My Inquiry
My Account
Microchip Technology 1N5226A
- Part No.:
- 1N5226A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5226A.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,020
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5226A from Microsemi is a 3.3 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 28 Ω dynamic impedance at IZT, used for low-power voltage regulation and reference in analog power supplies, sensor biasing, and overvoltage protection circuits.
For engineers reviewing the 1N5226A datasheet, 1N5226A pinout, 1N5226A application, or 1N5226A equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (−0.070 %/°C), RoHS-compliant plating options, and direct alternatives with documented tolerance and impedance differences.
Technical Context
The 1N5226A operates as a two-terminal voltage reference device with cathode-banded polarity, requiring reverse-bias operation where the banded end is positive relative to the anode. Its regulation stability relies on controlled Zener breakdown at 3.3 V with 20 mA test current and 28 Ω dynamic impedance measured at IZK = 0.25 mA.
Thermal performance is defined by 250 °C/W junction-to-lead resistance at 10 mm lead length and 310 °C/W junction-to-ambient on FR4 board; maximum steady-state power drops to 0.48 W at TA < 25 °C under specified PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at 20 mA test current - defines stable regulation point for low-voltage reference design |
| Zener Tolerance | ±10% (A suffix) - sets worst-case output range of 2.97–3.63 V at 25 °C |
| Dynamic Impedance | 28 Ω at IZT - determines load regulation error under varying current demand |
| Max Reverse Current | 100 μA at VR = 2.5 V - specifies leakage level below breakdown threshold |
| Temp. Coefficient αVZ | −0.070 %/°C - quantifies voltage drift with temperature; negative sign indicates decreasing VZ with rising temp |
| Power Dissipation | 500 mW at 25 °C - sets absolute thermal limit before derating begins |
| Forward Voltage | ≤1.5 V at 200 mA - defines conduction loss if accidentally forward-biased |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential during Zener operation; defines reference polarity and breakdown direction |
| Anode (non-banded end) | Reference ground/reference return | Common return path for bias current; must be held at lower potential than cathode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and solderability compatibility across legacy designs and automated assembly |
| −0.070 %/°C temperature coefficient | Enables predictable voltage drift compensation in temperature-sensitive analog references |
| 250 °C/W junction-to-lead thermal resistance | Supports reliable heat transfer through leads when mounted with ≥10 mm lead length from body |
| RoHS-compliant "e3" suffix option | Provides drop-in compliance path without requalification for lead-free manufacturing |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions or on-board ESD protection in low-risk environments |
Applications
| Low-Voltage Power Supply Reference | Sensor Biasing Circuit |
|---|---|
Use Scenario: Providing stable 3.3 V reference for linear regulators or op-amp feedback networks in industrial control modules. IC Role / Device Role / Timing Role: Voltage reference element defining output setpoint accuracy and thermal stability. Use Value: Delivers ±10% initial tolerance and −0.070 %/°C drift, enabling sub-1% total error over −40 to +85 °C with minimal external compensation. |
Use Scenario: Biasing resistive temperature detectors (RTDs) or bridge sensors in precision measurement front-ends. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage source establishing excitation potential. Use Value: Minimal 28 Ω dynamic impedance ensures stable bias current despite sensor impedance variations, reducing measurement nonlinearity. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Clamping transient surges on 3.3 V I/O lines in embedded communication interfaces (e.g., UART, SPI). IC Role / Device Role / Timing Role: Shunt protection device limiting voltage excursion above 3.63 V (max VZ + tolerance). Use Value: 500 mW power rating supports short-duration transients up to 150 ms at full rating, per derating curve in Figure 1. |
Use Scenario: Generating clean reset signal for 3.3 V microcontrollers during power-up and brown-out events. IC Role / Device Role / Timing Role: Threshold-detection element triggering reset logic via comparator or dedicated reset IC input. Use Value: Tight 3.3 V nominal voltage aligns with common MCU reset thresholds, while −0.070 %/°C drift maintains margin across operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5226B | ±5% tolerance (vs. ±10% for 1N5226A); same VZ, IZT, ZZT, and package | Higher initial accuracy required for tighter reference stability; reduced calibration effort | Select 1N5226B when system-level voltage tolerance budget demands <±5% at 25 °C |
| MMBZ5226BS | SOT-23 surface-mount package; same 3.3 V nominal, ±10% tolerance, but 22 Ω ZZT and 200 mW Pd | Space-constrained PCB layouts requiring SMT assembly; lower power handling limits surge capability | Choose MMBZ5226BS only when board area is critical and peak dissipation remains ≤200 mW |
Compared with 1N5226B and MMBZ5226BS, the 1N5226A offers optimal balance of axial-lead manufacturability, 500 mW surge capacity, and cost-effective ±10% tolerance-making it preferred for through-hole power supply references and industrial clamp circuits where layout flexibility and thermal robustness are prioritized over ultra-tight initial accuracy or miniaturization.
Availability
1N5226A is available at Aetrix Electronics and suitable for low-power voltage regulation, sensor biasing, and overvoltage protection requiring stable component supply across industrial control, instrumentation, and embedded power management designs.
Supply support for 1N5226A 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 timing components for aerospace, defense, and industrial markets.
The 1N5221–1N5281B series was designed to deliver JEDEC-standardized, glass-encapsulated Zener references with extended temperature range (−65 to +175 °C), radiation hardness, and military screening options for mission-critical analog subsystems.
FAQ
What is the nominal Zener voltage and test current for the 1N5226A?
The 1N5226A has a nominal Zener voltage of 3.3 V measured at a test current (IZT) of 20 mA. This value is guaranteed per JEDEC specification and forms the basis for its use as a stable voltage reference in low-power analog circuits. The 1N5226A's regulation performance-including impedance and temperature coefficient-is characterized specifically at this operating point.
Does the 1N5226A have a specified Zener impedance, and what does it mean for circuit design?
Yes, the 1N5226A has a maximum Zener impedance (ZZT) of 28 Ω at IZT = 20 mA. This parameter reflects how much the Zener voltage changes with small variations in current-lower impedance means better regulation under dynamic load conditions. In practice, this allows the 1N5226A to maintain tighter voltage stability in applications like sensor biasing or reference generation where current draw may fluctuate.
What is the temperature coefficient of the 1N5226A, and how does it affect long-term accuracy?
The 1N5226A has a temperature coefficient (αVZ) of −0.070 %/°C, meaning its Zener voltage decreases by approximately 2.31 mV per °C rise in junction temperature. This predictable drift enables designers to compensate for thermal effects in precision references-especially important in industrial environments where ambient temperatures vary widely. The 1N5226A's coefficient is confirmed for operation between 25 °C and 125 °C.
Can the 1N5226A be used in RoHS-compliant assemblies?
Yes, the 1N5226A is available in RoHS-compliant form with the "e3" suffix (e.g., 1N5226Ae3), featuring annealed matte-tin plating that meets J-STD-609 and EU RoHS Directive requirements. This version retains identical electrical and thermal specifications as the standard tin-lead variant, allowing seamless transition in lead-free manufacturing without redesign or requalification.
How does the 1N5226A's power derating behave above 25 °C?
The 1N5226A derates linearly from 500 mW at 25 °C, reaching zero power at 175 °C junction temperature. On a standard FR4 PCB (1 oz Cu, 4 mm² pads), its thermal resistance is 310 °C/W, so power must be reduced by 1.61 mW/°C above 25 °C ambient. For example, at 75 °C ambient, maximum allowable dissipation is ~420 mW-critical for reliability in enclosed or high-temperature enclosures.
1N5226A 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):
- 3.3 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 950 mV
- 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)
1N5226A FAQ
1.How can I place an order for 1N5226A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5226A 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 1N5226A reliable?
The price and inventory of 1N5226A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5226A is usually 5 days.
3.What payment methods are accepted for 1N5226A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5226A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5226A?
1N5226A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5226A 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 1N5226A?
For technical support, including 1N5226A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5226A requirements.
6.How does Aetrix verify that 1N5226A is sourced from the original manufacturer or authorized distributors?
All 1N5226A 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 1N5226A meets industry standards.
7.What is the process for return or replacement of 1N5226A?
All 1N5226A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5226A, 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 1N5226A part is unused and in its original packaging.
Return procedure for 1N5226A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5226A 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…
