onsemi 1N5948BRL

Overview

1N5948BRL from onsemi is a 3 W axial-lead Zener diode in DO-41 (Case 59) package, rated for 91 V nominal Zener voltage at 200 mA test current, with 4.1 Ω maximum Zener impedance and ±5% tolerance. It delivers stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and precision reference applications across industrial and automotive systems.

For engineers reviewing the 1N5948BRL datasheet, pinout, applications, or equivalent options, this device serves as a high-voltage, Pb-free, surge-rated Zener regulator requiring verification of thermal derating, leakage current at VR = 69.2 V, and compatibility with 3/8″ lead-length mounting constraints.

Technical Context

The 1N5948BRL operates as a silicon-oxide passivated junction Zener diode optimized for steady-state regulation and transient surge suppression. Its design supports 98 W non-repetitive surge capability at 1 ms and maintains ≤0.25 μA reverse leakage at VR = 69.2 V, enabling reliable clamping in DC power rails.

Thermal performance is defined by junction-to-lead resistance (θ_JL) and lead-length–dependent derating: full 3 W dissipation is only guaranteed at TL = 75°C with 3/8″ leads, dropping to 1 W at TA = 50°C. Polarity is marked by a cathode band, and soldering must not exceed 260°C for 10 seconds at 1/16″ from case.

Key Specifications

Pinout & Package

Package: DO-41 (Case 59), axial-lead, transfer-molded thermosetting plastic with corrosion-resistant leads and cathode polarity band. Dimensions: A = 4.10–5.20 mm length, B = 2.00–2.70 mm diameter, D = 0.71–0.86 mm lead diameter, K = 25.40 mm overall length.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with 1N5948BRL, the 1N5948B offers identical performance in a different packaging format, while MMBZ5267BLT1G trades power handling for miniaturization-making the 1N5948BRL the sole option for through-hole, high-energy Zener regulation at 91 V.

Availability

1N5948BRL is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller input stages requiring stable component supply and long-term obsolescence management.

Supply support for 1N5948BRL 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 supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N5913B Series is part of onsemi's legacy Zener regulator portfolio designed for high-reliability, high-surge, through-hole voltage reference and protection applications across harsh-environment electronics.

FAQ

What is the maximum steady-state power dissipation for 1N5948BRL at 75°C lead temperature?

The 1N5948BRL has a maximum steady-state power dissipation of 3 W when measured at TL = 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 24 mW/°C. This rating assumes proper heat sinking via the cathode lead and is critical for maintaining long-term reliability in power supply feedback networks using the 1N5948BRL.

Does 1N5948BRL meet RoHS requirements?

Yes, the 1N5948BRL is Pb-free and complies with RoHS Directive 2011/65/EU. The "G" suffix in its full ordering code (1N5948BRL, G) explicitly denotes the Pb-free package variant, verified per onsemi's Soldering and Mounting Techniques Reference Manual. This ensures compatibility with lead-free reflow and wave soldering processes used in modern electronics manufacturing for the 1N5948BRL.

What is the reverse leakage current specification for 1N5948BRL at 69.2 V?

The 1N5948BRL exhibits ≤0.25 μA reverse leakage current at VR = 69.2 V (80% of nominal V_Z). This value is guaranteed across the full operating temperature range and directly impacts accuracy in high-impedance voltage divider or bias networks where the 1N5948BRL serves as a reference node.

Can 1N5948BRL be used as a direct replacement for 1N5948B in production?

Yes, the 1N5948BRL is electrically and mechanically identical to 1N5948B-same DO-41 package, same Zener characteristics, same thermal limits-differing only in packaging format (tape-and-reel vs. bulk box). No layout or circuit changes are needed when substituting 1N5948BRL for 1N5948B in automated assembly lines or field-replaceable modules using the 1N5948BRL.

What is the Zener impedance of 1N5948BRL at its test current?

The 1N5948BRL has a maximum Zener impedance (Z_ZT) of 4.1 Ω at I_ZT = 200 mA and TL = 30°C. This low dynamic resistance ensures minimal output voltage variation under load transients, making the 1N5948BRL suitable for precision regulation tasks where stability under changing current demand is critical.