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Microchip Technology 1N961B
- Part No.:
- 1N961B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N961B.pdf
- Description:
- DIODE ZENER 10V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:20
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Product details
Overview
1N961B from Microsemi is a silicon 500 mW axial-leaded Zener diode in DO-35 (DO-204AH) package, rated for 10 V nominal Zener voltage at 12.5 mA test current, with ±5% tolerance (B suffix), 700 Ω dynamic impedance at IZT, and +0.075 %/°C temperature coefficient. It regulates voltage in low-power reference and protection circuits across industrial and aerospace systems.
For engineers reviewing the 1N961B datasheet, 1N961B pinout, 1N961B application, or 1N961B equivalent, key selection factors include its 10 V regulation point, 0.5 W steady-state power rating at 50 °C lead temperature, DO-35 mechanical compatibility, and JEDEC-registered performance under MIL-STD-750 testing conditions.
Technical Context
The 1N961B operates as a reverse-biased voltage reference device with a sharp breakdown knee verified per MicroNote 202, using 12.5 mA DC test current and 1.25 mA AC superimposed signal for impedance measurement. Its Zener impedance of 700 Ω at IZT and 0.25 mA Zener knee impedance at 0.25 mA ensure stable regulation across varying load currents.
Thermal design relies on junction-to-lead thermal resistance of 250 °C/W (3/8″ lead length) and junction-to-ambient resistance of 310 °C/W on FR4 board with defined copper pad geometry. Forward voltage is ≤1.1 V at 200 mA, confirming standard silicon P-N junction behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 10 V ±5% - defines precise regulation threshold for biasing and clamping circuits |
| Zener Test Current | 12.5 mA - standardized operating point for VZ measurement and impedance characterization |
| Zener Impedance | 700 Ω at IZT - indicates voltage stability under small-signal AC variation around regulation point |
| Max DC Zener Current | 38 mA - maximum continuous reverse current before exceeding 400 mW dissipation at 75 °C lead temp |
| Temp Coefficient | +0.075 %/°C - positive drift rate enabling predictable compensation in temperature-stable references |
| Reverse Leakage | 10 μA at 7.6 V - ensures minimal quiescent current in high-impedance sensing nodes |
| Power Rating | 500 mW at TL < 50 °C - derates linearly above 50 °C per Figure 1, requiring thermal layout planning |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed axial-leaded glass body, cathode indicated by band; terminals are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded end | Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures cross-manufacturer interchangeability and standardized test methodology compliance |
| Internal metallurgical bond option (-1 suffix) | Enables enhanced reliability for military/aerospace applications without changing footprint |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Hermetic glass DO-35 package | Provides long-term stability and moisture resistance in harsh environmental deployments |
| Minimal capacitance | Typical CJ < 2 pF (per Figure 3) - preserves high-frequency signal integrity in RF bias networks |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 10 V reference for op-amp biasing and ADC voltage scaling in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing fixed reference potential independent of supply ripple. Use Value: Delivers ±5% initial accuracy and +0.075 %/°C drift, enabling <±1% total error over –40 to +85 °C ambient range. |
Use Scenario: Clamp circuit limiting microcontroller I/O voltage to 10 V during transient surges in automotive body control units. IC Role / Device Role / Timing Role: Reverse-biased shunt protector absorbing energy from ESD or load-dump events. Use Value: Withstands 200 mA surge current (1/120 s pulse) and maintains regulation up to 38 mA DC, preventing downstream IC damage. |
| Temperature-Stable Biasing | Low-Power Sensor Excitation |
Use Scenario: Biasing thermistor bridge amplifiers in aerospace environmental monitoring systems where long-term drift must be minimized. IC Role / Device Role / Timing Role: Zener-regulated current source establishing constant excitation for resistive sensors. Use Value: Positive temperature coefficient enables predictable compensation when paired with negative-coefficient sensors, reducing net system drift. |
Use Scenario: Providing stable 10 V excitation for piezoresistive pressure sensors in medical infusion pumps. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage source ensuring accurate sensor output linearity. Use Value: Sub-2 pF junction capacitance avoids signal coupling errors; 10 μA leakage prevents loading of high-impedance sensor bridges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A (ON Semiconductor) | 10 V ±5%, 1 W rating, DO-41 package, 17 Ω ZZT at 25 mA | Higher power and lower impedance suit higher-current references; larger DO-41 footprint requires PCB redesign | Select when >500 mW dissipation or <20 Ω impedance is required; not drop-in due to package and thermal profile differences |
| BZX55C10 (Vishay) | 10 V ±5%, 500 mW, DO-35, 20 Ω ZZT at 5 mA, –0.05 %/°C tempco | Lower impedance and negative tempco enable tighter regulation in compensated designs but require different thermal modeling | Prefer for cost-sensitive commercial designs needing lower dynamic impedance; verify tempco impact on system-level drift budget |
Compared with 1N961B, the 1N4740A offers higher power and lower impedance but demands layout changes, while the BZX55C10 provides tighter regulation at lower test current and opposite temperature drift-requiring revalidation of thermal compensation schemes.
Availability
1N961B is available at Aetrix Electronics and suitable for industrial power supply references, aerospace overvoltage clamps, and medical sensor excitation circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N961B 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 and mixed-signal components for defense, aerospace, and industrial markets.
The 1N957B–1N992B series was engineered for ruggedized voltage regulation in mission-critical systems, emphasizing JEDEC registration, MIL-STD-750 qualification, and hermetic DO-35 packaging for extended operational life.
FAQ
What is the Zener voltage tolerance for 1N961B?
The 1N961B has a nominal Zener voltage of 10 V with a ±5% tolerance, indicated by the "B" suffix per JEDEC registration. This means the actual measured VZ at 12.5 mA test current falls between 9.5 V and 10.5 V at 25 °C, verified per Note 1 in the Microsemi datasheet.
Can 1N961B be used in surface-mount designs?
No, the 1N961B is packaged in the through-hole DO-35 (DO-204AH) axial-leaded glass case. For surface-mount equivalents, Microsemi offers the MLL961B in DO-213AA (MELF) package; the 1N961B itself requires axial-leaded PCB mounting and cannot be reflowed or placed via SMT pick-and-place.
What is the maximum surge current rating for 1N961B?
The 1N961B supports a maximum surge current (IZSM) of 200 mA for a 1/120 second duration, as specified in the Electrical Characteristics table. This rating applies to square-wave or half-sine wave pulses and is validated per Note 5 in the Microsemi datasheet.
Is 1N961B RoHS compliant?
The base 1N961B is not RoHS compliant; however, the RoHS-compliant version is designated as 1N961Be3, with "e3" suffix indicating annealed matte-tin plating per JEDEC J-STD-609. Always verify the full part number marking on the device body or reel label.
How does temperature affect the Zener voltage of 1N961B?
The 1N961B exhibits a positive temperature coefficient of +0.075 %/°C, meaning its Zener voltage increases by approximately 7.5 mV per °C rise in junction temperature. This behavior is documented in the Electrical Characteristics table and Figure 2, and must be accounted for in precision reference designs.
1N961B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N961B FAQ
1.How can I place an order for 1N961B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N961B 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 1N961B reliable?
The price and inventory of 1N961B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N961B is usually 5 days.
3.What payment methods are accepted for 1N961B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N961B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N961B?
1N961B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N961B 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 1N961B?
For technical support, including 1N961B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N961B requirements.
6.How does Aetrix verify that 1N961B is sourced from the original manufacturer or authorized distributors?
All 1N961B 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 1N961B meets industry standards.
7.What is the process for return or replacement of 1N961B?
All 1N961B units undergo pre-shipment inspection (PSI). If there is an issue with 1N961B, 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 1N961B part is unused and in its original packaging.
Return procedure for 1N961B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N961B 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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