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Compatibility Guide

HP 45 / 51645A Compatible Desktop Printers

The HP 45 / 51645A black ink cartridge was originally developed for selected desktop inkjet printers before the same cartridge platform became widely adopted in garment CAD plotting systems.

Today, garment CAD printing remains the primary focus of 45inkcartridge.com. This page is provided for users who still operate legacy desktop printers using the HP 45 / 51645A cartridge.

Looking for an HP 45 Cartridge?

If your printer uses HP 45 / 51645A black ink, this is the cartridge family you are looking for.

  • Cartridge Family: HP 45
  • Reference Number: 51645A
  • Color: Black
  • Printing Technology: Thermal Inkjet
View Desktop Cartridge Details

Stays on this page. See the dedicated desktop replacement cartridge section below.

What is HP 45 / 51645A?

A quick overview of the HP 45 platform and its role across desktop and industrial printing.

HP 45 is a black thermal inkjet cartridge commonly identified by the cartridge reference 51645A. It combines the ink reservoir and thermal printhead in one cartridge platform.

The cartridge was widely used in earlier generations of desktop and office inkjet printers. Its integrated printhead architecture was later adopted in many garment CAD plotters and other industrial printing systems.

HP 45 / 51645A at a Glance

Cartridge family HP 45
Reference 51645A
Color Black
Ink Pigment (black pigment ink)
Technology Thermal Inkjet
Capacity Approx. 42 ml
Legacy application Desktop inkjet printers (legacy HP DeskJet models)
Current primary application on this website Garment CAD Plotters

Is HP 45 the same as 51645A?

Yes. 51645A is the manufacturer part number for the HP 45 black ink cartridge, so “HP 45” and “51645A” refer to the same thermal inkjet cartridge platform — the two names are used interchangeably in printer manuals, parts lists and supplier catalogs.

Our 45A ink cartridge range is built on this same HP 45 / 51645A platform, which is why the terms HP 45, 51645A and 45A ink cartridge appear together throughout this website.

Which printers use HP 45?

The HP 45 / 51645A black pigment ink cartridge was originally used in selected legacy HP DeskJet desktop printers — including the 900-series and wide-format models listed below — and today it is used mainly in garment CAD plotters. Search or browse the models below, then check the full compatibility table.

HP DeskJet — 700 Series (0 confirmed models)

A small number of legacy DeskJet 700 series printers were released with HP 45 / 51645A cartridges in some regional configurations. Contact us with your exact printer model to confirm compatibility before ordering.

  • No models listed in this series.
HP DeskJet — 800 Series (0 confirmed models)

A small number of legacy DeskJet 800 series printers were released with HP 45 / 51645A cartridges in some regional configurations. Contact us with your exact printer model to confirm compatibility before ordering.

  • No models listed in this series.
HP DeskJet — 900 Series (3 commonly searched models)

The DeskJet 900 series is the most commonly searched family on this page. Compatibility below is shown only for the models we have explicitly confirmed against customer reference.

  • HP DeskJet 930c Black Cartridge: HP 45 / 51645A
    Commonly Searched
  • HP DeskJet 950c Black Cartridge: HP 45 / 51645A
    Commonly Searched
  • HP DeskJet 970c Black Cartridge: HP 45 / 51645A
    Commonly Searched
HP DeskJet — Wide Format & Business (3 commonly searched models)

These are larger-format DeskJet models that commonly used the HP 45 / 51645A cartridge. Compatibility below is shown only for the models we have explicitly confirmed against customer reference.

  • HP DeskJet 1220c Black Cartridge: HP 45 / 51645A
    Commonly Searched
  • HP DeskJet 1280 Black Cartridge: HP 45 / 51645A
    Commonly Searched
  • HP DeskJet 9300 Black Cartridge: HP 45 / 51645A
    Commonly Searched

Other families (OfficeJet, Photosmart, Fax / Copier) are reserved for future publication once compatibility has been verified. We do not publish unverified model claims.

HP 45 / 51645A Printer Compatibility Table

Legacy HP DeskJet printer families and models associated with the HP 45 / 51645A black ink cartridge. Selected HP45 / 45A cartridge-based models may apply; model confirmation is required before ordering.
Printer Family Model Black Cartridge Reference Status
HP DeskJet — 700 Series Selected regional models HP 45 / 51645A Model confirmation required
HP DeskJet — 800 Series Selected regional models HP 45 / 51645A Model confirmation required
HP DeskJet — 900 Series HP DeskJet 930c HP 45 / 51645A Commonly searched
HP DeskJet — 900 Series HP DeskJet 950c HP 45 / 51645A Commonly searched
HP DeskJet — 900 Series HP DeskJet 970c HP 45 / 51645A Commonly searched
HP DeskJet — Wide Format & Business HP DeskJet 1220c HP 45 / 51645A Commonly searched
HP DeskJet — Wide Format & Business HP DeskJet 1280 HP 45 / 51645A Commonly searched
HP DeskJet — Wide Format & Business HP DeskJet 9300 HP 45 / 51645A Commonly searched

The table above is fully crawlable HTML. The same information is repeated in the searchable list above it — the search filter requires JavaScript, but the compatibility table itself does not.

Does HP DeskJet 1220c use HP 45?

Yes — selected HP DeskJet 1220c configurations use the HP 45 / 51645A black cartridge, so an HP 45 replacement cartridge (also sold as a 45A ink cartridge) fits those units. Because configurations varied by regional version, send us your exact printer model to confirm before ordering.

Commonly Searched Models

The legacy HP DeskJet models users most frequently search when looking for an HP 45 / 51645A replacement.

HP 45 / 51645 Replacement Cartridge for Desktop Printers

Designed as a replacement cartridge for selected legacy desktop printers using the HP 45 / 51645 cartridge platform.

Compatibility should be confirmed by printer model before ordering.

  • Cartridge Family: HP 45
  • Replacement Reference: 51645
  • Color: Black
  • Ink Type: Pigment Ink
  • Capacity: Approx. 42 ml
  • Application: Compatible Legacy Desktop Printers
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Compatibility Notice

Printer compatibility can vary by model, regional version and cartridge configuration. If you are unsure whether your printer uses HP 45 / 51645A, please contact us with the printer model before ordering.

Ask About Compatibility

Why is the HP 45 Cartridge Platform Still Used?

Four reasons this legacy cartridge architecture has remained relevant across multiple generations of printing equipment.

Integrated Printhead

The thermal printhead is integrated directly into the cartridge.

Proven Cartridge Architecture

The HP 45 platform has been used across multiple generations of printing equipment.

Black Pigment Printing

Designed for clear black text, lines and technical printing applications.

Industrial Adoption

The same cartridge architecture later became widely used in garment CAD plotting systems.

Can HP 45 cartridges be used in garment CAD plotters?

Yes — the HP 45 / 51645A cartridge platform is widely used in garment CAD plotters, and garment CAD printing is the primary application supported by 45inkcartridge.com.

Explore our 45A cartridge grades, compatible garment plotters and application guidance for pattern and marker printing.

Explore 45A Cartridges for Garment CAD Explore Compatible Plotters

Frequently Asked Questions

Concise answers about HP 45 / 51645A, legacy printer compatibility, and our 45A replacement range.

Yes. 51645A is the HP part number that identifies the HP 45 black ink cartridge family. The two names refer to the same cartridge platform.

HP 45 was originally used in selected legacy desktop inkjet printers, including several HP DeskJet 900-series and wide-format DeskJet models. The same cartridge platform was later widely adopted in garment CAD plotters and other industrial marking systems.

Use the “Find Your Printer” section above to check the most commonly searched models.

Yes. HP 45 / 51645A is a black pigment ink cartridge with an integrated thermal printhead, designed for clear text, fine lines, and technical printing.

Selected HP DeskJet 1220c configurations use the HP 45 / 51645A black cartridge. Because compatibility can vary by regional version, please send us your printer model before ordering.

Yes. Garment CAD plotting is the primary application supported by 45inkcartridge.com. Our 45A A Plus, Grade A, and Regular cartridges are designed for this same HP 45 / 51645A platform. See the compatible garment plotters list on the homepage.

Yes. Replacement cartridges for the HP 45 / 51645A platform are available through our 45A Ink Cartridge range on the homepage. Confirm your printer model first; we will recommend the correct 45A grade for your application.

Related Knowledge

Background reading on how the HP 45 platform evolved from desktop printing into garment CAD applications.

ARTICLE — RESERVED

From HP DeskJet to Garment CAD: The Evolution of the HP 45 Ink Cartridge

A short history of how the HP 45 / 51645A platform moved from early desktop inkjet printers into industrial garment CAD plotting systems.

Coming soon — Knowledge Center
ARTICLE — RESERVED

What Printers Use HP 45 / 51645A Ink Cartridges?

A practical reference covering legacy printer families that used the HP 45 / 51645A black cartridge, plus guidance on verifying compatibility.

Coming soon — Knowledge Center

Continue on 45inkcartridge.com

Explore the rest of the Wecare 45A resources — every link below returns you to the main garment CAD focus.

PRODUCTS 45A Ink Cartridge Browse A Plus, Grade A, and Regular 45A grades for garment CAD plotters. COMPATIBILITY Compatible Plotters & Cutters See garment CAD plotters and cutting systems that use the HP 45 / 51645A cartridge. APPLICATIONS Garment CAD Applications Pattern plotting, marker printing, technical drawing, and CAD room workflows. RESOURCES Knowledge Center Practical guides on HP45, 45A ink cartridges, garment CAD printing, and maintenance. CONTACT Contact & Inquiry Email, Tel, or WhatsApp our sales team for compatibility and ordering support.