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DELL 250W PSU POWER SUPPLY UNIT H250AD-00 D250AD-00 OPTIPLEX 390 790 9 - $35 (Brooklyn)
Brighton 4th Street near Brightwater Ct
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Short summary
A Dell 250W internal power supply module commonly sold under part numbers H250AD-00, D250AD-00 (sometimes listed as D250AD005L), F250AD-00, L250NS-00 and related factory/aftermarket codes. It’s a compact 250-watt supply used in Dell Slim / Small Desktop (SFF/DT) and Slim Inspiron/Studio/Vostro systems. Typical features: 250W total output, universal AC input (100–240V 50/60Hz), internal fan, 24-pin style motherboard connector (Dell slim/DT pinout), and SATA / peripheral power connectors for drives.
Technical highlights (what buyers care about)
Wattage: 250 W total maximum.
Input: Universal AC (typically quoted as 100–240V ~, 50–60Hz, ~4.4A on listings).
Form factor: Slim / Small Desktop / SFF internal power module (not a full-size ATX tower PSU). Check physical dimensions and bracket before purchase.
Connectors: Designed for Dell slim/DT motherboards — includes the motherboard power connector used by these chassis and SATA power connectors for drives. (Exact connector count varies by supplier; verify against the existing unit.)
Cooling: Internal fan (typical single fan, exhaust to chassis).
Common alternate / cross part numbers: F250AD-00, L250NS-00, PS-5251-08D and many vendor SKUs (sellers bundle several codes in listings).
Compatible Dell systems (verified from vendor listings and Dell SFF documentation)
This PSU is used in many Dell Slim / Small Desktop lines. Common compatible systems reported by OEM/aftermarket listings and Dell documentation include:
OptiPlex family
OptiPlex 3010 (DT)
OptiPlex 390 (Slim / SFF)
OptiPlex 790 (Small Desktop / DT)
OptiPlex 990 (Small Desktop / DT)
(Note: some closely related OptiPlex models — e.g., 7010/9010 — may use similar 250W modules but confirm part number; variants exist by chassis.)
Inspiron / Studio / Vostro / Slim series frequently listed
Inspiron 530s, 531s, 537s, 540s, 545s, 546s, 560s, 570s, 580s, 620s (Slim/“s” series / Slim Desktop)
Studio 537s, Studio 540s, Studio 560s (Slim models)
Vostro 200, 200s, 220s, 230s, 260s, 400s (slim / small desktop variants)
Inspiron 537s / 540s / 560s Slim Desktop systems (common listing).
Important compatibility notes and exceptions
This module is for Dell Slim / Small Desktop (SFF/DT) chassis. It is NOT generally compatible with Dell Mini Tower (MT) or Ultra Small Form Factor (USFF) systems unless the system uses the same part number and connector — those chassis often use different power modules. Many aftermarket listings explicitly warn it will not work in MT or USFF enclosures. Always confirm the exact PSU part number printed on your existing unit.
Connector / mounting differences: Dell used slightly different connector pinouts and chassis mounting points across generations. Even when a listing claims “compatible with X, Y, Z,” you must verify that the mounting screw locations and motherboard cable plug match your system.
OEM vs aftermarket: Some sellers list the same supply under many cross SKUs — these are often aftermarket replacements (unbranded or 3rd-party). If you require an OEM Dell-branded unit, verify seller photos, part label close-ups, and seller claims.
Installation checklist (quick buyer guidance)
Open your PC and read the label on your existing PSU. Confirm the Dell part number (e.g., H250AD-00, D250AD-00, L250NS-00, PS-5251-08D, etc.). If they match one of the cross-reference numbers above, the replacement is likely correct.
Confirm connector shape & number. Count SATA, Molex, and the main motherboard power plug and visually confirm pinout/mating shape.
Confirm chassis/rail mounting. Verify screw holes / bracket style match your chassis (SFF vs DT vs MT differences).
If in doubt, keep the old PSU label picture and send it to the parts seller to confirm exact fit. Many vendors will ask for a photo of the label to guarantee an exact match.