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Microchip Technology 1N6489US/TR
- Part No.:
- 1N6489US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N6489US/TR.pdf
- Description:
- DIODE ZENER 4.7V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:175
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Product details
Overview
1N6489US/TR from Microsemi is a hermetically sealed, voidless glass MELF surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with a nominal Zener voltage of 4.7 V at 53 mA test current, ±5% tolerance (no suffix), and maximum dynamic impedance of 8 Ω at IZT. It operates across –65 °C to +175 °C junction temperature and is qualified to MIL-PRF-19500/406 at JAN/JANTX levels for high-reliability voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N6489US/TR datasheet, 1N6489US/TR pinout, 1N6489US/TR application, or 1N6489US/TR equivalent, this part delivers military-grade thermal stability, low-leakage reverse current (≤1.0 µA at 3.0 V), robust ESD immunity per MIL-STD-750 Method 1020, and radiation-hardened construction validated per MicroNote 050 - critical for avionics reference supplies and hardened analog front-ends.
Technical Context
This device belongs to Microsemi's 1N6485US–1N6491US series, specifically engineered as a low-voltage, high-stability Zener regulator using Category III internal metallurgical bonds and triple-layer passivation. Its 4.7 V nominal Zener voltage places it in the sub-5 V knee-regulation region where temperature coefficient is minimized and leakage control is critical.
Designed for end-cap thermal management, it exhibits RθJEC = 20 °C/W and uses a D-5A MELF package with tungsten slugs and Sn/Pb terminations. The 1N6489US/TR is not a general-purpose diode: its 8.3 ms non-repetitive surge rating (IZSM = 0.14 A), tight IR specification (≤1.0 µA @ 3.0 V), and 193 mg mass reflect optimization for thermal shock resistance and hermetic reliability in mission-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal at IZT = 53 mA - sets precise low-voltage reference point for biasing and regulation. |
| Power Dissipation (PD) | 1.5 W at TA = 25 °C - enables stable operation in compact, conduction-cooled layouts without forced airflow. |
| Dynamic Impedance (ZZT) | 8 Ω max at IZT - ensures minimal output voltage variation under load transients in feedback loops. |
| Reverse Leakage (IR) | ≤1.0 µA at VR = 3.0 V - guarantees negligible current draw in standby or precision sensing paths. |
| Junction Temp Range | –65 °C to +175 °C - supports operation in extreme environments including space-grade thermal cycling. |
| Tolerance | ±5% (no suffix) - provides predictable voltage margin for design validation without binning overhead. |
| Thermal Resistance | RθJEC = 20 °C/W - allows direct thermal path to PCB copper or heatsink via end-cap mounting. |
Pinout & Package
Package: D-5A MELF (Voidless hermetic glass, tungsten slugs, cathode band marking). Weight: 193 mg. Dimensions: BD = 0.091–0.103 in (2.31–2.62 mm), BL = 0.168–0.200 in (4.28–5.08 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown return path | Connected to circuit ground or lower-potential node; carries full Zener current during regulation. |
| Cathode | Zener breakdown voltage reference terminal | Marked by color band; supplies regulated 4.7 V output when reverse-biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and long-term parameter drift - essential for >20-year field life in sealed modules. |
| Category III metallurgical bond | Ensures mechanical integrity under thermal shock and vibration - validated for MIL-PRF-19500/406 JANS-level screening. |
| Triple-layer passivation | Prevents surface leakage and contamination-induced breakdown - critical for low-IR performance at high humidity. |
| MIL-STD-750 ESD immunity | No degradation after 1000 V HBM testing - enables safe handling in uncontrolled assembly environments. |
| Radiation hardness | Documented TID tolerance per MicroNote 050 - supports use in low-earth orbit and nuclear instrumentation. |
Applications
| Aerospace Power Reference | Avionics Sensor Biasing |
|---|---|
Use Scenario: Providing stable 4.7 V reference for ADCs and DACs in flight control computers operating across –55 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Precision voltage reference source for analog signal conditioning chains. Use Value: Low 8 Ω ZZT and <1 µA IR ensure <0.1% reference error over full temperature range and lifetime. |
Use Scenario: Biasing piezoresistive pressure transducers in engine monitoring systems exposed to thermal cycling and EMI. IC Role / Device Role / Timing Role: Low-noise, low-drift DC bias generator for bridge excitation. Use Value: Hermetic seal and Category III bond prevent parameter shift during 10,000+ thermal cycles - maintaining calibration integrity. |
| Hardened Industrial PLC I/O | Nuclear Instrumentation Supply |
Use Scenario: Regulating auxiliary supply rails in programmable logic controllers deployed in oil & gas refineries with ambient swings from –40 °C to +85 °C. IC Role / Device Role / Timing Role: Primary shunt regulator for isolated 5 V logic rails. Use Value: 1.5 W rating and 20 °C/W RθJEC allow direct PCB copper heat sinking - eliminating need for external heatsinks. |
Use Scenario: Generating stable bias for gamma-ray detector preamplifiers in radiation monitoring equipment requiring TID tolerance. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference in front-end analog signal chain. Use Value: Validated radiation hardness per MicroNote 050 ensures no parametric shift up to 100 krad(Si) - meeting IEC 62582 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6489US (non-TR) | Same electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel). | No functional difference; TR version supports automated SMT placement; bulk used for prototyping or manual assembly. | Select 1N6489US/TR for production line compatibility with pick-and-place feeders. |
| 1N6488US/TR | 4.3 V nominal Zener voltage (vs. 4.7 V); otherwise identical qualification, package, and thermal specs. | Suitable where system requires slightly lower reference voltage - e.g., 3.3 V LDO feedback networks with tighter headroom. | Choose 1N6488US/TR only if 4.3 V meets design margin; verify IZM = 0.17 A and ZZT = 9 Ω align with load requirements. |
Compared with 1N6489US/TR, the non-TR variant offers identical performance but lacks tape-and-reel logistics for high-volume SMT; 1N6488US/TR provides a 0.4 V lower reference with matching reliability and thermal behavior - enabling voltage-scaling flexibility without compromising MIL-spec compliance.
Availability
1N6489US/TR is available at Aetrix Electronics and suitable for aerospace power reference, avionics sensor biasing, and hardened industrial PLC I/O requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for 1N6489US/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, radiation-hardened, and military-qualified components for aerospace, defense, and industrial markets.
The 1N6485US–1N6491US series was developed to replace legacy axial DO-41 Zeners in space-constrained, high-temperature, and high-reliability applications - delivering MIL-PRF-19500/406 compliance in a surface-mount MELF form factor without sacrificing thermal or parametric stability.
FAQ
What is the Zener voltage tolerance for 1N6489US/TR?
The 1N6489US/TR has a nominal Zener voltage of 4.7 V with a standard tolerance of ±5%, indicated by the absence of a tolerance suffix in the part number. Tighter tolerances (±2% or ±1%) are available under different suffixes (C or D), but the TR-suffixed commercial version defaults to ±5% unless otherwise specified on the reel label or certificate of conformance.
Is 1N6489US/TR RoHS compliant?
The 1N6489US/TR is offered in RoHS-compliant versions (matte tin termination) for commercial-grade use only. Military-grade variants (JAN/JANTX) retain Sn/Pb terminations per MIL-PRF-19500/406 requirements. RoHS compliance is denoted by the "e3" suffix in the full nomenclature (e.g., 1N6489US/TR e3), and must be explicitly ordered as such.
What is the maximum continuous Zener current (IZM) for 1N6489US/TR?
The maximum continuous Zener current for 1N6489US/TR is 0.14 A (140 mA), calculated from PD = 1.5 W and VZ = 4.7 V (IZM = PD/VZ). This value assumes operation at TA = 25 °C with adequate thermal management; derating applies above 25 °C per the Figure 2 power-derating curve in the datasheet.
Does 1N6489US/TR have a specified temperature coefficient?
Yes - the 1N6489US/TR (4.7 V) falls within the low-temperature-coefficient region of the Zener family. Per Figure 1 in the datasheet, its typical temperature coefficient is approximately +0.05 %/°C near 25 °C, reflecting stable regulation over wide temperature ranges without external compensation.
Can 1N6489US/TR be used in place of 1N4489US?
No - 1N4489US is a 91 V Zener in the 1N4460US–1N4496US series with different thermal impedance (Figure 3), Category I bond structure, and higher voltage stress characteristics. The 1N6489US/TR belongs to the low-voltage 1N6485US–1N6491US series (3.3–5.6 V) with Category III bonding and distinct thermal curves (Figure 4); substitution would violate voltage, power, and qualification boundaries.
1N6489US/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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 4 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
1N6489US/TR FAQ
1.How can I place an order for 1N6489US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6489US/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 1N6489US/TR reliable?
The price and inventory of 1N6489US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6489US/TR is usually 5 days.
3.What payment methods are accepted for 1N6489US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6489US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6489US/TR?
1N6489US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6489US/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 1N6489US/TR?
For technical support, including 1N6489US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6489US/TR requirements.
6.How does Aetrix verify that 1N6489US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6489US/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 1N6489US/TR meets industry standards.
7.What is the process for return or replacement of 1N6489US/TR?
All 1N6489US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6489US/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 1N6489US/TR part is unused and in its original packaging.
Return procedure for 1N6489US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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