onsemi BC337-25ZL1

Overview

BC337-25ZL1 from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 45 V_CEO, 800 mA continuous collector current, and DC current gain (h_FE) of 160–250 at I_C = 100 mA, V_CE = 1.0 V. It operates across −55°C to +150°C junction temperature and is commonly used in low-voltage switching and linear amplification stages of consumer and industrial control circuits.

For engineers reviewing the BC337-25ZL1 datasheet, pinout, applications, or equivalent options, key selection considerations include its guaranteed h_FE range (160–250), V_CE(sat) ≤ 0.7 V at I_C/I_B = 10, f_T = 210 MHz typical, and TO-92 thermal resistance (R_JA = 200°C/W).

Technical Context

The BC337-25ZL1 is a discrete bipolar junction transistor optimized for medium-current linear amplification and saturated switching. Its h_FE binning (−25 suffix) guarantees minimum 160 and typical 250 gain at 100 mA/1 V, with V_BE(on) ≤ 1.2 V and V_CE(sat) ≤ 0.7 V under specified drive conditions.

Thermally, it uses a TO-92 (Case 29, Style 17) package with R_JC = 83.3°C/W and R_JA = 200°C/W, supporting up to 625 mW at T_A = 25°C (derated 5 mW/°C above). Safe operating area (SOA) is defined up to 1 ms pulse width with V_CEO ≤ 45 V and I_C ≤ 500 mA.

Key Specifications

Pinout & Package

BC337-25ZL1 is housed in a TO-92 plastic package (Case 29, Style 17), with standardized lead orientation: flat side facing viewer, leads downward, left-to-right pin order as Collector–Base–Emitter.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Compared with BC337-25RL1 and BC337-25G, the BC337-25ZL1 offers identical transistor performance and TO-92 packaging, differing only in packaging format (ammo box) and lead finish (standard SnPb), making it optimal for prototyping, repair, and low-volume production where reel or RoHS compliance is not required.

Availability

BC337-25ZL1 is available at Aetrix Electronics and suitable for audio amplification, microcontroller interfacing, DC motor control, and industrial sensor conditioning requiring stable component supply and long-term obsolescence management.

Supply support for BC337-25ZL1 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The BC337-25ZL1 belongs to onsemi's legacy general-purpose bipolar transistor family, designed for cost-sensitive, high-reliability linear amplification and switching in consumer, industrial, and automotive subsystems.

FAQ

What is the guaranteed h_FE range for BC337-25ZL1?

The BC337-25ZL1 is binned to guarantee h_FE ≥ 160 and typically 250 at I_C = 100 mA and V_CE = 1.0 V. This −25 suffix denotes the mid-gain variant within the BC337 family, distinct from −16 (h_FE ≥ 100) and −40 (h_FE ≥ 250). Designers can rely on this minimum gain for stable bias network calculations without lot-to-lot variation concerns.

Is BC337-25ZL1 RoHS-compliant?

The BC337-25ZL1 is not RoHS-compliant by default, as it features standard SnPb lead finish. For RoHS-compliant versions, select BC337-25ZL1G (same packaging, Pb-free plating). Both share identical electrical characteristics and TO-92 mechanical form factor, with only surface finish and compliance documentation differing.

What is the maximum power dissipation of BC337-25ZL1 at room temperature?

At T_A = 25°C, the BC337-25ZL1 has a total device dissipation rating of 625 mW, derated linearly at 5 mW/°C above 25°C. In practice, sustained operation above ~300 mW requires PCB copper pour or airflow due to R_JA = 200°C/W; junction temperature must remain ≤ 150°C for reliability.

Can BC337-25ZL1 replace BC337-25 in existing designs?

Yes - BC337-25ZL1 is functionally and electrically identical to BC337-25, differing only in packaging format (ammo box vs. bulk box) and part number suffix. All electrical parameters, pinout, thermal specs, and marking ("7−25") match exactly; no schematic or layout changes are needed when substituting BC337-25ZL1 for BC337-25.

What is the safe operating area (SOA) limit for BC337-25ZL1 in pulsed operation?

The BC337-25ZL1 SOA curve (Figure 2) permits up to 500 mA at V_CE = 10 V for 1 ms pulses, or 100 mA at V_CE = 45 V for DC operation. Secondary breakdown limits apply beyond 10 µs; designers must verify pulse width, duty cycle, and peak V_CE/I_C against the published SOA plot to avoid thermal runaway.