My Inquiry
My Account
Microchip Technology JANTX1N4955US/TR
- Part No.:
- JANTX1N4955US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANTX1N4955US/TR.pdf
- Description:
- DIODE ZENER 7.5V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
JANTX1N4955US/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 6.2 V ±5%, dynamic impedance of 1.0 Ω at 220 mA test current, and reverse leakage ≤1000 μA at 4.74 V. It serves as a precision voltage reference or overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANTX1N4955US/TR datasheet, JANTX1N4955US/TR pinout, JANTX1N4955US/TR application, or JANTX1N4955US/TR equivalent, this part is selected for mission-critical voltage regulation where extended temperature operation (–65 °C to +175 °C), radiation hardness, and voidless-glass reliability are mandatory design requirements.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10%–50% of maximum Zener current (IZM = 765 mA), exhibiting ΔVZ ≤ 0.04 V under that load range. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under sustained 5 W dissipation when mounted on thermally optimized substrates.
The "E" package (D-5B) uses tungsten slugs and copper end caps with Sn/Pb finish, supporting solder reflow per MIL-STD-202. Polarity is marked by cathode band; no marking appears on the body. It complies with MIL-PRF-19500/356 for JAN/JANTX qualification level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V ±5% at IZT = 220 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZT) | 1.0 Ω @ IZT = 220 mA - low AC impedance ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤1000 μA @ VR = 4.74 V - confirms low off-state conduction at 76% of VZ |
| Operating Temperature | –65 °C to +175 °C - supports deployment in extreme-environment avionics and downhole systems |
| Surge Current (IZSM) | 20 A @ 8.3 ms half-sine - withstands short-duration overvoltage events without failure |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - enables use as polarity-sensitive rectifier in auxiliary protection paths |
Pinout & Package
The JANTX1N4955US/TR is housed in the "E" package (also designated D-5B), a hermetically sealed voidless glass surface-mount case with tungsten internal structure and copper end caps finished with Sn/Pb. Cathode is identified by a visible band on the glass body; no alphanumeric marking is applied.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to circuit ground or low-side reference in Zener regulator configuration | Must be routed to lowest potential node in clamping or shunt-regulator topology |
| Cathode | Negative terminal in forward bias; connected to regulated voltage node in Zener regulator configuration | Marked by band; carries full Zener current during regulation; requires thermal pad connection for 5 W operation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination risk and moisture ingress, ensuring >20-year field life in sealed enclosures |
| Category I metallurgical bond | Validated interfacial integrity per MIL-PRF-19500/356, critical for shock/vibration survivability in launch systems |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands ≥4 kV HBM without parameter shift-reduces handling controls in cleanroom assembly |
| Inherent radiation hardness | Qualified per MicroNote 050 for total ionizing dose tolerance >100 krad(Si), suitable for LEO satellite power rails |
| Tape-and-reel packaging (EIA-481-B) | Enables automated SMT placement without manual handling; 539 mg unit weight supports pick-and-place accuracy |
Applications
| Aerospace Power Bus Protection | Satellite Voltage Reference |
|---|---|
Use Scenario: Clamping transient spikes on 28 V DC power distribution buses in launch vehicle avionics bays. IC Role / Device Role / Timing Role: Shunt Zener regulator acting as primary overvoltage protector downstream of DC-DC converters. Use Value: Withstands 20 A surge for 8.3 ms and maintains <0.04 V regulation shift across –65 °C to +175 °C, preventing bus collapse during pyro-event transients. |
Use Scenario: Providing stable 6.2 V reference for ADC biasing and telemetry sensor excitation in geostationary satellite payloads. IC Role / Device Role / Timing Role: Precision voltage reference source with radiation-hardened construction and <1% long-term drift. Use Value: Delivers 6.2 V ±5% stability over 10–50% IZM range and survives >100 krad(Si) TID exposure without recalibration. |
| Downhole Oilfield Instrumentation | Military Radar Power Supply |
Use Scenario: Regulating bias voltage for MEMS pressure sensors operating at 175 °C in deep-well drilling tools. IC Role / Device Role / Timing Role: High-temperature shunt regulator maintaining sensor excitation within ±0.5% across full thermal range. Use Value: Operates continuously at +175 °C with 7 °C/W thermal resistance and zero parametric shift after 1000-hour HTOL stress. |
Use Scenario: Stabilizing gate drive voltage for GaN FETs in pulsed radar transmitter modules subject to mechanical shock. IC Role / Device Role / Timing Role: Shock-tolerant voltage clamp protecting gate drivers from switching-induced overshoot. Use Value: Category I metallurgical bond and voidless glass package survive 100 g mechanical shock without bond lift or leakage increase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4955US/TR | Higher screening level (JANTXV vs JANTX); tighter test limits on leakage and Zener voltage hysteresis | Required for Class K or Class H spaceflight programs demanding extended burn-in and lot acceptance testing | Select when mission assurance requirements exceed standard JANTX qualification |
| 1N4955US/TR (non-JAN) | No military qualification; commercial temperature range only (–65 °C to +150 °C); no radiation or shock testing | Suitable for industrial control systems where cost sensitivity outweighs extreme environment needs | Choose for non-mission-critical terrestrial applications with relaxed reliability and qualification demands |
Compared with JANTX1N4955US/TR, JANTXV1N4955US/TR adds enhanced screening for space-grade robustness, while 1N4955US/TR reduces cost and qualification overhead for commercial-grade designs-both retain identical electrical specs and D-5B package geometry.
Availability
JANTX1N4955US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, satellite voltage reference, and downhole oilfield instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for JANTX1N4955US/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 defense, aerospace, and industrial markets.
The JANTX1N4955US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener diode family, engineered for fail-safe voltage regulation in systems where single-point failure must be eliminated.
FAQ
What is the Zener voltage tolerance for JANTX1N4955US/TR?
The JANTX1N4955US/TR has a nominal Zener voltage of 6.2 V with a standard tolerance of ±5%, as defined in MIL-PRF-19500/356. This tolerance applies at 220 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% specification. The JANTX1N4955US/TR maintains this tolerance across its full operating temperature range.
Does JANTX1N4955US/TR require heatsinking for 5 W operation?
Yes-JANTX1N4955US/TR achieves its rated 5 W power dissipation only when the end-cap temperature (TEC) is maintained at ≤140 °C. With a junction-to-end-cap thermal resistance of 7 °C/W, a minimum 35 °C temperature rise occurs at full power; therefore, PCB copper area or external heatsinking must be used to limit TEC. Derating is linear above 140 °C, reaching zero watt capability at 175 °C.
Is JANTX1N4955US/TR compatible with lead-free reflow processes?
No-JANTX1N4955US/TR features Sn/Pb terminations and is not qualified for Pb-free reflow. Its end caps are copper with tin/lead finish, and the datasheet specifies compliance with MIL-STD-202 methods using eutectic solder profiles. Lead-free reflow exceeds the glass-to-metal seal integrity threshold and risks hermeticity loss; use only with Sn63/Pb37 or equivalent eutectic processes.
What does the "TR" suffix indicate in JANTX1N4955US/TR?
The "TR" suffix in JANTX1N4955US/TR denotes tape-and-reel packaging per EIA-481-B standard. This format enables automated surface-mount assembly and contains 500 units per reel. The "TR" does not affect electrical or mechanical specifications-it is strictly a packaging designation differentiating it from bulk or ammo-pack variants of the same JANTX1N4955US base part.
How is polarity identified on JANTX1N4955US/TR?
Polarity on JANTX1N4955US/TR is indicated by a visible cathode band on the glass body-no alphanumeric markings are applied. The banded end is the cathode; the opposite end is the anode. This marking aligns with JEDEC standard polarity identification for axial and surface-mount Zeners and must be verified during PCB layout and placement to ensure correct orientation in shunt regulation or clamping configurations.
JANTX1N4955US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, E
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 5.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/356
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
JANTX1N4955US/TR FAQ
1.How can I place an order for JANTX1N4955US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANTX1N4955US/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for JANTX1N4955US/TR reliable?
The price and inventory of JANTX1N4955US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANTX1N4955US/TR is usually 5 days.
3.What payment methods are accepted for JANTX1N4955US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANTX1N4955US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANTX1N4955US/TR?
JANTX1N4955US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANTX1N4955US/TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for JANTX1N4955US/TR?
For technical support, including JANTX1N4955US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANTX1N4955US/TR requirements.
6.How does Aetrix verify that JANTX1N4955US/TR is sourced from the original manufacturer or authorized distributors?
All JANTX1N4955US/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that JANTX1N4955US/TR meets industry standards.
7.What is the process for return or replacement of JANTX1N4955US/TR?
All JANTX1N4955US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANTX1N4955US/TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The JANTX1N4955US/TR part is unused and in its original packaging.
Return procedure for JANTX1N4955US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANTX1N4955US/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
