
 MM74HCT573WMonsemi | In stock | Obsolete | 5Alternatives availableSee Alternatives |
 MM74HC04Nonsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
You searched one part. Parter watches your whole BOM.
All your BOM, at once
Parter maps every line to live stock, lead time, lifecycle and compliance data across the entire market — not part by part.
Hear about problems before they hit production
Allocation, EOL and last-time-buy notices surface the moment they appear, not when your buyer's PO bounces.
Qualified replacements in minutes, not days
Every at-risk line gets form-fit-function matches like the ones above — deltas flagged, evidence attached. Review, push to your BOM, and Parter starts watching the new part too.
Frequently asked questions
Yes. The onsemi MM74HC688WMX is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the onsemi MM74HC688WMX are the SN74HC688DWR (Texas Instruments) and the 74HC688D,653 (Nexperia USA Inc.), out of 3 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the MM74HC688WMX are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The MM74HC688WMX (onsemi) is a part in the Logic category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
Schedule a demo
See Parter in action
Discover how Parter can help your hardware team:
- Streamline your hardware operations with AI
- Detect and prevent lifecycle disruptions
- Accelerate product development
- Stay compliant and production-ready