My Inquiry
My Account
Microchip Technology 1N5226B/TR
- Part No.:
- 1N5226B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5226B/TR.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,506
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5226B/TR from Microsemi is a 3.3 V, ±5% 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 IZK, used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5226B/TR datasheet, 1N5226B/TR pinout, 1N5226B/TR application, or 1N5226B/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 (−0.070 %/°C), and MIL-STD-750 qualified ESD immunity.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 3.3 V reference across a broad current range (0.25–20 mA), with low dynamic impedance ensuring minimal voltage deviation under load transients. Its glass DO-35 package provides hermetic sealing and inherent radiation hardness per MicroNote 050.
It exhibits a negative temperature coefficient of −0.070 %/°C, indicating decreasing Zener voltage with rising temperature - critical for biasing stability in temperature-varying environments. Maximum reverse leakage is 100 μA at 2.5 V, and forward voltage is ≤1.5 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V @ 20 mA - precise regulation point for 3.3 V rail referencing and clamping |
| Zener Tolerance | ±5% (B suffix) - ensures predictable voltage window (3.14–3.47 V) without binning |
| Power Dissipation | 500 mW at 25 °C - supports continuous operation in compact through-hole designs with 3/8″ lead length |
| Zener Impedance | 28 Ω @ IZK = 0.25 mA - low dynamic resistance improves regulation accuracy under light-load conditions |
| Temp. Coefficient | −0.070 %/°C - quantifies voltage drift for thermal compensation design in industrial ambient ranges |
| Max Reverse Leakage | 100 μA @ 2.5 V - defines minimum operating current threshold before regulation onset |
| Package | DO-35 (DO-204AH) glass axial-leaded - enables manual soldering, high-reliability hermetic sealing, and FR4 board mounting |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single black band; operated with banded end positive relative to anode for Zener regulation. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased configuration requires this terminal at lower potential than cathode |
| Cathode | Zener regulation output | Banded end; supplies regulated 3.3 V when reverse-biased; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N5226B | Guarantees full six-parameter compliance (VZ, IR, ZZT, ZZK, αVZ, VF) - eliminates need for incoming inspection screening |
| Hermetic glass DO-35 body | Enables operation from −65 °C to +175 °C with no moisture ingress risk - suitable for aerospace and downhole applications |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - allows handling without grounding straps in standard assembly lines |
| RoHS-compliant option | e3 suffix available - meets EU Directive 2011/65/EU without performance trade-offs or derating |
| Tape-and-reel packaging | TR suffix denotes EIA-296 standard - enables automated pick-and-place for mixed-technology PCB assembly |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules operating across −40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Zener diode providing fixed 3.3 V reference to op-amp bias network and ADC reference divider. Use Value: Maintains <±0.5% reference stability over temperature due to known −0.070 %/°C coefficient and low 28 Ω impedance, reducing calibration drift. | Use Scenario: Supplying clean, low-noise 3.3 V reference to internal ADC and brown-out detection circuitry in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Discrete Zener regulating LDO output or bypassing internal bandgap to improve PSRR at low current (<1 mA). Use Value: Delivers 3.3 V reference with only 100 μA max reverse leakage at 2.5 V, minimizing quiescent current impact on 10-year battery life. |
| Overvoltage Clamp in RS-232 Interface | Legacy Power Supply Feedback Divider |
Use Scenario: Protecting UART transceiver inputs against ESD-induced transients up to ±15 kV contact discharge in industrial HMI panels. IC Role / Device Role / Timing Role: Fast-reacting shunt clamp placed between TX/RX lines and ground, absorbing surge energy via controlled Zener breakdown. Use Value: Glass DO-35 construction withstands repeated 500 mW surges without parameter shift; 1.5 V max forward voltage ensures fast turn-on during positive transients. | Use Scenario: Setting feedback voltage in isolated flyback converters using TL431-based optocoupler circuits where cost-sensitive BOMs avoid integrated references. IC Role / Device Role / Timing Role: Precision Zener replacing TL431 in low-current (<5 mA) auxiliary bias windings to reduce component count. Use Value: Matches TL431's 2.5 V reference headroom requirement with 3.3 V output and ±5% tolerance, enabling direct resistor-divider scaling 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 |
|---|---|---|---|
| 1N4728A/TR | 3.3 V, ±5%, 1 W power rating, DO-41 package - higher power but larger footprint and 30 Ω Zz | Preferred in higher-current regulation (>40 mA) or where thermal margin >500 mW is required | Select 1N4728A/TR only if board layout accommodates DO-41 and dissipation exceeds 500 mW average |
| MMBZ5226BS-7-F | 3.3 V, ±5%, SOD-123 surface-mount package, 200 mW - smaller size but derated to 150 mW at TA=70°C | Suitable for space-constrained consumer PCBs where reflow compatibility and density outweigh axial-lead serviceability | Choose MMBZ5226BS-7-F when automated assembly and miniaturization are prioritized over field-replaceability and high-temp reliability |
Compared with 1N4728A/TR and MMBZ5226BS-7-F, the 1N5226B/TR uniquely balances JEDEC-registered parametric assurance, DO-35 hermetic reliability, and exact 500 mW/3.3 V specification - making it optimal for industrial control and legacy replacement where axial mounting and MIL-qualified ESD immunity are mandatory.
Availability
1N5226B/TR is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference, RS-232 overvoltage protection, and legacy power supply feedback divider applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N5226B/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 1N5226B/TR belongs to Microsemi's legacy 1N52xxB Zener series - engineered for precision voltage regulation in harsh-environment systems where hermetic sealing, wide temperature operation, and JEDEC compliance are non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N5226B/TR?
The 1N5226B/TR has a nominal Zener voltage of 3.3 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This means the actual measured VZ at 20 mA test current falls within 3.14 V to 3.47 V across all units, confirmed by full six-parameter testing - not just VZ and IR.
Does the 1N5226B/TR require heatsinking in standard PCB mounting?
No, the 1N5226B/TR does not require external heatsinking when mounted on FR4 with 4 mm² copper pads and 1 mm track width, as its thermal resistance is 310 °C/W junction-to-ambient. At 500 mW dissipation and 25 °C ambient, junction temperature rise is ~155 °C - well within its −65 °C to +175 °C operating limit when lead length is ≥3/8″ (10 mm).
Is the 1N5226B/TR RoHS compliant?
Yes, the 1N5226B/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5226B-e3/TR). The base part number without "e3" uses traditional tin-lead plating; however, both versions meet MIL-STD-750 solderability requirements and share identical electrical specifications and DO-35 mechanical form.
What is the maximum reverse leakage current for the 1N5226B/TR?
The maximum reverse leakage current for the 1N5226B/TR is 100 μA at VR = 2.5 V, measured after 20 seconds of thermal stabilization. This value is guaranteed for all units and reflects the device's ability to remain effectively "off" below its 3.3 V regulation threshold - critical for low-power standby modes.
Can the 1N5226B/TR be used as a substitute for the 1N4728A in existing designs?
The 1N5226B/TR is not a direct drop-in substitute for the 1N4728A due to differing packages (DO-35 vs. DO-41) and thermal characteristics (250 °C/W vs. ~200 °C/W junction-to-lead). While both regulate at 3.3 V ±5%, the 1N5226B/TR's lower power rating (500 mW vs. 1 W) and smaller glass body require layout review - especially for sustained >300 mW loads.
1N5226B/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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 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)
1N5226B/TR FAQ
1.How can I place an order for 1N5226B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5226B/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 1N5226B/TR reliable?
The price and inventory of 1N5226B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5226B/TR is usually 5 days.
3.What payment methods are accepted for 1N5226B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5226B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5226B/TR?
1N5226B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5226B/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 1N5226B/TR?
For technical support, including 1N5226B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5226B/TR requirements.
6.How does Aetrix verify that 1N5226B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5226B/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 1N5226B/TR meets industry standards.
7.What is the process for return or replacement of 1N5226B/TR?
All 1N5226B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5226B/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 1N5226B/TR part is unused and in its original packaging.
Return procedure for 1N5226B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5226B/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…
