My Inquiry
My Account
Microchip Technology 1N5225A/TR
- Part No.:
- 1N5225A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5225A/TR.pdf
- Description:
- DIODE ZENER 3V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,843
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5225A/TR from Microsemi is a 3.0 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 1600 Ω dynamic impedance at 0.25 mA, operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5225A/TR datasheet, 1N5225A/TR pinout, 1N5225A/TR application, or 1N5225A/TR equivalent, key selection criteria include its 3.0 V nominal Zener voltage, ±10% tolerance (A suffix), 500 mW power rating at 25°C, DO-35 mechanical form factor, and temperature coefficient of –0.075 %/°C - all critical for stable biasing and regulation in industrial and aerospace designs.
Technical Context
This device operates in reverse breakdown mode with cathode band indicating polarity; regulation occurs when the banded end is held positive relative to the anode. Its Zener voltage is specified at 20 mA test current (IZT), and dynamic impedance is measured at both IZT and 0.25 mA (IZK) to ensure sharp knee characteristics and unit stability.
The 1N5225A/TR exhibits a negative temperature coefficient (–0.075 %/°C), making it suitable for temperature-compensated references when paired with positive-TC components. Thermal resistance is 250 °C/W junction-to-lead (3/8″ lead length) and 310 °C/W junction-to-ambient on FR4 board, defining derating requirements above 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.0 V @ 20 mA - defines regulated output voltage under standard test conditions |
| Zener Tolerance | ±10% (A suffix) - sets absolute voltage accuracy window: 2.7 V to 3.3 V |
| Power Dissipation | 500 mW at 25°C - maximum steady-state power before thermal derating applies |
| Dynamic Impedance | 1600 Ω @ IZK = 0.25 mA - indicates regulation stiffness at low currents; higher value implies greater voltage variation with load changes |
| Temperature Coefficient | –0.075 %/°C - quantifies voltage drift per degree Celsius rise; enables thermal error budgeting |
| Reverse Leakage | 100 μA @ VR = 1.0 V - defines minimum holding current threshold before regulation onset |
| Forward Voltage | ≤1.5 V @ 200 mA - ensures predictable conduction in forward-biased protection or clamping roles |
Pinout & Package
Hermetically sealed axial-lead DO-35 (DO-204AH) glass package with tin-lead or RoHS-compliant matte-tin plating; cathode identified by single black band; weight 0.2 g; solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries reverse leakage current and forward conduction current |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation reference point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and electrical interchangeability across qualified suppliers |
| –65°C to +175°C operating range | Supports deployment in extreme environments including aerospace, downhole, and military systems |
| RoHS-compliant option (e3 suffix) | Enables compliance with environmental directives without sacrificing performance or reliability |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions beyond standard static-safe practices |
| Inherently radiation-hardened | Validated per MicroNote 050 for total ionizing dose (TID) resilience in space applications |
Applications
| Low-Power Voltage Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 3.0 V bias for op-amp input stages or ADC reference dividers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC operating point independent of supply variation. Use Value: Delivers ±10% voltage accuracy over –65°C to +175°C with minimal self-heating impact due to 500 mW rating and low thermal resistance. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 3.3 V logic rail in industrial control panels. IC Role / Device Role / Timing Role: Passive clamp limiting voltage excursion to ≤3.3 V while diverting excess current to ground. Use Value: Leverages sharp Zener knee (verified via dual-point impedance testing) to activate clamping rapidly without overshoot or latch-up risk. |
| Power Supply Feedback | Temperature-Compensated Reference |
Use Scenario: Setting output voltage in isolated flyback converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Precision shunt regulator generating error signal proportional to output deviation. Use Value: Stable 3.0 V reference enables <1% output regulation accuracy; DO-35 axial leads simplify through-hole PCB layout and thermal management. | Use Scenario: Building a compensated reference string with positive-TC components (e.g., forward-biased diodes) in precision sensor front-ends. IC Role / Device Role / Timing Role: Negative-TC element counterbalancing positive drift in adjacent circuitry. Use Value: –0.075 %/°C coefficient allows predictable cancellation of thermal errors across –65°C to +175°C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal voltage, same ±10% tolerance, 1 W power rating, DO-41 package | Higher power handling but larger footprint; less suitable for space-constrained or high-temp-density layouts | Select when >500 mW dissipation margin is required and board area permits DO-41 mounting |
| MMBZ5225BS | 3.0 V, ±10%, SOT-23 surface-mount package, 200 mW rating | Enables automated assembly and smaller PCB area but reduces thermal mass and power capability | Select for compact, high-volume consumer designs where reflow compatibility and size outweigh power/temperature needs |
Compared with 1N4728A and MMBZ5225BS, the 1N5225A/TR offers optimal balance of voltage accuracy (3.0 V), thermal robustness (–65°C to +175°C), and axial-lead mechanical reliability in legacy or high-reliability through-hole systems - without requiring PCB redesign or derating compromises.
Availability
1N5225A/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp, and power supply feedback applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5225A/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, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N52xx series was designed for precision voltage regulation in mission-critical aerospace, defense, and industrial systems where long-term stability, wide temperature operation, and JEDEC-standardized interchangeability are mandatory.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5225A/TR?
The 1N5225A/TR has a nominal Zener voltage of 3.0 V with a tolerance of ±10%, indicated by the "A" suffix. This means its actual breakdown voltage falls between 2.7 V and 3.3 V when tested at 20 mA (IZT) and 25°C. The tolerance is guaranteed per JEDEC specification for parts marked with A or B suffixes.
What package type and marking does the 1N5225A/TR use?
The 1N5225A/TR uses the DO-35 (DO-204AH) glass axial-lead package with hermetic sealing and tin-lead or RoHS-compliant matte-tin plating. It is marked with the full part number "1N5225A" and features a single black cathode band on the banded end. The "TR" suffix denotes tape-and-reel packaging per EIA-296 standard.
What is the maximum power dissipation and thermal derating behavior of the 1N5225A/TR?
The 1N5225A/TR is rated for 500 mW power dissipation at 25°C ambient or lead temperature. Derating begins linearly above 25°C at 4.0 mW/°C (based on 250 °C/W junction-to-lead thermal resistance). On FR4 board with specified copper pads, derating starts at 3.23 mW/°C (310 °C/W junction-to-ambient), reaching zero dissipation at 185°C.
How does the temperature coefficient of the 1N5225A/TR affect its performance?
The 1N5225A/TR has a temperature coefficient of –0.075 %/°C, meaning its Zener voltage decreases by approximately 2.25 mV per °C rise across its 3.0 V nominal value. This negative TC is confirmed for operation between 25°C and 125°C and supports predictable thermal error modeling in precision reference designs.
Is the 1N5225A/TR suitable for high-reliability or aerospace applications?
Yes - the 1N5225A/TR is inherently radiation-hardened per MicroNote 050 and qualified for operation from –65°C to +175°C. It supports military screening levels (JAN, JANTX, etc.) when ordered with appropriate prefixes and "–1" suffix, and its DO-35 construction meets JEDEC standards for long-term reliability in harsh environments.
1N5225A/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):
- 3 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 950 mV
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5225A/TR FAQ
1.How can I place an order for 1N5225A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5225A/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 1N5225A/TR reliable?
The price and inventory of 1N5225A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5225A/TR is usually 5 days.
3.What payment methods are accepted for 1N5225A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5225A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5225A/TR?
1N5225A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5225A/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 1N5225A/TR?
For technical support, including 1N5225A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5225A/TR requirements.
6.How does Aetrix verify that 1N5225A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5225A/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 1N5225A/TR meets industry standards.
7.What is the process for return or replacement of 1N5225A/TR?
All 1N5225A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5225A/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 1N5225A/TR part is unused and in its original packaging.
Return procedure for 1N5225A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5225A/TR 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
