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Microchip Technology 1N4489US/TR
- Part No.:
- 1N4489US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4489US/TR.pdf
- Description:
- DIODE ZENER 100V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:86
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Product details
Overview
1N4489US/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 100 V ±5%, dynamic impedance of 250 Ω at 2.5 mA test current, and maximum reverse leakage of 0.25 µA at 80 V. It serves as a precision voltage reference in high-reliability military and aerospace power regulation circuits.
For engineers reviewing the 1N4489US/TR datasheet, 1N4489US/TR pinout, 1N4489US/TR application, or 1N4489US/TR equivalent, this page delivers verified electrical parameters, MIL-PRF-19500/406 qualification status, thermal impedance data, package dimensions, and direct alternatives for voltage reference design validation and obsolescence mitigation.
Technical Context
This device operates in reverse breakdown to maintain stable output voltage across wide current (2.5 mA to 14 mA) and temperature (–65 °C to +175 °C) ranges. Its internal Category III metallurgical bond and triple-layer passivation ensure robustness against thermal cycling and humidity.
The 1N4489US/TR uses a hard-glass A-size MELF (D-5A) package with tungsten slugs and tin/lead terminations, delivering 20 °C/W junction-to-end-cap thermal resistance and low 0.25 µA reverse leakage at VR = 80 V - critical for low-power biasing and reference stability in analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 100 V ±5% - defines regulated output level under 2.5 mA test current; supports precision reference in 80–120 V systems. |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - enables stable operation without forced cooling in compact military-grade PCB layouts. |
| Dynamic Impedance (ZZT) | 250 Ω @ IZT = 2.5 mA - ensures minimal output voltage variation under load transients in feedback networks. |
| Reverse Leakage (IR) | 0.25 µA @ VR = 80 V - guarantees negligible error current in high-impedance reference paths. |
| Junction Temperature Range | –65 °C to +175 °C - qualified for extended operation in avionics, downhole, and space-qualified electronics. |
| Thermal Resistance (RθJEC) | 20 °C/W - allows accurate thermal modeling when mounted on copper end-caps or thermal pads. |
| Surge Current (IZSM) | 0.14 A @ 8.3 ms square wave - withstands transient overvoltage events without degradation. |
Pinout & Package
The 1N4489US/TR is a two-terminal Zener diode in the A-size MELF (D-5A) package. Cathode is marked by a single band; no polarity-specific pin numbering applies. Package 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 knee reference | Connected to lower-potential node; establishes forward voltage drop (≤1.5 V @ 1 A) during fault conditions. |
| Cathode | Regulated output terminal / Zener breakdown node | Marked by band; supplies stable 100 V reference when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments (MIL-PRF-19500/406 compliant). |
| Category III metallurgical bond | Ensures mechanical integrity and thermal cycle reliability for JANS-qualified applications. |
| Triple-layer passivation | Reduces surface leakage and enhances stability under high-humidity or radiation-exposed conditions. |
| MIL-PRF-19500/406 qualification | Validated for JAN, JANTX, JANTXV, and JANS reliability levels - required for defense and space programs. |
| RoHS-compliant option | Available in commercial grade only with matte tin termination - supports dual-use compliance without performance trade-off. |
Applications
| Avionics Power Conditioning | Satellite Voltage Reference |
|---|---|
Use Scenario: Regulating auxiliary bus voltage in flight control computers where failure tolerance is mandatory. IC Role / Device Role / Timing Role: Zener diode providing primary 100 V reference for DC-DC converter feedback loop. Use Value: Maintains ±0.5% output accuracy over –55 °C to +125 °C ambient with <0.25 µA leakage, ensuring closed-loop stability. | Use Scenario: Biasing photodiode amplifiers in star tracker sensors requiring ultra-low noise and radiation hardness. IC Role / Device Role / Timing Role: Precision shunt reference establishing stable bias point for op-amp input stages. Use Value: Inherent radiation hardness per MicroNote 050 and 175 °C max junction temperature enable uninterrupted operation in LEO orbits. |
| Downhole Instrumentation | Tactical Radio Transceiver |
Use Scenario: Voltage clamping in high-temperature logging tools deployed at >150 °C wellbore environments. IC Role / Device Role / Timing Role: Overvoltage protection element across sensor supply rails. Use Value: Stable 100 V Zener voltage with <100 ppm/°C TC and 20 °C/W RθJEC prevents thermal runaway during extended operation. | Use Scenario: Reference stabilization in RF power amplifier bias networks subject to ESD and thermal shock. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant gate voltage under pulsed RF loads. Use Value: Non-sensitive to ESD per MIL-STD-750 Method 1020 and withstands 0.14 A surge current - critical for field-deployable comms gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4489US (tube) | Identical electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel). | No functional difference; tube version lacks EIA-481-B reel compatibility for automated placement. | Select 1N4489US/TR for SMT production lines requiring pick-and-place compatibility. |
| 1N4489 | Same Zener voltage and power rating but non-hermetic DO-41 axial package; lacks MIL-PRF-19500/406 qualification. | Not suitable for high-reliability or radiation-hardened applications; limited to commercial-grade equipment. | Choose 1N4489 only for cost-sensitive, non-military prototypes where hermeticity and qualification are not required. |
Compared with 1N4489US/TR, the tube variant offers identical performance but no reel support, while the DO-41 1N4489 sacrifices military qualification and hermetic sealing for lower cost and through-hole assembly - making 1N4489US/TR the sole choice for mission-critical surface-mount Zener regulation.
Availability
1N4489US/TR is available at Aetrix Electronics and suitable for avionics power conditioning, satellite voltage reference, and downhole instrumentation requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1N4489US/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4489US/TR belongs to Microsemi's military-qualified Zener diode family engineered specifically for voltage regulation in extreme-environment electronics where hermetic sealing, radiation tolerance, and MIL-PRF-19500/406 compliance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4489US/TR?
The 1N4489US/TR has a nominal Zener voltage of 100 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0183-1 datasheet. No suffix indicates the 5% grade; tighter tolerances (e.g., ±2% or ±1%) require different part number suffixes (C or D) and are not applicable to the 1N4489US/TR variant.
Is 1N4489US/TR RoHS compliant?
The 1N4489US/TR is available in RoHS-compliant versions only for commercial-grade units, using matte tin termination. Military-grade variants (JAN/JANTX/JANTXV/JANS) retain Sn/Pb terminations and are exempt from RoHS. The TR suffix denotes tape-and-reel packaging but does not imply RoHS status - compliance must be confirmed via ordering code suffix "e3" per the nomenclature guide on page 2.
What is the maximum continuous Zener current for 1N4489US/TR?
The maximum continuous Zener current (IZM) for 1N4489US/TR is 14 mA at TA = 25 °C, derived from its 1.5 W power rating and 100 V nominal Zener voltage (PD/VZ = 1.5 W / 100 V = 15 mA, derated to 14 mA per the Electrical Characteristics table). This value assumes proper thermal management via end-cap mounting.
Does 1N4489US/TR have MIL-PRF-19500/406 qualification?
Yes, the 1N4489US/TR is qualified per MIL-PRF-19500/406 at JAN, JANTX, JANTXV, and JANS reliability levels, as stated in the product description on page 1 of the datasheet. This qualification covers hermeticity, temperature cycling, mechanical shock, and long-term parameter stability - essential for defense and space applications.
What package type is used for 1N4489US/TR?
The 1N4489US/TR uses the A-size MELF (D-5A) package - a voidless hermetically sealed glass cylindrical surface-mount case with tungsten slugs and tin/lead or RoHS-compliant matte tin terminations. Dimensions are fully specified on page 6: BD = 0.091–0.103 in, BL = 0.168–0.200 in, and weight = 193 mg.
1N4489US/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):
- 100 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 250 nA @ 80 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
1N4489US/TR FAQ
1.How can I place an order for 1N4489US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4489US/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 1N4489US/TR reliable?
The price and inventory of 1N4489US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4489US/TR is usually 5 days.
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Once your 1N4489US/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 1N4489US/TR?
For technical support, including 1N4489US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4489US/TR requirements.
6.How does Aetrix verify that 1N4489US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4489US/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 1N4489US/TR meets industry standards.
7.What is the process for return or replacement of 1N4489US/TR?
All 1N4489US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4489US/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 1N4489US/TR part is unused and in its original packaging.
Return procedure for 1N4489US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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