HP TPN-LA31 100W USB-C Power Adapter — Fast PD Charging for HP Laptops

The HP TPN-LA31 is a 100W USB-C AC power adapter built for HP laptops that charge via USB Power Delivery. It delivers up to 20V⎓5A through a single USB-C port, automatically negotiating the correct voltage and current for your device. If you're replacing a lost, damaged, or aging HP 100W USB-C charger on a Spectre x360, ZBook Firefly, Envy, EliteBook, or Pavilion Plus, this adapter is the direct-fit replacement.

Unlike older HP barrel-style adapters with blue-tip plugs, this adapter uses a standard USB-C connector and supports USB PD 3.0 — which means it can also charge compatible phones, tablets, and accessories at lower power levels. It does not work with HP laptops that have a round DC barrel jack.

Key Specifications

How to Confirm This Adapter Is Right for Your Laptop

Before ordering, check three things on your original adapter or laptop:

1. Connector type. This adapter uses USB-C. If your laptop has a round DC barrel jack (4.5mm or 7.4mm), this adapter will not fit. You need a barrel-style adapter instead.
2. Wattage requirement. This adapter provides 100W. It will safely power laptops that require 100W or less — including 45W, 65W, and 90W USB-C models. It will not provide enough power for laptops that require more than 100W (such as the HP ZBook Studio or Fury with 150W+ requirements).
3. 3Spare part number match. This adapter replaces the following HP part numbers (all are the same 100W USB-C specification, differing only by manufacturing batch or region): PN-LA31 | N57041-001 | N56858-001 | N56858-002 | N56858-011 | PA-1101-08HT

If your original adapter's label shows any of these numbers, this is a direct replacement.

Compatible Laptop Series

This adapter is designed for HP laptops that use USB-C charging at 100W or below. The following series include models that are compatible — but always verify your specific model's power requirement before purchasing:

• HP Spectre series (USB-C models): Spectre x360 14, Spectre x360 16, Spectre Fold 17, and other Spectre models with USB-C charging. Most Spectre models require 65W or 100W and are fully compatible.
• HP Envy series (USB-C models): Envy 16, Envy 17, Envy x360 15, and Envy x360 16 models with USB-C charging. Note: some Envy configurations ship with 65W adapters; this 100W adapter is compatible and provides additional charging headroom.
• HP EliteBook series (USB-C models): EliteBook 800 and 1000 series G9 and later, EliteBook 600 series G9+, and other EliteBook models equipped with USB-C PD charging. Entry-level EliteBook models that use 45W or 65W are also compatible — the laptop will draw only the power it needs.
• HP ProBook series (USB-C models): ProBook 400 series G9 and later with USB-C PD support. Earlier ProBook models with barrel connectors are not compatible.
• HP ZBook Firefly series: ZBook Firefly 14 G9/G10/G11, ZBook Firefly 16 G9/G10/G11. These mobile workstation models typically ship with 100W USB-C adapters and are fully supported.
• HP Pavilion Plus series (USB-C models): Pavilion Plus 14, Pavilion Plus 16, and other Pavilion Plus models with USB-C PD charging.
• HP OmniBook series: OmniBook X, OmniBook 7, and other OmniBook models with USB-C charging.

Important: This adapter only works with HP laptops that have a USB-C port with Power Delivery support. If your laptop's USB-C port does not support charging, or if the laptop uses a barrel-style DC jack, this adapter is not compatible. When in doubt, check your laptop's specifications on HP's support website or look at the connector on your original adapter.

What's in the Box

The adapter includes a detachable AC power cord (C5 connector) and a fixed USB-C output cable. The USB-C cable length is approximately 1.8 meters (6 feet), providing enough reach for most desk and bedside setups. The AC cord uses a standard C5 ("Mickey Mouse") connector — if you need a different wall plug for international travel, you only need a plug adapter, not a voltage converter.

Cross-Device Charging

Because this adapter uses the USB Power Delivery standard, it can also charge compatible non-HP devices at lower power levels. USB-C PD phones (iPhone 15/16 series, Samsung Galaxy S series, Google Pixel), tablets (iPad Pro, iPad Air with USB-C), and accessories (wireless earbuds, power banks) can all be charged safely. The adapter automatically negotiates the correct voltage — 5V for small accessories, 9V or 15V for phones and tablets, and 20V for laptops.

Note: This is a single-port adapter. You can only charge one device at a time. If you need to charge a laptop and a phone simultaneously, consider a multi-port GaN charger instead.

100W vs 65W USB-C: Can You Mix Them?

If your laptop originally shipped with a 65W USB-C adapter, using this 100W adapter is safe and beneficial — the laptop will only draw the power it needs, and the adapter will run cooler with more headroom. Charging speed may be slightly faster when the laptop is under heavy load.

If your laptop originally shipped with a 100W adapter, using a 65W adapter is not recommended. The laptop may charge slowly, may not charge at all under load, or may display a "low power charger" warning. In some cases, the battery may drain while plugged in if the laptop's power draw exceeds 65W.

Frequently Asked Questions

Will this adapter work with my old HP laptop that has a round barrel plug?

No. This adapter uses USB-C. HP laptops with round barrel DC jacks (4.5mm blue tip or 7.4mm) require a barrel-style adapter. The physical connector is different, and no adapter or converter will make this work. If your laptop has a barrel jack, you need a barrel-style HP adapter with the correct wattage and tip color.

Can I use this adapter with a USB-C hub or docking station?

This adapter is designed to charge a laptop directly. It is not intended to power a USB-C docking station. Most HP docking stations require their own power adapter — typically 120W or higher with a barrel connector. Connecting this adapter to a dock's USB-C input may not deliver enough power and could cause unreliable operation.

Does this adapter get hot during use?

Warm is normal. A 100W adapter converting AC to DC generates heat as a byproduct, and it will feel warm to the touch during extended use — especially when charging a laptop under heavy load. The adapter should not be painfully hot. If it becomes uncomfortably hot, ensure it has ventilation around it and is not buried under papers or fabric.

Can I charge my phone and laptop at the same time?

No. This adapter has a single USB-C port. You can only charge one device at a time. If you need to charge multiple devices simultaneously, consider a multi-port USB-C charger or a separate charger for your phone.

Is the USB-C cable detachable?

The USB-C cable is fixed to the adapter body and cannot be removed. If the cable becomes damaged, the entire adapter needs to be replaced. To extend cable life, avoid wrapping the cable tightly around the adapter body and always grip the plug — not the cable — when unplugging.

What's the difference between this and the newer HP 100W GaN adapter?

The newer HP 100W GaN adapter (CS9V7UT) uses gallium nitride technology to achieve a smaller, lighter physical design. Electrically, both deliver 100W via USB-C PD. The TPN-LA31 is the standard design used in earlier HP 100W USB-C charging platforms. Both are interchangeable for the same laptops — the choice comes down to size preference and availability.

Will this adapter work with non-HP laptops?

Yes, as long as the laptop supports USB-C Power Delivery charging at 100W or below. This includes many Dell XPS, Lenovo ThinkPad, Apple MacBook Air/Pro, and other USB-C PD laptops. However, some laptops use proprietary charging extensions above 100W that may not be supported. Check your laptop's USB-C PD compatibility before using this adapter with a non-HP device.

My laptop charges but I see a "slow charger" warning. What's wrong?

This warning typically appears when the laptop requires more power than the adapter can deliver. Possible causes: your laptop requires more than 100W (check the original adapter's wattage), the USB-C cable is damaged or not fully seated, or the adapter is connected through a hub or dock that limits power delivery. Try connecting the adapter directly to the laptop without any intermediate devices.

The HP TPN-LA31 is a 100W USB-C Power Delivery AC adapter designed for compatible HP notebooks and USB-C devices. Supporting up to 20V 5A output, it provides intelligent fast charging for HP EliteBook, ProBook, ZBook, Spectre, Envy, and Pavilion series while replacing compatible HP 100W USB-C power adapters with matching specifications.

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