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Microchip Technology 1N5270B
- Part No.:
- 1N5270B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5270B.pdf
- Description:
- DIODE ZENER 91V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,872
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Product details
Overview
1N5270B from Microsemi is a 500 mW, 91 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers stable Zener voltage at 20 mA test current with 2300 Ω dynamic impedance and +0.099 %/°C temperature coefficient.
For engineers reviewing the 1N5270B datasheet, 1N5270B pinout, 1N5270B application, or 1N5270B equivalent, this page provides verified electrical parameters, thermal derating behavior, DO-35 mechanical dimensions, JEDEC-compliant screening options, and direct alternatives for voltage reference design.
Technical Context
The 1N5270B operates as a two-terminal reverse-biased voltage reference with sharp breakdown knee confirmed by dual-point Zener impedance measurement per MicroNote 202. Its regulation is specified at IZT = 20 mA and validated across -65°C to +175°C operating range.
Thermal performance is defined by junction-to-lead resistance of 250 °C/W at 3/8" lead length and junction-to-ambient resistance of 310 °C/W on FR4 with 4 mm² copper pads. Forward voltage is capped at 1.5 V @ 200 mA, and ESD immunity is certified per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 91 V ±5% at 20 mA - defines regulated output level for reference and clamp circuits |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance | 2300 Ω @ IZK = 0.25 mA - indicates voltage stability under light-load transients |
| Temp. Coefficient | +0.099 %/°C - quantifies drift magnitude over industrial temperature range |
| Reverse Current | 0.1 μA @ VR = 73 V - ensures minimal leakage in high-impedance bias networks |
| Operating Temp. | -65°C to +175°C - supports aerospace, downhole, and extended-temperature industrial use |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; held at precise 91 V above anode when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees full six-parameter specification compliance including VZ, IR, ZZT, ZZK, VF, and αVZ |
| ±5% tolerance (B suffix) | Enables tighter reference accuracy than standard ±10% (A) or ±20% (no suffix) variants |
| Low capacitance (typ. <2 pF) | Minimizes signal coupling and phase shift in RF bias and timing circuits |
| Radiation-hardened construction | Inherent hardness per MicroNote 050 supports space-grade and nuclear instrumentation applications |
| MIL-PRF-19500 screening options | JAN/JANTX/JANTXV/JANS versions available with MQ/MX/MV/MSP prefixes for defense/aerospace use |
Applications
| High-Voltage Reference Supply | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Generating stable 91 V reference for ADC front-end scaling or HV op-amp biasing in industrial data acquisition systems. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing fixed potential against which analog signals are measured. Use Value: Delivers ±5% tolerance and +0.099 %/°C drift control to maintain measurement accuracy across temperature cycling. |
Use Scenario: Protecting downstream 100 V-rated power management ICs from transient surges in DC bus monitoring circuits. IC Role / Device Role / Timing Role: Shunt clamping element that conducts excess energy above 91 V to ground. Use Value: Limits peak voltage to 91 V with 2300 Ω dynamic impedance, preventing latch-up or gate oxide damage. |
| Temperature-Stable Bias Network | Aerospace Power Sequencing |
Use Scenario: Establishing bias points for discrete transistor amplifiers operating across -55°C to +125°C in avionics subsystems. IC Role / Device Role / Timing Role: Precision Zener element setting collector/drain bias voltages independent of supply variation. Use Value: Maintains regulation within ±0.9 V over full temperature range due to characterized +0.099 %/°C coefficient. |
Use Scenario: Enabling controlled power-up sequencing in satellite payload power distribution units requiring radiation-tolerant components. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference used in reset threshold detection and brown-out monitoring. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for additional shielding or derating in LEO missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5270A | ±10% tolerance, same 91 V nominal, identical DO-35 package and thermal specs | Lower accuracy requirement; acceptable where ±10% regulation suffices | Select 1N5270A for cost-sensitive designs where tighter tolerance is not required |
| MMBZ5270B | Surface-mount SOT-23 package, same 91 V ±5%, 225 mW rating, higher thermal resistance | PCB space-constrained designs requiring automated assembly instead of axial through-hole mounting | Choose MMBZ5270B only when board layout mandates SMT and power dissipation remains ≤225 mW |
Compared with 1N5270B, the 1N5270A trades ±5% accuracy for lower cost in non-critical references, while the MMBZ5270B enables SMT placement but requires thermal derating due to its 225 mW limit and higher junction-to-ambient resistance.
Availability
1N5270B is available at Aetrix Electronics and suitable for high-voltage reference supplies, overvoltage clamp protection, and temperature-stable bias networks requiring stable component supply and long-term obsolescence management.
Supply support for 1N5270B 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-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxB series was engineered to deliver JEDEC-guaranteed six-parameter Zener performance in ruggedized DO-35 packaging for mission-critical voltage reference and protection functions.
FAQ
What is the Zener voltage tolerance for 1N5270B?
The 1N5270B has a nominal Zener voltage of 91 V with a guaranteed tolerance of ±5%, as confirmed by JEDEC registration and full six-parameter specification testing. This tolerance applies under standard test conditions of 20 mA Zener test current at 25°C ambient temperature, and is maintained across the device's full operating temperature range per Microsemi's published characterization data.
What is the maximum power dissipation for 1N5270B at 75°C ambient?
At 75°C ambient temperature, the 1N5270B must be derated from its 500 mW rating at 25°C. Using the published thermal resistance of 310 °C/W on FR4 with 4 mm² copper pads, the allowable power drops to approximately 345 mW. This value aligns with the linear derating curve shown in Figure 1 of the Microsemi datasheet, where power decreases by 3.33 mW/°C above 25°C.
Is 1N5270B suitable for surface-mount assembly?
No, the 1N5270B is packaged in the axial-leaded DO-35 (DO-204AH) glass case and is intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the MMBZ5270B in SOT-23, which shares the same 91 V ±5% rating but is rated for 225 mW and requires different PCB layout and thermal management.
Does 1N5270B have radiation-hardened characteristics?
Yes, the 1N5270B exhibits inherent radiation hardness per MicroNote 050, a documented characteristic of Microsemi's DO-35 Zener process. This makes it suitable for low-dose-rate environments in aerospace and nuclear instrumentation without requiring additional qualification testing beyond standard MIL-PRF-19500 screening levels.
What is the forward voltage specification for 1N5270B?
The forward voltage for 1N5270B is specified as a maximum of 1.5 V at 200 mA forward current, per the "Maximum Ratings" table in the Microsemi datasheet. This parameter is relevant for polarity verification during functional testing and for applications where the device may experience brief forward conduction during power-up or fault conditions.
1N5270B 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):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 400 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 69 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)
1N5270B FAQ
1.How can I place an order for 1N5270B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5270B 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 1N5270B reliable?
The price and inventory of 1N5270B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5270B is usually 5 days.
3.What payment methods are accepted for 1N5270B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5270B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5270B?
1N5270B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5270B 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 1N5270B?
For technical support, including 1N5270B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5270B requirements.
6.How does Aetrix verify that 1N5270B is sourced from the original manufacturer or authorized distributors?
All 1N5270B 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 1N5270B meets industry standards.
7.What is the process for return or replacement of 1N5270B?
All 1N5270B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5270B, 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 1N5270B part is unused and in its original packaging.
Return procedure for 1N5270B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5270B Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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