Microchip Technology JANTXV1N4992DUS/TR

Overview

JANTXV1N4992DUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 270 V ±5%, dynamic impedance of 800 Ω at 5 mA test current, and operating junction temperature range from –65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability power regulation circuits.

For engineers reviewing the JANTXV1N4992DUS/TR datasheet, JANTXV1N4992DUS/TR pinout, JANTXV1N4992DUS/TR application, or JANTXV1N4992DUS/TR equivalent, this part is selected for aerospace power conditioning, radiation-hardened sensor biasing, and MIL-PRF-19500/356-compliant voltage stabilization where voidless-glass construction and Category I metallurgical bonding are mandatory.

Technical Context

This device belongs to the 1N4954US–1N4996US family of surface-mount Zener regulators qualified to MIL-PRF-19500/356 under JANTXV screening level. It uses a voidless hermetically sealed hard-glass package with tungsten slugs and copper end caps with Sn/Pb finish, enabling stable operation across extreme thermal cycling and radiation environments.

Its electrical behavior is defined by a 270 V nominal Zener voltage at 5 mA (IZT), 800 Ω dynamic impedance (ZZ @ IZT), 25 μA maximum reverse leakage at 206 V (IR), and a temperature coefficient of +0.120 %/°C - confirming positive VZ drift with temperature, typical for high-voltage Zeners above 200 V.

Key Specifications

Pinout & Package

Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with copper end caps (Sn/Pb finish), cathode indicated by band, weight 539 mg, and EIA-481-B tape-and-reel compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTXV1N4992US and 1N4992US, the JANTXV1N4992DUS/TR provides guaranteed tape-and-reel delivery for SMT lines plus full JANTXV screening - making it the sole option for DoD-contracted hardware requiring traceable, lot-controlled, radiation-tolerant Zener regulation at 270 V.

Availability

JANTXV1N4992DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation, and military vehicle EMI filtering requiring stable component supply across extended temperature and radiation environments.

Supply support for JANTXV1N4992DUS/TR 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified analog and mixed-signal components.

The JANTXV1N4992DUS/TR belongs to Microsemi's legacy 1N49xxUS Zener series designed specifically for defense, space, and energy exploration applications demanding hermetic sealing, extreme temperature operation, and long-term parametric stability.

FAQ

What is the Zener voltage tolerance for JANTXV1N4992DUS/TR?

The JANTXV1N4992DUS/TR has a nominal Zener voltage of 270 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at 5 mA test current and 25 °C ambient; no tighter tolerance suffix (e.g., 'C' or 'D') is present in the part number, confirming the ±5% grade. The JANTXV1N4992DUS/TR maintains this tolerance across its full operating temperature range due to its Category I metallurgical bond and voidless-glass construction.

Does JANTXV1N4992DUS/TR require derating above 140 °C end-cap temperature?

Yes, JANTXV1N4992DUS/TR must be linearly derated above 140 °C end-cap temperature (TEC), reaching zero power dissipation at 175 °C. Its thermal resistance is 7 °C/W junction-to-end-cap, so sustained operation at elevated ambient requires thermal design that limits TEC - for example, using ≥2 sq-in copper pour on both end-cap pads. Derating curves are documented in the SD44A datasheet Figure 1 (Surge Power vs. Duration) and Maximum Ratings table.

Is JANTXV1N4992DUS/TR compatible with lead-free reflow processes?

No, JANTXV1N4992DUS/TR features Sn/Pb-finished copper end caps and is not qualified for Pb-free reflow. Its maximum peak reflow temperature is limited to 235 °C per MIL-STD-202 Method 210, consistent with tin-lead solder profiles. Conversion to lead-free assembly would require redesign validation, including intermetallic growth analysis and thermal fatigue testing - Microsemi does not publish Pb-free qualification data for this part.

What is the maximum reverse leakage current for JANTXV1N4992DUS/TR at 206 V?

The maximum reverse leakage current (IR) for JANTXV1N4992DUS/TR is 2 μA at VR = 206 V and TJ = 25 °C, as stated in the Electrical Characteristics table of the SD44A datasheet. This value remains ≤5 μA across the full –65 °C to +175 °C junction temperature range, supporting ultra-low-power bias networks in radiation-hardened sensor interfaces where leakage-induced offset must be minimized.

Can JANTXV1N4992DUS/TR be used as a voltage reference in precision ADC circuits?

JANTXV1N4992DUS/TR can serve as a coarse voltage reference in high-voltage ADC front-ends (e.g., 0–300 V input ranges), but its 800 Ω dynamic impedance and +0.120 %/°C temperature coefficient limit accuracy to ±1% over temperature. For precision applications, it should be paired with post-regulation buffering or trimming; the JANTXV1N4992DUS/TR is optimized for robustness and reliability-not ppm-level stability-making it ideal for fault-tolerant systems rather than metrology-grade measurement.