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Microchip Technology 1N5270B/TR
- Part No.:
- 1N5270B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5270B/TR.pdf
- Description:
- DIODE ZENER 91V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,311
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Product details
Overview
1N5270B/TR from Microsemi is a 500 mW, 91 V, ±5% tolerance 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 operates across –65°C to +175°C.
For engineers reviewing the 1N5270B/TR datasheet, 1N5270B/TR pinout, 1N5270B/TR application, or 1N5270B/TR equivalent, this page provides verified electrical parameters, thermal derating behavior, Zener temperature coefficient (+0.099 %/°C), RoHS-compliant plating options, and tape-and-reel packaging details per EIA-296.
Technical Context
The 1N5270B/TR operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its Zener voltage is specified at IZT = 20 mA with guaranteed limits on VZ, IR, ZZT, ZZK, VF, and αVZ - distinguishing it from JEDEC-only variants.
It exhibits a positive temperature coefficient of +0.099 %/°C (measured from 25°C to 125°C at rated IZT), minimal capacitance (<1.5 pF typical per Figure 2), and is nonsensitive to ESD per MIL-STD-750 Method 1020. Thermal resistance is 250 °C/W junction-to-lead at 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 91 V ±5% at 20 mA - defines regulated output level with tight tolerance for reference stability |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance | 2300 Ω at IZK = 0.25 mA - indicates voltage regulation stiffness under light-load conditions |
| Reverse Current | ≤0.1 μA at VR = 73 V - ensures low leakage in high-impedance bias networks |
| Temp. Coefficient | +0.099 %/°C - quantifies voltage drift magnitude over operating temperature range |
| Forward Voltage | ≤1.5 V at 200 mA - defines conduction threshold when used in forward-biased protection paths |
| Operating Temp. | –65°C to +175°C - supports deployment in aerospace, downhole, and industrial environments |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by band; banded end must be held positive relative to anode for Zener operation. Weight: 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Connected to higher potential node; reverse-biased to maintain fixed voltage drop |
| Anode (unbanded end) | Reference return terminal | Connected to circuit ground or lower-potential rail; completes Zener current path |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter regulation than standard ±10% (A) or JEDEC-only parts, reducing calibration overhead |
| RoHS-compliant matte-tin plating | Supports lead-free reflow soldering per MIL-STD-750 Method 2026 without compromising solderability |
| Tape-and-reel packaging (TR suffix) | Enables automated pick-and-place assembly per EIA-296, improving manufacturing throughput |
| Radiation-hardened construction | Inherently radiation tolerant per MicroNote 050 - suitable for space-qualified or high-reliability systems |
| Nonsensitive to ESD | Withstands human-body-model ESD events without parameter shift, eliminating need for external protection |
Applications
| Voltage Reference Supply | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Providing stable 91 V reference for ADC biasing or comparator thresholds in industrial sensor signal chains. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC offset independent of load current variation. Use Value: Delivers ±5% initial accuracy and +0.099 %/°C drift control, enabling <±1.5% total error over –40°C to +85°C without trimming. | Use Scenario: Protecting downstream 100 V-rated op-amps or ADC inputs from transient surges in motor drive feedback loops. IC Role / Device Role / Timing Role: Shunt clamping element that conducts excess energy above 91 V to ground during overvoltage events. Use Value: Limits peak voltage to ≤91 V + IZ × ZZT, with 2300 Ω dynamic impedance ensuring predictable clamping margin under fast transients. |
| Low-Power Bias Network | Temperature-Stable Calibration Source |
Use Scenario: Generating fixed bias points for JFET amplifiers or vacuum tube heater supplies where low quiescent current is critical. IC Role / Device Role / Timing Role: Passive current-sinking regulator maintaining constant voltage across high-impedance nodes. Use Value: Draws only 20 mA nominal, with ≤0.1 μA leakage below 73 V, minimizing standby power in battery-powered instrumentation. | Use Scenario: Serving as traceable calibration reference in portable multimeters requiring long-term stability and known tempco. IC Role / Device Role / Timing Role: Primary voltage standard whose drift is characterized and compensated in firmware. Use Value: +0.099 %/°C tempco allows accurate software compensation; hermetic DO-35 package ensures parameter retention over 10+ years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5270C/TR | ±2% tolerance (C suffix) vs. ±5% (B); same VZ, IZT, package, and tempco | Higher initial accuracy required for metrology-grade references or untrimmed designs | Select when tighter voltage tolerance justifies cost premium and no additional tempco compensation is needed |
| MMBZ5270B-7-F | Surface-mount SOD-123 package; 500 mW rating; ±5% tolerance; 91 V nominal; RoHS-compliant | Required for PCB space-constrained or reflow-only assembly processes | Select when board area or automated assembly mandates SMT over through-hole; verify thermal pad layout for 250 °C/W dissipation |
Compared with 1N5270B/TR, the 1N5270C/TR improves initial accuracy but retains identical thermal and dynamic impedance behavior, while MMBZ5270B-7-F enables SMT integration at the cost of reduced mechanical robustness and different thermal path characteristics.
Availability
1N5270B/TR is available at Aetrix Electronics and suitable for voltage reference supplies, overvoltage clamp circuits, and low-power bias networks requiring stable component supply across aerospace, industrial instrumentation, and test equipment programs.
Supply support for 1N5270B/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 precision analog components for aerospace, defense, and industrial markets.
The 1N52xxB series belongs to Microsemi's legacy DO-35 Zener diode product line, engineered for stable voltage regulation in harsh environments where wide temperature operation, ESD immunity, and long-term parametric stability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5270B/TR?
The 1N5270B/TR has a nominal Zener voltage of 91 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per Microsemi's datasheet. This tolerance applies under standard test conditions (IZT = 20 mA, TA = 25°C) and covers all units in the production lot, distinguishing it from JEDEC-only variants with looser limits.
Does 1N5270B/TR support lead-free soldering?
Yes, the 1N5270B/TR is offered in RoHS-compliant versions with annealed matte-tin plating, qualified for lead-free reflow soldering at 260°C for 10 seconds per MIL-STD-750 Method 2026. The "e3" suffix denotes RoHS compliance, and the TR suffix confirms tape-and-reel packaging compatible with automated assembly.
What is the maximum reverse leakage current for 1N5270B/TR?
The maximum reverse leakage current for 1N5270B/TR is 0.1 μA at VR = 73 V (80% of nominal VZ), as specified in the Electrical Characteristics table. This low leakage supports use in high-impedance bias networks and precision reference circuits where current draw must remain negligible.
How does temperature affect the Zener voltage of 1N5270B/TR?
The 1N5270B/TR has a positive temperature coefficient of +0.099 %/°C, measured from 25°C to 125°C at rated test current. This means its Zener voltage increases by approximately 0.09 V per 10°C rise - a key factor when designing temperature-compensated references or predicting regulation drift in wide-temperature applications.
Is 1N5270B/TR suitable for overvoltage protection in 100 V systems?
Yes, the 1N5270B/TR is commonly used as a shunt overvoltage clamp for 100 V-rated systems. With a nominal 91 V Zener voltage and ±5% tolerance, its worst-case clamping occurs at 95.55 V, providing a safe margin below the 100 V rating while limiting transient energy via its 2300 Ω dynamic impedance at low currents.
1N5270B/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):
- 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/TR FAQ
1.How can I place an order for 1N5270B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5270B/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 1N5270B/TR reliable?
The price and inventory of 1N5270B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5270B/TR is usually 5 days.
3.What payment methods are accepted for 1N5270B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5270B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5270B/TR?
1N5270B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5270B/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 1N5270B/TR?
For technical support, including 1N5270B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5270B/TR requirements.
6.How does Aetrix verify that 1N5270B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5270B/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 1N5270B/TR meets industry standards.
7.What is the process for return or replacement of 1N5270B/TR?
All 1N5270B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5270B/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 1N5270B/TR part is unused and in its original packaging.
Return procedure for 1N5270B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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