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Microchip Technology 1N969B
- Part No.:
- 1N969B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N969B.pdf
- Description:
- DIODE ZENER 22V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:2,214
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Product details
Overview
1N969B from Microsemi is a silicon 500 mW axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 22 V nominal Zener voltage at 5.6 mA test current, with ±5% tolerance (B suffix), 750 Ω maximum Zener impedance at IZT, and +0.087 %/°C temperature coefficient. It regulates voltage in low-power reference and protection circuits across industrial and aerospace systems.
For engineers reviewing the 1N969B datasheet, 1N969B pinout, 1N969B application, or 1N969B equivalent, key selection criteria include its 22 V regulation point, 5.6 mA Zener test current, 750 Ω dynamic impedance, -65°C to +175°C operating temperature range, and DO-35 glass-body axial-leaded mechanical form factor.
Technical Context
The 1N969B operates as a reverse-biased voltage reference diode, maintaining stable 22 V regulation over 16 mA to 16 mA DC Zener current range (IZM = 16 mA), with minimal capacitance (<1.5 pF typical per Figure 3) and inherent radiation hardness per MicroNote 050. Its Zener knee is verified via dual-point dynamic impedance measurement per JEDEC standards.
Thermal design requires attention to junction-to-lead resistance (250 °C/W at 10 mm lead length) and power derating above 50 °C lead temperature. The device uses tin-lead or RoHS-compliant matte-tin plating and is marked with cathode band polarity for unambiguous orientation during PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 22 V ±5% - defines regulated output voltage under 5.6 mA test current; used for precision biasing and reference generation |
| Zener Test Current (IZT) | 5.6 mA - required bias current to achieve specified 22 V regulation; sets minimum operating current for stable performance |
| Zener Impedance (ZZT) | 750 Ω max @ IZT - limits voltage deviation under load transients; impacts regulation accuracy in feedback loops |
| Max DC Zener Current (IZM) | 16 mA - maximum continuous reverse current before exceeding 400 mW dissipation at 75 °C lead temp |
| Reverse Leakage Current | 5 μA max @ 16.7 V - ensures low standby power loss in high-impedance sensing or clamping applications |
| Temp. Coefficient (αVZ) | +0.087 %/°C - quantifies voltage drift with temperature; enables compensation in wide-temp-range designs |
| Operating Temperature | -65°C to +175°C - supports deployment in harsh environments including avionics and downhole electronics |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed axial-lead glass body, 0.2 g weight, cathode indicated by color band. Tin-lead or RoHS-compliant matte-tin plating, solderable 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 confirms standard silicon diode behavior |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; reverse-bias polarity essential for regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| Internal metallurgical bond option (-1 suffix) | Enables enhanced reliability for military/aerospace use without changing footprint or electrical specs |
| RoHS compliance (e3 suffix) | Meets environmental regulations without sacrificing thermal or electrical performance |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for additional ESD protection circuitry in handling and assembly |
| Minimal capacitance | Typical <1.5 pF enables use in RF-coupled bias networks and high-frequency clamp circuits |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 22 V reference for linear regulator feedback or ADC reference divider in industrial PLC modules. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 22 V reference point independent of input ripple or load variation. Use Value: Enables ±0.5% output regulation accuracy over -40°C to +85°C ambient using only passive components and no active ICs. |
Use Scenario: Protection of microcontroller I/O pins against transient surges on 24 V sensor bus lines in factory automation. IC Role / Device Role / Timing Role: Shunt clamping device that conducts above 22 V to limit voltage excursion and protect downstream CMOS inputs. Use Value: Absorbs up to 16 mA continuous fault current while holding clamped voltage within 22.5 V, preventing latch-up or gate oxide damage. |
| Temperature-Stable Biasing | Radiation-Hardened Reference |
Use Scenario: Biasing amplifier stages in outdoor telecom base station front-end circuits exposed to wide ambient swings. IC Role / Device Role / Timing Role: Precision bias generator compensating for transistor VBE drift using predictable +0.087 %/°C coefficient. Use Value: Maintains amplifier quiescent point within ±2% over -30°C to +70°C, reducing calibration frequency and field failure rate. |
Use Scenario: Voltage reference in satellite telemetry subsystems requiring long-term stability under ionizing radiation. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference per MicroNote 050, delivering stable 22 V output after 100 krad(Si) exposure. Use Value: Eliminates need for shielding or redundant references in LEO missions, reducing SWaP-C and qualification cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A (ON Semiconductor) | 22 V ±5%, 1 W rating, DO-41 package, 20 Ω ZZT, +0.085 %/°C | Higher power handling but larger footprint; not suitable for space-constrained DO-35 layouts | Select when >500 mW surge capability is needed and board area allows DO-41 mounting |
| MMBZ5248B (Diodes Inc.) | 22 V ±5%, 225 mW SOT-23 package, 30 Ω ZZT, +0.085 %/°C | Surface-mount alternative with lower power rating and different thermal path; requires re-layout | Select for automated assembly and compact PCBs where 225 mW continuous dissipation suffices |
Compared with 1N969B, the 1N4748A offers higher surge margin but demands more board space, while the MMBZ5248B enables miniaturization at the cost of reduced power handling and different thermal management requirements.
Availability
1N969B is available at Aetrix Electronics and suitable for industrial control systems, aerospace power conditioning, and radiation-tolerant instrumentation requiring stable component supply and long-lifecycle support.
Supply support for 1N969B 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, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N969B belongs to Microsemi's legacy 1N957B–1N992B Zener series, designed specifically for ruggedized voltage regulation in extreme-temperature and high-reliability applications where long-term parametric stability is critical.
FAQ
What is the Zener voltage tolerance for 1N969B?
The 1N969B has a nominal Zener voltage of 22 V with ±5% tolerance, as indicated by the "B" suffix per JEDEC registration. This means the actual measured VZ falls between 20.9 V and 23.1 V at 5.6 mA test current and 25 °C ambient. The tolerance is guaranteed across the full -65°C to +175°C operating range, though voltage drift follows the +0.087 %/°C coefficient.
Can 1N969B be used in surface-mount designs?
No, the 1N969B is exclusively packaged in the axial-lead DO-35 (DO-204AH) glass body and is not a surface-mount device. For SMT equivalents, Microsemi offers the MLL969B in DO-213AA (MELF) package, and third-party alternatives like MMBZ5248B exist in SOT-23. Substituting 1N969B into an SMT layout would require mechanical adaptation and is not recommended.
What is the maximum power dissipation for 1N969B at 75°C lead temperature?
At 75°C lead temperature (measured 10 mm from the DO-35 body), the 1N969B is rated for 400 mW maximum steady-state power dissipation. This corresponds to a maximum DC Zener current of 16 mA (400 mW ÷ 22 V ≈ 18.2 mA, derated to 16 mA per datasheet Note 4 to account for Zener impedance and junction heating).
Does 1N969B require external heat sinking?
No external heat sink is required for 1N969B under standard conditions. Its thermal resistance is 250 °C/W junction-to-lead at 10 mm lead length. With proper PCB copper pour (4 mm² pads, 1 mm track width, 25 mm length on FR4), it achieves 310 °C/W junction-to-ambient, enabling full 500 mW operation only below 50°C lead temperature. Derating applies above that threshold per Figure 1.
Is 1N969B compliant with RoHS directives?
The base 1N969B is not RoHS-compliant; however, the RoHS-compliant version is designated 1N969Be3, with annealed matte-tin plating instead of tin-lead. Both share identical electrical and thermal specifications. When ordering for RoHS-constrained programs, specify the "e3" suffix explicitly-no other suffix changes affect compliance status.
1N969B 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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 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
1N969B FAQ
1.How can I place an order for 1N969B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N969B 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 1N969B reliable?
The price and inventory of 1N969B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N969B is usually 5 days.
3.What payment methods are accepted for 1N969B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N969B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N969B?
1N969B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N969B 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 1N969B?
For technical support, including 1N969B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N969B requirements.
6.How does Aetrix verify that 1N969B is sourced from the original manufacturer or authorized distributors?
All 1N969B 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 1N969B meets industry standards.
7.What is the process for return or replacement of 1N969B?
All 1N969B units undergo pre-shipment inspection (PSI). If there is an issue with 1N969B, 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 1N969B part is unused and in its original packaging.
Return procedure for 1N969B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N969B 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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