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Microchip Technology 1N458/TR
- Part No.:
- 1N458/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N458/TR.pdf
- Description:
- DIODE GP REV 150V 150MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
1N458/TR from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 500 mW power dissipation at 25°C, with ±5% nominal voltage tolerance, 0.0005%/°C temperature coefficient, and 25 Ω dynamic impedance at 4.0 mA test current. It delivers ultra-stable voltage reference performance in precision instrumentation and military-grade analog circuits.
For engineers reviewing the 1N458/TR datasheet, 1N458/TR pinout, 1N458/TR application, or 1N458/TR equivalent, this part supports high-reliability voltage referencing where minimal drift over -65°C to +175°C operating range, low ESD sensitivity per MIL-STD-750 Method 1020, and hermetic glass sealing are critical design requirements.
Technical Context
This device belongs to the 1N4565–1N4584A-1 series of zero-temperature-coefficient Zener diodes, engineered using internal metallurgical bonding to achieve ultra-low TC down to 0.0005%/°C. Its 6.4 V nominal Zener voltage is stabilized across wide temperature ranges via compensated junction design.
It operates at a specified Zener test current of 4.0 mA, yielding 25 Ω dynamic impedance (ZZT), and maintains ≤2.0 µA reverse leakage at 3 V. The DO-7 package supports axial-leaded mounting with tin-lead plated leads compliant with MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V ±5% - stable reference point for analog calibration and feedback loops |
| Temperature Coefficient (αVZ) | 0.0005%/°C - enables <±0.3 mV drift over 0 to +75°C operating range |
| Zener Test Current (IZT) | 4.0 mA - optimal bias point for minimum impedance and TC stability |
| Dynamic Impedance (ZZT) | 25 Ω @ IZT - ensures low AC noise coupling into reference node |
| Max Reverse Current (IR) | 2.0 µA @ 3 V - guarantees high DC blocking integrity below breakdown |
| Power Dissipation (PD) | 500 mW @ TL = 25°C - supports robust thermal margin in sealed enclosures |
| Operating Temperature | -65°C to +175°C - qualified for aerospace, downhole, and extended industrial environments |
Pinout & Package
DO-7 (DO-204AA) hermetically sealed glass axial-leaded package with cathode band marking; leads are tin-lead plated and solderable per MIL-STD-750 Method 2026. Polarity: banded end is anode (positive) when operated as reference diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (banded end) | Reference output terminal | Connected to positive rail in shunt reference configuration; defines 6.4 V potential relative to cathode |
| Cathode (unbanded end) | Reference return terminal | Connected to system ground or regulated node; completes current path through external resistor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | 0.0005%/°C - minimizes voltage drift in unregulated thermal environments |
| Hermetic glass encapsulation | DO-7 package - ensures long-term parameter stability and moisture resistance |
| MIL-PRF-19500/452 qualification option | JANTXV prefix + "-1" suffix available - meets stringent military screening and reliability standards |
| Nonsensitive to ESD | Compliant with MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Tape-and-reel packaging | "TR" suffix denotes EIA-296 standard - enables automated SMT-compatible assembly despite axial form factor |
Applications
| High-Precision ADC Reference | Aerospace Power Monitoring |
|---|---|
Use Scenario: Providing stable 6.4 V reference for 16-bit SAR ADCs in flight control sensor interfaces. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute scale for analog-to-digital conversion. Use Value: Enables ±0.003% full-scale accuracy over -55°C to +100°C due to 0.0005%/°C TC and 25 Ω ZZT. |
Use Scenario: Regulating reference voltage for radiation-tolerant DC-DC converter feedback networks on satellite power systems. IC Role / Device Role / Timing Role: Primary voltage reference in isolated error amplifier loop. Use Value: Maintains <±1.5 mV deviation across -65°C to +175°C, supporting MIL-PRF-19500/452-compliant designs. |
| Downhole Oilfield Instrumentation | Military Grade Oscillator Biasing |
Use Scenario: Stabilizing bias points in high-temperature pressure transducer signal conditioning circuits at 150°C+ ambient. IC Role / Device Role / Timing Role: Precision shunt reference for op-amp gain-setting and offset trimming. Use Value: Delivers 6.4 V ±0.3% stability up to +175°C without derating, validated per DO-7 thermal profile. |
Use Scenario: Supplying temperature-invariant bias to VCXO varactor control amplifiers in secure comms radios. IC Role / Device Role / Timing Role: Low-noise voltage reference for oscillator tuning voltage generation. Use Value: Reduces frequency drift by >80% vs. standard Zeners due to sub-0.001%/°C effective TC at 4 mA bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4574A/TR | Zener test current = 1.0 mA; dynamic impedance = 100 Ω; same 0.0005%/°C TC and DO-7 package | Better suited for low-power biasing where <1 mA supply current is constrained | Select 1N4574A/TR when system power budget limits reference current to ≤1 mA |
| 1N4579A/TR | Zener test current = 2.0 mA; dynamic impedance = 50 Ω; identical TC and voltage rating | Optimized for medium-current references requiring lower impedance than 1N458/TR but higher than 1N4574A/TR | Choose 1N4579A/TR for balanced trade-off between impedance (50 Ω), power (12.8 mW), and thermal stability |
Compared with 1N4574A/TR and 1N4579A/TR, the 1N458/TR achieves lowest dynamic impedance (25 Ω) at highest test current (4.0 mA), making it ideal for high-accuracy, low-noise reference nodes where board-level power dissipation permits 25.6 mW operation.
Availability
1N458/TR is available at Aetrix Electronics and suitable for high-reliability voltage reference applications in aerospace avionics, downhole instrumentation, and military communications systems requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for 1N458/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 analog and mixed-signal components for defense, aerospace, and industrial markets.
The 1N458/TR belongs to Microsemi's legacy Scottsdale Division DO-7 Zener reference diode family, designed specifically for ultra-stable voltage referencing in mission-critical systems where hermeticity, radiation tolerance, and extreme temperature operation are mandatory.
FAQ
What is the Zener test current specification for 1N458/TR?
The 1N458/TR is characterized at a Zener test current (IZT) of 4.0 mA, which is the recommended operating point to achieve its specified 25 Ω dynamic impedance and 0.0005%/°C temperature coefficient. Operating significantly above or below this current increases impedance and degrades TC performance, as confirmed in the Electrical Characteristics Table on page 2 of the Microsemi datasheet.
Does 1N458/TR meet military specifications?
The base 1N458/TR is not inherently qualified to MIL-PRF-19500/452, but Microsemi offers fully screened versions: adding the JANTXV prefix and "-1" suffix (e.g., JANTXV1N458/TR-1) yields a device qualified to MIL-PRF-19500/452 with enhanced screening, lot traceability, and extended temperature validation - all documented in the same datasheet revision.
What does the "TR" suffix indicate in 1N458/TR?
The "TR" suffix in 1N458/TR denotes tape-and-reel packaging per EIA-296 standard, enabling automated placement despite the DO-7 axial-leaded form factor. This packaging option is explicitly called out in the Mechanical and Packaging section of the Microsemi datasheet and does not alter electrical specifications or reliability ratings.
How is polarity marked on the 1N458/TR package?
The 1N458/TR uses a cathode band marking on the glass body: the banded end is the anode (positive terminal) when used as a shunt reference diode, and the unbanded end is the cathode (negative/return terminal). This polarity convention is defined in the "POLARITY" section of the datasheet and must be observed to avoid reverse-bias damage during circuit operation.
What is the maximum power dissipation rating for 1N458/TR?
The 1N458/TR has a maximum DC power dissipation of 500 mW at lead temperature (TL) of 25°C. However, the datasheet notes that optimum voltage-temperature stability occurs at power levels below 30 mW - i.e., when biased near its 4.0 mA IZT - making thermal design critical for precision applications where long-term drift must remain within specification.
1N458/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard, Reverse Polarity
- Voltage - DC Reverse (Vr) (Max):
- 150 V
- Current - Average Rectified (Io):
- 150mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 150 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N458/TR FAQ
1.How can I place an order for 1N458/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N458/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 1N458/TR reliable?
The price and inventory of 1N458/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N458/TR is usually 5 days.
3.What payment methods are accepted for 1N458/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N458/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N458/TR?
1N458/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N458/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 1N458/TR?
For technical support, including 1N458/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N458/TR requirements.
6.How does Aetrix verify that 1N458/TR is sourced from the original manufacturer or authorized distributors?
All 1N458/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 1N458/TR meets industry standards.
7.What is the process for return or replacement of 1N458/TR?
All 1N458/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N458/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 1N458/TR part is unused and in its original packaging.
Return procedure for 1N458/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N458/TR Tags
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