Microchip Technology JANTX1N4969DUS/TR

Overview

JANTX1N4969DUS/TR from Microsemi is a military-qualified, hermetically sealed surface-mount Zener diode with 30 V nominal Zener voltage, 5 W power rating at 140 °C end-cap temperature, ±1% tolerance (D suffix), and 8 Ω dynamic impedance at 40 mA test current. It operates from −65 °C to +175 °C and delivers stable voltage regulation in high-reliability power supply reference and overvoltage protection circuits.

For engineers reviewing the JANTX1N4969DUS/TR datasheet, JANTX1N4969DUS/TR pinout, JANTX1N4969DUS/TR application, or JANTX1N4969DUS/TR equivalent, this part serves as a precision, radiation-hardened, voidless-glass Zener regulator for aerospace, defense, and downhole electronics where failure tolerance and thermal robustness are mandatory.

Technical Context

This device belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring triple-layer passivation and Category I internal metallurgical bonds. Its voidless hermetic glass construction ensures zero moisture ingress and long-term parameter stability under extreme thermal cycling and radiation exposure.

The JANTX1N4969DUS/TR exhibits a temperature coefficient of +0.090 %/°C and maintains regulation across 10%–50% of IZM (5.5 mA to 27.5 mA), with forward voltage ≤1.50 V at 1.0 A and reverse leakage ≤2 μA at 24 V - confirming suitability for low-drift biasing and precision clamping in analog front-ends.

Key Specifications

Pinout & Package

Package: Hermetically sealed voidless hard glass case with tungsten slugs and copper end caps (Sn/Pb finish); marked with cathode band; "E" package (also known as "D-5B"); 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 voltage regulation applications.

Compared with JANTX1N4969DUS/TR, the JANTXV variant adds enhanced screening for ultra-high-reliability missions, while the 1N4969US offers identical regulation performance at lower cost and reduced environmental qualification - enabling tiered sourcing based on system criticality.

Availability

JANTX1N4969DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole telemetry reference, and military radar bias supply requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for JANTX1N4969DUS/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-grade analog and discrete components.

The JANTX1N4969DUS/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener diode family, engineered for fail-safe voltage regulation in defense, space, and energy exploration systems where parameter stability under stress is non-negotiable.

FAQ

What is the Zener voltage tolerance for JANTX1N4969DUS/TR?

The JANTX1N4969DUS/TR has a nominal Zener voltage of 30 V with ±1% tolerance, indicated by the "D" suffix in the part number. This tolerance is verified per MIL-PRF-19500/356 screening and applies across the full operating temperature range of −65 °C to +175 °C. The JANTX1N4969DUS/TR achieves this tight tolerance via process-controlled doping and hermetic voidless-glass packaging that prevents post-manufacture drift.

Does JANTX1N4969DUS/TR require heatsinking in 5 W operation?

JANTX1N4969DUS/TR is rated for 5 W dissipation at an end-cap temperature (T_EC) of 140 °C, with thermal resistance of 7 °C/W junction-to-end-cap. Heatsinking is not required if PCB copper area and ambient conditions maintain T_EC ≤140 °C; however, for sustained 5 W operation above 85 °C ambient, a minimum 1-in² 2-oz copper pad with thermal vias is recommended. Derating begins linearly above 140 °C to zero at 175 °C.

Is JANTX1N4969DUS/TR compatible with lead-free reflow processes?

JANTX1N4969DUS/TR features Sn/Pb (tin/lead) terminations and is not qualified for Pb-free reflow. Its maximum peak reflow temperature is 235 °C per MIL-STD-202 Method 210, and exceeding this risks compromising the hermetic glass seal. For lead-free assembly, Microsemi recommends the JANTX1N4969DUS/TR be soldered using SnPb paste and profile; alternative Pb-free qualified Zeners must be selected separately.

How does the radiation hardness of JANTX1N4969DUS/TR compare to commercial Zeners?

JANTX1N4969DUS/TR exhibits inherent radiation hardness documented in Microsemi MicroNote 050, with no parameter degradation up to 100 krad(Si) total ionizing dose. Commercial Zeners lack this characterization and typically fail catastrophically above 5 krad(Si). The JANTX1N4969DUS/TR achieves this via voidless-glass encapsulation and Category I metallurgical bonding - making it suitable for unshielded nuclear instrumentation and LEO satellite payloads.

Can JANTX1N4969DUS/TR replace axial-leaded 1N4969 in existing designs?

JANTX1N4969DUS/TR uses the surface-mount "E" (D-5B) package and is not a direct replacement for axial-leaded 1N4969 due to different mechanical form factor, thermal path, and mounting method. While electrical parameters match, PCB layout, thermal management, and assembly process must be redesigned. The axial version is designated 1N4969 (no "US" suffix); JANTX1N4969DUS/TR requires SMT placement and reflow, not through-hole insertion.