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Microchip Technology 1N755A
- Part No.:
- 1N755A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N755A.pdf
- Description:
- DIODE ZENER 7.5V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,038
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Product details
Overview
1N755A from Microsemi is a 500 mW, 7.5 V ±5% axial-leaded silicon Zener diode in DO-35 (DO-204AH) glass package, qualified to JANTX level per MIL-PRF-19500/127, with dynamic impedance of 4 Ω at 50 mA and temperature coefficient of +0.058 %/°C, used for precision voltage regulation in power supply reference circuits.
For engineers reviewing the 1N755A datasheet, 1N755A pinout, 1N755A application, or 1N755A equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (250 °C/W junction-to-lead), reverse leakage current (≤2 µA at 5.0 V), maximum Zener current (50 mA), and military qualification level.
Technical Context
The 1N755A operates as a two-terminal voltage reference device in reverse breakdown mode, with nominal Zener voltage of 7.5 V measured at 50 mA test current (IZT). Its metallurgically bonded construction ensures stable regulation across -65 °C to +175 °C operating temperature range.
It exhibits low dynamic impedance (4 Ω at IZT = 50 mA) and positive temperature coefficient (+0.058 %/°C), indicating increasing Zener voltage with rising temperature-characteristic of Zeners above ~5 V. Reverse leakage is specified ≤2 µA at VR = 5.0 V, confirming tight regulation near knee voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at IZT = 50 mA - defines regulated output voltage with 0.375 V tolerance band |
| Power Dissipation | 500 mW at TL = 50 °C - derates linearly to zero at 175 °C with 250 °C/W thermal resistance |
| Dynamic Impedance | 4 Ω at IZT = 50 mA - determines output voltage stability under load current variation |
| Reverse Leakage | ≤2 µA at VR = 5.0 V - ensures minimal error current before regulation onset |
| Temp. Coefficient | +0.058 %/°C - quantifies VZ drift magnitude per degree Celsius rise in junction temperature |
| Max Forward Voltage | 1.1 V at IF = 200 mA - relevant for forward-bias protection or polarity verification |
| Junction Temp Range | -65 °C to +175 °C - supports operation in extended industrial, aerospace, and defense environments |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased positively relative to cathode |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation polarity and voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/127 Qualification | JANTX-level qualification enables use in high-reliability defense and aerospace systems requiring traceable lot data and screening |
| Metallurgical Bond Construction | Eliminates interfacial delamination risk under thermal cycling, improving long-term parameter stability vs. alloyed Zeners |
| Low Capacitance | Minimizes signal coupling and noise injection in high-frequency reference or bias networks |
| ESD Robustness | Non-sensitive to ESD per MIL-STD-750 Method 1020 - reduces handling and assembly failure risk |
| Radiation Hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for space-qualified subsystems without added shielding |
Applications
| Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stable 7.5 V reference for linear regulator feedback or ADC reference buffer in military-grade power modules. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing precise, temperature-compensated DC bias point. Use Value: Delivers ±5% initial accuracy and <±0.058%/°C drift, enabling <1% total regulation error over -55 °C to +125 °C ambient. | Use Scenario: Clamping transient surges on 5 V logic rails in avionics interface circuits exposed to lightning-induced spikes. IC Role / Device Role / Timing Role: Passive overvoltage clamp absorbing energy above 7.5 V while limiting downstream voltage excursion. Use Value: Withstands 50 mA continuous Zener current and handles non-repetitive surge per IZSM rating, protecting downstream CMOS inputs. |
| Temperature-Stable Bias Network | Aerospace Sensor Excitation |
Use Scenario: Generating stable bias current for precision op-amp input stages in flight control analog signal conditioning. IC Role / Device Role / Timing Role: Current-source element via series resistor, leveraging predictable VZ and low ZZT for minimal current variation. Use Value: 4 Ω dynamic impedance ensures <0.2 mV/mA output change, maintaining sub-0.1% bias current stability across operating current range. | Use Scenario: Providing excitation voltage to RTD or strain gauge bridges in satellite payload telemetry systems. IC Role / Device Role / Timing Role: Low-noise, radiation-hardened voltage source powering bridge arms where long-term calibration drift must be minimized. Use Value: Inherent radiation hardness and -65 °C to +175 °C operation support unattended 15+ year mission life without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Same 7.5 V nominal, but commercial-grade only; ±5% tolerance; no MIL qualification; DO-41 package (larger, higher RθJA) | Lacks JANTX screening, thermal resistance (300 °C/W vs. 250 °C/W), and radiation hardness - unsuitable for flight hardware | Select only for cost-sensitive commercial designs where military reliability and extended temperature operation are not required |
| BZX85C7V5 | 7.5 V ±5%, 1.3 W rating, DO-41, commercial grade; higher power but no MIL spec; different Zener impedance (10 Ω typical) | Higher power dissipation enables higher current clamping, but lacks ESD robustness and temperature coefficient consistency of 1N755A | Prefer for high-current clamp roles in industrial controls; avoid where low-impedance reference or radiation tolerance is mandatory |
Compared with 1N4734A and BZX85C7V5, the 1N755A provides superior thermal performance (250 °C/W), verified radiation hardness, and JANTX-level screening-making it the sole choice for aerospace, defense, and high-reliability embedded systems requiring guaranteed parametric stability over lifetime.
Availability
1N755A is available at Aetrix Electronics and suitable for aerospace power references, defense-grade overvoltage clamps, and radiation-hardened sensor excitation circuits requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for 1N755A 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 military-qualified analog and mixed-signal components.
The 1N755A belongs to Microsemi's legacy MIL-PRF-19500/127-qualified Zener diode family, designed specifically for voltage regulation in mission-critical defense, aerospace, and industrial control systems demanding long-term parametric stability and environmental resilience.
FAQ
What is the Zener voltage tolerance and test condition for the 1N755A?
The 1N755A has a nominal Zener voltage of 7.5 V with ±5% tolerance, measured at a test current (IZT) of 50 mA and ambient temperature of 25 °C. Voltage readings are taken 20 seconds after applying the dc test current to ensure thermal stabilization, per Microsemi T4-LDS-0288 specification.
Is the 1N755A suitable for surface-mount applications?
No, the 1N755A is packaged in the axial-leaded DO-35 (DO-204AH) glass case and is intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the MELF-packaged 1N755AUR-1 in DO-213AA, which shares identical electrical specifications but requires reflow-compatible assembly processes.
What is the maximum reverse leakage current specification for the 1N755A?
The 1N755A specifies a maximum reverse leakage current (IR) of 2 µA at a reverse voltage (VR) of 5.0 V and 25 °C. This low leakage confirms sharp knee behavior and supports accurate low-current regulation in precision bias networks where error current must remain below nanoscale thresholds.
Does the 1N755A have radiation hardness certification?
Yes, the 1N755A is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its metallurgically bonded DO-35 construction and process design provide tolerance to total ionizing dose (TID) and single-event effects (SEE) without additional shielding-making it suitable for satellite and high-altitude avionics applications.
How does the temperature coefficient of the 1N755A affect its regulation performance?
The 1N755A has a positive temperature coefficient of +0.058 %/°C, meaning its Zener voltage increases by approximately 4.35 mV per °C rise in junction temperature. This characteristic must be accounted for in wide-temperature-range designs; however, it enables predictable compensation when paired with negative-TC components in reference circuits.
1N755A 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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 6 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N755A FAQ
1.How can I place an order for 1N755A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N755A 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 1N755A reliable?
The price and inventory of 1N755A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N755A is usually 5 days.
3.What payment methods are accepted for 1N755A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N755A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N755A?
1N755A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N755A 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 1N755A?
For technical support, including 1N755A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N755A requirements.
6.How does Aetrix verify that 1N755A is sourced from the original manufacturer or authorized distributors?
All 1N755A 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 1N755A meets industry standards.
7.What is the process for return or replacement of 1N755A?
All 1N755A units undergo pre-shipment inspection (PSI). If there is an issue with 1N755A, 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 1N755A part is unused and in its original packaging.
Return procedure for 1N755A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N755A Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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