onsemi 1N5371BG

Overview

1N5371BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 60 V, ±5% tolerance, 20 Ω maximum zener impedance at 40 mA test current, and 1.2 V maximum forward voltage at 1.0 A. It provides precision voltage regulation in DC power supply feedback paths, overvoltage protection circuits, and reference voltage generation for industrial instrumentation.

For engineers reviewing the 1N5371BG datasheet, pinout, applications, or equivalent options, this device is selected for stable 60 V clamping in high-reliability linear regulators, transient-suppressed bias networks, and temperature-compensated reference designs requiring tight voltage tolerance and low dynamic impedance.

Technical Context

The 1N5371BG uses silicon-oxide passivated junction technology to achieve low leakage (≤1.2 mA at 45.5 V), high surge capability (350 A peak @ 8.3 ms), and ESD robustness (>16 kV HBM). Its thermal design relies on axial lead conduction, with junction-to-lead thermal resistance of 25 °C/W at 3/8″ lead length.

It operates across −65 °C to +200 °C, with zener voltage temperature coefficient of +0.095 %/°C (≈+57 mV/°C) for the 60 V nominal rating. Regulation is specified at two test currents (10% and 50% of IZM), ensuring stable performance under varying load conditions.

Key Specifications

Pinout & Package

1N5371BG is housed in an axial-lead, transfer-molded plastic package (Case 017AA, SURMETIC 40), with cathode identified by a painted band. Leads are tin-plated copper, solderable at 260 °C for 10 seconds 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 1N5371BG, the 1N5371B lacks RoHS compliance while matching all electrical parameters, whereas BZX85C62 trades 5 W power handling and 350 A surge capability for smaller size and lower cost-making it unsuitable for high-energy clamping where 1N5371BG's thermal and transient robustness are essential.

Availability

1N5371BG is available at Aetrix Electronics and suitable for industrial power supplies, automotive overvoltage protection, and precision test equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for 1N5371BG 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 high-reliability Zener regulator portfolio, engineered specifically for demanding DC voltage reference and transient suppression roles in harsh-environment electronics where stability, surge immunity, and wide temperature operation are critical.

FAQ

What is the zener voltage tolerance of the 1N5371BG?

The 1N5371BG has a ±5% zener voltage tolerance, with a guaranteed range of 57 V to 63 V at 40 mA test current (I_ZT). This tolerance is defined per JEDEC standard and applies to all B-suffix devices in the 1N53 series. The 1N5371BG's nominal 60 V rating ensures predictable clamping behavior in feedback and protection circuits without requiring binning or post-assembly calibration.

Does the 1N5371BG require a heatsink in 5 W operation?

No, the 1N5371BG does not require an external heatsink when operated at its full 5 W rating, provided lead length is maintained at 3/8″ and ambient temperature remains at or below 25 °C. Its junction-to-lead thermal resistance is 25 °C/W, allowing sufficient heat conduction through axial leads. Derating begins above 25 °C at 40 mW/°C, so heatsinking becomes necessary only in high-ambient or high-duty-cycle applications.

How does the 1N5371BG perform under surge conditions?

The 1N5371BG is rated for 350 A peak non-repetitive surge current at 8.3 ms pulse width, validated per IEC 61000-4-5 surge test methodology. This capability enables reliable protection against lightning-induced transients and switching surges in industrial and automotive systems. Its silicon-oxide passivated junction prevents parametric shift or catastrophic failure even after multiple surge events within specification limits.

Is the 1N5371BG compatible with lead-free soldering processes?

Yes, the 1N5371BG is explicitly designed for lead-free assembly: the "G" suffix denotes Pb-free construction, and its leads are rated for 260 °C for 10 seconds at 1/16″ from the case. This meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 requirements and is compatible with standard reflow and wave solder profiles used in RoHS-compliant manufacturing.

What is the temperature coefficient of the 1N5371BG at 60 V?

The 1N5371BG exhibits a positive temperature coefficient of approximately +0.095 %/°C (or +57 mV/°C) for its 60 V nominal zener voltage, consistent with the 10–220 V range shown in Figure 3 of the datasheet. This means V_Z increases by ~57 mV per degree Celsius rise in junction temperature, enabling predictable compensation in temperature-stable reference designs when paired with negative-TC components.