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Microchip Technology 1N4370A-1
- Part No.:
- 1N4370A-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4370A-1.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,229
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Product details
Overview
1N4370A-1 from Microsemi is a 2.4 V, ±5% tolerance, 500 mW axial-leaded silicon Zener diode in DO-35 (DO-204AH) glass package, qualified to JANTXV level per MIL-PRF-19500/127, with 30 Ω dynamic impedance at 20 mA and -0.085 %/°C temperature coefficient - used for precision voltage regulation in military power supply reference circuits.
For engineers reviewing the 1N4370A-1 datasheet, 1N4370A-1 pinout, 1N4370A-1 application, or 1N4370A-1 equivalent, key selection factors include its 2.4 V nominal Zener voltage, 30 Ω Zener impedance at IZT = 20 mA, -65 °C to +175 °C operating temperature range, hermetically sealed DO-35 package, and JANTXV qualification for high-reliability aerospace systems.
Technical Context
The 1N4370A-1 operates as a reverse-biased voltage reference device with metallurgical bonding for thermal stability and radiation hardness. Its Zener breakdown occurs at 2.4 V ±5% under 20 mA test current, exhibiting low dynamic impedance (30 Ω) and negative temperature coefficient (-0.085 %/°C), making it suitable for low-voltage stabilization where drift must be minimized across wide temperature excursions.
It is rated for 0.5 W average power dissipation at 50 °C lead temperature, derating linearly to zero at 175 °C, and supports 100 µA maximum reverse leakage at 1.0 V VR. The cathode band marking defines polarity, and operation requires the banded end to be positive relative to the anode for regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 2.4 V at IZT = 20 mA - sets precise low-voltage reference point for biasing or feedback networks. |
| Zener Tolerance | ±5% - defines initial accuracy band for calibration-critical applications without trimming. |
| Zener Impedance | 30 Ω at IZT = 20 mA - determines output voltage variation under load current changes. |
| Temp. Coefficient | -0.085 %/°C - quantifies voltage drift magnitude per degree Celsius rise in junction temperature. |
| Max. Power Dissipation | 0.5 W at TL = 50 °C - establishes thermal design margin for PCB trace width and lead length planning. |
| Reverse Leakage | 100 µA at VR = 1.0 V - limits standby current in high-impedance sensing or battery-backed circuits. |
| Operating Temp. | -65 °C to +175 °C - enables deployment in extreme environments including space-grade and engine bay electronics. |
Pinout & Package
Package: Hermetically sealed axial-leaded glass DO-35 (DO-204AH) case with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by colored band; weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-bias current flows into cathode and out anode during regulation. |
| Cathode (banded end) | Regulated output node | Provides stable 2.4 V relative to anode when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| JANTXV qualification | MIL-PRF-19500/127 certified for high-reliability aerospace and defense systems with full lot traceability. |
| Metallurgical bond construction | Enhances thermal cycling endurance and long-term parameter stability under mechanical stress. |
| Low capacitance | Minimizes signal coupling in RF-adjacent or high-speed analog reference paths. |
| Radiation hardness | Inherently resistant to total ionizing dose (TID), validated per Microsemi MicroNote 050 for space applications. |
| ESD robustness | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling. |
Applications
| Avionics Power Reference | Satellite Sensor Biasing |
|---|---|
Use Scenario: Providing stable 2.4 V reference for ADC front-end conditioning in flight control computers. IC Role / Device Role / Timing Role: Zener voltage reference for precision analog-to-digital conversion subsystems. Use Value: Maintains <±0.1% output shift over -55 °C to +125 °C operational range due to low tempco and JANTXV process control. | Use Scenario: Biasing photodiode amplifiers in star tracker optical sensors aboard LEO satellites. IC Role / Device Role / Timing Role: Low-noise, radiation-hardened voltage reference for analog signal chain integrity. Use Value: Delivers stable regulation despite 100 krad(Si) TID exposure and thermal vacuum cycling per MIL-STD-883. |
| Tactical Radio Voltage Clamp | Missile Guidance Interface |
Use Scenario: Clamping transient surges on 3.3 V logic rails in handheld HF/VHF transceivers exposed to EMP. IC Role / Device Role / Timing Role: Overvoltage protection element leveraging sharp Zener knee and low ZZT. Use Value: Limits rail excursion to ≤2.6 V during 100 ns spikes without latch-up or parametric shift. | Use Scenario: Setting reference thresholds for analog comparators in inertial measurement unit (IMU) fault detection circuits. IC Role / Device Role / Timing Role: Precision voltage threshold generator for real-time health monitoring logic. Use Value: Ensures comparator trip points remain within ±1.2% over full mission temperature profile (-40 °C to +85 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4370AUR-1 | Same electrical specs but RoHS-compliant matte-tin plating; commercial grade only, no MIL qualification. | Lacks JAN/JANTX/JANTXV screening - unsuitable for defense/aerospace programs requiring MIL-PRF-19500 compliance. | Select when RoHS compliance is mandatory and military reliability testing is not required. |
| 1N4730A | 2.4 V, ±5%, DO-41 package; 0.5 W rating; 30 Ω ZT; but no MIL qualification or radiation hardness data. | Not qualified to MIL-PRF-19500; higher thermal resistance (RθJA ≈ 500 °C/W vs. 300 °C/W); unsuitable for high-temp or radiation environments. | Select for cost-sensitive industrial designs where extended temperature range and radiation tolerance are not needed. |
Compared with 1N4370AUR-1 and 1N4730A, the 1N4370A-1 uniquely combines JANTXV-level screening, hermetic DO-35 packaging, and documented radiation hardness - critical for mission-critical avionics where parameter drift or failure under stress cannot be tolerated.
Availability
1N4370A-1 is available at Aetrix Electronics and suitable for avionics power reference, satellite sensor biasing, tactical radio voltage clamping, and missile guidance interface applications requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4370A-1 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade analog and mixed-signal components.
The 1N4370A-1 belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for voltage regulation in defense, space, and high-temperature industrial systems where long-term stability and environmental resilience are non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N4370A-1?
The 1N4370A-1 has a nominal Zener voltage of 2.4 V with a tolerance of ±5% at IZT = 20 mA, as defined by the "A" suffix in its nomenclature per MIL-PRF-19500/127. This tolerance applies across the full operating temperature range and is verified during JANTXV-level screening. The 1N4370A-1 maintains this specification under specified thermal and electrical conditions without requiring external trimming.
Is the 1N4370A-1 suitable for space applications?
Yes, the 1N4370A-1 is inherently radiation-hardened per Microsemi MicroNote 050 and qualified to JANTXV level under MIL-PRF-19500/127, supporting total ionizing dose (TID) resilience required in LEO and GEO satellite systems. Its hermetic DO-35 package and metallurgical bond structure further ensure reliability in vacuum and thermal cycling environments - key attributes for the 1N4370A-1 in space-grade designs.
What is the maximum power dissipation of the 1N4370A-1 at 75 °C ambient?
At TA = 75 °C on an FR4 PCB with 1 oz copper, the 1N4370A-1 is rated for 400 mW average power dissipation, linearly derating from 500 mW at 55 °C to zero at 175 °C per Figure 2 in T4-LDS-0288. This value accounts for RθJA = 300 °C/W and ensures safe junction temperature operation - a critical thermal limit for sustained performance of the 1N4370A-1 in enclosed enclosures.
Does the 1N4370A-1 have RoHS-compliant variants?
Yes, the 1N4370AUR-1 is the RoHS-compliant variant of the 1N4370A-1, featuring annealed matte-tin plating and identical electrical specifications. However, the 1N4370AUR-1 is commercial-grade only and lacks MIL-PRF-19500 qualification - meaning it does not carry JAN, JANTX, or JANTXV reliability levels. For RoHS compliance without sacrificing military screening, the 1N4370A-1 itself is not RoHS-compliant.
How is polarity marked on the 1N4370A-1?
The 1N4370A-1 uses a cathode band - a visible colored ring near one end of the DO-35 glass body - to indicate the cathode terminal. For proper Zener regulation, the banded end must be held positive relative to the unbanded (anode) end. This polarity marking is laser-etched or painted per MIL-STD-750 and is consistent across all units in the 1N4370A-1 production lot.
1N4370A-1 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):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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-204AH (DO-35)
1N4370A-1 FAQ
1.How can I place an order for 1N4370A-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4370A-1 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 1N4370A-1 reliable?
The price and inventory of 1N4370A-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4370A-1 is usually 5 days.
3.What payment methods are accepted for 1N4370A-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4370A-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4370A-1?
1N4370A-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4370A-1 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 1N4370A-1?
For technical support, including 1N4370A-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4370A-1 requirements.
6.How does Aetrix verify that 1N4370A-1 is sourced from the original manufacturer or authorized distributors?
All 1N4370A-1 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 1N4370A-1 meets industry standards.
7.What is the process for return or replacement of 1N4370A-1?
All 1N4370A-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4370A-1, 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 1N4370A-1 part is unused and in its original packaging.
Return procedure for 1N4370A-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4370A-1 Tags
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