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Microchip Technology 1N4709
- Part No.:
- 1N4709
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4709.pdf
- Description:
- DIODE ZENER 24V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,384
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Product details
Overview
1N4709 from Microsemi is a 500 mW, 24.0 V ±5% glass axial-leaded Zener diode in DO-7 (DO-204AA) package, rated for operation from –65 °C to +175 °C, with 0.24 V maximum voltage regulation (ΔVZ) between 10 µA and 100 µA test current, used for precision low-power voltage reference and regulation in analog power supply feedback paths.
For engineers reviewing the 1N4709 datasheet, 1N4709 pinout, 1N4709 application, or 1N4709 equivalent, this part serves as a JEDEC-registered, hermetically sealed, radiation-hardened Zener regulator with verified thermal resistance (300 °C/W junction-to-lead), tight regulation stability over temperature, and MIL-PRF-19500 screening options for high-reliability aerospace and defense systems.
Technical Context
The 1N4709 operates as a reverse-biased voltage reference diode with nominal Zener voltage of 24.0 V at 50 mA test current (IZT), delivering stable regulation across 10–100 µA operating range and exhibiting 0.01 µA maximum reverse leakage at 19.2 V (80% of VZ). Its DO-7 glass package features internal metallurgical bonding and tin-lead plated leads compliant with MIL-STD-750 Method 2026.
Thermal performance is defined for two mounting conditions: 300 °C/W junction-to-lead at 3/8″ lead length, or 360 °C/W junction-to-ambient on FR4 with specified copper pad geometry. Forward voltage is capped at 1.1 V @ 200 mA, confirming robust conduction capability during transient forward bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24.0 V ±5% - defines stable regulation point for feedback networks and reference circuits |
| Zener Test Current | 50 mA - standardized bias condition for measuring VZ and dynamic impedance |
| Voltage Regulation ΔVZ | 0.24 V max (10 µA to 100 µA) - quantifies regulation stability across low-current operating range |
| Max Reverse Leakage | 0.01 µA @ 19.2 V - ensures minimal error current in high-impedance reference nodes |
| Power Dissipation | 500 mW @ TL < 25 °C - sets absolute steady-state thermal limit with defined lead-mounting condition |
| Operating Temperature | –65 °C to +175 °C - enables deployment in extended-environment industrial and aerospace systems |
| Package | DO-7 (DO-204AA) glass axial-leaded - provides hermetic seal, ESD immunity per MIL-STD-750 Method 1020, and solderability per MIL-STD-750 Method 2026 |
Pinout & Package
DO-7 (DO-204AA) glass axial-leaded package with cathode indicated by colored band; leads are tin-lead plated, solderable, and polarity-critical for Zener operation (banded end positive relative to unbanded end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Unbanded lead | Connected to lower-potential node in reverse-bias configuration; carries full Zener current during regulation |
| Cathode | Banded lead | Connected to higher-potential node; voltage referenced to this terminal during Zener breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N47xx series definition for interchangeability and qualification consistency |
| Hermetic glass seal | Ensures long-term parameter stability and moisture resistance in harsh environments |
| Internal metallurgical bond | Meets military-grade mechanical reliability requirements per MIL-PRF-19500 |
| Radiation hardness | Inherently radiation-tolerant per Microsemi MicroNote 050 - suitable for space-qualified designs |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
Applications
| Industrial Power Supply Feedback | Aerospace Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated DC-DC converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Zener diode providing precise 24 V reference for TL431 or similar shunt regulator ICs. Use Value: Maintains ±5% output accuracy over –40 °C to +125 °C ambient with <0.24 V regulation drift across 10–100 µA bias range. |
Use Scenario: Generating stable reference voltage in satellite power management units exposed to total ionizing dose (TID). IC Role / Device Role / Timing Role: Radiation-hardened voltage reference element in redundant power monitor circuits. Use Value: Delivers verified regulation stability without parameter shift after 100 krad(Si) exposure per MicroNote 050. |
| Military Analog Signal Conditioning | High-Temperature Sensor Interface |
Use Scenario: Biasing precision op-amp input stages in ruggedized data acquisition modules. IC Role / Device Role / Timing Role: Low-noise, low-leakage (0.01 µA) Zener reference for rail-splitting and offset calibration. Use Value: Enables sub-mV offset control in JANTXV-screened systems operating up to +175 °C junction temperature. |
Use Scenario: Providing excitation voltage for RTD or thermistor bridges in downhole oil/gas instrumentation. IC Role / Device Role / Timing Role: High-temperature-stable Zener reference powering sensor bridge circuits. Use Value: Operates continuously at +150 °C ambient with derated power (≥300 mW) and no parameter degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4709UR | Same 24 V Zener voltage but in DO-213AA surface-mount package; identical electrical specs except thermal resistance (junction-to-case differs) | Used where PCB real estate is constrained and reflow assembly replaces through-hole mounting | Select 1N4709UR only when board layout requires SMT and thermal path allows for higher junction temperature rise |
| 1N4709-1 | Identical electrical and mechanical specs, but qualified to MIL-PRF-19500 JANTXV level with additional screening and traceability | Required for flight-critical avionics and defense electronics requiring extended reliability testing and lot traceability | Choose 1N4709-1 when program-level qualification mandates MIL-spec screening beyond commercial-grade 1N4709 |
Compared with 1N4709UR and 1N4709-1, the base 1N4709 offers optimal cost-performance balance for commercial and industrial applications where DO-7 axial mounting and standard JEDEC qualification suffice, while the alternatives address specific packaging or reliability requirements without altering core regulation behavior.
Availability
1N4709 is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage reference, military analog signal conditioning, and high-temperature sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N4709 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 aerospace, defense, and industrial markets.
The 1N4709 belongs to Microsemi's legacy 1N4678–1N4717 DO-7 Zener family, engineered for precision voltage regulation in mission-critical systems where parameter stability, hermetic sealing, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for the 1N4709?
The 1N4709 has a nominal Zener voltage of 24.0 V with a standard tolerance of ±5%, as confirmed in the Microsemi datasheet's Electrical Characteristics table. No suffix indicates this default tolerance; tighter tolerances (±2% or ±1%) require C or D suffixes respectively, which do not apply to the base 1N4709 part number.
What is the maximum power dissipation of the 1N4709 under standard conditions?
The 1N4709 is rated for 500 mW steady-state power dissipation when lead temperature (TL) is maintained below 25 °C with ≥3/8″ (10 mm) lead length from the glass body. Derating is required above 25 °C per the published power derating curve in Figure 2 of the datasheet.
Does the 1N4709 have radiation-hardened characteristics?
Yes, the 1N4709 is inherently radiation-hardened as documented in Microsemi MicroNote 050. This characteristic stems from its DO-7 glass construction and internal metallurgical bond, making it suitable for low-dose space applications without requiring additional hardening processes.
How is polarity marked on the 1N4709?
The 1N4709 uses a cathode band - a single colored ring near one end of the glass body - to indicate the cathode terminal. During Zener operation, the banded end must be held at a higher potential than the unbanded (anode) end, consistent with reverse-bias regulation mode.
Can the 1N4709 be used in surface-mount designs?
No - the 1N4709 itself is a DO-7 axial-leaded device and is not surface-mount compatible. However, Microsemi offers the functionally equivalent 1N4709UR in DO-213AA surface-mount package with identical Zener voltage and electrical specifications, intended for reflow-soldered PCBs.
1N4709 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 nA @ 18.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4709 FAQ
1.How can I place an order for 1N4709 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4709 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 1N4709 reliable?
The price and inventory of 1N4709 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4709 is usually 5 days.
3.What payment methods are accepted for 1N4709?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4709 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4709?
1N4709 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4709 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 1N4709?
For technical support, including 1N4709 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4709 requirements.
6.How does Aetrix verify that 1N4709 is sourced from the original manufacturer or authorized distributors?
All 1N4709 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 1N4709 meets industry standards.
7.What is the process for return or replacement of 1N4709?
All 1N4709 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4709, 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 1N4709 part is unused and in its original packaging.
Return procedure for 1N4709:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4709 Tags
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