onsemi 1N5337BG

Overview

1N5337BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 4.7 V, ±5% tolerance, maximum zener impedance of 260 Ω at 2 mA test current, and surge rating of 1010 A at 8.3 ms. It operates as a precision voltage reference or shunt regulator in low-voltage power supply feedback paths, overvoltage protection circuits, and analog signal conditioning stages.

For engineers reviewing the 1N5337BG datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.7 V regulation point, 260 Ω dynamic impedance at IZT = 2 mA, 0.44 mA leakage at VR = 15.3 V, 1010 A non-repetitive surge capability, and Pb-free Surmetic 40 plastic package with cathode band polarity marking.

Technical Context

This device uses silicon-oxide passivated junction technology to achieve tight voltage tolerance (±5%), low leakage, and stable regulation under DC and transient conditions. Its thermal design relies on lead-to-ambient conduction, with junction-to-lead thermal resistance of 25 °C/W at TL = 25°C and 3/8″ lead length.

The 1N5337BG exhibits a negative temperature coefficient below 5 V, typical for low-voltage Zeners, and is rated for operation from −65°C to +200°C (non-repetitive pulsed), with maximum continuous junction temperature of +150°C. It meets Class 3 ESD immunity (>16 kV HBM) and supports robust surge handling per JEDEC standards.

Key Specifications

Pinout & Package

Package: Axial-lead Surmetic 40 plastic case (JEDEC Case 017AA), Pb-free, void-free transfer-molded thermosetting material. Cathode identified by single black band. Mounting position unrestricted; leads solderable per IPC-J-STD-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5337B and BZX85C4V7, the 1N5337BG uniquely combines Pb-free compliance, 5 W power handling, and sub-300 Ω dynamic impedance-making it the sole option for RoHS-compliant, high-energy shunt regulation in industrial power supplies.

Availability

1N5337BG is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and test equipment requiring stable component supply with full RoHS compliance and traceable sourcing.

Supply support for 1N5337BG 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The 1N53 Series was designed as a high-reliability, high-surge-capability Zener family for mission-critical voltage regulation in harsh environments-emphasizing thermal robustness, ESD resilience, and tight parametric control.

FAQ

What is the exact zener voltage tolerance and test condition for 1N5337BG?

The 1N5337BG has a guaranteed ±5% zener voltage tolerance, meaning its reverse breakdown voltage falls between 4.47 V and 4.94 V when measured at I_ZT = 2 mA, with 40 ±10 ms current application time and mounting contacts located 3/8″ to 1/2″ from the diode body. This tolerance is specified per JEDEC standard for B-suffix devices and confirmed in the onsemi datasheet Rev. 19.

Can 1N5337BG replace 1N5337B in new designs?

Yes, the 1N5337BG is the Pb-free version of 1N5337B and shares identical electrical specifications, thermal characteristics, and mechanical dimensions. The "G" suffix denotes RoHS-compliant packaging, making 1N5337BG the recommended choice for all new designs requiring lead-free assembly while maintaining full functional equivalence to 1N5337B.

What is the maximum continuous power dissipation for 1N5337BG at 75°C ambient?

At 75°C ambient, the 1N5337BG must be derated from its 5 W rating at 25°C using the 40 mW/°C derating factor. This yields 5 W − (75 − 25) × 0.04 W = 3 W maximum continuous power dissipation. Derating ensures junction temperature remains ≤150°C, preserving long-term reliability and regulation stability.

How does the 1N5337BG perform under repetitive surge conditions?

The 1N5337BG is rated for non-repetitive 8.3 ms surges up to 1010 A. For repetitive pulses, thermal accumulation must be evaluated using Figure 4 (transient thermal resistance) and the duty cycle formula θ_JL(t,D) = D × θ_JL(∞) + (1−D) × θ_JL(t). The 1N5337BG is not characterized for repetitive surges beyond 1 Hz without external heatsinking or current limiting.

Is the 1N5337BG suitable for precision voltage reference applications?

The 1N5337BG provides adequate precision for general-purpose regulation (±5% V_Z, 260 Ω Z_{ZT) but lacks the low tempco (<±0.05%/°C) and tight initial tolerance (±1%) of bandgap references. It is suitable for cost-sensitive 5 V supply regulation or overvoltage clamping, but not for high-resolution ADC references or metrology-grade systems where 1N5337BG's −2 mV/°C tempco introduces measurable drift.}