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Microchip Technology 1N459/TR
- Part No.:
- 1N459/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N459/TR.pdf
- Description:
- DIODE GP REV 200V 150MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,216
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Product details
Overview
1N459/TR from Microsemi is a hermetically sealed, metallurgically bonded fast-switching signal diode in DO-35 glass package, rated for 200 V peak reverse voltage (VRM), 175 V working peak reverse voltage (VRWM), and 120 mA forward current (IF), used in high-frequency RS-232/RS-422 interfaces and Ethernet 10 Base-T data lines.
For engineers reviewing the 1N459/TR datasheet, 1N459/TR pinout, 1N459/TR application, or 1N459/TR equivalent, key selection factors include its 1.0 V max forward voltage at 100 mA, 25 nA reverse leakage at VRWM, -65°C to +150°C junction temperature range, DO-35 mechanical compatibility, and JAN-level qualification per MIL-PRF-19500/193.
Technical Context
The 1N459/TR operates as a low-capacitance, fast-recovery switching diode with double-plug DO-35 construction and tin/lead or RoHS-compliant matte tin plating on copper-clad steel leads. Its metallurgical bonding ensures stable junction characteristics under thermal cycling.
It supports pulsed forward operation up to 120 mA with 1.0 V VF1 at 100 mA (8.5 ms pulse, 2% duty cycle) and maintains 1.2 V VF2 at -55°C, enabling reliable performance across military-grade temperature extremes and high-speed digital signal routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 200 V - maximum non-repetitive peak reverse voltage before breakdown; defines absolute reverse stress limit. |
| VRWM | 175 V - maximum continuous peak reverse voltage during normal operation; sets usable standoff level in signal clamping. |
| IF | 120 mA - maximum repetitive forward current; determines sustainable drive capability in logic-level switching paths. |
| VF1 @ 100 mA | 1.0 V max - forward voltage under pulsed test condition; directly impacts power loss and voltage margin in high-speed data line termination. |
| IR @ VRWM | 25 nA max at +25°C - ultra-low reverse leakage; preserves signal integrity in high-impedance receive circuits. |
| TJ Range | -65°C to +150°C - qualified operating junction temperature; enables deployment in aerospace, industrial control, and downhole electronics. |
Pinout & Package
DO-35 hermetically sealed glass package with axial leads; cathode identified by blue body and black band marking; total weight 0.2 g; lead material: copper-clad steel plated with tin/lead or RoHS-compliant matte tin (commercial grade only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of signal path; must be biased positive relative to cathode for conduction. |
| Cathode | Forward current exit / reverse blocking terminal | Banded end; connects to higher-potential node; provides reverse isolation up to 175 V in data line protection. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N459A series | Ensures standardized electrical behavior and interchangeability across certified suppliers and legacy designs. |
| Metallurgical bonding | Provides robust die attachment with minimal thermal resistance and long-term reliability under vibration and thermal shock. |
| Hermetic glass sealing | Prevents moisture ingress and contamination, supporting >20-year field life in harsh environments without conformal coating. |
| JAN qualification per MIL-PRF-19500/193 | Validates manufacturing process control, screening, and testing compliance for defense and space-critical applications. |
Applications
| RS-232 Interface Protection | Ethernet 10 Base-T Line Clamping |
|---|---|
Use Scenario: Bidirectional EIA-232 transceiver I/O lines exposed to ESD and cable-induced transients. IC Role / Device Role / Timing Role: Signal-level clamping diode placed between driver output and connector, shunting overvoltage to ground or VCC rail. Use Value: 175 V VRWM and 25 nA IR ensure minimal loading on 3–5 V logic signals while clamping ±15 V transients without leakage-induced offset drift. | Use Scenario: Differential pair protection in 10 Mbps Ethernet PHY interface with transformer-coupled outputs. IC Role / Device Role / Timing Role: Fast-switching transient suppressor across TX+/TX− or RX+/RX− lines to absorb line reflections and ESD events. Use Value: 1.0 V VF1 and sub-10 ns recovery enable clean signal edge preservation at 10 MHz symbol rates without distortion or timing skew. |
| Industrial Sensor Signal Conditioning | Aerospace Data Bus Termination |
Use Scenario: Low-power analog sensor outputs routed through long cables in factory automation systems. IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage protection diode at ADC input stage or op-amp buffer output. Use Value: -65°C to +150°C TJ range and 120 mA IF support operation in unheated enclosures and near motor drives without derating. | Use Scenario: MIL-STD-1553B or ARINC 429 bus receiver front-end in avionics modules requiring radiation-tolerant passive components. IC Role / Device Role / Timing Role: High-reliability signal conditioning element in flight-critical communication subsystems. Use Value: JAN-level qualification, hermetic DO-35 packaging, and 200 V VRM meet DO-160 Section 22 lightning-induced transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N459A | Same electrical specs; A-suffix denotes tightened VF and IR screening per MIL-PRF-19500/193. | Required for new JAN-qualified designs; not interchangeable with TR unless procurement spec mandates A-grade screening. | Select 1N459A when full JAN qualification documentation and traceable lot-level test reports are mandatory. |
| 1N459 | No suffix indicates commercial-grade version; identical DO-35 package and baseline electrical ratings but no MIL-PRF screening. | Suitable for cost-sensitive industrial or telecom equipment where military reliability is not required. | Choose 1N459 for volume production where DO-35 footprint and 200 V VRM are primary constraints, not qualification level. |
Compared with 1N459/TR, the 1N459A offers verified screening for mission-critical use, while the base 1N459 reduces cost and lead time for commercial designs-both share identical pinout, thermal profile, and signal integrity performance in 10 Mbps+ data paths.
Availability
1N459/TR is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T line clamping, and aerospace data bus termination requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for 1N459/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 ICs, discrete devices, and RF solutions for defense, aerospace, and industrial markets.
The 1N459/TR belongs to Microsemi's legacy JEDEC-registered switching diode family, engineered for fast recovery, low leakage, and hermetic reliability in mission-critical signal routing and transient suppression applications.
FAQ
What is the maximum reverse voltage rating for the 1N459/TR?
The 1N459/TR has a maximum reverse voltage (VRM) rating of 200 V and a working peak reverse voltage (VRWM) of 175 V. These values define its safe operating limits under DC and repetitive AC conditions respectively, and are validated per MIL-PRF-19500/193 for the TR-suffixed JAN-qualified variant. The 1N459/TR must not be subjected to reverse bias exceeding 175 V in continuous operation.
Is the 1N459/TR RoHS compliant?
The 1N459/TR is not RoHS compliant, as it uses traditional tin/lead plating on its copper-clad steel leads. RoHS-compliant versions (e3 suffix) are available only in commercial-grade variants (e.g., 1N459Ae3), not in the TR-suffixed JAN-qualified configuration. For RoHS requirements, engineers should specify the e3-marked commercial part instead of 1N459/TR.
What does the "TR" suffix mean in 1N459/TR?
The "TR" suffix in 1N459/TR denotes a JAN-qualified, tape-and-reel packaged version meeting MIL-PRF-19500/193 requirements. It confirms full military-level screening-including temperature cycling, burn-in, and parametric testing-as well as packaging per EIA-296 standards. This distinguishes it from commercial-only variants like 1N459 or RoHS-compliant 1N459Ae3.
Can the 1N459/TR replace the 1N459A in a design?
Yes, the 1N459/TR is functionally and mechanically identical to the 1N459A, sharing the same DO-35 package, electrical specifications, and JAN qualification. The TR suffix adds tape-and-reel packaging for automated assembly, while the A suffix emphasizes tightened VF and IR screening. Both meet MIL-PRF-19500/193, making 1N459/TR a drop-in replacement for 1N459A in SMT-compatible through-hole layouts.
What is the forward voltage of the 1N459/TR at 100 mA?
The forward voltage (VF1) of the 1N459/TR is guaranteed ≤1.0 V at 100 mA under pulsed conditions (8.5 ms pulse width, 2% duty cycle). This value is measured at +25°C and reflects typical conduction loss in high-speed switching paths. At -55°C, VF2 rises to 1.2 V, confirming stable low-temperature performance critical for aerospace deployments of the 1N459/TR.
1N459/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):
- 200 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 @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N459/TR FAQ
1.How can I place an order for 1N459/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N459/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 1N459/TR reliable?
The price and inventory of 1N459/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N459/TR is usually 5 days.
3.What payment methods are accepted for 1N459/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N459/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N459/TR?
1N459/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N459/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 1N459/TR?
For technical support, including 1N459/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N459/TR requirements.
6.How does Aetrix verify that 1N459/TR is sourced from the original manufacturer or authorized distributors?
All 1N459/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 1N459/TR meets industry standards.
7.What is the process for return or replacement of 1N459/TR?
All 1N459/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N459/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 1N459/TR part is unused and in its original packaging.
Return procedure for 1N459/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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