Microchip Technology 1N4698UR-1E3

Overview

1N4698UR-1E3 from Microsemi is a 500 mW surface-mount Zener diode in DO-213AA (SOD80/MLL34) MELF package, rated for 11.0 V nominal Zener voltage at 50 µA test current, ±5% tolerance, with 0.11 V regulation change between 10 µA and 100 µA. It operates across –65 °C to +175 °C and is used for precision low-current voltage reference and regulation in space-constrained analog circuits.

For engineers reviewing the 1N4698UR-1E3 datasheet, 1N4698UR-1E3 pinout, 1N4698UR-1E3 application, or 1N4698UR-1E3 equivalent, key selection criteria include its ultra-low 50 µA Zener test current, hermetically sealed glass construction, MIL-PRF-19500 up-screening capability, RoHS-compliant matte-tin plating, and minimal capacitance (<1.5 pF typical at 0 V).

Technical Context

The 1N4698UR-1E3 implements a silicon Zener junction with metallurgically bonded metal slugs for high thermal reliability and low thermal resistance (100 °C/W junction-to-end cap). Its regulation performance is specified at 50 µA, enabling stable reference generation in micropower systems where leakage and bias current are critical.

Designed for operation in reverse-bias breakdown, it delivers 11.0 V regulation with only 0.11 V variation over a decade of current (10–100 µA), and exhibits ≤0.05 µA reverse leakage at 8.4 V - supporting low-power standby and sensing applications requiring tight voltage stability without active bias circuitry.

Key Specifications

Pinout & Package

DO-213AA (SOD80/MLL34) is a cylindrical MELF-style hermetically sealed glass package with two metallized end caps. Polarity is marked by a cathode band; the banded end is positive during Zener regulation (reverse-biased operation).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C11LT1G and 1N4740A, the 1N4698UR-1E3 uniquely combines hermetic MELF packaging, 50 µA regulation current, and MIL-PRF-19500 up-screening - making it the only choice for ultra-low-power, high-reliability, and radiation-tolerant Zener reference designs.

Availability

1N4698UR-1E3 is available at Aetrix Electronics and suitable for low-power sensor references, space-constrained voltage clamps, high-reliability analog trim circuits, and downhole instrumentation bias requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N4698UR-1E3 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

Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade analog and mixed-signal components.

The 1N4698UR-1E3 belongs to Microsemi's legacy DO-213AA Zener series designed specifically for applications demanding hermetic sealing, ultra-low test current, and qualification to MIL-PRF-19500 standards.

FAQ

What is the Zener voltage tolerance for 1N4698UR-1E3?

The 1N4698UR-1E3 has a nominal Zener voltage of 11.0 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0240-1 Rev. 2. Tighter 2% and 1% tolerances are available under different part number suffixes (C and D), but the "E3" suffix indicates RoHS-compliant commercial grade with ±5% tolerance. This tolerance applies at 25 °C and I_ZT = 50 µA.

Is 1N4698UR-1E3 suitable for high-temperature environments?

Yes, the 1N4698UR-1E3 is rated for junction and storage temperatures from –65 °C to +175 °C, verified in the Maximum Ratings table. Its hermetically sealed DO-213AA glass package and metallurgical die bonding enable stable operation in extended industrial, aerospace, and downhole applications. Derating begins above 50 °C ambient on FR4 PCBs, per the power derating curve on page 4.

Does 1N4698UR-1E3 require a heatsink for 500 mW operation?

No, the 1N4698UR-1E3 does not require an external heatsink at full 500 mW dissipation when mounted on an FR4 PCB with 1 oz copper and the recommended footprint. Its thermal resistance junction-to-ambient is 250 °C/W under those conditions, resulting in a ~125 °C junction rise at 500 mW - within its 175 °C absolute maximum. However, operation above 50 °C ambient requires linear derating per Figure 1.

What does the "E3" suffix mean in 1N4698UR-1E3?

The "E3" suffix in 1N4698UR-1E3 denotes RoHS-compliant matte-tin plating on the end caps, as defined in the Part Nomenclature section on page 2. It applies only to commercial-grade devices and confirms compliance with JEDEC J-STD-609A Class 3 moisture sensitivity and MIL-STD-750 Method 2026 solderability requirements - critical for lead-free reflow assembly.

Can 1N4698UR-1E3 be used as a substitute for 1N4740A in a 10 V reference design?

No - while both are Zener diodes, the 1N4698UR-1E3 is rated for 11.0 V at 50 µA, whereas the 1N4740A is 10 V at 25 mA. Their regulation characteristics, thermal behavior, and package types differ significantly. Substituting 1N4698UR-1E3 for 1N4740A would shift the reference voltage by +1 V and reduce bias current capability by 500×, potentially destabilizing feedback loops designed for higher current.