onsemi 1N5993DRL

Overview

1N5993DRL from Motorola is a 500 mW, 5.1 V ±1% tolerance glass-encapsulated Zener diode in DO-204AH (DO-35) package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers stable zener voltage at 5 mA test current with 50 Ω dynamic impedance and operates across –65°C to +200°C.

For engineers reviewing the 1N5993DRL datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, leakage and impedance characteristics, polarity marking, and real-world selection guidance for discrete voltage reference design.

Technical Context

This device functions exclusively in reverse-bias zener breakdown mode, where cathode is held positive relative to anode. Its double-slug, hermetically sealed glass construction ensures stable thermal performance and long-term parameter retention under thermal cycling.

The 1N5993DRL exhibits a nominal temperature coefficient near 0 mV/°C (±2 mV/°C typical for 5.1 V units), enabling minimal drift over temperature. Its 50 Ω zener impedance at 5 mA and 2 µA max reverse leakage at 2 V support tight regulation in low-current reference topologies.

Key Specifications

Pinout & Package

DO-204AH (DO-35) glass package: axial-leaded, hermetically sealed, cylindrical glass body with metallurgically bonded double-slug construction. Cathode identified by single color band. Leads are corrosion-resistant and readily solderable. Maximum soldering temperature: 230°C at 1/16″ from case for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5993BRL and BZX55-C5V1, the 1N5993DRL offers superior initial accuracy and lower dynamic impedance-critical for uncalibrated precision references-while maintaining identical thermal and mechanical interface compatibility.

Availability

1N5993DRL is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference, and switch-mode power supply feedback requiring stable component supply with guaranteed long-term continuity.

Supply support for 1N5993DRL 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

Motorola Semiconductor (now part of ON Semiconductor) pioneered high-reliability discrete semiconductors for automotive, industrial, and military applications, emphasizing rugged packaging and parametric consistency.

The 1N5993DRL belongs to Motorola's legacy 500 mW DO-35 Zener series, engineered for stable voltage reference in thermally demanding environments where hermetic sealing and wide temperature operation are mandatory.

FAQ

What is the exact zener voltage tolerance for 1N5993DRL?

The 1N5993DRL has a nominal zener voltage of 5.1 V with ±1% tolerance, as indicated by the "D" suffix per Motorola's voltage designation standard. This means the actual measured V_Z at I_ZT = 5 mA and T_L = 30°C falls between 5.049 V and 5.151 V. The 1N5993DRL achieves this tighter tolerance through post-process binning and screening, distinguishing it from the ±5% 1N5993BRL variant.

Does 1N5993DRL support operation above 100°C ambient?

Yes, the 1N5993DRL is rated for junction and storage temperatures from –65°C to +200°C. Its DO-204AH glass package and double-slug construction enable reliable operation at lead temperatures up to 75°C continuously (with linear derating above), making it suitable for under-hood automotive or enclosed industrial enclosures where ambient exceeds 100°C-provided thermal design maintains T_L within limits.

What is the maximum reverse leakage current for 1N5993DRL at 2 V?

The maximum reverse leakage current for 1N5993DRL is 2 µA at V_R = 2 V and T_L = 30°C, as specified in Motorola's official electrical characteristics table. This low leakage ensures minimal loading on high-impedance reference nodes and contributes to stable operation in battery-powered systems where quiescent current must be minimized.

How does the zener impedance of 1N5993DRL affect regulation performance?

The 1N5993DRL exhibits 50 Ω dynamic impedance (Z_ZT) at I_ZT = 5 mA, meaning a 1 mA change in zener current causes approximately 50 mV change in output voltage. This value directly impacts regulation accuracy under varying load conditions; lower Z_ZT improves line and load regulation, especially in feedback networks where current excursions are small and predictable.

Is the 1N5993DRL RoHS compliant and lead-free?

The original Motorola 1N5993DRL was manufactured prior to RoHS enforcement and uses lead-based solder and glass encapsulation materials not compliant with current EU RoHS Directive 2011/65/EU. Modern equivalents such as ON Semiconductor's 1N5993DHE3/TR13 are RoHS-compliant and halogen-free; however, the legacy 1N5993DRL itself carries no RoHS certification and should be verified for compliance in new designs requiring regulatory adherence.