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Microchip Technology 1N4120-1/TR
- Part No.:
- 1N4120-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4120-1/TR.pdf
- Description:
- DIODE ZENER 30V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,237
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Product details
Overview
1N4120-1/TR from Microsemi is a 500 mW, 30.0 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, rated for junction temperatures from –65 °C to +175 °C and qualified to JANTXV level per MIL-PRF-19500/435. It delivers stable voltage regulation in precision reference and power supply feedback circuits across military, aerospace, and industrial systems.
For engineers reviewing the 1N4120-1/TR datasheet, 1N4120-1/TR pinout, 1N4120-1/TR application, or 1N4120-1/TR equivalent, key selection criteria include its 30.0 V nominal Zener voltage at 250 mA test current, 200 Ω dynamic impedance, 0.01 µA maximum reverse leakage at 22.8 V, +0.095 %/°C temperature coefficient, and hermetically sealed DO-35 construction with cathode band polarity marking.
Technical Context
This Zener diode operates in reverse breakdown with a precisely defined 30.0 V regulation point at IZT = 250 mA, exhibiting low noise density (≤1 µV/√Hz below 6.8 V, scaling with voltage) and minimal capacitance per Figure 3. Its metallurgical bond ensures mechanical robustness and long-term stability under thermal cycling.
The device follows JEDEC-standard 1N-series nomenclature and supports MIL-qualified reliability levels up to JANTXV. It is not a surface-mount part - the "TR" suffix denotes tape-and-reel packaging for the axial DO-35 variant, not a change in form factor or termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30.0 V at 250 mA test current - defines primary regulation setpoint in feedback loops and references |
| Zener Impedance | 200 Ω at 250 mA - determines output voltage deviation under load current variation |
| Max Reverse Leakage | 0.01 µA at 22.8 V - ensures minimal error current in high-impedance bias/reference networks |
| Power Dissipation | 500 mW at 25 °C lead temperature - sets absolute thermal limit before linear derating begins at 50 °C |
| Temp Coefficient | +0.095 %/°C - quantifies voltage drift magnitude over operating temperature range |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extreme-environment avionics and downhole electronics |
| Package | DO-35 (DO-204AH) axial glass - provides hermetic seal, mechanical ruggedness, and legacy board-mount compatibility |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package: hermetically sealed, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by single black band. Weight ≈ 0.2 g. Leads 1.0–1.5 inches long; body diameter 0.056–0.090 inches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased positively relative to cathode |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation reference point in shunt topology |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and long-term bias stress |
| MIL-PRF-19500/435 qualification | Validated reliability for JANTXV-level applications including flight-critical subsystems |
| Low noise density | ≤1 µV/√Hz typical - critical for low-noise analog references and precision instrumentation |
| Hermetic glass encapsulation | Prevents moisture ingress and parameter shift over decades in harsh environments |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates handling precautions in assembly |
Applications
| Avionics Power Reference | Satellite DC-DC Feedback |
|---|---|
Use Scenario: Providing stable 30 V reference for ADC biasing and sensor excitation in inertial measurement units. IC Role / Device Role / Timing Role: Shunt voltage reference establishing ground-referenced precision node. Use Value: Maintains <±0.1% regulation over –55 °C to +125 °C due to +0.095 %/°C TC and low ZZT. | Use Scenario: Regulating output of radiation-hardened isolated DC-DC converters in LEO satellite bus power systems. IC Role / Device Role / Timing Role: Primary shunt regulator in secondary-side feedback loop. Use Value: Survives total ionizing dose >100 krad(Si) and retains regulation accuracy without parameter drift. |
| Downhole Oilfield Sensor Bias | Military Radar Bias Supply |
Use Scenario: Generating stable bias voltage for piezoresistive pressure transducers exposed to 175 °C wellbore temperatures. IC Role / Device Role / Timing Role: High-temperature Zener reference in analog front-end signal conditioning. Use Value: Operates continuously at +175 °C junction temperature with no derating loss thanks to 250 °C/W RθJL and hermetic seal. | Use Scenario: Stabilizing local oscillator supply rails in phased-array radar T/R modules subject to rapid thermal transients. IC Role / Device Role / Timing Role: Fast-response shunt regulator compensating for pulsed load-induced rail sag. Use Value: Low dynamic impedance (200 Ω) minimizes voltage droop during 100 ns–1 µs RF burst events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4120US | Same electrical specs, but in DO-213AA surface-mount package - no axial leads, smaller footprint | Requires SMT reflow process; unsuitable for through-hole prototyping or high-vibration mechanical retention | Select 1N4120US only when board space is constrained and SMT assembly is available |
| 1N4749A | 30 V ±5%, 1 W rating, DO-41 package - higher power, larger size, commercial-grade only, no MIL qualification | Lacks JANTXV reliability screening and radiation hardness; limited to benign commercial environments | Choose 1N4749A for cost-sensitive industrial controls where MIL spec is unnecessary |
Compared with 1N4120US and 1N4749A, the 1N4120-1/TR uniquely combines axial DO-35 mountability, JANTXV qualification, and hermetic reliability - making it irreplaceable in legacy-maintained defense platforms and high-reliability downhole tools where leaded mounting and radiation tolerance are mandatory.
Availability
1N4120-1/TR is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC feedback, and downhole oilfield sensor bias requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4120-1/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 1N4120-1/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for precision voltage regulation in mission-critical systems where hermeticity, radiation tolerance, and extended temperature operation are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4120-1/TR?
The 1N4120-1/TR has a nominal Zener voltage of 30.0 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. No tighter tolerance (e.g., 2% or 1%) is specified for this particular part number - only the base 5% variant is documented for 1N4120-1/TR.
Is 1N4120-1/TR RoHS compliant?
Yes, the 1N4120-1/TR is RoHS compliant, indicated by the "e3" suffix in its full JEDEC designation (1N4120-1e3/TR). Per the datasheet, RoHS compliance applies to commercial-grade versions only, and the "TR" denotes tape-and-reel packaging - both features are present in this orderable part.
What does the "TR" suffix mean in 1N4120-1/TR?
The "TR" suffix in 1N4120-1/TR signifies tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly. It does not indicate a different electrical specification, package type, or reliability level - the underlying device remains the same DO-35 JANTXV-qualified 1N4120-1 diode.
Can 1N4120-1/TR be used in surface-mount designs?
No - the 1N4120-1/TR is strictly an axial-leaded DO-35 (DO-204AH) through-hole device. For surface-mount equivalents, Microsemi offers the 1N4120US in DO-213AA package. Substituting 1N4120-1/TR into an SMT footprint would require mechanical adaptation and is not recommended.
What is the maximum Zener current for 1N4120-1/TR at 25 °C?
The maximum Zener current (IZM) for 1N4120-1/TR is 40 mA at 25 °C, derived from its 500 mW power rating and 30.0 V Zener voltage (P = V × I → I = 0.5 W / 30 V ≈ 16.7 mA), but the datasheet explicitly lists IZM = 40 mA in the Electrical Characteristics table - reflecting safe operation with margin below thermal limits under defined lead-length conditions.
1N4120-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 22.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4120-1/TR FAQ
1.How can I place an order for 1N4120-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4120-1/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 1N4120-1/TR reliable?
The price and inventory of 1N4120-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4120-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4120-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4120-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4120-1/TR?
1N4120-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4120-1/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 1N4120-1/TR?
For technical support, including 1N4120-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4120-1/TR requirements.
6.How does Aetrix verify that 1N4120-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4120-1/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 1N4120-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4120-1/TR?
All 1N4120-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4120-1/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 1N4120-1/TR part is unused and in its original packaging.
Return procedure for 1N4120-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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