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Microchip Technology 1N967A
- Part No.:
- 1N967A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N967A.pdf
- Description:
- DIODE ZENER 18V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:5,590
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Product details
Overview
1N967A from Microsemi is a silicon 500 mW axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 18 V nominal Zener voltage with ±10% tolerance, 7.0 mA Zener test current, and 21 Ω dynamic impedance at IZT. It operates across –65°C to +175°C and regulates voltage in low-power reference and protection circuits.
For engineers reviewing the 1N967A datasheet, 1N967A pinout, 1N967A application, or 1N967A equivalent, this part serves as a general-purpose voltage reference in analog power supplies, overvoltage clamping networks, and precision biasing where stable 18 V regulation under moderate current is required.
Technical Context
The 1N967A functions as a reverse-biased voltage regulator with a sharp breakdown knee, specified at 7.0 mA test current and characterized by 21 Ω Zener impedance (ZZT) at that point. Its temperature coefficient is +0.085 %/°C, indicating positive drift with rising junction temperature.
It is designed for operation with cathode band positive relative to anode, supports up to 110 mA maximum DC Zener current (IZM), and exhibits ≤5 μA reverse leakage at 13.7 V (0.75 × VZ). 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 | 18 V ±10% - defines regulated output level under 7.0 mA test current; usable range 16.2–19.8 V at 25°C |
| Zener Test Current | 7.0 mA - standard bias point for VZ measurement and impedance characterization |
| Zener Impedance | 21 Ω at IZT - determines regulation stiffness; voltage change ≈21 mV per 1 mA load variation near IZT |
| Max DC Zener Current | 110 mA - maximum continuous reverse current before exceeding 400 mW dissipation at 75°C lead temp |
| Reverse Leakage | ≤5 μA at 13.7 V - ensures minimal error current in high-impedance reference nodes |
| Temp Coefficient | +0.085 %/°C - predicts +15.3 mV/°C drift at 18 V; requires thermal management in precision circuits |
| Power Rating | 500 mW at TL < 50°C (3/8″ from body) - derates linearly above 50°C per Figure 1 |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed glass axial-leaded case with cathode indicated by color band. Tin-lead or RoHS-compliant matte-tin plating, weight 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-bias polarity requires cathode at higher potential |
| Cathode | Zener regulation output | Banded end; held at stable ~18 V above anode when reverse current ≥ IZK (knee current) |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| ±10% voltage tolerance (A suffix) | Cost-optimized for non-critical regulation where 1.8 V margin around 18 V is acceptable |
| Low reverse leakage (≤5 μA @ 13.7 V) | Minimizes loading error in high-impedance voltage divider or reference buffer applications |
| Wide operating temperature range | –65°C to +175°C operation enables use in automotive under-hood, industrial, and aerospace environments |
| Nonsensitive to ESD | Withstands MIL-STD-750 Method 1020 testing - no special handling required during assembly |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for Sensor Inputs |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator control loops or setting threshold in comparator circuits. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 18 V reference point for error amplifiers or comparators. Use Value: Delivers stable regulation with 21 Ω impedance and low temp drift, enabling ±1% output accuracy over temperature in discrete supply designs. |
Use Scenario: Protecting ADC input pins or op-amp inputs from transient overvoltage beyond rail limits. IC Role / Device Role / Timing Role: Shunt clamp device conducting excess current when sensor output exceeds 18 V. Use Value: Limits voltage to safe levels using 110 mA max IZM, preventing damage without requiring active control circuitry. |
| Legacy Equipment Voltage Calibration | Low-Cost Bias Network for Discrete Amplifiers |
Use Scenario: Replacing aging Zeners in field-serviceable test equipment requiring traceable 18 V references. IC Role / Device Role / Timing Role: Precision calibration node in multimeter front-end or oscilloscope attenuator stages. Use Value: JEDEC registration and tight batch consistency support metrology-grade repeatability in maintenance workflows. |
Use Scenario: Setting emitter or collector bias points in Class-A audio or RF transistor stages. IC Role / Device Role / Timing Role: Fixed-voltage source establishing DC operating point for bipolar junction transistors. Use Value: Low capacitance and stable 18 V output reduce signal distortion and improve thermal stability in analog gain blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N967B | Same 18 V nominal rating but ±5% tolerance (B suffix) and 700 Ω max ZZK at IZK; otherwise identical max ratings and package | Higher precision needed for tighter reference stability; lower leakage typical at same VR | Select 1N967B when ±0.9 V absolute tolerance is required instead of ±1.8 V |
| MMBZ5245B (ON Semiconductor) | SMT SOT-23 package; 18 V ±5%, 20 Ω ZZT, 200 mW rating; not drop-in compatible due to footprint and power derating | Used in space-constrained PCBs where through-hole DO-35 is impractical | Choose MMBZ5245B only if board redesign accommodates SMT placement and thermal relief |
Compared with 1N967A, the 1N967B offers tighter voltage tolerance for improved reference accuracy, while the MMBZ5245B provides surface-mount compatibility at reduced power handling-neither is pin-compatible, and both require layout or thermal validation for substitution.
Availability
1N967A is available at Aetrix Electronics and suitable for industrial power supplies, sensor protection circuits, and legacy equipment calibration requiring stable component supply and long-term obsolescence mitigation.
Supply support for 1N967A 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 1N957B–1N992B series was engineered for ruggedized, through-hole Zener regulation in mission-critical systems where wide temperature operation, ESD immunity, and JEDEC-standard consistency are mandatory.
FAQ
What is the Zener voltage tolerance for 1N967A?
The 1N967A has a nominal Zener voltage of 18 V with a ±10% tolerance, meaning its actual breakdown voltage falls between 16.2 V and 19.8 V at 25°C under 7.0 mA test current. This tolerance is designated by the "A" suffix per Microsemi's documentation and is wider than the ±5% offered by the 1N967B variant.
Can 1N967A be used in surface-mount designs?
No, the 1N967A is packaged exclusively in the axial-leaded DO-35 (DO-204AH) glass case and is not compatible with surface-mount assembly. For SMT equivalents, consider the MMBZ5245B or Microsemi's MLL967B in DO-213AA (MELF), which require PCB redesign and thermal re-evaluation due to different package thermal characteristics.
What is the maximum power dissipation for 1N967A at room temperature?
The 1N967A is rated for 500 mW steady-state power dissipation when lead temperature (TL) is maintained below 50°C at a 3/8″ (10 mm) distance from the body. At ambient temperature (TA) < 25°C on FR4 with specified copper pads, it delivers 480 mW - derating begins linearly above those thresholds per Figure 1 in the datasheet.
Does 1N967A have radiation-hardened properties?
Yes, the 1N967A exhibits inherent radiation hardness as documented in Microsemi MicroNote 050. This stems from its silicon process and hermetic DO-35 construction, making it suitable for low-dose-rate environments in aerospace and nuclear instrumentation where total ionizing dose (TID) resilience is valued.
How is polarity identified on the 1N967A package?
The cathode of the 1N967A is marked by a visible color band on the glass body; the banded end must be held at a higher potential than the unmarked (anode) end for proper Zener regulation. Reverse connection will forward-bias the diode, producing ~1.1 V drop and no regulation.
1N967A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 13.7 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
1N967A FAQ
1.How can I place an order for 1N967A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N967A 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 1N967A reliable?
The price and inventory of 1N967A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N967A is usually 5 days.
3.What payment methods are accepted for 1N967A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N967A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N967A?
1N967A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N967A 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 1N967A?
For technical support, including 1N967A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N967A requirements.
6.How does Aetrix verify that 1N967A is sourced from the original manufacturer or authorized distributors?
All 1N967A 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 1N967A meets industry standards.
7.What is the process for return or replacement of 1N967A?
All 1N967A units undergo pre-shipment inspection (PSI). If there is an issue with 1N967A, 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 1N967A part is unused and in its original packaging.
Return procedure for 1N967A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N967A Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
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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