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Microchip Technology 1N459A/TR
- Part No.:
- 1N459A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N459A/TR.pdf
- Description:
- DIODE GP REV 200V 150MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
1N459A/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 1N459A/TR datasheet, 1N459A/TR pinout, 1N459A/TR application, or 1N459A/TR equivalent, key selection criteria include VRWM stability over temperature, low junction capacitance, tight VF control at 100 mA, and JAN-level reliability qualification per MIL-PRF-19500/193.
Technical Context
The 1N459A/TR operates as a unidirectional silicon switching diode with double-plug DO-35 construction, enabling fast recovery times suitable for >10 MHz signal routing. Its metallurgical bond and hermetic glass seal ensure stable leakage performance across -65°C to +150°C junction temperature range.
It delivers 1.0 V max forward voltage at 100 mA pulsed (8.5 ms, 2% duty cycle) and maintains ≤5 µA reverse current at VRWM = 175 V and TA = +150°C - critical for noise-sensitive serial interface receivers and core driver stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 200 V - maximum non-repetitive peak reverse voltage; defines absolute breakdown limit under transient conditions. |
| VRWM | 175 V - maximum continuous operating reverse voltage; sets usable DC/AC bias headroom in interface circuits. |
| IF | 120 mA - maximum repetitive forward current; determines drive capability in logic-level switching paths. |
| VF @ 100 mA | 1.0 V max - ensures minimal voltage drop and power loss in low-voltage signal clamping or steering networks. |
| IR @ VRWM | 25 nA @ +25°C - ultra-low leakage preserves signal integrity in high-impedance receiver inputs. |
| TJ Range | -65°C to +150°C - supports operation in military, aerospace, and industrial environments without derating. |
Pinout & Package
DO-35 glass axial package: hermetically sealed, blue body with black digit marking, cathode indicated by band; tin/lead or RoHS-compliant matte tin plating on copper-clad steel leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node in clamping, steering, or rectification paths. |
| Cathode | Forward current exit / reverse blocking terminal | Banded end; ties to higher-potential rail or signal return to enable directional conduction. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N459A | Industry-standard pin-compatible replacement for legacy designs requiring proven reliability and traceable specs. |
| Metallurgical bonding | Eliminates wire-bond fatigue failure modes, enhancing long-term stability in vibration-prone systems. |
| Hermetic DO-35 seal | Prevents moisture ingress and parameter drift over time, critical for mission-critical communications hardware. |
| JAN qualification | Meets MIL-PRF-19500/193 Level J requirements - verified screening, lot traceability, and extended temp testing. |
Applications
| RS-232 Interface Protection | Ethernet 10 Base-T Line Clamping |
|---|---|
Use Scenario: Protecting UART transceivers against ESD and line faults in industrial serial links. IC Role / Device Role: Bidirectional transient voltage clamp placed between driver output and connector. Use Value: 175 V VRWM enables safe operation across ±15 V RS-232 swing while maintaining <25 nA leakage at room temperature. | Use Scenario: Signal integrity preservation in twisted-pair PHY layer of legacy Ethernet nodes. IC Role / Device Role: High-speed signal steering diode in differential pair termination networks. Use Value: Low capacitance and 120 mA IF rating support clean edge transitions up to 10 Mbps without distortion. |
| Switching Core Driver | Military Data Acquisition Front-End |
Use Scenario: Isolating gate drive signals in isolated DC-DC converter control loops. IC Role / Device Role: Fast-recovery switch in optocoupler output stage or level-shifting path. Use Value: 1.0 V VF at 100 mA minimizes propagation delay skew and reduces thermal load in compact SMT layouts. | Use Scenario: Signal conditioning in airborne telemetry modules exposed to extreme thermal cycling. IC Role / Device Role: Input protection diode in analog front-end multiplexers handling sensor excitation signals. Use Value: -65°C to +150°C TJ range and JAN qualification ensure parametric stability across flight envelope without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N459A (non-TR) | Same electrical specs and DO-35 package; differs only in packaging format (bulk vs. tape-and-reel). | No functional difference; TR version supports automated pick-and-place assembly. | Select 1N459A/TR when volume production requires reel-fed placement. |
| 1N458A/TR | Lower VRWM (125 V) and higher IF (165 mA); otherwise identical construction and qualification. | Suitable where system reverse voltage stays below 125 V but higher forward surge tolerance is needed. | Choose 1N458A/TR if design margin allows reduced VRWM and benefits from increased current headroom. |
Compared with 1N459A/TR, the 1N459A (bulk) offers identical performance with manual handling trade-offs, while 1N458A/TR trades 50 V VRWM headroom for +45 mA IF - making it preferable in lower-voltage, higher-current switching nodes.
Availability
1N459A/TR is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T line clamping, and switching core driver applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N459A/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 1N459A/TR belongs to Microsemi's legacy JEDEC-registered switching diode family, engineered for military-grade signal integrity, fast recovery, and hermetic reliability in harsh-environment data interfaces.
FAQ
What is the maximum working peak reverse voltage (VRWM) specification for the 1N459A/TR?
The 1N459A/TR has a VRWM of 175 V, defined as the maximum continuous peak reverse voltage it can withstand across its full operating temperature range (-65°C to +150°C), excluding transients. This value is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0023 Rev. 1 and directly supports use in ±15 V RS-232 and 10 Base-T Ethernet interfaces where sustained common-mode voltages approach this threshold. The 1N459A/TR maintains ≤25 nA leakage at this VRWM and +25°C.
Is the 1N459A/TR qualified to MIL-PRF-19500/193 standards?
Yes, the 1N459A/TR is available in JAN-qualified versions meeting MIL-PRF-19500/193 Level J requirements, including rigorous environmental screening, lot traceability, and extended temperature testing. This qualification is explicitly stated in the "DESCRIPTION" section of T4-LDS-0023 Rev. 1. Commercial-grade 1N459A/TR units are not JAN-qualified but retain identical electrical specs and DO-35 packaging.
What does the "/TR" suffix indicate in 1N459A/TR?
The "/TR" suffix denotes tape-and-reel packaging per EIA-296 standard, enabling automated surface-mount assembly. It does not alter electrical or mechanical specifications of the 1N459A/TR die or DO-35 package. The base device remains identical to bulk 1N459A - same metallurgical bond, hermetic seal, VRWM, VF, and temperature ratings - with packaging optimized for high-volume PCB manufacturing.
How does the 1N459A/TR compare to the 1N457A/TR in terms of reverse voltage capability?
The 1N459A/TR provides significantly higher reverse voltage capability than the 1N457A/TR: VRWM is 175 V versus 60 V, and VRM is 200 V versus 70 V. This makes the 1N459A/TR suitable for higher-voltage data interfaces such as industrial RS-422 or legacy Ethernet PHYs, whereas the 1N457A/TR is limited to low-voltage logic-level switching. Both share identical VF (1.0 V max), IR (25 nA), and DO-35 packaging.
What is the forward voltage (VF) specification for the 1N459A/TR and under what test conditions is it measured?
The 1N459A/TR has a maximum forward voltage of 1.0 V at 100 mA forward current, measured under pulsed conditions: tp = 8.5 ms, maximum duty cycle 2%. This test condition avoids self-heating effects and reflects real-world performance in short-duration switching events like ESD clamping or digital signal steering. The 1N459A/TR also exhibits 1.2 V VF at -55°C, confirming stable conduction across its full military temperature range.
1N459A/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
1N459A/TR FAQ
1.How can I place an order for 1N459A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N459A/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 1N459A/TR reliable?
The price and inventory of 1N459A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N459A/TR is usually 5 days.
3.What payment methods are accepted for 1N459A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N459A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N459A/TR?
1N459A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N459A/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 1N459A/TR?
For technical support, including 1N459A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N459A/TR requirements.
6.How does Aetrix verify that 1N459A/TR is sourced from the original manufacturer or authorized distributors?
All 1N459A/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 1N459A/TR meets industry standards.
7.What is the process for return or replacement of 1N459A/TR?
All 1N459A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N459A/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 1N459A/TR part is unused and in its original packaging.
Return procedure for 1N459A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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