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Microchip Technology 1N751
- Part No.:
- 1N751
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N751.pdf
- Description:
- DIODE ZENER 5.1V 400MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,724
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Product details
Overview
1N751 from Microsemi is a 500 mW, 5.1 V ±5% silicon Zener diode in DO-35 glass axial package, qualified to JANTXV level per MIL-PRF-19500/127, with dynamic impedance of 14 Ω at 50 mA and temperature coefficient of –0.030%/°C at 25°C, used for precision voltage regulation in military power supplies and reference circuits.
For engineers reviewing the 1N751 datasheet, 1N751 pinout, 1N751 application, or 1N751 equivalent, this page delivers verified electrical specs, thermal derating behavior, military qualification status, DO-35 mechanical dimensions, and RoHS-compliant commercial alternatives - all tied explicitly to the 1N751A-1 ordering variant.
Technical Context
The 1N751 operates as a reverse-biased voltage reference with nominal Zener voltage of 5.1 V at IZT = 50 mA, exhibiting low dynamic impedance (14 Ω) and a negative temperature coefficient (–0.030%/°C) below 5 V, enabling stable regulation across –65°C to +175°C junction temperature range.
It features an internal metallurgical bond, hermetically sealed DO-35 glass package, cathode band polarity marking, and meets MIL-STD-750 ESD immunity (Method 1020), with maximum reverse current of 5 µA at 2.0 V and forward voltage of 1.1 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 5.1 V ±5% at IZT = 50 mA - defines regulated output voltage under standard test conditions |
| Dynamic Impedance ZZT | 14 Ω at IZT = 50 mA - determines output voltage stability under load current variation |
| Max Reverse Current IR | 5 µA at VR = 2.0 V - specifies leakage before breakdown, critical for low-power bias networks |
| Power Dissipation PM(AV) | 0.5 W at TL = 50°C (lead temp), derates linearly to zero at 175°C - sets thermal design margin for PCB mounting |
| Temp Coefficient αVZ | –0.030%/°C at 25°C, +0.030%/°C at +150°C - quantifies voltage drift over operating temperature range |
| Junction-to-Lead RθJL | 250 °C/W - enables thermal modeling when leads are heatsinked or soldered to copper planes |
| Forward Voltage VF | 1.1 V at IF = 200 mA - defines conduction loss if used in forward-biased protection or clamp roles |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed, cathode indicated by single black band; body diameter 1.40–2.29 mm, overall length 25.4–38.1 mm, lead diameter 0.46–0.58 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Unbanded end | Connected to lower potential node; forward conduction path when biased >1.1 V |
| Cathode | Banded end | Connected to higher potential node during Zener operation; defines regulation reference point |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/127 qualification | JANTXV-level reliability and screening for aerospace and defense systems requiring extended lifetime and radiation tolerance |
| Metallurgical bond construction | Enhanced thermal cycling endurance and long-term parameter stability vs. alloyed or diffused junctions |
| Low capacitance & ESD immunity | Minimal parasitic capacitance and non-sensitive to ESD per MIL-STD-750 Method 1020 - suitable for noise-sensitive analog references |
| RoHS-compliant option | e3 suffix available for commercial-grade variants - enables compliance without sacrificing DO-35 mechanical robustness |
Applications
| Military Power Supply Regulation | High-Reliability Reference Circuit |
|---|---|
Use Scenario: Regulating +5 V rail in airborne avionics power modules exposed to –55°C to +125°C ambient. IC Role / Device Role / Timing Role: Zener diode providing stable 5.1 V reference for op-amp feedback and regulator error amplifiers. Use Value: Maintains <±2% output deviation over full temperature range due to –0.030%/°C TC and 14 Ω ZZT, reducing calibration drift. | Use Scenario: Biasing precision current sources in radiation-hardened sensor front-ends. IC Role / Device Role / Timing Role: Voltage reference element in two-terminal shunt regulator topology with minimal external components. Use Value: Inherent radiation hardness per MicroNote 050 and 5 µA max leakage at 2 V enable stable biasing in high-dose environments. |
| Industrial Temperature Sensor Compensation | Legacy Equipment Voltage Clamp |
Use Scenario: Compensating thermistor-based temperature measurement circuits in oil & gas downhole tools. IC Role / Device Role / Timing Role: Stable Zener reference compensating for sensor nonlinearity across –65°C to +175°C junction range. Use Value: Operates reliably at 175°C junction temperature with 250 °C/W RθJL, eliminating need for active cooling in sealed housings. | Use Scenario: Overvoltage clamping on 5 V logic rails in legacy industrial controllers using through-hole assembly. IC Role / Device Role / Timing Role: Shunt protection device limiting transient excursions above 5.1 V during EFT or surge events. Use Value: Axial DO-35 leads allow direct soldering to thick-copper ground planes, improving surge energy dissipation vs. SMT alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5231B | 5.1 V ±5%, 500 mW, DO-35, but commercial-only, no MIL-qualified variants | Lacks JANTXV screening and radiation hardness documentation | Select when cost sensitivity outweighs military reliability requirements |
| BZX55C5V1 | 5.1 V ±5%, 500 mW, DO-35, RoHS-compliant, but not MIL-PRF-19500 qualified | No documented ESD immunity per MIL-STD-750 or thermal resistance specs | Prefer for commercial industrial designs needing RoHS compliance without military testing |
Compared with 1N751, the 1N5231B offers identical electrical specs but lacks JANTXV screening and radiation data, while BZX55C5V1 provides RoHS compliance and tighter commercial availability but omits military thermal and ESD validation - making 1N751 the only choice for flight-critical or high-radiation environments.
Availability
1N751 is available at Aetrix Electronics and suitable for military power supply regulation, high-reliability reference circuits, and industrial temperature sensor compensation requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for 1N751 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, radiation-hardened, and aerospace-grade analog and discrete components.
The 1N751 belongs to Microsemi's legacy MIL-PRF-19500/127 qualified Zener diode family, designed specifically for voltage regulation in mission-critical defense, space, and industrial control systems where parameter stability and long-term reliability are mandatory.
FAQ
What is the Zener voltage tolerance and test condition for the 1N751?
The 1N751 has a nominal Zener voltage of 5.1 V with ±5% tolerance, measured at IZT = 50 mA and 20 seconds after dc test current application. This tolerance is defined by the "A" suffix in the part nomenclature (1N751A-1) and applies across the full operating temperature range of –65°C to +175°C.
Is the 1N751 suitable for surface-mount assembly?
No - the 1N751 is packaged exclusively in the axial-leaded DO-35 (DO-204AH) glass case and is not compatible with surface-mount reflow processes. For MELF-style SMT equivalents, Microsemi offers the 1N751AUR-1 in DO-213AA package, which shares identical electrical specs but requires different board layout and soldering profile.
Does the 1N751 have documented radiation hardness?
Yes - the 1N751 is inherently radiation hard as described in Microsemi MicroNote 050, and its JANTXV qualification per MIL-PRF-19500/127 includes radiation survivability testing. This makes the 1N751 appropriate for use in low-earth orbit satellite subsystems and nuclear instrumentation where total ionizing dose (TID) resistance is required.
What is the maximum reverse current specification for the 1N751?
The 1N751 has a maximum reverse current (IR) of 5 µA at VR = 2.0 V, measured at 25°C. This low leakage supports accurate biasing in high-impedance reference networks and ensures minimal power loss in standby modes of military power converters.
Can the 1N751 be used in forward conduction mode?
Yes - the 1N751 exhibits a maximum forward voltage (VF) of 1.1 V at IF = 200 mA, allowing it to function as a low-drop rectifier or clamp in forward-biased configurations. However, its primary design intent and qualification are for reverse-biased Zener regulation, so forward-mode use should be limited to non-critical protection roles.
1N751 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±10%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N751 FAQ
1.How can I place an order for 1N751 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N751 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 1N751 reliable?
The price and inventory of 1N751 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N751 is usually 5 days.
3.What payment methods are accepted for 1N751?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N751 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N751?
1N751 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N751 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 1N751?
For technical support, including 1N751 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N751 requirements.
6.How does Aetrix verify that 1N751 is sourced from the original manufacturer or authorized distributors?
All 1N751 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 1N751 meets industry standards.
7.What is the process for return or replacement of 1N751?
All 1N751 units undergo pre-shipment inspection (PSI). If there is an issue with 1N751, 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 1N751 part is unused and in its original packaging.
Return procedure for 1N751:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N751 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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