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Microchip Technology 1N5256A/TR
- Part No.:
- 1N5256A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5256A/TR.pdf
- Description:
- DIODE ZENER 30V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,355
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Product details
Overview
1N5256A/TR from Microsemi is a 30 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 49 mA test current and 600 Ω dynamic impedance at IZK, operating across –65°C to +175°C for voltage regulation in low-power analog reference and protection circuits.
For engineers reviewing the 1N5256A/TR datasheet, 1N5256A/TR pinout, 1N5256A/TR application, or 1N5256A/TR equivalent, this part serves as a JEDEC-registered, RoHS-compliant (e3), tape-and-reel packaged Zener regulator with verified thermal resistance (250 °C/W junction-to-lead), stable temperature coefficient (+0.091 %/°C), and cathode-band polarity marking.
Technical Context
This discrete Zener diode operates in reverse-bias breakdown mode to maintain a stable 30 V reference across varying load currents (IZK = 0.25 mA to IZT = 49 mA) and ambient temperatures. Its DO-35 glass package provides hermetic sealing and inherent radiation hardness per MicroNote 050.
It exhibits minimal capacitance (typical <4 pF per Figure 2), nonsensitive ESD behavior (MIL-STD-750 Method 1020), and forward voltage ≤1.5 V at 200 mA - enabling use in precision biasing, overvoltage clamping, and low-noise reference generation without parasitic coupling concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30 V @ 49 mA test current - defines primary regulation point under standard bias |
| Zener Tolerance | ±10% (A suffix) - sets worst-case output range (27–33 V) for design margining |
| Power Dissipation | 500 mW at 25°C - limits continuous power handling before thermal derating applies |
| Zener Impedance | 600 Ω @ IZK = 0.25 mA - indicates regulation stiffness near knee voltage |
| Temp. Coefficient | +0.091 %/°C - quantifies drift magnitude over temperature for stability-critical references |
| Operating Temp. | –65°C to +175°C - supports aerospace, downhole, and industrial environments |
| Reverse Current | ≤0.1 μA @ VR = 22.5 V - ensures low leakage in high-impedance bias networks |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by a single 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 | Non-banded lead | Connected to lower-potential node; reverse-biased operation requires this terminal to be more negative than cathode |
| Cathode | Banded lead | Connected to regulated output node; Zener breakdown occurs when cathode is ≥30 V positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xx series | Ensures cross-manufacturer compatibility and standardized electrical limits per JEDEC spec |
| Hermetic glass DO-35 package | Provides long-term reliability and moisture resistance without conformal coating |
| Inherent radiation hardness | Validated per MicroNote 050 - suitable for space-qualified and nuclear instrumentation designs |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Tape-and-reel packaging (TR suffix) | Enables automated SMT placement despite axial-leaded form factor via carrier tape feeding |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Providing stable 30 V reference to precision op-amp bias networks in industrial transmitters. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, sinking excess current to hold node voltage at 30 V ±10%. Use Value: Enables accurate 4–20 mA loop calibration with <0.1 μA leakage ensuring minimal error contribution from reference path. | Use Scenario: Protecting ADC input pins from transient overvoltage in automotive pressure sensor modules. IC Role / Device Role / Timing Role: Functions as passive clamp, conducting when input exceeds 30 V to limit voltage swing. Use Value: Prevents latch-up or damage using 600 Ω dynamic impedance to absorb surge energy without significant overshoot. |
| Low-Power Power Supply Regulation | Temperature-Stable Bias Generator |
Use Scenario: Regulating auxiliary 30 V rail in battery-powered medical diagnostic equipment. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant voltage across load while dissipating variable power. Use Value: Delivers stable output across –40°C to +85°C operating range with +0.091 %/°C drift, minimizing recalibration needs. | Use Scenario: Generating temperature-compensated bias current for RF amplifier stages. IC Role / Device Role / Timing Role: Zener diode supplies reference voltage to current mirror circuit with known tempco. Use Value: Enables predictable bias shift (+0.091 %/°C) that can be actively compensated in feedback loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 30 V, ±5%, 1 W DO-41 package; higher power rating but larger footprint and different thermal resistance (125 °C/W) | Suitable for higher-current regulation where board space allows larger axial package | Select when >500 mW dissipation is required and DO-41 mounting is acceptable |
| MMBZ5256BS | 30 V, ±5%, 200 mW SOT-23 package; surface-mount, lower power, different thermal path and polarity marking | Preferred for space-constrained PCBs requiring automated reflow assembly | Select when footprint reduction and SMT process compatibility outweigh axial-lead serviceability |
Compared with 1N5256A/TR, 1N4745A offers higher power handling but requires layout revision for DO-41, while MMBZ5256BS enables miniaturization at the cost of reduced power and different thermal performance - choice depends on board area, dissipation needs, and assembly method.
Availability
1N5256A/TR is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and low-power regulation applications requiring stable component supply across aerospace, industrial control, and medical electronics programs.
Supply support for 1N5256A/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, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N52xx series was designed for general-purpose, high-stability Zener regulation in harsh-environment systems where hermetic sealing, wide temperature range, and JEDEC standardization are critical.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5256A/TR?
The 1N5256A/TR has a nominal Zener voltage of 30 V with a ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual breakdown voltage falls between 27 V and 33 V at the specified test current of 49 mA, supporting robust design margining in voltage reference applications.
What package type and marking does the 1N5256A/TR use?
The 1N5256A/TR uses a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package. Polarity is marked with a single cathode band on the banded end, and the full part number "1N5256A" is laser-marked or etched on the glass body per standard Microsemi labeling practice.
Does the 1N5256A/TR meet RoHS requirements?
Yes - the 1N5256A/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5256Ae3/TR). The base part number without "e3" uses traditional tin-lead plating; however, the TR suffix confirms tape-and-reel packaging format regardless of plating type.
What is the maximum reverse leakage current for the 1N5256A/TR?
The 1N5256A/TR has a maximum reverse leakage current of 0.1 μA when measured at VR = 22.5 V (75% of nominal Zener voltage), as specified in the Electrical Characteristics table. This ultra-low leakage supports high-impedance bias networks without introducing measurable error.
How does the temperature coefficient affect the 1N5256A/TR's performance?
The 1N5256A/TR has a temperature coefficient of +0.091 %/°C, meaning its Zener voltage increases by approximately 27.3 mV per 10°C rise above 25°C. This predictable positive drift allows designers to compensate in analog circuits or select it where monotonic drift is preferable to zero-TC alternatives.
1N5256A/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):
- 30 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 22 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)
1N5256A/TR FAQ
1.How can I place an order for 1N5256A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5256A/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 1N5256A/TR reliable?
The price and inventory of 1N5256A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5256A/TR is usually 5 days.
3.What payment methods are accepted for 1N5256A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5256A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5256A/TR?
1N5256A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5256A/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 1N5256A/TR?
For technical support, including 1N5256A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5256A/TR requirements.
6.How does Aetrix verify that 1N5256A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5256A/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 1N5256A/TR meets industry standards.
7.What is the process for return or replacement of 1N5256A/TR?
All 1N5256A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5256A/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 1N5256A/TR part is unused and in its original packaging.
Return procedure for 1N5256A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5256A/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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