D882 Transistor: Pinout, Specs, Uses and Equivalents | Nachrichtenliste

The D882, usually ordered as 2SD882 or KSD882, is a medium-power NPN bipolar transistor used for relay driving, voltage regulation, audio power stages, DC-DC converters and general switching. A typical device is rated for 30 V collector-emitter voltage and 3 A continuous collector current, but the pinout and several maximum ratings vary by manufacturer and package. Check the exact datasheet printed on your part before replacing it.

D882 2SD882 transistor pinout and key specifications

D882 Transistor Specifications

The following values come from current manufacturer documents, not from a generic cross-reference list. They show why a full manufacturer part number matters: devices sold under the D882 family name are similar, but not identical.

Parameter	UTC 2SD882	ST 2SD882
Transistor type	NPN silicon BJT	NPN medium-power BJT
Collector-emitter voltage, VCEO	30 V	30 V
Collector-base voltage, VCBO	40 V	60 V
Emitter-base voltage, VEBO	7 V	5 V
Continuous collector current, IC	3 A	3 A
Peak collector current	7 A pulse	6 A peak, tp < 5 ms
DC current gain	100-400 at IC = 1 A, by gain rank	80 min at IC = 1 A; 30 min at IC = 3 A
Collector-emitter saturation	0.5 V max at IC = 2 A, IB = 0.2 A	0.7 V max at IC = 2 A, IB = 0.1 A
Transition frequency	80 MHz typical	100 MHz typical
Maximum junction temperature	150 degrees C	150 degrees C

Important: maximum ratings are stress limits, not recommended operating points. At high current, verify the safe operating area, base drive and thermal design instead of assuming that a 3 A label means the transistor can carry 3 A continuously in any circuit.

D882 Pinout: Check the Package First

There is no safe universal pinout for every part marked D882. For UTC parts, the manufacturer lists these assignments when the package is viewed according to its datasheet drawing:

UTC package	Pin 1	Pin 2	Pin 3
TO-126 / TO-126C / TO-126S	Emitter	Collector	Base
TO-251 / TO-252	Base	Collector	Emitter
TO-92NL	Emitter	Collector	Base
2SD882S in SOT-223 / SOT-89	Base	Collector	Emitter

Do not install a replacement by matching only the package shape. Confirm the manufacturer logo, full suffix, package drawing and orientation. A base-emitter reversal can prevent operation; a collector-emitter reversal can damage the transistor or the surrounding circuit.

How the D882 Works

The D882 is an NPN bipolar junction transistor. A base current controls a larger collector current. In a low-side switching circuit, the emitter normally connects toward ground, the load sits between the supply and collector, and the controller drives the base through a calculated resistor.

The base drive must be designed for the required collector current. Do not size the resistor from the headline hFE alone: gain falls at high current, and switching designs normally use forced beta with enough base current to reach the specified saturation voltage. Inductive loads such as relays and motors also need a correctly rated flyback path.

Common D882 Applications

ST lists voltage regulation, relay driving, generic switching, audio power amplification and DC-DC conversion as applications for its 2SD882. UTC lists audio power amplification, DC-DC conversion and voltage regulation. Typical design roles include:

Relay and solenoid driver: the D882 can switch loads that exceed a small controller output, provided base current, flyback protection and power dissipation are checked.
Audio output or driver stage: the device can be paired with its PNP complement in suitable low-voltage amplifier designs.
Series-pass regulator: it can provide current gain in linear regulator circuits, but requires thermal and safe-operating-area calculations.
DC-DC converter or general switch: low saturation voltage helps reduce conduction loss, while switching speed and losses still need verification at the actual frequency.

D882 Equivalent and Replacement Options

The safest replacement is the same qualified manufacturer part and gain grade. ST 2SD882, UTC 2SD882 and onsemi KSD882 belong to the same functional family, but their voltage ratings, gain test limits, dissipation figures and package details are not identical.

Part	Relationship to D882	What must be checked
2SD882	Full Japanese-style designation commonly shortened to D882	Manufacturer, gain suffix, package and pinout
KSD882	onsemi NPN device with the D882 marking and 30 V / 3 A headline ratings	TO-126 pinout, gain grade, saturation and thermal conditions
2SD882S	Surface-mount and TO-92 family variant from UTC	Lower package dissipation and different pin assignment
2SB772 / KSB772	PNP complementary device	Not an NPN drop-in replacement; circuit polarity and bias are different

Parts such as C945, BC327, BD139, MJE340 or TIP41 are sometimes listed online as universal substitutes, but they are not automatically equivalent. Some have the wrong polarity, lower current capability, different gain, slower switching behavior or a different pinout. Compare at least VCEO, IC, pulse current, hFE at the real operating current, VCE(sat), power dissipation, safe operating area, package and pin order before approving any substitute.

How to Identify and Test a D882

Read the complete top marking, logo and gain suffix rather than only the large D882 code.
Match the package and pin assignment to that manufacturer's datasheet.
With the part removed and discharged, use diode-test mode to identify the base-emitter and base-collector junctions. Both should behave like silicon diode junctions in the forward direction.
Check for collector-emitter shorts before applying power.
For repaired equipment, compare the replacement under the circuit's real current and temperature instead of relying only on a handheld hFE reading.

D882 Datasheets and Primary Sources

When sourcing a D882 for repair or production, specify the manufacturer, full order code, package, gain grade, quantity and required date code. For an obsolete or allocation-constrained version, include the original datasheet and circuit requirements in your RFQ so that any proposed alternative can be checked before purchase.