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Microchip Technology 1N4984US/TR
- Part No.:
- 1N4984US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4984US/TR.pdf
- Description:
- DIODE ZENER 120V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:98
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Product details
Overview
1N4984US/TR from Microsemi is a surface-mount, voidless-hermetically-sealed glass Zener diode rated for 5 W power dissipation at TEC = 125 °C, with nominal Zener voltage of 120 V ±5%, dynamic impedance of 170 Ω at 10 mA, and maximum reverse leakage current of 2 μA at 91.2 V - used in high-reliability voltage regulation for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the 1N4984US/TR datasheet, 1N4984US/TR pinout, 1N4984US/TR application, or 1N4984US/TR equivalent, key selection criteria include its military-grade hermetic glass package (MIL-PRF-19500/356), -65 °C to +175 °C operating temperature range, and 1.0 %/°C temperature coefficient - critical for stable reference design in harsh-environment analog circuits.
Technical Context
This device operates as a precision shunt voltage regulator in breakdown mode, maintaining stable output voltage across wide current (10–1000 mA) and temperature (-65 °C to +175 °C) ranges. Its voidless-glass construction with internal Category I metallurgical bond ensures long-term reliability under thermal cycling and mechanical stress.
It exhibits low dynamic impedance (170 Ω at IZT = 10 mA) and tight voltage regulation (ΔVZ ≤ 10 V between 10% and 50% of IZM), enabling use in feedback loops requiring minimal voltage drift. The cathode-band polarity marking and Sn/Pb-finished copper end caps support automated SMT assembly per EIA-481-B tape-and-reel packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 120 V ±5% at IZT = 10 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 125 °C - sets maximum continuous thermal load without derating |
| Dynamic Impedance ZZ | 170 Ω at IZT = 10 mA - determines output voltage stability against current variation |
| Reverse Leakage IR | 2 μA max at VR = 91.2 V - ensures minimal parasitic current in standby regulation |
| Temp Coefficient αVZ | +0.100 %/°C - quantifies voltage drift over temperature; enables compensation in precision references |
| Max Surge Current IZSM | 1.0 A (8.3 ms square wave) - supports transient overvoltage clamping in protection circuits |
| Forward Voltage VF | 1.50 V at 1.0 A - defines conduction loss when used in forward-biased clamp configurations |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; "E" package (also designated D-5B); cathode indicated by band; weight 539 mg; Sn/Pb-finished copper end caps.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference | Provides low-impedance path for forward conduction; must be routed to lowest potential node |
| Cathode | Current exit terminal in reverse breakdown; connected to regulated voltage rail | Carries full Zener current during regulation; requires thermal relief on PCB for 5 W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal voids - ensures >20-year operational life in vacuum or high-humidity environments |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration up to 100 g - qualified for MIL-PRF-19500/356 Class JANS |
| Triple-layer passivation | Prevents surface contamination and leakage path formation - maintains IR ≥ 2 μA spec after 1000 hrs humidity testing |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Radiation hardness | Specified per MicroNote 050 - retains regulation performance after 100 krad(Si) total ionizing dose exposure |
Applications
| Aerospace Power Conditioning | Radiation-Hardened Instrumentation |
|---|---|
Use Scenario: Regulating reference voltage in satellite DC-DC converter feedback networks exposed to thermal cycling and cosmic radiation. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 120 V bias for error amplifiers and isolation drivers. Use Value: Maintains <±0.5% output stability over -65 °C to +125 °C due to low αVZ and hermetic seal - prevents mission-critical voltage drift. |
Use Scenario: Precision voltage clamping in nuclear reactor control system analog front-ends operating in high-dose gamma fields. IC Role / Device Role / Timing Role: Radiation-tolerant Zener clamp protecting ADC input stages from transients and overvoltage events. Use Value: Retains 120 V regulation accuracy after 100 krad(Si) exposure - avoids recalibration cycles in inaccessible installations. |
| Military Avionics Reference | High-Temperature Industrial Sensors |
Use Scenario: Generating stable bias for pressure transducer signal conditioners in fighter jet engine bays where ambient exceeds 150 °C. IC Role / Device Role / Timing Role: Primary voltage reference in analog sensor interface ICs requiring guaranteed operation up to +175 °C junction temperature. Use Value: Operates continuously at 125 °C case temperature with no parameter shift - eliminates thermal derating overhead in compact enclosures. |
Use Scenario: Overvoltage protection for thermocouple amplifier inputs in oil-well downhole tools subjected to 175 °C ambient and mechanical shock. IC Role / Device Role / Timing Role: Transient suppressor clamping supply rails during motor switching noise bursts in drilling electronics. Use Value: Withstands 1.0 A surge (8.3 ms) without degradation - prevents latch-up in downstream op-amps during field-induced spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4984US | Same electrical specs and package, but supplied in bulk (not tape/reel); no /TR suffix | No difference in circuit function or layout; only differs in packaging format for manual vs. automated assembly | Select 1N4984US/TR for pick-and-place production; choose 1N4984US for prototyping or low-volume hand-soldering |
| 1N4984 | Axial-leaded through-hole variant (no "US" suffix); identical Zener voltage and power rating but different thermal resistance (7 °C/W vs. 10 °C/W) | Requires PCB hole drilling and wave soldering; unsuitable for high-density SMT layouts | Use 1N4984 only when legacy through-hole compatibility or higher thermal conductivity at board level is required |
Compared with 1N4984US/TR, the bulk-packaged 1N4984US offers identical performance but lacks EIA-481-B tape-and-reel compliance, while the axial 1N4984 provides lower thermal resistance but mandates through-hole footprint - making 1N4984US/TR optimal for automated, high-reliability SMT deployment.
Availability
1N4984US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, radiation-hardened instrumentation, and military avionics requiring stable component supply with full traceability and extended lifecycle support.
Supply support for 1N4984US/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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and defense-grade analog and mixed-signal components.
The 1N4984US/TR belongs to Microsemi's MIL-PRF-19500/356-qualified Zener series designed specifically for voltage regulation in mission-critical systems where failure is not an option - including space, nuclear, and tactical platforms.
FAQ
What is the Zener voltage tolerance for 1N4984US/TR?
The 1N4984US/TR has a nominal Zener voltage of 120 V with a standard tolerance of ±5%, as specified in the Microsemi SD44A datasheet. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number. This tolerance applies at IZT = 10 mA and 25 °C ambient.
Does 1N4984US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N4984US/TR is qualified to MIL-PRF-19500/356 as a JAN/JANTX-class Zener diode. It meets all screening, testing, and construction requirements including voidless hermetic glass sealing, Category I metallurgical bonds, and triple-layer passivation - confirmed in the official Microsemi Scottsdale Division REV E datasheet.
What is the maximum continuous operating temperature for 1N4984US/TR?
The 1N4984US/TR supports continuous operation from -65 °C to +175 °C junction temperature. Its 5 W power rating is specified at TEC = 125 °C, with linear derating to zero at +175 °C. This wide range enables use in extreme environments such as jet engine bays and downhole drilling tools.
Is 1N4984US/TR radiation-hardened?
Yes, the 1N4984US/TR is inherently radiation-hardened per Microsemi MicroNote 050, retaining full electrical functionality after exposure to ≥100 krad(Si) total ionizing dose. This makes it suitable for satellite, nuclear, and high-altitude avionics applications where single-event effects must be mitigated.
What does the "/TR" suffix indicate in 1N4984US/TR?
The "/TR" suffix denotes tape-and-reel packaging per EIA-481-B standard, enabling automated SMT placement. The base part 1N4984US is identical electrically and mechanically but supplied in bulk. The /TR version includes orientation control, carrier tape specifications, and reel quantity compliance required for high-volume manufacturing.
1N4984US/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):
- 120 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 91.2 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:
- E-MELF
1N4984US/TR FAQ
1.How can I place an order for 1N4984US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4984US/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 1N4984US/TR reliable?
The price and inventory of 1N4984US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4984US/TR is usually 5 days.
3.What payment methods are accepted for 1N4984US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4984US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4984US/TR?
1N4984US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4984US/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 1N4984US/TR?
For technical support, including 1N4984US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4984US/TR requirements.
6.How does Aetrix verify that 1N4984US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4984US/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 1N4984US/TR meets industry standards.
7.What is the process for return or replacement of 1N4984US/TR?
All 1N4984US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4984US/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 1N4984US/TR part is unused and in its original packaging.
Return procedure for 1N4984US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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