PD-3501G/AC-US - 15.4W Gigabit PoE Midspan Injector | Microchip
MPN: PD-3501G/AC-US ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $89 | $89.00 |
| 10 | $84.55 | $845.50 |
| 100 | $79.2 | $7,920.00 |
| 500 | $74.75 | $37,375.00 |
| 1,000 | $71.2 | $71,200.00 |
PD-3501G/AC-US Overview
A PoE midspan injector (also called a PoE adapter or power injector) is a network device that adds DC power to an existing Ethernet data cable without altering the switches or cabling already installed. It sits in-line between a non-PoE network switch and a powered device (PD) such as an IP camera, injecting power on the spare pairs or center taps per the IEEE 802.3af standard. Within the power-over-Ethernet hierarchy, it belongs to the midspan (endpoint-independent) class of power sourcing equipment (PSE), as opposed to an endspan PoE switch.
Key features of the PD-3501G include full IEEE 802.3af compliance guaranteeing safe detection and classification of powered devices, Gigabit Ethernet pass-through so 1000BASE-T data rates are preserved, and plug-and-play installation that leaves the existing network infrastructure completely unaltered. The unit delivers a nominal 48V DC output at up to 0.32A (15.4W) from an AC mains input of up to 240V via an IEC 320-C14 inlet.
Technically, the midspan performs the PSE functions required by 802.3af: it applies a detection signature to identify a valid PD, optionally reads the classification signature, and only then applies the 48V power, protecting legacy non-PoE equipment from damage. Detection also enables hot-plugging of terminals without disrupting data traffic.
Typical applications include powering IP phones, WLAN access points, and network cameras in offices, campuses, and low-port-density installations where upgrading to a PoE switch is unnecessary or uneconomical.
For design-in and deployment, remember that the total cable run, including the midspan, must stay within the 100 m Ethernet channel limit, and the powered device must be 802.3af Class 0 through Class 4 compatible to fit within the 15.4W budget.
This page adds unique value beyond the manufacturer datasheet: it synthesizes distributor pricing tiers, drop-in cord-code and family alternatives, deployment design notes, and AEO-optimized FAQs in one place.
Drop-in alternatives for PD-3501G/AC-US — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PD-3501G/AC-TW
✅ Drop-In📋 Reference alternative (not in catalog)
PD-3501G/AC-EU
✅ Drop-In📋 Reference alternative (not in catalog)
PD-3501G/AC-UK
✅ Drop-In📋 Reference alternative (not in catalog)
PD-3501G/AC-JP
✅ Drop-In📋 Reference alternative (not in catalog)
PD-3501GO-ET/AC
✅ Drop-In📋 Reference alternative (not in catalog)
PD-3501/AC-US
✅ Drop-In📋 Reference alternative (not in catalog)
PD-3501G/AC-US Specifications (manufacturer-published)
| Product Type | Single-port PoE midspan injector (PSE) |
| PoE Standard | IEEE 802.3af compliant |
| Output Voltage | 48 V DC nominal |
| Output Current | 0.32 A |
| Output Power | 15.4 W |
| Number of PoE Ports | 1 |
| Data Rate | 10/100/1000 Mbps (Gigabit) |
| Ethernet Interface | RJ45 (data-in and data-and-power-out) |
| AC Input Connection | IEC 320-C14 inlet |
| Maximum Input Voltage | 240 V AC |
| Minimum Operating Temperature | 0 C |
| Mounting | Desktop (surface-mount: No) |
| Power Cord | US (North America) |
| Package Code | XMA (rectangular enclosure) |
| Typical Powered Devices | IP phones, WLAN access points, network cameras |
| Installation | Plug-and-play, no network reconfiguration |
PD-3501G/AC-US Interfaces & Connectors
PD-3501G/AC-US exposes the following interfaces and connectors as published by the manufacturer: Power Input, Ethernet. Expansion header pinout, connector pin numbering, and electrical limits are defined in the manufacturer documentation.
| Power Input | IEEE 802.3af compliant |
| Ethernet | RJ45 (data-in and data-and-power-out) |
Refer to the manufacturer documentation for the full expansion header pinout and connector pin numbering.
Power & Thermal Characteristics
| Power Input | IEEE 802.3af compliant |
| Operating Temperature | 0 C |
Power input and thermal parameters for PD-3501G/AC-US as published by the manufacturer.
Typical Applications
PD-3501G/AC-US is suitable for 6 applications: IP Phone Deployment, WLAN Access Point Powering, Network Camera Surveillance, Low-Port-Density Office Retrofit, Campus Telephony Infrastructure, IP Terminal Bench and Lab Powering.
IP Phone Deployment
The PD-3501G/AC-US is a natural fit for powering IP phones because enterprise phones are almost universally IEEE 802.3af Class 2 or Class 3 devices drawing well under the 15.4W budget. The midspan inserts between an existing non-PoE switch and the phone's wall jack, delivering 48V DC over the same Cat5e cable that carries 10/100/1000 Mbps voice data, so no switch upgrade or extra cabling is needed. Its 802.3af detection signature prevents 48V from ever reaching a legacy non-PoE phone or PC patched through the same desk, enabling safe hot-plugging. For open-plan offices with scattered single-phone additions, one midspan per phone is far cheaper than replacing a switch, and the Gigabit pass-through preserves PC data rates when the phone's PC port is daisy-chained.
Recommended
WLAN Access Point Powering
Wireless LAN access points installed on ceilings or high walls frequently lack a convenient AC outlet, making PoE the only practical power method. The PD-3501G/AC-US supplies 48V DC at up to 15.4W, sufficient for 802.3af-class indoor access points, while its Gigabit 10/100/1000 Mbps pass-through ensures the backhaul link is not bottlenecked when serving Wi-Fi 5/6 client loads. Because the midspan leaves the existing Ethernet infrastructure completely unaltered, network teams can add coverage in a conference room or remote wing without forklift-upgrading the wiring closet. Per the Microchip datasheet, the unit's plug-and-play detection applies power only after validating the powered device, protecting the switch port. The main constraint is the 100 m Ethernet channel limit and the 15.4W ceiling, which excludes high-power 802.3at APs.
Recommended
Network Camera Surveillance
IP surveillance cameras are classic single-point PoE loads: fixed-dome and bullet cameras typically draw 5-12W, comfortably inside the PD-3501G/AC-US's 15.4W 802.3af delivery. The midspan's 48V output travels up to 100 m over standard Ethernet cable, letting installers mount cameras on poles, eaves, or ceilings with only a data run - no electrician required. Its Gigabit pass-through supports high-resolution multi-megapixel camera streams without compression artifacts from a 100 Mbps bottleneck. The 802.3af detection and classification handshake ensures power is only applied to a genuine camera, so accidental patching of the injector output into a switch does no damage. For outdoor cameras the injector itself should sit in a controlled indoor environment; the PD-3501GO-ET/AC handles exposed mounting directly.
Recommended
Low-Port-Density Office Retrofit
Many small offices and branch sites need PoE for only one or two devices but already own functional non-PoE switches. The PD-3501G/AC-US solves this economically: at roughly $89 unit price as of 2026-10-19, it costs far less than a PoE-capable switch and installs with zero configuration. Per the Microchip datasheet, its compact, cost-effective design leverages the existing Ethernet infrastructure while leaving it completely unaltered, which also means no downtime for re-cabling. As an AC-input unit (IEC 320-C14, up to 240V AC), it plugs into any standard office outlet. When the site later grows beyond about 4-8 powered devices, migrating to a multi-port PoE switch is straightforward since the structured cabling and powered-device ends require no changes.
Recommended
Campus Telephony Infrastructure
Legacy enterprise telephony estates - including ShoreTel and Polycom deployments - widely specify the PowerDsine 3501G (now Microchip PD-3501G) as their reference Gigabit PoE injector, which makes the PD-3501G/AC-US the standard service-spares part for maintaining those campuses. Its full IEEE 802.3af compliance guarantees interoperability with any vendor's compliant phone, and the 48V/0.32A output matches the 15.4W spec assumed by phone power budgets. Because the ordering family spans US, EU, UK, JP, AU, and BR cord codes per the Microchip PoE Quick Reference Guide, global facilities can standardize on one electrical design while ordering local cords. Keeping a few units as hot spares minimizes downtime when a desk moves or an injector fails, and Gigabit pass-through keeps PC daisy-chain speeds unaffected.
Recommended
IP Terminal Bench and Lab Powering
Network engineers validating IP phones, cameras, and access points need a reliable 802.3af reference PSE on the bench. The PD-3501G/AC-US provides exactly the standardized behavior a DUT will see in the field: detection signature measurement, classification handshake, and 48V DC application per IEEE 802.3af, at full Gigabit data rates for traffic testing. Its desktop form factor and plug-and-play operation mean no rack space or configuration is consumed in the lab. Compared with bench AC/DC adapters, the midspan's standards-compliant detection protects non-PoE test gear accidentally connected, and it faithfully reproduces inrush and classification timing for interoperability debugging. The 0 C minimum operating temperature and indoor rating are non-issues in a climate-controlled lab environment.
Recommended
Recommended Products Summary
Engineering reference data for PD-3501G/AC-US — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PD-3501G/AC-TW | PD-3501GO-ET/AC | PD-3501/AC-US |
|---|---|---|---|---|
| Package / Form Factor | Desktop midspan enclosure (XMA), IEC 320-C14 + 2x RJ45 | Same desktop enclosure | Outdoor extended-temperature enclosure | Same desktop enclosure |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| PoE Standard | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af | IEEE 802.3af |
| Output Power | 15.4 W (48 V, 0.32 A) | 15.4 W | 15.4 W | 15.4 W |
| Data Rate | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100/1000 Mbps | 10/100 Mbps |
| Power Cord Region | US (North America) | Taiwan | AC variant (cord per ordering code) | US (North America) |
| Environment | Indoor, 0 C minimum | Indoor | Outdoor, extended temperature | Indoor |
| Number of PoE Ports | 1 | 1 | 1 | 1 |
Key Differentiators
- Gigabit pass-through preserved (vs PD-3501/AC-US)
- Cost-effective single-port PoE retrofit (vs Multi-port PoE switch)
- Plug-and-play infrastructure preservation (vs Endspan PoE switch upgrade)
Design Notes
Verify the powered device's 802.3af classification before deploying: the PD-3501G/AC-US delivers a maximum of 15.4W (48V x 0.32A), which supports Class 0-3 PDs and lower-power Class 4 devices only. Devices requiring 802.3at (PoE+) power, such as PTZ cameras with heaters or high-power outdoor APs, will not power up. Also confirm the AC feed: the IEC 320-C14 inlet accepts up to 240V AC, but the supplied US cord is rated for North American mains - use a locally rated IEC 320-C13 cord when deploying -EU/-UK variants or when relocating units abroad.
Do not connect the PD-3501G/AC-US DATA AND POWER OUT port to another switch's Ethernet port expecting damage - 802.3af detection prevents power application to a non-PD signature - but do not use it as a permanent pass-through either, since it consumes the port's PoE capability and adds a connection point. Respect the 100 m Ethernet channel limit across BOTH cable segments (switch-to-midspan plus midspan-to-PD combined); long patch cables on the input side silently steal budget from the camera run and can cause intermittent detection failures.
Place the injector in a ventilated indoor location with free convection around the enclosure; it is rated for 0 C minimum ambient, so unheated warehouses and outdoor junction boxes in cold climates are out of spec. At 15.4W full load, internal losses are modest but the sealed desktop housing depends on surface convection - avoid stacking units or enclosing them in locked, unventilated cabinets. For exposed or high-ambient sites, migrate to the PD-3501GO-ET/AC extended-temperature outdoor variant of the same family.
Compliance Information
IEEE 802.3af compliance is confirmed in the Microchip datasheet. RoHS/REACH/lead-free status for this specific ordering code is not stated in the verified data - confirm on the Microchip product page compliance annex.
