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Microchip Technology 1N4488US/TR
- Part No.:
- 1N4488US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4488US/TR.pdf
- Description:
- DIODE ZENER 91V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N4488US/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 91.0 V at 2.8 mA test current, ±5% tolerance (no suffix), and maximum dynamic impedance of 200 Ω at IZT. It is qualified to MIL-PRF-19500/406 at JAN/JANTX levels and used in high-reliability voltage regulation for aerospace power conditioning circuits.
For engineers reviewing the 1N4488US/TR datasheet, 1N4488US/TR pinout, 1N4488US/TR application, or 1N4488US/TR equivalent, key selection criteria include its 91 V Zener voltage, 200 Ω dynamic impedance at 2.8 mA, -65°C to +175°C junction temperature range, hermetic MELF package, and MIL-qualified reliability for mission-critical analog reference and overvoltage clamp functions.
Technical Context
This device operates as a precision voltage reference and shunt regulator in reverse-biased breakdown mode, delivering stable 91 V regulation across a broad current range (IZK = 0.05 mA to IZM = 16 mA) with low leakage (<0.25 µA at 72.8 V). Its thermal resistance junction-to-end cap is 20 °C/W, enabling reliable operation under sustained 1.5 W dissipation at 25 °C ambient.
The 1N4488US/TR uses triple-layer passivation and Category I internal metallurgical bonds for enhanced robustness and radiation hardness per MicroNote 050. It is non-sensitive to ESD per MIL-STD-750 Method 1020 and supports RoHS-compliant tin plating only in commercial-grade versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91.0 V at IZT = 2.8 mA - defines precise regulation point for feedback or clamping |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 200 Ω @ IZT = 2.8 mA - determines output voltage stability under load transients |
| Junction Temperature Range | -65 °C to +175 °C - enables operation in extreme environmental conditions including space and avionics |
| Reverse Leakage (IR) | ≤0.25 µA @ VR = 72.8 V - ensures minimal error current in high-impedance reference paths |
| Forward Voltage (VF) | 1.0 V @ 200 mA - defines conduction threshold in forward bias for protection or polarity sensing |
| Thermal Resistance (RθJEC) | 20 °C/W - quantifies thermal path efficiency from junction to end cap for heatsink design |
Pinout & Package
Package: A (D-5A) MELF - hermetically sealed voidless glass case with tungsten slugs, cathode indicated by single polarity band, 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 / low-side connection in shunt configuration | Connected to ground or lower potential node when regulating voltage at cathode |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 91 V reference relative to anode; marked with band for orientation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination risk and moisture ingress, ensuring long-term parameter stability in harsh environments |
| Triple-layer passivation | Enhances surface insulation integrity and prevents leakage path formation on glass surface |
| Category I metallurgical bond | Guarantees mechanical and thermal interface reliability between silicon die and tungsten slug under thermal cycling |
| MIL-PRF-19500/406 qualification | Validates performance to military screening standards including burn-in, temperature cycling, and life testing |
| Non-ESD-sensitive design | Withstands handling per MIL-STD-750 Method 1020 without parameter shift or failure |
Applications
| Aerospace Power Bus Regulation | Avionics Reference Voltage Generation |
|---|---|
Use Scenario: Stabilizing 100 V-class auxiliary bus in satellite power distribution units where voltage drift must remain <±0.5% over -55°C to +125°C. IC Role / Device Role / Timing Role: Shunt Zener regulator providing fixed 91 V reference for DC-DC converter feedback networks. Use Value: Maintains regulation accuracy despite wide temperature swings and radiation exposure due to hermetic sealing and Category I bonding. | Use Scenario: Generating precision bias voltage for analog front-end amplifiers in flight control sensor interfaces. IC Role / Device Role / Timing Role: Low-leakage (≤0.25 µA) voltage reference source for high-impedance op-amp input stages. Use Value: Minimizes offset error contribution from reference current, supporting <10 ppm/°C system-level stability. |
| Defense Radar Bias Supply Clamping | High-Reliability Industrial PLC Input Protection |
Use Scenario: Protecting RF amplifier bias rails from transient overvoltage during pulse transmission in ground-based radar systems. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing 8.3 ms surge currents up to 0.16 A without degradation. Use Value: Survives repetitive surges per MIL-STD-704 due to robust glass construction and 3000 Ω knee impedance at IZK. | Use Scenario: Safeguarding programmable logic controller analog input modules against field-wiring faults in oil & gas control cabinets. IC Role / Device Role / Timing Role: Overvoltage protector limiting input voltage to 91 V while maintaining <0.25 µA leakage at 72.8 V. Use Value: Prevents damage to downstream ADCs without loading signal sources, enabled by ultra-low reverse current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4488US (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 | Select 1N4488US/TR for high-volume production requiring reel-fed pick-and-place |
| 1N4488 | Identical Zener voltage and ratings but in DO-41 axial package; lacks MIL qualification and hermetic seal | Suitable for commercial-grade, non-mission-critical applications with less stringent reliability requirements | Choose 1N4488 only if cost sensitivity outweighs need for radiation hardness and extended temperature operation |
Compared with 1N4488US/TR, the bulk-packaged 1N4488US offers identical performance but no SMT automation support, while the DO-41 1N4488 sacrifices hermeticity and MIL qualification for lower cost and through-hole compatibility.
Availability
1N4488US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference generation, and defense radar bias clamping requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for 1N4488US/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 analog and mixed-signal components.
The 1N4488US/TR belongs to Microsemi's legacy MIL-PRF-19500/406-qualified Zener diode family, engineered for voltage regulation in mission-critical systems where failure is not an option - including space, defense, and nuclear instrumentation.
FAQ
What is the Zener voltage tolerance for 1N4488US/TR?
The 1N4488US/TR has a nominal Zener voltage of 91.0 V with a standard tolerance of ±5%, as 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 variant shipped is the standard 5% version unless otherwise specified.
Is 1N4488US/TR RoHS compliant?
The 1N4488US/TR is available in RoHS-compliant versions only for commercial-grade units, using matte tin plating over copper. MIL-qualified versions (JAN/JANTX) retain Sn/Pb terminations per specification. Always verify compliance status via the specific ordering code's datasheet revision and certificate of conformance.
What is the maximum surge current rating for 1N4488US/TR?
The 1N4488US/TR supports a non-repetitive peak Zener surge current (IZSM) of 0.16 A for an 8.3 ms square wave, as specified in the Electrical Characteristics table on page 3 of T4-LDS-0183-1 Rev. 1. This rating assumes proper thermal management and is validated per MIL-STD-704 surge test conditions.
Does 1N4488US/TR require a heatsink in normal operation?
No heatsink is required for 1N4488US/TR at 25 °C ambient when operating within its 1.5 W steady-state power limit, thanks to its low RθJEC of 20 °C/W. However, derating is necessary above 25 °C - e.g., maximum power drops to ~0.75 W at 75 °C ambient - and PCB copper area should be optimized per the recommended pad layout on page 6.
How is polarity identified on the 1N4488US/TR package?
Polarity on the 1N4488US/TR is indicated by a single cathode band on the glass body - the banded end is the cathode, and the opposite end is the anode. This marking aligns with JEDEC-standard MELF diode orientation and is visible under standard optical inspection during SMT assembly.
1N4488US/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):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 250 nA @ 72.8 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
1N4488US/TR FAQ
1.How can I place an order for 1N4488US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4488US/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 1N4488US/TR reliable?
The price and inventory of 1N4488US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4488US/TR is usually 5 days.
3.What payment methods are accepted for 1N4488US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4488US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4488US/TR?
1N4488US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4488US/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 1N4488US/TR?
For technical support, including 1N4488US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4488US/TR requirements.
6.How does Aetrix verify that 1N4488US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4488US/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 1N4488US/TR meets industry standards.
7.What is the process for return or replacement of 1N4488US/TR?
All 1N4488US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4488US/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 1N4488US/TR part is unused and in its original packaging.
Return procedure for 1N4488US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4488US/TR Tags
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