onsemi 1N5354BRLG

Overview

1N5354BRLG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 17 V (±5%), maximum zener impedance of 70 Ω at 2.5 mA test current, and surge rating of 280 A at 8.3 ms. It operates across −65 °C to +200 °C and features ESD rating >16 kV (HBM), used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the 1N5354BRLG datasheet, pinout, applications, or equivalent options, key selection criteria include its 17 V nominal zener voltage, 70 Ω dynamic impedance at IZT = 2.5 mA, 280 A surge capability, Pb-free Surmetic 40 package, and ±5% tolerance-critical for stable reference design in industrial DC-DC converters and analog sensor biasing.

Technical Context

The 1N5354BRLG implements a silicon-oxide passivated junction for stable reverse breakdown behavior and low leakage. Its thermal design relies on junction-to-lead resistance (θJL = 25 °C/W) and lead-length-dependent derating, enabling reliable operation up to 150 °C under DC conditions.

It delivers regulated voltage via controlled avalanche breakdown, with specified test conditions including 40 ±10 ms current application prior to measurement and mounting contacts located 3/8″–1/2″ from the diode body. Voltage regulation is verified at both 10% and 50% of IZM.

Key Specifications

Pinout & Package

Package: Axial-lead Surmetic 40 (Case 017AA), void-free transfer-molded thermosetting plastic with corrosion-resistant leads and cathode band polarity marking. Lead temperature limit: 260 °C for 10 s at 1/16″ from case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5354BRLG, the 1N5354B lacks Pb-free compliance and requires SnPb soldering, while MMSZ5246B trades surge robustness and thermal capacity for miniaturization-making 1N5354BRLG optimal for high-reliability, high-energy clamping where axial lead mechanical stability and 5 W power handling are essential.

Availability

1N5354BRLG is available at Aetrix Electronics and suitable for industrial power supplies, automotive protection circuits, and high-temperature sensor references requiring stable component supply and long-lifecycle support.

Supply support for 1N5354BRLG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 1N53 Series belongs to onsemi's Surmetic Zener regulator product line, engineered for high-power, high-reliability voltage reference and transient suppression in harsh-environment applications demanding wide temperature range and robust surge immunity.

FAQ

What is the nominal zener voltage and tolerance of the 1N5354BRLG?

The 1N5354BRLG has a nominal zener voltage of 17 V with a tolerance of ±5%, corresponding to a guaranteed range of 16.15 V to 17.85 V at I_ZT = 2.5 mA. This tight tolerance is achieved through silicon-oxide passivation and 100% electrical screening per onsemi's 1N53 Series specification. The 1N5354BRLG is rated for use in precision reference circuits where stable regulation under varying temperature and current conditions is required.

What is the maximum surge current rating for the 1N5354BRLG and under what conditions?

The 1N5354BRLG is rated for a maximum non-repetitive surge current of 280 A at a pulse width of 8.3 ms, per IEC/EN 61000-4-5 surge test methodology. This rating assumes single-event, square-wave excitation with junction temperature maintained below 150 °C. The 1N5354BRLG achieves this performance via its 5 W power capability and optimized thermal path in the Surmetic 40 axial package, making it suitable for load-dump and lightning-transient suppression.

How does the 1N5354BRLG differ from the non-Pb-free 1N5354B variant?

The 1N5354BRLG uses a Pb-free terminations and packaging compliant with RoHS Directive 2011/65/EU, whereas the 1N5354B employs SnPb leads. Electrically and thermally, both share identical specifications-including 17 V nominal V_Z, 70 Ω Z_ZT, and 5 W power rating-but the 1N5354BRLG requires lead-free reflow profiles (peak 260 °C). The 1N5354BRLG is the recommended version for new designs targeting environmental compliance and modern assembly lines.

What is the zener impedance of the 1N5354BRLG and why does it matter in circuit design?

The 1N5354BRLG has a maximum zener impedance (Z_ZT) of 70 Ω measured at I_ZT = 2.5 mA. This parameter directly determines how much the output voltage varies with changes in zener current-lower Z_ZT yields tighter regulation. In practice, this allows the 1N5354BRLG to maintain stable reference voltage in feedback loops of switching regulators where load transients cause current fluctuations, ensuring consistent system performance without additional filtering.

Can the 1N5354BRLG be used in high-temperature environments such as automotive engine compartments?

Yes, the 1N5354BRLG is rated for operation from −65 °C to +200 °C, with DC operation up to +150 °C and pulsed conditions permitted up to +200 °C. Its Surmetic 40 package and silicon-oxide passivated junction ensure reliability under thermal cycling and humidity exposure. When deployed in engine compartment applications, the 1N5354BRLG must be mounted with lead lengths ≥3/8″ to meet thermal resistance (θ_JL = 25 °C/W) and avoid exceeding junction limits-confirming its suitability for automotive load-dump protection and sensor biasing.