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Microchip Technology 1N5268A/TR
- Part No.:
- 1N5268A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5268A/TR.pdf
- Description:
- DIODE ZENER 82V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,829
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Product details
Overview
1N5268A/TR from Microsemi is a 500 mW glass axial-lead Zener diode with nominal Zener voltage of 82 V, ±10% tolerance (A suffix), 1.5 mA test current, and 2000 Ω maximum Zener impedance at knee current - used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5268A/TR datasheet, 1N5268A/TR pinout, 1N5268A/TR application, or 1N5268A/TR equivalent, this part serves as a stable, temperature-compensated voltage reference in industrial sensor signal conditioning, legacy power supply feedback paths, and ESD-tolerant bias networks where DO-35 axial mounting and RoHS-compliant plating are required.
Technical Context
The 1N5268A/TR operates as a two-terminal reverse-biased voltage regulator, maintaining 82 V across its terminals within ±10% tolerance when reverse current ranges from 0.25 mA to 1.5 mA. Its DO-35 glass package provides hermetic sealing and inherent radiation hardness per MicroNote 050.
It exhibits a +0.098 %/°C temperature coefficient (αVZ), measured at IZT = 1.5 mA between 25°C and 125°C, and delivers minimal capacitance (<1.5 pF typical) with nonsensitive ESD behavior per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 82 V - defines regulated output voltage under 1.5 mA test current |
| Zener Tolerance | ±10% (A suffix) - sets worst-case regulation band from 73.8 V to 90.2 V |
| Power Dissipation | 500 mW at 25°C - limits continuous thermal load on PCB traces or leads |
| Zener Impedance | 2000 Ω max at IZK = 0.25 mA - determines regulation stiffness near knee region |
| Temp Coefficient αVZ | +0.098 %/°C - quantifies voltage drift over -65°C to +175°C operating range |
| Max Reverse Current | 0.1 μA at VR = 66 V - ensures low leakage in high-impedance bias networks |
| Forward Voltage | 1.5 V max at 200 mA - defines conduction drop during forward surge events |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to lower-potential side in Zener regulation; carries reverse current during regulation |
| Cathode | Regulated output node | Banded end; held at stable 82 V relative to anode when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and thermal interchangeability with legacy 1N52xx designs |
| Hermetically sealed glass body | Prevents moisture ingress and long-term parameter drift in humid environments |
| Radiation-hardened per MicroNote 050 | Supports operation in aerospace and defense systems with total ionizing dose >100 krad(Si) |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection in handling and assembly |
| Tape-and-reel packaging (TR suffix) | Enables automated pick-and-place placement without manual lead forming |
Applications
| Voltage Reference for Analog Sensors | Overvoltage Clamp in Legacy Power Supplies |
|---|---|
Use Scenario: Provides stable 82 V reference for RTD or strain gauge bridge excitation in industrial process transmitters. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise bias point independent of supply variation. Use Value: Enables <1% full-scale error in 4–20 mA loop-powered sensors despite ±15% input rail fluctuation. | Use Scenario: Clamps transient spikes on +100 V DC bus in telecom line card power stages. IC Role / Device Role / Timing Role: Standalone Zener clamp absorbing energy during inductive kickback or lightning-induced surges. Use Value: Limits peak voltage to ≤88 V (82 V + 10% tolerance) protecting downstream MOSFET gate drivers. |
| ESD-Tolerant Bias Network | Temperature-Stable Feedback Node |
Use Scenario: Sets bias point for high-impedance op-amp input stage in medical EEG front-end amplifiers. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA max) reference source minimizing input offset drift. Use Value: Maintains <2 nA input bias current contribution across -20°C to +70°C ambient range. | Use Scenario: Forms upper leg of voltage divider in isolated flyback converter feedback path. IC Role / Device Role / Timing Role: Temperature-compensated reference element improving output regulation accuracy over temperature. Use Value: Reduces output voltage drift from ±3.5% to ±1.2% over -40°C to +105°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5268B/TR | ±5% tolerance (B suffix) vs. ±10% (A); same 82 V nominal, 2000 Ω ZZK, +0.098 %/°C αVZ | Higher precision required in closed-loop feedback where tighter regulation band reduces control loop error | Select 1N5268B/TR when system-level voltage accuracy must stay within ±4.1 V instead of ±8.2 V |
| MMBZ5268AL-7-F | Surface-mount SOD-123 package; same 82 V, ±10%, but 1.5 mA IZT and 2000 Ω ZZK; RoHS only, no leaded option | Used in space-constrained PCBs where axial leads conflict with automated assembly or height restrictions | Select MMBZ5268AL-7-F when board real estate or reflow compatibility outweighs axial-mounting flexibility |
Compared with 1N5268A/TR, the 1N5268B/TR improves voltage accuracy at identical thermal and electrical stress, while MMBZ5268AL-7-F trades axial-leaded serviceability for SMT manufacturability - neither is pin-compatible due to differing packages and termination styles.
Availability
1N5268A/TR is available at Aetrix Electronics and suitable for industrial sensor calibration, telecom power clamping, and medical device bias networks requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for 1N5268A/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xx series was designed specifically for robust, low-power voltage regulation in mission-critical analog subsystems where long-term stability, ESD immunity, and wide-temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5268A/TR?
The 1N5268A/TR has a nominal Zener voltage of 82 V with ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual breakdown voltage falls between 73.8 V and 90.2 V when tested at 1.5 mA reverse current and 25°C ambient temperature. The tolerance is guaranteed per JEDEC standards for parts marked with A suffix, and applies across the full operating temperature range of -65°C to +175°C.
Does the 1N5268A/TR have a specified Zener impedance at knee current?
Yes, the 1N5268A/TR has a maximum Zener impedance (ZZK) of 2000 Ω at IZK = 0.25 mA, as confirmed in the Electrical Characteristics table on page 2 of the Microsemi datasheet. This value reflects dynamic resistance near the onset of breakdown and directly impacts regulation stability in low-current bias applications. The 2000 Ω limit ensures predictable voltage deviation under light-load conditions typical in reference networks.
What is the temperature coefficient of the 1N5268A/TR and how is it measured?
The 1N5268A/TR has a temperature coefficient (αVZ) of +0.098 %/°C, measured between 25°C and 125°C at its rated test current of 1.5 mA. This coefficient quantifies how the Zener voltage changes per degree Celsius and is critical for predicting regulation drift in thermally varying environments. The value is derived from controlled thermal stabilization and voltage measurement per Microsemi's test procedure outlined in Note 3 of the datasheet.
Is the 1N5268A/TR RoHS compliant?
Yes, the 1N5268A/TR is RoHS compliant, as confirmed by the "e3" designation referenced in the Microsemi product family description and supported by its matte-tin plating per MIL-STD-750 Method 2026. The "TR" suffix denotes tape-and-reel packaging, and RoHS compliance applies to both leaded (tin-lead) and RoHS-compliant versions - the latter uses annealed matte-tin finish without lead content.
What is the maximum power dissipation rating for the 1N5268A/TR at 25°C?
The 1N5268A/TR is rated for 500 mW maximum power dissipation at 25°C ambient temperature, as stated in the Maximum Ratings section of the Microsemi datasheet. Derating is required above 25°C - for example, at 75°C ambient, usable power drops to approximately 375 mW based on the 250 °C/W junction-to-lead thermal resistance and standard 3/8″ lead length mounting condition.
1N5268A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 82 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 330 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 59 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5268A/TR FAQ
1.How can I place an order for 1N5268A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5268A/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 1N5268A/TR reliable?
The price and inventory of 1N5268A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5268A/TR is usually 5 days.
3.What payment methods are accepted for 1N5268A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5268A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5268A/TR?
1N5268A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5268A/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 1N5268A/TR?
For technical support, including 1N5268A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5268A/TR requirements.
6.How does Aetrix verify that 1N5268A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5268A/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 1N5268A/TR meets industry standards.
7.What is the process for return or replacement of 1N5268A/TR?
All 1N5268A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5268A/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 1N5268A/TR part is unused and in its original packaging.
Return procedure for 1N5268A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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