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Microchip Technology 1N966B
- Part No.:
- 1N966B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N966B.pdf
- Description:
- DIODE ZENER 16V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:4,347
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Product details
Overview
1N966B from Microsemi is a silicon 500 mW axial-leaded Zener diode in DO-35 (DO-204AH) package, rated for 16 V nominal Zener voltage at 7.8 mA test current, with ±5% tolerance (B suffix), 700 Ω dynamic impedance at IZT, and +0.083 %/°C temperature coefficient. It regulates voltage in low-power reference and protection circuits across industrial and aerospace systems.
For engineers reviewing the 1N966B datasheet, 1N966B pinout, 1N966B application, or 1N966B equivalent, key selection criteria include its 16 V regulation point, 7.8 mA Zener test current, 700 Ω ZZT, -65°C to +175°C operating range, and DO-35 glass-body construction with cathode band polarity marking.
Technical Context
The 1N966B operates as a two-terminal voltage reference device, conducting in reverse breakdown to maintain stable 16 V across its terminals within specified current limits. Its Zener impedance of 700 Ω at 7.8 mA and 0.25 mA minimum knee current (IZK) define regulation linearity and low-current stability.
Designed for axial-leaded through-hole mounting, it features hermetically sealed glass DO-35 packaging with tin-lead or RoHS-compliant matte-tin plating, rated for 0.5 W steady-state dissipation at 50°C lead temperature and 0.48 W on FR4 board at 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16 V ±5% - precise DC reference level for biasing, clamping, or calibration circuits |
| Zener Test Current | 7.8 mA - operating point where VZ is specified and ZZT measured |
| Zener Impedance | 700 Ω at IZT - determines output voltage variation under load current changes |
| Max DC Zener Current | 24 mA - maximum continuous reverse current before exceeding 400 mW dissipation at 75°C lead temp |
| Temp Coefficient | +0.083 %/°C - positive drift rate enabling predictable voltage shift over temperature |
| Reverse Leakage | 5 μA at 12.2 V - ensures minimal parasitic current in high-impedance sensing nodes |
| Surge Current | 120 mA (1/120 sec pulse) - withstands transient overvoltage events without degradation |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed axial-leaded glass body, 0.2 g weight, cathode indicated by colored band. Terminals are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward voltage ≤1.3 V @200 mA |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation polarity |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Industry-standard 1N957B–1N992B family with documented reliability and interchangeability |
| Wide temperature range | -65°C to +175°C operation supports aerospace, downhole, and military environments |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for space-grade designs |
| ESD robustness | Nonsensitive to ESD per MIL-STD-750 Method 1020 - no special handling required |
| Low 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 16 V reference for linear regulator feedback or ADC reference divider networks. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing precision DC bias point. Use Value: Delivers ±5% initial accuracy and +0.083 %/°C drift, enabling repeatable analog measurement across thermal cycles. |
Use Scenario: Clamping transient spikes on 12–15 V logic rails or sensor inputs. IC Role / Device Role / Timing Role: Reverse-biased shunt element that conducts above 16 V to limit voltage excursion. Use Value: Withstands 120 mA surge pulses and maintains regulation down to 0.25 mA knee current for reliable fault response. |
| Temperature-Stable Biasing | Aerospace Voltage Monitoring |
Use Scenario: Biasing op-amp input stages or transistor bases in wide-temperature instrumentation. IC Role / Device Role / Timing Role: Passive component establishing fixed DC offset with known thermal drift behavior. Use Value: Predictable +0.083 %/°C coefficient allows accurate compensation modeling in analog front-ends. |
Use Scenario: Monitoring bus voltage in satellite power distribution units requiring radiation-hardened components. IC Role / Device Role / Timing Role: Radiation-tolerant Zener reference used in fault-detection comparators. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in LEO missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A (ON Semiconductor) | 14 V nominal, ±5%, DO-41 package, 1 W rating, 20 Ω ZZT at 25 mA | Higher power, lower impedance, but different voltage and larger footprint | Select when 14 V reference and higher surge capability are required; not drop-in due to voltage and package mismatch |
| BZX55C16 (Vishay) | 16 V nominal, ±5%, DO-35 package, 500 mW, 40 Ω ZZT at 5 mA | Same voltage and package, but lower ZZT and tighter thermal resistance spec | Prefer for improved regulation stiffness at lower currents; verify layout compatibility with Microsemi's lead-length thermal model |
Compared with 1N966B, the 1N4744A offers higher power and lower impedance but shifts reference voltage and requires PCB rework; the BZX55C16 matches voltage and package while improving ZZT, making it a closer functional alternative for space-constrained 16 V reference designs.
Availability
1N966B is available at Aetrix Electronics and suitable for industrial power supplies, aerospace voltage monitors, automotive sensor conditioning circuits, and test equipment requiring stable component supply with long lifecycle visibility.
Supply support for 1N966B 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 defense, aerospace, and industrial markets.
The 1N966B belongs to Microsemi's legacy JEDEC-registered 1N957B–1N992B Zener series, engineered for precision voltage regulation in mission-critical systems demanding extended temperature operation and intrinsic radiation tolerance.
FAQ
What is the Zener voltage tolerance for 1N966B?
The 1N966B has a nominal Zener voltage of 16 V with ±5% tolerance, as indicated by the "B" suffix per JEDEC standard. This means the actual measured VZ at 7.8 mA falls between 15.2 V and 16.8 V at 25°C. The tolerance remains valid across the full -65°C to +175°C operating range, though voltage drift follows the +0.083 %/°C coefficient.
Can 1N966B be used in surface-mount designs?
No - the 1N966B is exclusively offered in the axial-leaded DO-35 (DO-204AH) glass package and is not a surface-mount device. For SMT equivalents, Microsemi offers the MLL966B in DO-213AA (MELF) package; however, 1N966B itself requires through-hole mounting with 3/8″ lead length for thermal compliance.
What is the maximum power dissipation for 1N966B at room temperature?
The 1N966B is rated for 0.5 W steady-state power dissipation at a lead temperature (TL) of ≤50°C, measured 3/8″ from the body. When mounted on an FR4 PCB with specified copper pads, its derated power is 0.48 W at 25°C ambient. Exceeding these limits risks thermal runaway or parametric shift.
Does 1N966B require special ESD handling?
No - the 1N966B is nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020. It does not require ESD-safe packaging, wrist straps, or ionized workstations during handling or assembly, simplifying manufacturing for high-reliability production lines.
How does the temperature coefficient affect 1N966B performance in a 0–70°C environment?
With a +0.083 %/°C temperature coefficient, the 1N966B's Zener voltage increases by approximately 0.093 V over a 70°C rise (16 V × 0.00083 × 70). This predictable positive drift enables accurate compensation in analog circuits and confirms suitability for applications where monotonic voltage shift is acceptable or correctable.
1N966B 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):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 12.2 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
1N966B FAQ
1.How can I place an order for 1N966B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N966B 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 1N966B reliable?
The price and inventory of 1N966B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N966B is usually 5 days.
3.What payment methods are accepted for 1N966B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N966B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N966B?
1N966B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N966B 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 1N966B?
For technical support, including 1N966B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N966B requirements.
6.How does Aetrix verify that 1N966B is sourced from the original manufacturer or authorized distributors?
All 1N966B 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 1N966B meets industry standards.
7.What is the process for return or replacement of 1N966B?
All 1N966B units undergo pre-shipment inspection (PSI). If there is an issue with 1N966B, 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 1N966B part is unused and in its original packaging.
Return procedure for 1N966B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N966B 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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