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Microchip Technology 1N458
- Part No.:
- 1N458
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N458.pdf
- Description:
- DIODE GEN PURP 150V 150MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,220
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Product details
Overview
1N458 from Microsemi is a hermetically sealed, metallurgically bonded silicon switching diode in DO-35 glass package, rated for 150 V peak reverse voltage (VRWM), 120 mA forward current (IF), 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 1N458 datasheet, 1N458 pinout, 1N458 application, or 1N458 equivalent, key selection criteria include VRWM (125 V), IF (120 mA), TJ range (–65°C to +150°C), hermetic DO-35 packaging, and JAN-level qualification per MIL-PRF-19500/193.
Technical Context
The 1N458 operates as a fast-switching signal diode with low junction capacitance and sub-10 ns recovery time (inferred from family specification and DO-35 metallurgical bonding), enabling use in 10 Mbps+ data line applications. Its double-plug DO-35 construction ensures mechanical stability and thermal reliability under repeated thermal cycling.
Designed for through-hole mounting, the device uses tin/lead or RoHS-compliant matte tin plating on copper-clad steel leads, with cathode polarity indicated by a blue body and black band marking. It supports operation across –65°C to +150°C junction temperature range without derating until +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 125 V - maximum continuous peak reverse voltage before breakdown in normal operation |
| IF | 120 mA - maximum repetitive forward current at +25°C, derated linearly to 0 at +150°C |
| VF @ 100 mA | 1.0 V max - ensures low conduction loss in signal routing and level-shifting circuits |
| TJ Range | –65°C to +150°C - enables deployment in military, aerospace, and industrial environments |
| Package | DO-35 - hermetically sealed glass case with flexible axial leads for high-density thru-hole assembly |
| IR @ VRWM | 25 nA max at +25°C - guarantees minimal leakage in high-impedance receive paths |
Pinout & Package
DO-35 glass package: hermetically sealed, axial-leaded, blue-bodied with black cathode band; cathode terminal marked; lead material is copper-clad steel plated with tin/lead or RoHS-compliant matte tin (commercial grade only); weight 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side in rectification or clamping; requires PCB trace capable of handling 120 mA continuous |
| Cathode | Forward current exit / reverse blocking terminal | Banded end; referenced to system ground or return path; critical for polarity-sensitive interface protection |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bonding | Enables stable junction integrity and <10 ns recovery in fast edge-rate digital interfaces |
| Hermetic DO-35 sealing | Prevents moisture ingress and long-term parameter drift in harsh or high-reliability environments |
| JAN qualification | Meets MIL-PRF-19500/193 requirements for screening, testing, and traceability in defense programs |
| Tight VF control | 1.0 V max at 100 mA ensures predictable voltage drop in logic-level translation and clamp circuits |
Applications
| RS-232 Interface Protection | Ethernet 10 Base-T Receiver Clamping |
|---|---|
Use Scenario: Protects UART transceivers against ESD and line transients in industrial serial communication links. IC Role / Device Role / Timing Role: Signal-level clamping diode placed between TX/RX lines and ground or VCC rail. Use Value: 125 V VRWM and 25 nA IR ensure minimal loading on 3–5 V logic lines while surviving ±15 kV contact discharge. | Use Scenario: Limits voltage excursions on differential pairs in legacy Ethernet PHY receivers. IC Role / Device Role / Timing Role: Fast-switching clamp protecting transformer-coupled inputs from overvoltage events. Use Value: Sub-10 ns recovery and low capacitance preserve 10 Mbps signal integrity without jitter accumulation. |
| Switching Core Driver Snubbing | LAN Transceiver Bias Steering |
Use Scenario: Suppresses inductive kickback in discrete gate-drive circuits for power MOSFETs. IC Role / Device Role / Timing Role: Freewheeling path for flyback energy during turn-off transitions. Use Value: 120 mA IF rating and 500 mW PD support intermittent 100 mA snubbing pulses without thermal runaway. | Use Scenario: Directs bias current in multi-port LAN hub transceivers with shared reference rails. IC Role / Device Role / Timing Role: Precision steering diode in analog bias network requiring stable VF and low leakage. Use Value: Tight 1.0 V VF tolerance and 1 µA IR at +150°C maintain channel matching across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148W | Higher IF (300 mA), lower VRWM (100 V), SOD-123 surface-mount package | Not suitable for thru-hole legacy designs or MIL-spec programs requiring DO-35 form factor | Select when board space is constrained and JEDEC 1N458 replacement isn't required |
| 1N458A (JAN) | Identical electrical specs but qualified to MIL-PRF-19500/193 Level JANTXV; tighter screening, lot traceability, extended temp validation | Required for defense/aerospace BOMs where JAN certification is mandated | Choose 1N458A when compliance with military procurement standards is mandatory |
Compared with 1N458, the 1N4148W offers higher current capability but lacks hermetic sealing and MIL qualification, while the 1N458A provides identical performance with certified reliability for mission-critical systems - making the base 1N458 optimal for commercial industrial designs needing proven DO-35 robustness without premium qualification cost.
Availability
1N458 is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T receiver clamping, and switching core driver snubbing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N458 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) specialized in high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N457A–1N459A series was developed to deliver MIL-qualified, hermetically sealed switching diodes for legacy and new-build systems demanding proven reliability in harsh environments.
FAQ
What is the maximum working peak reverse voltage (VRWM) for the 1N458?
The 1N458 has a VRWM of 125 V, meaning it can sustain up to 125 V of continuous reverse-bias voltage across its terminals within the specified operating temperature range. This value is confirmed in the Electrical Characteristics table of Microsemi's T4-LDS-0023 datasheet and defines the upper limit for safe blocking operation in signal routing and clamping applications involving the 1N458.
Is the 1N458 available in RoHS-compliant versions?
Yes, RoHS-compliant versions of the 1N458 are available for commercial-grade use only, with matte tin plating on copper-clad steel leads. The JAN-qualified version (1N458A) does not carry RoHS compliance due to its tin/lead plating requirement per MIL-PRF-19500/193. Both variants retain identical electrical specifications, including 1.0 V VF max and 125 V VRWM, ensuring design continuity when selecting the 1N458.
What package type does the 1N458 use, and how is polarity identified?
The 1N458 uses the DO-35 hermetically sealed glass package with axial leads. Polarity is identified by a black band on the blue-colored body, marking the cathode terminal. This marking aligns with JEDEC standard conventions and is visible during manual or automated optical inspection, ensuring correct orientation during placement of the 1N458 in high-density thru-hole assemblies.
How does the 1N458 differ from the 1N457 and 1N459 in terms of voltage ratings?
The 1N458 is rated for 125 V VRWM and 150 V VRM, positioning it between the 1N457 (60 V VRWM / 70 V VRM) and 1N459 (175 V VRWM / 200 V VRM). All three share identical forward characteristics - 1.0 V VF max at 100 mA, 25 nA IR at VRWM - making the 1N458 the optimal choice for 100–130 V signal-line protection where the 1N457 lacks margin and the 1N459 over-specifies voltage capability in the 1N458 application space.
Can the 1N458 be used in place of the 1N4148 in existing designs?
The 1N458 is not a direct substitute for the 1N4148 due to differences in package (DO-35 vs. DO-35-like but non-hermetic or alternate construction), qualification level (MIL-PRF-19500/193 vs. commercial), and VRWM (125 V vs. 100 V). While both are fast switching diodes, the 1N458 offers superior reliability and higher reverse voltage - use the 1N458 only where its specific ratings and hermetic sealing are required, not as a generic 1N4148 drop-in replacement.
1N458 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):
- 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 FAQ
1.How can I place an order for 1N458 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N458 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 reliable?
The price and inventory of 1N458 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N458 is usually 5 days.
3.What payment methods are accepted for 1N458?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N458 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N458?
1N458 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N458 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?
For technical support, including 1N458 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N458 requirements.
6.How does Aetrix verify that 1N458 is sourced from the original manufacturer or authorized distributors?
All 1N458 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 meets industry standards.
7.What is the process for return or replacement of 1N458?
All 1N458 units undergo pre-shipment inspection (PSI). If there is an issue with 1N458, 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 part is unused and in its original packaging.
Return procedure for 1N458:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N458 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
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1N4148TR
onsemi
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MMSD4148T1G
onsemi
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MMBD914LT3G
onsemi
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BAS16HT1G
onsemi
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1N914BWT
onsemi
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BAS21LT1G
onsemi
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LL4148
onsemi
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BAS16LT1G
onsemi
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MMSD914T1G
onsemi
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BAV21W-7-F
Diodes Incorporated
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