onsemi 2SD1047P-E

Overview

2SD1047P-E from SANYO is an NPN triple diffused planar silicon power transistor in TO-3PB package, rated for V_CEO = 140 V, I_C = 12 A, P_C = 120 W at T_c = 25°C, with f_T = 15 MHz and built-in ballast resistance for wide ASO-designed for high-fidelity audio output stages and linear power amplifiers.

For engineers reviewing the 2SD1047P-E datasheet, pinout, applications, or equivalent options, key selection criteria include its 140 V collector-emitter breakdown, 12 A continuous current capability, low V_CE(sat) of 0.6 V (typ.) at I_C = 5 A / I_B = 0.5 A, and robust thermal performance in fixed-mount plastic housing interchangeable with TO-3.

Technical Context

The 2SD1047P-E operates as a linear NPN power switch with epitaxial base and triple diffusion process, enabling stable DC current gain (h_FE = 60–200 at I_C = 1 A) and good high-frequency response up to 15 MHz. Its integrated ballast resistor improves safe operating area (ASO) under second breakdown conditions.

Designed for Class AB audio output stages, it supports fast switching (t_on = 0.26 µs, t_f = 0.68 µs) and exhibits low output capacitance (C_ob = 210 pF typ. at V_CB = −10 V), making it suitable for high-slew-rate amplifier designs requiring tight thermal coupling and mechanical mounting simplicity.

Key Specifications

Pinout & Package

2SD1047P-E uses the TO-3PB plastic molded package with one-point fixing mount, dimensionally compatible with TO-3 metal cans but offering simplified assembly and insulation. Package outline matches SANYO standard TS IM TA-3036.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power transistor applications.

Compared with 2SD1047P-E, 2SC2922 trades voltage headroom for current margin and thermal robustness, while MJE13009 sacrifices bandwidth and saturation performance for extreme voltage tolerance-neither is pin-compatible, and both require layout and bias network re-evaluation.

Availability

2SD1047P-E is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, linear power supplies, RF driver stages, and industrial motor control applications requiring stable component supply and long-term obsolescence management.

Supply support for 2SD1047P-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer known for high-reliability analog and power devices before its acquisition by Panasonic in 2012; its legacy power transistor portfolio remains widely deployed in industrial and audio systems.

The 2SD1047P-E belongs to SANYO's AF80W output transistor family, engineered specifically for high-current, high-voltage linear amplification with emphasis on thermal stability, safe operating area, and audio-grade linearity.

FAQ

What is the maximum junction temperature rating for the 2SD1047P-E?

The 2SD1047P-E has a maximum junction temperature (T_j) rating of 150°C, as specified in its Absolute Maximum Ratings table. This value defines the upper thermal limit for reliable operation; sustained operation near this threshold requires careful heatsink design and derating per the P_C vs. T_c curve. The 2SD1047P-E must be mounted with appropriate thermal interface material to maintain T_j ≤ 150°C under worst-case load and ambient conditions.

Is the 2SD1047P-E pin-compatible with the 2SB817P?

No-the 2SD1047P-E (NPN) and 2SB817P (PNP) share identical TO-3PB package pinout (Base=1, Collector=2, Emitter=3) and mechanical dimensions, but they are complementary devices, not pin-compatible replacements. The 2SD1047P-E cannot substitute for the 2SB817P in circuit function without polarity reversal and bias network redesign. Both are intended for use together in push-pull output stages.

Does the 2SD1047P-E have built-in protection features like thermal shutdown?

No-the 2SD1047P-E is a discrete bipolar junction transistor with no integrated protection circuitry. It relies entirely on external design measures-including heatsinking, current limiting, SOA-aware biasing, and external thermal cutoffs-to prevent failure. The built-in ballast resistor improves safe operating area but does not provide active thermal shutdown or overcurrent protection.

What is the typical storage time (t_stg) of the 2SD1047P-E under standard test conditions?

The typical storage time (t_stg) of the 2SD1047P-E is 6.88 µs, measured under the specified switching test circuit with I_C = 1 A and base drive conditions defined in the datasheet. This parameter reflects minority carrier storage delay during turn-off and directly impacts maximum usable switching frequency in linear or quasi-switching applications. The 2SD1047P-E's t_stg is higher than small-signal transistors due to its power structure, limiting suitability for >100 kHz PWM without careful drive optimization.

Can the 2SD1047P-E be used in parallel configurations without external emitter resistors?

Yes-the 2SD1047P-E incorporates a built-in ballast resistor that promotes current sharing among paralleled devices, reducing the need for discrete emitter resistors in many cases. However, for precision current balancing-especially across multiple units with varying h_FE bins or thermal gradients-external 0.1–0.5 Ω emitter resistors are still recommended. The 2SD1047P-E's internal ballast improves ASO but does not eliminate all mismatch risks in high-reliability parallel deployments.