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Microchip Technology 1N459
- Part No.:
- 1N459
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N459.pdf
- Description:
- DIODE GEN PURP 200V 150MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,454
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Product details
Overview
1N459 from Microsemi is a JEDEC-registered hermetically sealed glass switching diode in DO-35 package, with 200 V maximum reverse voltage (VRM), 175 V working peak reverse voltage (VRWM), and 1.0 V max forward voltage at 100 mA - used in high-frequency RS-232/RS-422 interface networks and Ethernet 10 Base-T links.
For engineers reviewing the 1N459 datasheet, 1N459 pinout, 1N459 application, or 1N459 equivalent, key selection criteria include VRWM rating for transient-tolerant signal clamping, low junction capacitance for >10 MHz data line integrity, metallurgical bonding for thermal reliability in aerospace-grade layouts, and JAN qualification path per MIL-PRF-19500/193.
Technical Context
The 1N459 operates as a fast-switching signal diode with metallurgically bonded P-N junction and double-plug DO-35 glass package, enabling stable performance from –65 °C to +150 °C junction temperature. Its 120 mA forward current rating (IF) and 150 mA average rectified output current (IO) support pulsed logic-level clamping without thermal runaway.
Reverse leakage is tightly controlled: ≤25 nA at VRWM (175 V, +25 °C), ≤1 µA at VRM (200 V, +25 °C), and ≤5 µA at VRWM (175 V, +150 °C), ensuring minimal signal distortion in high-impedance receiver inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 200 V - maximum non-repetitive reverse voltage before breakdown; defines absolute clamp ceiling in surge events. |
| VRWM | 175 V - continuous peak reverse voltage limit across full temperature range; sets safe operating margin for RS-422 common-mode rejection. |
| VF @ 100 mA | 1.0 V max - ensures <100 mW conduction loss at typical logic-level drive currents. |
| IF | 120 mA - peak forward current capability; supports short-duration pulse clamping in data line transients. |
| IO | 150 mA - average rectified output current at +25 °C; derates linearly to 0 mA at +150 °C for thermal design. |
| Junction Temp | –65 °C to +150 °C - enables operation in military/aerospace environments without derating penalties below –55 °C. |
Pinout & Package
DO-35 hermetically sealed glass package with axial leads: cathode identified by blue body coating and black band; anode and cathode terminals are tin/lead or RoHS-compliant matte tin plated copper-clad steel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | P-type semiconductor terminal | Accepts positive bias to enable forward conduction; connects to signal source or power rail in clamping configurations. |
| Cathode | N-type semiconductor terminal | Identified by blue body + black band; ties to reference node (e.g., ground or VCC) in protection circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bonding | Eliminates wire-bond fatigue failure modes; sustains mechanical shock up to 100 g in avionics mounting. |
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift; required for MIL-PRF-19500/193 JAN qualification. |
| Double-plug DO-35 construction | Enables precise lead alignment and consistent solder joint formation in automated through-hole assembly. |
| Tight VF distribution (≤1.0 V) | Reduces variation in clamping threshold across production lots; critical for multi-diode parallel ESD arrays. |
Applications
| RS-232 Interface Protection | Ethernet 10 Base-T Line Clamping |
|---|---|
Use Scenario: Protecting UART TX/RX lines against ESD and cable-induced transients in industrial serial gateways. IC Role / Device Role / Timing Role: Signal-level clamping diode placed between driver output and connector pin. Use Value: 175 V VRWM prevents false triggering during ±15 V RS-232 swings while 1.0 V VF ensures minimal signal attenuation. | Use Scenario: Suppressing common-mode surges on twisted-pair Ethernet PHY interfaces. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor in front-end differential pair protection network. Use Value: Low 25 nA IR at VRWM preserves DC balance in 100 Ω termination networks without loading effects. |
| Avionics Data Bus Isolation | High-Density PCB Signal Routing |
Use Scenario: Isolating ARINC 429 or MIL-STD-1553B bus drivers from antenna-coupled RF interference. IC Role / Device Role / Timing Role: Fast-recovery switching diode in series with data line to block reverse current during fault conditions. Use Value: 120 mA IF rating supports 1 µs pulse compliance testing per DO-160 Section 22, Level A. | Use Scenario: High-density routing of clock and control signals on compact flight computer modules. IC Role / Device Role / Timing Role: Low-capacitance signal diode used for level-shifting and logic isolation in mixed-voltage domains. Use Value: DO-35 package footprint (0.056" diameter × 1.0"–1.5" length) enables tight lead spacing without crosstalk. |
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 test limits per MIL-PRF-19500/193 Annex A. | Required for JAN-qualified designs; includes additional screening (burn-in, thermal shock). | Select 1N459A when MIL-STD-883 Class B or higher reliability is mandated. |
| 1N4148W | Lower VRWM (100 V), higher IF (300 mA), plastic DO-35 package; no hermetic seal or JAN option. | Suitable for commercial-grade consumer electronics; not rated for aerospace or extended temperature operation. | Choose 1N4148W only for cost-sensitive, non-military applications where 175 V VRWM is not required. |
Compared with 1N459, the 1N459A adds military-grade screening without altering electrical behavior, while the 1N4148W trades hermeticity and voltage rating for lower cost and higher forward current - making 1N459 the sole choice for 175 V clamping in sealed, high-reliability signal paths.
Availability
1N459 is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T line clamping, and avionics data bus isolation requiring stable component supply across extended temperature and radiation-tolerant environments.
Supply support for 1N459 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 RF semiconductors for aerospace, defense, and industrial markets.
The 1N459 belongs to Microsemi's legacy JEDEC-registered switching diode family, engineered specifically for hermetic signal integrity in mission-critical data interfaces and MIL-qualified systems.
FAQ
What is the maximum reverse voltage rating for the 1N459?
The 1N459 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 range under steady-state and transient conditions respectively, and are validated per MIL-PRF-19500/193 test protocols. The 1N459 must not be subjected to reverse bias exceeding 175 V continuously in design.
Is the 1N459 hermetically sealed and qualified for military use?
Yes, the 1N459 is hermetically sealed in a glass DO-35 package and qualifies for JAN-level reliability per MIL-PRF-19500/193 when ordered as JAN 1N459. This includes rigorous environmental screening such as thermal cycling, mechanical shock, and burn-in. The standard 1N459 (non-JAN) retains the same hermetic construction but omits military screening.
What is the forward voltage drop of the 1N459 at 100 mA?
The 1N459 exhibits a maximum forward voltage (VF) of 1.0 V at 100 mA forward current under pulsed conditions (tp = 8.5 ms, 2% duty cycle). This value is guaranteed across the full operating temperature range and is critical for minimizing conduction loss in high-speed signal clamping circuits using the 1N459.
How does the 1N459 differ from the 1N458 and 1N457 in terms of voltage ratings?
The 1N459 differs from the 1N458 and 1N457 in its higher reverse voltage capability: 1N459 has VRM = 200 V and VRWM = 175 V, versus 1N458 (VRM = 150 V, VRWM = 125 V) and 1N457 (VRM = 70 V, VRWM = 60 V). All three share identical VF, IR, and package specifications, making the 1N459 the highest-voltage variant in the 1N457–1N459 series.
What packaging and marking features identify the 1N459?
The 1N459 uses a DO-35 hermetically sealed glass package with axial leads, blue body coating, and black band marking the cathode end. Terminals are tin/lead or RoHS-compliant matte tin plated copper-clad steel. Weight is 0.2 grams, and dimensions follow JEDEC TO-204AA standards with BD = 0.056–0.075 inches and BL = 0.140–0.180 inches.
1N459 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- 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 FAQ
1.How can I place an order for 1N459 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N459 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 reliable?
The price and inventory of 1N459 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N459 is usually 5 days.
3.What payment methods are accepted for 1N459?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N459 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N459?
1N459 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N459 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?
For technical support, including 1N459 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N459 requirements.
6.How does Aetrix verify that 1N459 is sourced from the original manufacturer or authorized distributors?
All 1N459 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 meets industry standards.
7.What is the process for return or replacement of 1N459?
All 1N459 units undergo pre-shipment inspection (PSI). If there is an issue with 1N459, 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 part is unused and in its original packaging.
Return procedure for 1N459:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N459 Tags
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