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BCM59121B0KMLG

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The BCM59121B0KMLG is a Broadcom octal (8-channel) Power Sourcing Equipment (PSE) controller compliant with IEEE 802.3at (PoE+) and 802.3af (PoE) standards, delivering up to 30 W per port from a 44–57 V supply. The integrated 8-port PSE management with per-port current sensing, classification, and disconnect detection enables compact PoE switch and midspan designs. Housed in a 56-pin QFN (8 × 8 mm) package, it operates over -40 °C to +85 °C. Note: this part is End-of-Life (EOL) — stock is limited to remaining inventory.

Stock & Date Code

Brand	Part Number	Qty	D/C	Note
Broadcom	BCM59121B0KMLG	2,850	25+	Broadcom BCM59121B0KMLG Power over Ethernet Controller; confirm date code, lot and packing condition by RFQ.

Listed stock and date code are subject to final RFQ confirmation.

Power IC Specifications

Parameter	Value / Specification
Exact Part Number	BCM59121B0KMLG
Manufacturer	Broadcom
Product Category	PoE PSE Controller
Function / Topology	Octal Power Sourcing Equipment (PSE) controller, IEEE 802.3at Type 2 (PoE+) and 802.3af Type 1 (PoE) compliant
Input Voltage	44 V to 57 V supply voltage (nominal 48 V PoE rail), 500 mA supply current typical
Output Current	8 independent PoE channels, 30 W mmum per port (PoE+), with per-port current sensing, classification, and disconnect detection
Internal Switch	No internal power MOSFETs — ernal FET drive per channel for scalable PoE port power design
Operating Temperature	-40 °C to +85 °C, industrial temperature range
Package / Case	56-QFN (8 × 8 mm, 0.5 mm pitch, SMT, osed pad, Tray)

Power Features & Applications

8-channel IEEE 802.3at/af PSE controller supporting 30 W per port with per-channel current sensing, hardware classification, and AC/DC disconnect detection
44–57 V wide input range with 500 mA typical supply current, external MOSFET drive per port enabling scalable power delivery from 15.4 W (af) to 30 W (at)
Integrated 8-port management engine with I²C interface for per-port power monitoring, fault reporting, and programmable power limits
56-pin QFN package (8 × 8 mm, 0.5 mm pitch) with exposed thermal pad, -40 °C to +85 °C industrial temperature range, RoHS compliant
End-of-Life status — limited remaining stock for legacy PoE switch, midspan injector, and industrial Ethernet equipment maintenance and replacement
Designed for enterprise PoE switches, midspan power injectors, IP camera NVRs, and industrial Ethernet PSE equipment

Why Procurement Teams Source BCM59121B0KMLG

BCM59121B0KMLG demand is usually tied to transistor and MOSFET production replenishment, where casual substitution can create validation or schedule risk. 2,850 pcs is listed as project-level spot stock; LimChip should confirm live allocation, batch condition and lead time before purchase. Suited to buyers needing the exact BCM59121B0KMLG ordering code — the Power over Ethernet Controller in 56-QFN (8 × 8 mm, 0.5 mm pitch, SMT, exposed pad, Tray) — rather than a generic part.

LimChip can confirm current price, date code, packing condition, lot traceability and shipment schedule for BCM59121B0KMLG.

Power Component Sourcing Checklist

Confirm voltage, current, thermal rating and protection features against the original BOM.
Match 56-QFN (8 × 8 mm, 0.5 mm pitch, SMT, osed pad, Tray), reel format and automotive or industrial grade requirements when needed.
Confirm live allocation, quantity and 25+ before order release.

BCM59121B0KMLG (Power over Ethernet Controller, tray) is offered from stock; live quantity and lot split are confirmed by RFQ.

Need Price & Availability for BCM59121B0KMLG?

LimChip can confirm current price, date code, packing condition, lot traceability and shipment schedule for BCM59121B0KMLG.

Listed stock is subject to final RFQ confirmation.

For faster RFQ confirmation, please include:

Required quantity
Target date code
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Quality, Shipping & Payment

Commercial and shipment details for BCM59121B0KMLG are confirmed with the formal quotation.

Quality Confirmation

Date code, batch, package, label and marking details are checked before shipment. Inspection photos and third-party inspection support are available when required.

Shipping

LimChip supports worldwide delivery through established logistics providers. Carrier, lead time, tracking and buyer-appointed freight-forwarder requirements are confirmed by our sales team.

Payment

Payment method, currency and trade terms are confirmed in the formal quotation or proforma invoice. Contact our sales team for the options available for your order.

Frequently Asked Questions

Is BCM59121B0KMLG available from LimChip?

LimChip can confirm current availability, price, quantity, date code and lead time for BCM59121B0KMLG by RFQ.

What should buyers check before ordering BCM59121B0KMLG?

Buyers should check voltage range, current rating, package, protection features and date code for BCM59121B0KMLG, together with live stock and traceable supply.

How do I request a quote for BCM59121B0KMLG?

Use the RFQ button and include required quantity, target date code, package/case requirement, delivery country, company name and contact details.