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Microchip Technology 1N4120/TR
- Part No.:
- 1N4120/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4120/TR.pdf
- Description:
- DIODE ZENER 30V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:9,813
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Product details
Overview
1N4120/TR from Microsemi is a 30.0 V, 500 mW metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to JANTXV level per MIL-PRF-19500/435, with 5% voltage tolerance, 200 Ω dynamic impedance at 250 mA test current, and 0.01 µA maximum reverse leakage at 22.8 V. It delivers stable voltage regulation in precision reference and power supply feedback circuits across military and aerospace systems.
For engineers reviewing the 1N4120/TR datasheet, 1N4120/TR pinout, 1N4120/TR application, or 1N4120/TR equivalent, this page provides verified Zener voltage, thermal derating behavior, noise density (≤1 µV/√Hz), RoHS-compliant commercial-grade availability, and mil-spec qualification details essential for high-reliability analog design and compliance-critical sourcing.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with Zener voltage specified at 30.0 V ±5% under 250 mA test current (IZT). Its metallurgical bond construction ensures low noise density (≤1 µV/√Hz below 6.8 V), minimal capacitance (~3 pF typical), and inherent radiation hardness per MicroNote 050.
Thermal performance is defined by RθJL = 250 °C/W (junction-to-lead, 10 mm lead length) and linear power derating from 500 mW at 25 °C to zero at 175 °C ambient. Polarity is marked by cathode band; operation requires banded end positive relative to anode for regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30.0 V ±5% at IZT = 250 mA - defines nominal regulation point with predictable deviation in production units. |
| Power Dissipation (PM(AV)) | 500 mW at TL = 25 °C - sets maximum steady-state thermal load before derating begins at 50 °C. |
| Dynamic Impedance (ZZT) | 200 Ω at IZT = 250 mA - determines output voltage variation under changing load current (ΔVZ = IZ × ZZT). |
| Reverse Leakage (IR) | 0.01 µA max at VR = 22.8 V - ensures negligible current draw in standby or high-impedance bias networks. |
| Noise Density (ND) | ≤1 µV/√Hz at IZT = 250 mA - enables use in low-noise references where broadband voltage fluctuations must be minimized. |
| Temp. Coefficient (αVZ) | +0.095 %/°C - quantifies drift direction and magnitude for temperature-compensated circuit design. |
| Junction Temp. Range | -65 to +175 °C - supports operation in extreme environments including space and avionics. |
Pinout & Package
Hermetically sealed axial-leaded DO-35 (DO-204AH) glass package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by black band; weight ≈0.2 g; body diameter 1.42–2.29 mm, length 3.56–5.08 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or lower-potential rail; serves as return path for Zener current during regulation. |
| Cathode (banded end) | Regulated output node | Provides stable 30.0 V output when reverse-biased; polarity marking prevents incorrect installation in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low noise density (≤1 µV/√Hz) and high reliability without epoxy-induced parameter shift over time. |
| MIL-PRF-19500/435 qualification | Validated to JANTXV level for mission-critical applications requiring traceable screening, burn-in, and lot-level testing. |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift in humid or corrosive environments; eliminates humidity-related failures. |
| Non-ESD-sensitive design | Withstands ESD events per MIL-STD-750 Method 1020 without parameter degradation-no special handling required. |
| Low capacitance (~3 pF) | Minimizes high-frequency loading on reference nodes and preserves stability in fast-switching feedback loops. |
Applications
| Aerospace Power Monitoring | Military Avionics Reference |
|---|---|
|
Use Scenario: Voltage monitoring in 28 V DC aircraft bus systems with wide ambient temperature swings (-55 to +125 °C). IC Role / Device Role / Timing Role: Zener diode providing fixed 30.0 V reference for comparator-based overvoltage detection circuitry. Use Value: Stable regulation across -65 to +175 °C junction range and immunity to radiation effects enable reliable fault detection without recalibration. |
Use Scenario: Precision biasing of op-amps and ADCs in radar receiver front-ends operating in high-vibration environments. IC Role / Device Role / Timing Role: Low-noise (≤1 µV/√Hz), low-capacitance (3 pF) voltage reference source for analog signal conditioning stages. Use Value: Metallurgical bond and hermetic seal prevent microphonic noise and long-term drift, preserving signal integrity over 20+ year service life. |
| Satellite Power Regulation | High-Reliability Test Equipment |
|
Use Scenario: Secondary voltage reference in solar array regulators exposed to total ionizing dose (TID) >100 krad(Si). IC Role / Device Role / Timing Role: Radiation-hardened Zener element maintaining 30.0 V regulation under proton and gamma irradiation. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy, reducing SWaP-C. |
Use Scenario: Calibration reference in portable multimeters and benchtop power supplies requiring traceable accuracy and long-term stability. IC Role / Device Role / Timing Role: Primary 30.0 V Zener standard used to calibrate internal DACs and feedback dividers. Use Value: JANTXV qualification ensures lot-to-lot consistency and metrology-grade repeatability across production batches. |
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 surface-mount DO-213AA package; no axial leads. | Used where board space is constrained and reflow assembly is preferred over through-hole mounting. | Select 1N4120US only if PCB layout supports SMT and thermal pad design accommodates RθJA = 300 °C/W. |
| 1N4120-1 | Identical DO-35 package and electrical parameters; differs only in RoHS status (1N4120-1 is non-RoHS, 1N4120/TR is RoHS-compliant commercial grade). | Required for legacy military programs specifying non-RoHS components or exempt from EU directives. | Choose 1N4120-1 only when RoHS exemption applies; otherwise 1N4120/TR satisfies modern environmental compliance. |
Compared with 1N4120US and 1N4120-1, the 1N4120/TR offers RoHS-compliant plating while retaining full JANTXV-qualified performance and DO-35 mechanical compatibility-enabling drop-in replacement in existing through-hole designs without layout change or requalification.
Availability
1N4120/TR is available at Aetrix Electronics and suitable for aerospace power monitoring, military avionics reference, and satellite power regulation requiring stable component supply, long-term obsolescence management, and traceable mil-spec sourcing.
Supply support for 1N4120/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 analog and mixed-signal components for defense, aerospace, and industrial markets.
The 1N4120/TR belongs to Microsemi's legacy 1N4099–1N4135 series of mil-qualified Zener diodes, designed specifically for voltage regulation in harsh-environment systems demanding radiation tolerance, thermal stability, and long-term parametric consistency.
FAQ
What is the Zener voltage tolerance for 1N4120/TR?
The 1N4120/TR has a nominal Zener voltage of 30.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance applies at 25 °C with IZT = 250 mA and thermal equilibrium conditions.
Is 1N4120/TR RoHS compliant?
Yes, the 1N4120/TR is RoHS compliant (per e3 suffix), using annealed matte-tin plating on commercial-grade units. This is explicitly stated in the PART NOMENCLATURE section and confirmed in the FEATURES list. JANTXV-qualified versions retain RoHS compliance unless otherwise specified.
What is the maximum reverse leakage current for 1N4120/TR?
The maximum reverse leakage current (IR) for 1N4120/TR is 0.01 µA at VR = 22.8 V, as specified in the Electrical Characteristics table on page 3. This value reflects worst-case leakage under rated reverse voltage and is critical for low-power bias network design.
Does 1N4120/TR require derating above 25 °C?
Yes, the 1N4120/TR must be linearly derated starting at 25 °C ambient (on a typical PCB) or 50 °C lead temperature, reaching zero power dissipation at 175 °C. Derating follows the curve in Figure 2 of T4-LDS-0245-2, with slope determined by RθJA = 300 °C/W or RθJL = 250 °C/W depending on mounting condition.
What package type does 1N4120/TR use?
The 1N4120/TR uses the DO-35 (DO-204AH) axial-leaded hermetically sealed glass package, with cathode identified by a black band. Dimensions are fully specified on page 5, including body diameter (1.42–2.29 mm) and length (3.56–5.08 mm), and it supports tape-and-reel packaging with the "TR" suffix.
1N4120/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7 (DO-204AA)
1N4120/TR FAQ
1.How can I place an order for 1N4120/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4120/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/TR reliable?
The price and inventory of 1N4120/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/TR is usually 5 days.
3.What payment methods are accepted for 1N4120/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4120/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4120/TR?
1N4120/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4120/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/TR?
For technical support, including 1N4120/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4120/TR requirements.
6.How does Aetrix verify that 1N4120/TR is sourced from the original manufacturer or authorized distributors?
All 1N4120/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/TR meets industry standards.
7.What is the process for return or replacement of 1N4120/TR?
All 1N4120/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4120/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/TR part is unused and in its original packaging.
Return procedure for 1N4120/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4120/TR Tags
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