onsemi 1N5374BG

Overview

1N5374BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 75 V, ±5% tolerance, 20 Ω maximum zener impedance at 1 mA test current, and 1.6 A maximum surge current (8.3 ms). It operates across −65 °C to +200 °C and serves as a precision voltage reference or overvoltage clamp in DC power supply regulation circuits.

For engineers reviewing the 1N5374BG datasheet, pinout, applications, or equivalent options, key selection criteria include its 75 V nominal breakdown voltage, 620 mA maximum DC zener current, Pb-free Surmetic 40 plastic package, and Class 3 ESD rating (>16 kV HBM).

Technical Context

The 1N5374BG uses a silicon-oxide passivated junction for stable voltage regulation under steady-state and transient conditions. Its thermal design relies on junction-to-lead conduction (θ_JL = 25 °C/W), with derating starting above 25 °C at 40 mW/°C.

It exhibits a positive temperature coefficient typical of high-voltage Zeners (≈+0.08 %/°C above 50 V), enabling predictable drift in temperature-critical references. The device supports non-repetitive surge currents up to 1.6 A at 8.3 ms pulse width per JEDEC standards.

Key Specifications

Pinout & Package

1N5374BG is housed in an axial-lead, transfer-molded plastic package (Case 017AA) with cathode indicated by a band. Leads are solderable per 260 °C / 10 s standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5374BG, the 1N5374B lacks RoHS compliance but offers identical performance in legacy systems, while BZX85C75 trades power handling and surge capability for smaller footprint and metal-can EMI rejection-neither is pin-compatible, and both require layout revision.

Availability

1N5374BG is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU clamping, and test equipment voltage calibration requiring stable component supply and full RoHS compliance.

Supply support for 1N5374BG 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 portfolio, engineered for high-reliability voltage regulation in harsh-environment power systems where precision, surge resilience, and long-term stability are critical.

FAQ

What is the zener voltage tolerance of the 1N5374BG?

The 1N5374BG has a ±5% zener voltage tolerance, with a specified range of 71.25 V to 78.75 V at 1 mA test current (I_ZT). This tolerance is guaranteed per JEDEC standards and applies to all units marked with the "B" suffix. The 1N5374BG achieves this tight tolerance via silicon-oxide passivated junction processing, ensuring consistent regulation across production lots without post-manufacture sorting.

Can the 1N5374BG be used in surface-mount designs?

No, the 1N5374BG is exclusively offered in an axial-lead, through-hole Surmetic 40 package (Case 017AA) and is not available in SMD variants. Its mechanical outline requires 0.330–0.350 inch body length and 1.000–1.250 inch lead length, making it incompatible with reflow or wave soldering processes designed for SMT components. For surface-mount alternatives, engineers should evaluate the MMBZ5274B or similar SOD-123 devices-but those differ in power rating and thermal behavior.

What is the maximum allowable junction temperature for continuous operation of the 1N5374BG?

The 1N5374BG supports continuous operation up to +150 °C junction temperature under DC conditions, as stated in Note 1 of the datasheet. At pulsed or low-duty-cycle operation, it may withstand up to +200 °C briefly-however, sustained operation above 150 °C risks accelerated parameter drift and reduced lifetime. Thermal design must ensure T_J = T_L + θ_JL × P_D remains within this limit, using measured lead temperature (T_L) and the rated 25 °C/W junction-to-lead thermal resistance.

How does the 1N5374BG's surge rating compare to standard 1 W Zeners?

The 1N5374BG delivers 1.6 A peak surge current at 8.3 ms-over 10× higher than typical 1 W Zeners like the 1N4733A (≈120 mA). This is enabled by its 5 W steady-state rating, robust silicon die geometry, and optimized thermal mass in the Surmetic 40 package. Unlike low-power Zeners that fail catastrophically under surge, the 1N5374BG maintains regulation integrity across thousands of such events when properly heatsinked, making it suitable for industrial motor drive snubbers and automotive load-dump protection.

Is the 1N5374BG compatible with lead-free soldering processes?

Yes, the 1N5374BG is explicitly qualified for lead-free soldering: its leads are readily solderable at 260 °C for 10 seconds at 1/16 inch from the case, per the manufacturer's specification. The "G" suffix confirms Pb-free construction, including matte tin plating compliant with J-STD-609A Class 3. No special preheat or cooling profiles are required beyond standard IPC-J-STD-020 guidelines for plastic-encapsulated devices, and the package remains void-free after reflow.