onsemi 2SD734E

Overview

2SD734E from SANYO is a PNP epitaxial planar silicon transistor rated for 1 W collector dissipation, −50 V V_CEO, −700 mA I_C, with DC current gain (h_FE) of 60–120 at −50 mA I_C, used in audio output stages, electronic governors, and DC-DC converter switching circuits.

For engineers reviewing the 2SD734E datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, −50 V V_CEO, −700 mA I_C continuous rating, 1 W power handling, and suitability for linear AF output and medium-current switching in industrial control and power conversion.

Technical Context

This device operates as a medium-power PNP bipolar junction transistor with epitaxial planar construction, optimized for audio-frequency amplification and switching. Its −50 V V_CEO and −700 mA I_C support robust operation in DC-DC converter topologies requiring high reverse voltage tolerance and moderate current drive.

The 2SD734E exhibits h_FE = 60–120 at −50 mA I_C and −2 V V_CE, with f_T ≈ 25 MHz at −50 mA I_C and −10 V V_CE, confirming suitability for low-to-mid frequency switching and linear amplification up to ~100 kHz without significant gain roll-off.

Key Specifications

Pinout & Package

2SD734E uses the TO-92 (SC-43) plastic package with standard lead configuration: Emitter (Pin 1), Collector (Pin 2), Base (Pin 3). Mounting orientation follows SANYO's "NP" marking convention (notch facing up, leads down).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Compared with 2SB698 and MJD2955G, the 2SD734E offers balanced gain, proven reliability in TO-92 form factor, and optimal fit for space-constrained 1 W applications-whereas 2SB698 trades wider h_FE for tighter gain control, and MJD2955G addresses higher power tiers at cost of board real estate and thermal complexity.

Availability

2SD734E is available at Aetrix Electronics and suitable for audio output stages, electronic governors, and DC-DC converter switching applications requiring stable component supply and long-term industrial availability.

Supply support for 2SD734E 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 discrete devices and analog ICs before its acquisition by Panasonic in 2012; its transistor portfolio emphasized ruggedness and consistency in industrial environments.

The 2SD734E belongs to SANYO's general-purpose PNP transistor family designed specifically for audio amplification, power switching, and precision control in automotive, industrial, and consumer equipment where TO-92 packaging and 1 W dissipation were critical requirements.

FAQ

What is the maximum collector-emitter voltage rating for the 2SD734E?

The 2SD734E has a maximum collector-emitter voltage (V_CEO) rating of −50 V with the base open. This rating defines the upper limit for safe operation in switching applications such as DC-DC converters and electronic governors. Exceeding this voltage-even momentarily-may cause irreversible breakdown. The 2SD734E must be operated within this limit under all conditions, including transient spikes and inductive kickback scenarios.

Is the 2SD734E suitable for audio amplifier output stages?

Yes, the 2SD734E is explicitly specified for 1 W AF output applications. Its −700 mA I_C, −50 V V_CEO, and low V_CE(sat) (≤ −0.5 V at −500 mA) make it well-suited for Class-A/B output stages driving 8 Ω loads. The 2SD734E's h_FE binning (60–120) also supports consistent biasing in push-pull configurations, and its TO-92 package simplifies integration into compact audio modules.

What is the DC current gain (h_FE) range of the 2SD734E and under what conditions is it measured?

The 2SD734E has a DC current gain (h_FE) range of 60 to 120, measured at I_C = −50 mA and V_CE = −2 V. This specification applies to the standard grade and reflects the device's gain consistency across production lots. The 2SD734E's h_FE remains stable over its operational temperature range, supporting reliable bias design in electronic governors and linear regulators without requiring gain-compensation circuitry.

Can the 2SD734E replace the 2SB698 in existing designs?

The 2SD734E and 2SB698 share identical package, pinout, and absolute maximum ratings, but differ in h_FE binning: 2SB698 is rated 100–200, while the 2SD734E is 60–120. Substituting the 2SD734E for 2SB698 may require adjusting base drive current to maintain saturation. The 2SD734E is not a guaranteed drop-in replacement unless the original design accommodates lower h_FE; verify base resistor values and V_CE(sat) in circuit simulation or bench test.

What thermal considerations apply to the 2SD734E at full power dissipation?

At its maximum rated collector dissipation of 1.0 W, the 2SD734E requires careful thermal management. With a junction-to-ambient thermal resistance (R_θJA) of approximately 200°C/W in free air, operation at full power raises junction temperature by ~200°C above ambient-exceeding its +150°C T_j(max). Therefore, the 2SD734E must be derated above 25°C ambient or mounted on a small copper pad (≥1 cm²) to reduce R_θJA and ensure safe operation across its full temperature range.