D882 (2SD882) — 30V 3A Low-Saturation Medium-Power NPN BJT (TO-126)

Overview

The D882 (officially 2SD882) is a 30V 3A medium-power silicon NPN bipolar junction transistor manufactured by NEC, Toshiba, UTC (Unisonic), and STMicroelectronics. Housed in a through-hole TO-126 (SOT-32) plastic package with a central mounting hole, it is renowned for its extraordinarily low saturation voltage.

Rated for a continuous collector current of $3.0\text{A}$ ( $7.0\text{A}$ pulsed peak) and a collector saturation voltage ( $V_{CE(sat)}$ ) as low as $0.3\text{V} \dots 0.5\text{V}$ at $2.0\text{A}$ , the D882 operates with minimal conduction losses compared to standard medium-power BJTs. Paired with its PNP complement B772 (2SB772), the D882 is ubiquitous throughout Asian electronics in low-voltage emergency lamp inverters, discrete audio power amplifier output stages, battery-powered camera strobe flash drivers, linear voltage regulator pass elements, and toy RC motor drivers.

Quick reference


Transistor Type	Medium-Power Low-Saturation Silicon NPN BJT
Package	TO-126 / SOT-32 (3-pin through-hole with mounting hole) / SOT-89
Collector-Emitter Voltage ( $V_{CEO}$ )	$30\text{ V}$ max
Collector-Base Voltage ( $V_{CBO}$ )	$40\text{ V}$ max
Continuous Collector Current ( $I_C$ )	$3.0\text{ A}$ max ( $7.0\text{ A}$ pulsed peak)
Base Current ( $I_B$ )	$0.5\text{ A}$ max
Collector Saturation ( $V_{CE(sat)}$ )	$0.3\text{ V}$ typ / $0.5\text{ V}$ max at $I_C = 2.0\text{A}, I_B = 200\text{mA}$
DC Current Gain ( $h_{FE}$ )	$60$ to $400$ (Classified by gain rank: R, Q, P, E)
Transition Frequency ( $f_T$ )	$90\text{ MHz} \dots 150\text{ MHz}$
Power Dissipation ( $P_D$ )	$10.0\text{ Watts}$ ( $T_C = 25^\circ\text{C}$ with heatsink) / $1.0\text{ W}$ free air
Complementary PNP Pair	B772 (2SB772)

Pinout (TO-126 Package - Japanese JIS Standard)

Looking at the printed front face of the TO-126 package with leads pointing downward:

text

        ┌───────────────┐
        │   O [Mount]   │
        ├───────────────┤
        │     D882      │
        └─┬─────┬─────┬─┘
          1     2     3
          E     C     B

Pin	Name	Type	Description
1	`EMITTER`	Emitter Terminal	Emitter (Connect to ground or negative rail)
2	`COLLECTOR`	Collector Terminal	Collector (Connected to switched load; internally bonded to rear metal tab)
3	`BASE`	Base Terminal	Base control input (Driven with base current via series resistor)

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Collector-Emitter Breakdown	$V_{(BR)CEO}$	30	—	—	V	$I_C = 10\text{mA}, I_B = 0$
Collector-Base Breakdown	$V_{(BR)CBO}$	40	—	—	V	$I_C = 100\ \mu\text{A}, I_E = 0$
Emitter-Base Breakdown	$V_{(BR)EBO}$	6.0	—	—	V	$I_E = 10\ \mu\text{A}, I_C = 0$
Collector Cutoff Current	$I_{CBO}$	—	—	1.0	µA	$V_{CB} = 30\text{V}, I_E = 0$
DC Current Gain ( $h_{FE}$ )	$h_{FE}$	60	—	400	—	$I_C = 1.0\text{A}, V_{CE} = 2.0\text{V}$
Collector Saturation Voltage	$V_{CE(sat)}$	—	0.30	0.50	V	$I_C = 2.0\text{A}, I_B = 200\text{mA}$
Base Saturation Voltage	$V_{BE(sat)}$	—	1.00	2.00	V	$I_C = 2.0\text{A}, I_B = 200\text{mA}$
Transition Frequency	$f_T$	50	90	—	MHz	$I_C = 500\text{mA}, V_{CE} = 5.0\text{V}$

$h_{FE}$ Classification Ranks

Rank	$h_{FE}$ Range	Common Application
R	$60 \dots 120$	High-power switching
Q	$100 \dots 200$	General purpose power switching
P	$160 \dots 320$	Audio amplifier drivers & general DIY kits
E	$200 \dots 400$	High-gain audio output & low-current drive

Comparison: D882 vs BD139 vs TIP31C

Parameter	D882	BD139	TIP31C
$V_{CEO}$ Voltage	$30\text{ V}$	$80\text{ V}$	$100\text{ V}$
Max Current ( $I_C$ )	$3.0\text{ A}$	$1.5\text{ A}$	$3.0\text{ A}$
Saturation $V_{CE(sat)}$	$0.3\text{ V}$ at 2A (Ultra-Low)	$0.5\text{ V}$ at 0.5A	$1.2\text{ V}$ at 3A
Package	TO-126 (Compact)	TO-126 (Compact)	TO-220 (Large)

Common mistakes

Exceeding the 30V breakdown voltage rating: Unlike the 80V BD139, the D882 has a maximum $V_{CEO}$ limit of $30\text{V}$ . Connecting it to 36V or 48V power supplies will cause immediate collector-emitter avalanche breakdown.
Overheating without a heatsink at 2A+ loads: Although $V_{CE(sat)}$ is low, switching continuous currents above $1.0\text{A}$ requires mounting the TO-126 tab to a heatsink.

Notes

Naming Convention: 2SD882 is the full Japanese Industrial Standard (JIS) part number; D882 is the standard top-mark abbreviation printed on the physical package.

Interface	Current-Driven Base Junction
Package	SOT-32 / TO-126 (3-pin through-hole with mounting hole) / SOT-89