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Microchip Technology 1N5225B
- Part No.:
- 1N5225B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5225B.pdf
- Description:
- DIODE ZENER 3V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,182
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Product details
Overview
1N5225B from Microsemi is a 3.0 V, ±5% 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 knee current, used for precision voltage reference and low-power regulation in analog sensor interfaces and power supply feedback loops.
For engineers reviewing the 1N5225B datasheet, 1N5225B pinout, 1N5225B application, or 1N5225B equivalent, this page delivers verified electrical specs, thermal derating behavior, temperature coefficient, packaging details, and direct alternatives for stable low-voltage Zener regulation in industrial and aerospace-grade designs.
Technical Context
The 1N5225B operates as a reverse-biased silicon Zener diode with a nominal breakdown voltage of 3.0 V at 20 mA, exhibiting a negative temperature coefficient of −0.075 %/°C over 25–125 °C. Its 1600 Ω Zener impedance at IZK = 0.25 mA confirms sharp knee characteristics critical for stable reference performance under light-load conditions.
Designed for axial-leaded through-hole mounting on FR4 PCBs, it delivers 0.48 W steady-state power at TA < 25 °C with 4 mm² copper pads and specified trace geometry, and supports soldering at 260 °C for 10 s. The cathode band identifies polarity, and operation requires the banded end to be positive relative to the anode for regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.0 V at 20 mA - defines precise regulation point for low-voltage biasing and reference circuits |
| Zener Tolerance | ±5% (B suffix) - ensures predictable voltage window without post-selection in production |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous power before thermal derating begins |
| Zener Impedance | 1600 Ω at IZK = 0.25 mA - indicates high dynamic resistance near knee, suitable for stable reference not high-current shunt |
| Temp. Coefficient | −0.075 %/°C - enables predictable drift compensation in temperature-critical analog stages |
| Max Reverse Current | 100 μA at VR = 1.0 V - defines leakage floor for low-power standby operation |
| Forward Voltage | ≤1.5 V at 200 mA - ensures robust forward conduction for protection or clamping use cases |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating; cathode identified by single black band; weight 0.2 g; mechanical dimensions per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse voltage applied across anode-to-cathode for Zener operation |
| Cathode (banded end) | Regulated output node | Provides stable 3.0 V when reverse-biased; must be held positive relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N5225B | Guarantees full six-parameter specification compliance (VZ, IR, ZZT, ZZK, αVZ, VF), unlike generic JEDEC 1N5225 |
| −0.075 %/°C tempco | Enables predictable voltage drift modeling across −65 to +175 °C operating range for aerospace and military designs |
| 100 μA max IR @ 1.0 V | Supports ultra-low-quiescent-current applications such as battery-backed sensor references |
| RoHS-compliant e3 option | Available with "1N5225Be3" suffix for lead-free assembly without requalification |
Applications
| Low-Voltage Sensor Biasing | Power Supply Feedback Reference |
|---|---|
Use Scenario: Providing stable 3.0 V bias to op-amp input stages in RTD or thermistor signal conditioners operating from 5 V rails. IC Role / Device Role / Timing Role: Precision voltage reference source establishing fixed DC offset for analog front-end amplification. Use Value: ±5% tolerance and −0.075 %/°C tempco ensure <±15 mV total drift over −40 to +85 °C, meeting Class A sensor accuracy requirements. | Use Scenario: Setting regulated output voltage in discrete 3.3 V linear regulator feedback networks using TL431 or discrete transistor shunt topologies. IC Role / Device Role / Timing Role: Zener reference element defining error amplifier setpoint in closed-loop voltage control. Use Value: 1600 Ω impedance at 0.25 mA ensures minimal loading error on high-impedance divider nodes while maintaining regulation stability. |
| Overvoltage Clamp Protection | Aerospace Power Sequencing |
Use Scenario: Clamping transient spikes on 3.3 V I/O lines in industrial PLC modules exposed to EFT or surge events. IC Role / Device Role / Timing Role: Low-energy crowbar device limiting voltage excursion above 3.0 V during fault conditions. Use Value: Glass DO-35 construction and 0.5 W rating allow repeatable clamping without parametric shift after multiple 100 ns transients up to 1 A peak. | Use Scenario: Generating sequenced enable thresholds for dual-rail FPGAs in satellite payload power systems requiring −65 to +125 °C operation. IC Role / Device Role / Timing Role: Temperature-stable voltage threshold detector triggering power-on reset logic via comparator input. Use Value: Radiation-hardened design and guaranteed −65 to +175 °C storage range support mission-critical reliability without derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, DO-41 package, 1.0 W rating, +0.030 %/°C tempco | Higher power and positive tempco - better for higher-current shunt regulation but less stable at low currents | Select when >500 mW dissipation or positive tempco tracking with other components is required |
| BZX55C3V0 | 3.0 V nominal, ±5%, DO-35 package, 500 mW, −0.07 %/°C tempco, tighter ZZK spec (≤50 Ω) | Lower Zener impedance at knee current - improved regulation stability under varying load | Select when sub-100 Ω dynamic impedance at low current is mandatory for high-precision references |
Compared with 1N4728A and BZX55C3V0, the 1N5225B offers the most consistent −0.075 %/°C tempco and JEDEC-registered six-parameter compliance in the 3.0 V class, making it preferred for temperature-critical, low-power reference designs where parametric predictability outweighs raw power handling.
Availability
1N5225B is available at Aetrix Electronics and suitable for low-power voltage reference, analog sensor biasing, and aerospace-grade power sequencing requiring stable component supply across extended temperature ranges and long-lifecycle programs.
Supply support for 1N5225B 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 1N52xxB series was designed specifically for precision, low-power Zener reference applications demanding guaranteed six-parameter specifications, wide temperature operation, and MIL-qualified screening options.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5225B?
The 1N5225B has a nominal Zener voltage of 3.0 V at 20 mA test current with a guaranteed tolerance of ±5%, confirmed by JEDEC registration and full six-parameter specification compliance. This tolerance applies across the full operating temperature range of −65 to +175 °C, and the 1N5225B part number explicitly denotes the B-suffix 5% grade - distinct from A-suffix (±10%) or unsuffixed (±20%) variants.
What is the Zener impedance of the 1N5225B and why does it matter?
The 1N5225B exhibits 1600 Ω dynamic impedance (ZZT) at IZK = 0.25 mA, measured per MicroNote 202 methodology. This value reflects the slope of the Zener breakdown curve near the knee and directly impacts regulation stability under light-load conditions - a critical factor in precision reference and low-current bias applications where impedance-induced voltage error must be minimized.
Can the 1N5225B be used in surface-mount designs?
No - the 1N5225B is exclusively a through-hole DO-35 (DO-204AH) axial-leaded device. For surface-mount equivalents, Microsemi offers the MLL5225B in DO-213AA (MELF) package, which shares identical electrical specifications including 3.0 V ±5%, −0.075 %/°C tempco, and 500 mW rating, but requires re-layout for SMT placement and reflow compatibility.
What is the temperature coefficient of the 1N5225B and how is it tested?
The 1N5225B has a temperature coefficient (αVZ) of −0.075 %/°C, measured between 25 °C and 125 °C at 7.5 mA test current per Note 3 in the datasheet. This negative coefficient means its Zener voltage decreases slightly with rising temperature - a key parameter for drift budgeting in high-accuracy analog circuits and compensated reference designs.
Is the 1N5225B suitable for aerospace applications with radiation exposure?
Yes - the 1N5225B is inherently radiation-hardened per MicroNote 050 and qualifies for MIL-PRF-19500 screening levels (JAN, JANTX, JANTXV, JANS) when ordered with appropriate prefixes and the "-1" suffix. Its glass DO-35 construction and silicon process provide proven total ionizing dose (TID) resilience, making it suitable for satellite power conditioning and avionics subsystems.
1N5225B 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 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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)
1N5225B FAQ
1.How can I place an order for 1N5225B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5225B 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 1N5225B reliable?
The price and inventory of 1N5225B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5225B is usually 5 days.
3.What payment methods are accepted for 1N5225B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5225B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5225B?
1N5225B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5225B 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 1N5225B?
For technical support, including 1N5225B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5225B requirements.
6.How does Aetrix verify that 1N5225B is sourced from the original manufacturer or authorized distributors?
All 1N5225B 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 1N5225B meets industry standards.
7.What is the process for return or replacement of 1N5225B?
All 1N5225B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5225B, 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 1N5225B part is unused and in its original packaging.
Return procedure for 1N5225B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5225B 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
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