My Inquiry
My Account
Microchip Technology 1N6487US/TR
- Part No.:
- 1N6487US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N6487US/TR.pdf
- Description:
- DIODE ZENER 3.9V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:91
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N6487US/TR from Microsemi is a hermetically sealed, voidless glass MELF surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with nominal Zener voltage of 3.9 V ±5%, 64 mA test current (IZT), and dynamic impedance of 9 Ω at IZT. It operates across –65 °C to +175 °C junction temperature and is qualified to MIL-PRF-19500/406 at JANTX level for high-reliability voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N6487US/TR datasheet, 1N6487US/TR pinout, 1N6487US/TR application, or 1N6487US/TR equivalent, this part delivers military-grade Zener stability, low-temperature-coefficient regulation below 5 V, and robust thermal performance in compact D-5A MELF packaging - critical for precision reference and overvoltage protection in avionics and defense electronics.
Technical Context
This device functions as a low-voltage, high-stability Zener regulator optimized for operation near the knee of the breakdown curve, with specified IZK = 1.0 mA and ZZK = 400 Ω. Its Category III internal metallurgical bond ensures mechanical integrity under shock/vibration stress.
The 1N6487US/TR uses a tungsten-slug end-cap construction with tin/lead terminations, enabling 20 °C/W junction-to-end-cap thermal resistance and compatibility with standard SMT reflow profiles up to 260 °C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% at 64 mA - sets precise low-voltage reference point for biasing or clamping |
| Power Dissipation (PD) | 1.5 W @ 25 °C - supports continuous regulation in compact layouts without forced cooling |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in extreme environmental conditions including space and engine bays |
| Dynamic Impedance (ZZT) | 9 Ω @ 64 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 1.0 µA @ 1.0 V - guarantees negligible quiescent current in standby mode |
| Forward Voltage (VF) | 1.0 V @ 200 mA - defines conduction threshold when used bidirectionally or in series configurations |
| Thermal Resistance (RθJEC) | 20 °C/W - allows accurate junction temperature estimation from end-cap measurement |
Pinout & Package
Package: D-5A MELF (Voidless hermetic glass with tungsten slugs, cathode indicated by band, weight 193 mg).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during forward bias; used for polarity-sensitive clamping |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable reverse-biased regulation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| Category III metallurgical bond | Ensures mechanical reliability under high-G shock and thermal cycling per MIL-PRF-19500/406 |
| Triple-layer passivation | Reduces surface leakage and enhances stability of low-voltage Zener characteristics |
| MIL-PRF-19500/406 qualification | Validates performance consistency across JAN/JANTX/JANTXV/JANS screening levels for mission-critical use |
| Non-ESD-sensitive design | Withstands ESD events per MIL-STD-750 Method 1020 without parameter shift or failure |
Applications
| Aerospace Power Conditioning | Defense System Reference |
|---|---|
Use Scenario: Regulating auxiliary rail voltage in satellite power management units where ambient temperature swings exceed 100 °C. IC Role / Device Role / Timing Role: Zener voltage reference for error amplifier feedback loop in DC-DC converter. Use Value: Maintains ±0.2 V regulation over –55 °C to +125 °C due to low-tempco and hermetic stability. | Use Scenario: Providing stable 3.9 V bias for analog front-end circuitry in radar receiver modules. IC Role / Device Role / Timing Role: Low-noise voltage clamp protecting ADC input stages from transient overvoltage. Use Value: 9 Ω dynamic impedance minimizes noise coupling into sensitive RF signal paths. |
| Avionics Sensor Interface | Tactical Radio Biasing |
Use Scenario: Supplying excitation voltage to piezoresistive pressure sensors in flight control systems. IC Role / Device Role / Timing Role: Precision shunt regulator establishing sensor bridge reference potential. Use Value: 1.0 µA leakage at 1.0 V prevents loading errors in high-impedance sensor bridges. | Use Scenario: Generating local bias for RF power amplifier driver stages in manpack radios. IC Role / Device Role / Timing Role: Stable low-voltage Zener source replacing active regulators to reduce component count. Use Value: Hermetic seal and MIL qualification ensure uninterrupted operation during field-deployed vibration and humidity exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6487US | Same electrical specs and package; differs only in tape-and-reel packaging (TR suffix denotes reel delivery) | No functional difference; identical use in automated SMT assembly | Select 1N6487US/TR when requiring factory-packaged reels for pick-and-place production |
| 1N5226B | 3.3 V nominal Zener, DO-35 axial package, 500 mW rating, commercial grade only | Lacks MIL qualification, lower power, larger footprint - unsuitable for high-reliability or high-power density designs | Choose only for cost-sensitive, non-military prototypes where 3.3 V and 0.5 W suffice |
Compared with 1N6487US/TR, the 1N6487US offers identical performance in bulk packaging, while the 1N5226B trades military reliability and 1.5 W capability for lower cost and legacy through-hole compatibility - making it inappropriate for aerospace or defense deployments requiring validated lifetime stability.
Availability
1N6487US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference, avionics sensor interface, and tactical radio biasing requiring stable component supply under extended temperature and shock/vibration stress.
Supply support for 1N6487US/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 Corporation (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 1N6487US/TR belongs to Microsemi's military-qualified Zener diode family designed specifically for voltage regulation in mission-critical systems where parameter stability, radiation tolerance, and hermetic reliability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N6487US/TR?
The 1N6487US/TR has a nominal Zener voltage of 3.9 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 3 of Microsemi T4-LDS-0183-1. This tolerance applies at the specified test current of 64 mA and case temperature of 25 °C. Tighter tolerances (±2% or ±1%) are available under different suffixes but are not applicable to the TR-suffixed commercial/military hybrid variant.
Is 1N6487US/TR RoHS compliant?
The 1N6487US/TR is not RoHS compliant. Per the nomenclature guide on page 2 of the datasheet, RoHS-compliant versions carry the "e3" suffix (e.g., 1N6487US e3), and are available only in commercial grade. The TR suffix indicates tape-and-reel packaging but does not imply RoHS compliance; this part retains standard tin/lead terminations required for MIL-PRF-19500/406 qualification.
What is the maximum continuous Zener current (IZM) for 1N6487US/TR?
The maximum continuous Zener current (IZM) for 1N6487US/TR is 35 mA, derived from the 1.5 W power rating and 3.9 V nominal Zener voltage (P = V × I → I = 1.5 W / 3.9 V ≈ 38.5 mA), rounded down per the Electrical Characteristics table on page 3, which lists "35" in the IZM column for 1N6487US. This value assumes operation at 25 °C case temperature with proper thermal management.
Does 1N6487US/TR have a specified temperature coefficient?
Yes, the 1N6487US/TR has a temperature coefficient characteristic shown in Figure 1 of the datasheet. As a 3.9 V Zener, it falls in the low-voltage region (<5 V) where the temperature coefficient is negative and typically ranges between –0.05 %/°C and –0.1 %/°C. This behavior is inherent to Zener mechanisms below ~5 V and is confirmed by the downward slope in the Temperature Coefficient vs. Zener Voltage curve.
What is the surge current rating for 1N6487US/TR?
The non-repetitive peak Zener surge current (IZSM) for 1N6487US/TR is 3.6 A for an 8.3 ms square wave pulse, as listed in the Electrical Characteristics table on page 3. This rating reflects the device's ability to absorb short-duration overvoltage transients without degradation, enabled by its hermetic glass construction and Category III metallurgical bond.
1N6487US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 35 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D-5A
1N6487US/TR FAQ
1.How can I place an order for 1N6487US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6487US/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 1N6487US/TR reliable?
The price and inventory of 1N6487US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6487US/TR is usually 5 days.
3.What payment methods are accepted for 1N6487US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6487US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6487US/TR?
1N6487US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6487US/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 1N6487US/TR?
For technical support, including 1N6487US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6487US/TR requirements.
6.How does Aetrix verify that 1N6487US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6487US/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 1N6487US/TR meets industry standards.
7.What is the process for return or replacement of 1N6487US/TR?
All 1N6487US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6487US/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 1N6487US/TR part is unused and in its original packaging.
Return procedure for 1N6487US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6487US/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…
