My Inquiry
My Account
Microchip Technology JANS1N4987US/TR
- Part No.:
- JANS1N4987US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4987US/TR.pdf
- Description:
- DIODE ZENER 160V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
JANS1N4987US/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 160 V at 8 mA test current, ±5% tolerance, and designed for high-reliability voltage regulation in aerospace, defense, and downhole instrumentation systems.
For engineers reviewing the JANS1N4987US/TR datasheet, JANS1N4987US/TR pinout, JANS1N4987US/TR application, or JANS1N4987US/TR equivalent, this part requires attention to its voidless-glass package thermal limits (TEC = 140 °C), Category I metallurgical bond, radiation-hardened construction, and MIL-PRF-19500/356 qualification status.
Technical Context
This device operates as a precision shunt voltage regulator in reverse-biased breakdown mode, delivering stable 160 V reference over wide temperature (−65 °C to +175 °C) and current (10%–50% of IZM) ranges. Its dynamic impedance is 350 Ω at IZT = 8 mA and 1650 Ω near knee (IZK = 5 mA), enabling predictable regulation under varying load conditions.
The JANS1N4987US/TR uses a tungsten-slug, voidless hard-glass case with copper end caps and Sn/Pb finish, conforming to "E" (D-5B) mechanical outline. It exhibits −0.105 %/°C temperature coefficient and withstands 8.3 ms surge currents up to 0.70 A, per MIL-STD-750 Method 1020 ESD testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 160 V at IZT = 8 mA - defines precise regulation point for biasing or reference circuits |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load before derating begins |
| Dynamic Impedance ZZT | 350 Ω @ IZT = 8 mA - determines output voltage variation under load transients |
| Max Reverse Leakage IR | 2 μA @ VR = 121.6 V - ensures minimal parasitic current in high-impedance sensing nodes |
| Temp Coefficient αVZ | −0.105 %/°C - quantifies voltage drift across operating temperature range |
| Surge Current IZSM | 0.70 A @ 8.3 ms - supports transient overvoltage clamping without failure |
| Forward Voltage VF | 1.50 V @ 1.0 A - defines conduction loss during forward-bias fault conditions |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with copper end caps and Sn/Pb finish; cathode indicated by band; polarity-critical for correct reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side terminal in shunt configuration | Connected to system ground or lowest potential node; carries full regulated current |
| Cathode | High-side terminal in shunt configuration | Banded end; connected to input rail; establishes regulated voltage at cathode-to-anode drop |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/356 Qualified (JANS) | Meets Level 1 screening for space-grade reliability including burn-in, thermal shock, and life test |
| Voidless Hermetic Glass Construction | Eliminates internal delamination risk under thermal cycling and high-humidity environments |
| Category I Metallurgical Bond | Ensures robust interfacial integrity between silicon die and tungsten slug under mechanical stress |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands human-body-model discharges without parameter shift or catastrophic failure |
| Radiation Hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for low-earth orbit missions |
Applications
| Aerospace Power Conditioning | Downhole Instrumentation |
|---|---|
|
Use Scenario: Regulating reference voltage for ADC front-end circuitry in satellite telemetry modules exposed to extreme thermal gradients. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 160 V bias for high-voltage sensor signal conditioning. Use Value: Maintains <±0.5% output stability across −65 °C to +175 °C, eliminating recalibration needs during orbital thermal cycles. |
Use Scenario: Overvoltage protection and voltage clamping in logging-while-drilling (LWD) tools operating at 175 °C ambient. IC Role / Device Role / Timing Role: Transient voltage suppressor and precision clamp in high-temperature DC-DC feedback loops. Use Value: Survives 1000+ thermal cycles between −65 °C and +175 °C without parameter drift or hermeticity loss. |
| Defense Avionics | Nuclear Monitoring Systems |
|
Use Scenario: Providing fail-safe voltage reference for flight control FPGA configuration memory retention circuits. IC Role / Device Role / Timing Role: Redundant Zener reference in triple-modular-redundancy (TMR) power supervision subsystems. Use Value: Zero latent defects per MIL-HDBK-217F prediction model due to JAN-level screening and hermetic packaging. |
Use Scenario: Biasing ionization chamber detectors in reactor core monitoring systems requiring long-term calibration stability. IC Role / Device Role / Timing Role: High-stability 160 V reference source for charge-integration amplifiers. Use Value: Radiation-induced parameter shift <0.1% after 100 krad(Si), validated per MicroNote 050. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4987US | Same electrical specs but qualified to JANTXV level (lower screening rigor than JANS); no radiation hardness documentation | Suitable for non-space avionics where TID tolerance is not required | Select JANTXV1N4987US when cost sensitivity outweighs radiation assurance requirements |
| 1N4987US | Commercial-grade version; lacks MIL-PRF-19500 qualification, no ESD/radiation data, wider temp range not guaranteed | Acceptable for industrial controls with ambient ≤125 °C and no mission-critical reliability demands | Choose 1N4987US only for prototyping or non-mission-critical ground-based systems |
Compared with JANS1N4987US/TR, JANTXV1N4987US offers reduced screening cost but no radiation assurance, while 1N4987US omits all military qualifications and environmental guarantees-making JANS1N4987US/TR the sole choice for space-qualified, radiation-tolerant, and ESD-immune 160 V regulation.
Availability
JANS1N4987US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation, defense avionics, and nuclear monitoring systems requiring stable component supply under extended lifecycle and obsolescence management.
Supply support for JANS1N4987US/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with deep expertise in radiation-hardened and hermetic packaging technologies.
The JANS1N4987US/TR belongs to Microsemi's legacy MIL-PRF-19500/356 Zener series, engineered specifically for voltage regulation in mission-critical systems where failure is not an option-emphasizing hermeticity, thermal resilience, and radiation tolerance.
FAQ
What is the Zener voltage tolerance for JANS1N4987US/TR?
JANS1N4987US/TR has a nominal Zener voltage of 160 V with a standard tolerance of ±5%, consistent with MIL-PRF-19500/356 requirements for JANS-qualified parts. No tighter tolerance suffix (e.g., 'C' or 'D') is applied to this specific variant, so the full ±5% band applies across its operating temperature range.
Is JANS1N4987US/TR compatible with lead-free solder reflow processes?
JANS1N4987US/TR features Sn/Pb-finished copper end caps and is specified for use with conventional eutectic solder profiles. While it can survive peak reflow temperatures up to 235 °C for short durations, Microsemi does not qualify it for Pb-free assembly; using lead-free processes may compromise hermetic seal integrity and voidless glass bond reliability.
Does JANS1N4987US/TR require derating above 140 °C case temperature?
Yes - JANS1N4987US/TR must be linearly derated from 5 W at TEC = 140 °C to zero power at TEC = 175 °C. This derating curve is mandatory to maintain junction temperature within safe limits and ensure compliance with MIL-PRF-19500/356 thermal endurance requirements.
What is the maximum continuous Zener current IZM for JANS1N4987US/TR?
The maximum continuous Zener current IZM for JANS1N4987US/TR is 29.4 mA, calculated from PD = 5 W and VZ = 160 V (IZM = PD/VZ). This value is confirmed in the Electrical Characteristics table on page 2 of SD44A.pdf and applies at TEC = 140 °C.
How is polarity identified on JANS1N4987US/TR?
JANS1N4987US/TR uses a cathode band marking on the glass body to indicate polarity - the banded end is the cathode and must be connected to the higher-potential node in shunt regulator configurations. The unmarked end is the anode and connects to ground or return.
JANS1N4987US/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):
- 160 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 350 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 121.6 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
JANS1N4987US/TR FAQ
1.How can I place an order for JANS1N4987US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4987US/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 JANS1N4987US/TR reliable?
The price and inventory of JANS1N4987US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4987US/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4987US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4987US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4987US/TR?
JANS1N4987US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4987US/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 JANS1N4987US/TR?
For technical support, including JANS1N4987US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4987US/TR requirements.
6.How does Aetrix verify that JANS1N4987US/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4987US/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 JANS1N4987US/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4987US/TR?
All JANS1N4987US/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4987US/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 JANS1N4987US/TR part is unused and in its original packaging.
Return procedure for JANS1N4987US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANS1N4987US/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…
