Microchip Technology JANTXV1N4956DUS/TR

Overview

JANTXV1N4956DUS/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 8.2 V ±5%, dynamic impedance of 600 Ω at 150 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 aerospace power conditioning circuits.

For engineers reviewing the JANTXV1N4956DUS/TR datasheet, JANTXV1N4956DUS/TR pinout, JANTXV1N4956DUS/TR application, or JANTXV1N4956DUS/TR equivalent, this part's voidless-glass construction, Category I metallurgical bond, MIL-PRF-19500/356 qualification, and radiation-hardened behavior are critical selection criteria in mission-critical analog regulation and protection designs.

Technical Context

This device belongs to the 1N4954US–1N4996US family of surface-mount Zener regulators, designed for stable voltage reference and transient suppression in harsh-environment analog subsystems. Its triple-layer passivation and internal tungsten-slug metallurgical bond ensure long-term reliability under thermal cycling and ionizing radiation exposure.

The JANTXV1N4956DUS/TR operates with a forward voltage of 1.50 V at 1.0 A and exhibits reverse leakage ≤50 μA at 6.2 V, supporting low-power biasing and fail-safe clamping. Its thermal resistance is 7 °C/W (junction-to-end-cap), enabling robust thermal management in compact SMT layouts without forced cooling.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with JANTXV1N4956US and 1N4956US, the JANTXV1N4956DUS/TR uniquely combines tape-and-reel automation readiness, full JANTXV screening, and verified radiation hardness - making it the sole option for production-ready, flight-qualified 8.2 V Zener regulation in defense and space platforms.

Availability

JANTXV1N4956DUS/TR is available at Aetrix Electronics and suitable for avionics power regulation, satellite bus voltage reference, and turbine engine control requiring stable component supply across extended temperature and radiation environments.

Supply support for JANTXV1N4956DUS/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 analog and mixed-signal components for aerospace, defense, and industrial markets.

The JANTXV1N4956DUS/TR belongs to Microsemi's military-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in mission-critical systems where failure is not an option.

FAQ

What is the Zener voltage tolerance of JANTXV1N4956DUS/TR?

The JANTXV1N4956DUS/TR has a nominal Zener voltage of 8.2 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. This tolerance applies at the test current I_ZT = 150 mA and ambient temperature of 25 °C. No tighter tolerance suffix (e.g., 'C' or 'D') is present in the part number, confirming the ±5% specification for JANTXV1N4956DUS/TR.

Is JANTXV1N4956DUS/TR compatible with lead-free reflow processes?

JANTXV1N4956DUS/TR features Sn/Pb-finished copper end caps and is qualified for traditional eutectic solder reflow profiles. While it can survive peak temperatures up to 220 °C, its Sn/Pb finish is not RoHS-compliant and is not recommended for Pb-free reflow (which requires ≥245 °C). For lead-free assembly, Microsemi recommends verifying process compatibility with actual board-level thermal profiling before production use of JANTXV1N4956DUS/TR.

Does JANTXV1N4956DUS/TR require derating above 140 °C end-cap temperature?

Yes - JANTXV1N4956DUS/TR must be linearly derated above 140 °C end-cap temperature, reaching zero power dissipation at 175 °C, per MIL-PRF-19500/356 requirements. The derating slope is –35.7 mW/°C, calculated from 5 W over 35 °C. This ensures safe operation within the specified junction temperature limit of –65 °C to +175 °C for JANTXV1N4956DUS/TR.

What is the maximum reverse leakage current for JANTXV1N4956DUS/TR?

The maximum reverse leakage current for JANTXV1N4956DUS/TR is 50 μA at 6.2 V (75% of nominal Zener voltage) and 25 °C, as defined in the "Maximum Reverse Leakage Current (I_R)" column of the Electrical Characteristics table. This value remains valid across the full storage temperature range and confirms low standby power consumption in high-impedance clamping configurations using JANTXV1N4956DUS/TR.

How does the "DUS/TR" suffix in JANTXV1N4956DUS/TR affect packaging and handling?

The "DUS/TR" suffix indicates that JANTXV1N4956DUS/TR is supplied in tape-and-reel format compliant with EIA-481-B standards, with voidless-glass "E" (D-5B) packaging and Sn/Pb end-cap finish. The "TR" denotes automated SMT placement readiness, while "DUS" specifies the surface-mount glass Zener variant - distinguishing it from axial-leaded versions like 1N4956. This configuration ensures consistent orientation, static-safe handling, and direct compatibility with high-speed pick-and-place equipment for JANTXV1N4956DUS/TR.