My Inquiry
My Account
Microchip Technology 1N4624-1
- Part No.:
- 1N4624-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4624-1.pdf
- Description:
- DIODE ZENER 4.7V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4624-1 from Microsemi is a 500 mW, 4.7 V metallurgically bonded glass Zener diode in DO-35 package, qualified to JANTXV level per MIL-PRF-19500/435, with 5% voltage tolerance, 1550 Ω dynamic impedance at 250 mA test current, and max noise density of 1 µV/√Hz - used for precision voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4624-1 datasheet, 1N4624-1 pinout, 1N4624-1 application, or 1N4624-1 equivalent, this page delivers verified Zener voltage, thermal derating behavior, MIL-qualified reliability data, junction-to-lead thermal resistance, and RoHS-compliant commercial variants - all critical for high-reliability analog reference design and radiation-hardened subsystems.
Technical Context
The 1N4624-1 operates as a reverse-biased voltage reference with a nominal Zener voltage of 4.7 V at 250 mA test current (IZT), exhibiting a temperature coefficient of –0.050 %/°C (negative slope). Its metallurgical bond construction ensures stable breakdown characteristics across –65 °C to +175 °C junction temperature range.
It delivers low-noise regulation (1 µV/√Hz) and maintains 1550 Ω dynamic impedance (ZZT) under specified IZT, supporting stable reference performance in low-current analog monitoring and feedback loops where minimal voltage drift and predictable impedance are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V at 250 mA - defines precise regulation point for biasing and reference circuits |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating begins |
| Dynamic Impedance (ZZT) | 1550 Ω at 250 mA - determines output voltage variation under load current changes |
| Noise Density (ND) | 1 µV/√Hz - enables low-noise analog references in sensor front-ends and precision ADCs |
| Temp Coefficient (αVZ) | –0.050 %/°C - quantifies voltage drift over temperature; negative sign indicates decreasing VZ with rising TJ |
| Max Reverse Current (IR) | 3.0 µA at VR = 3.5 V - specifies leakage below breakdown, critical for standby power integrity |
| Junction Temp Range | –65 °C to +175 °C - supports operation in extreme environments including space and military platforms |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package; cathode indicated by band; banded end is positive during Zener regulation. Weight ≈ 0.2 g; lead length 25.4–38.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias return path | Connected to system ground or lower-potential node when regulating |
| Cathode | Zener regulation output | Banded end supplies stable 4.7 V reference when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability and reduced parameter shift under thermal cycling |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANTXV level for mission-critical aerospace and defense systems |
| Low noise density | 1 µV/√Hz enables use in high-resolution analog signal chains without added filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter degradation in humid or corrosive environments |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in board layout |
Applications
| Aerospace Power Conditioning | Defense System Reference Supplies |
|---|---|
Use Scenario: Regulating auxiliary 5 V rails in satellite power distribution units exposed to wide thermal swings and radiation. IC Role / Device Role / Timing Role: Zener diode providing stable 4.7 V reference for op-amp comparators and voltage monitors. Use Value: JANTXV qualification and –65 °C to +175 °C operation ensure uninterrupted regulation across orbital thermal cycles. | Use Scenario: Biasing precision amplifiers in radar receiver front-ends requiring ultra-low-noise references. IC Role / Device Role / Timing Role: Low-noise 4.7 V Zener reference source for analog signal conditioning stages. Use Value: 1 µV/√Hz noise density minimizes baseline ripple, preserving SNR in RF detection paths. |
| Industrial Sensor Signal Conditioning | Radiation-Hardened Instrumentation |
Use Scenario: Providing excitation voltage and reference for bridge-based pressure transducers in oilfield downhole tools. IC Role / Device Role / Timing Role: Stable 4.7 V Zener regulator establishing known bias point for Wheatstone bridge outputs. Use Value: –0.050 %/°C tempco and 1550 Ω ZZT enable <±0.5% total error over –40 °C to +125 °C operating range. | Use Scenario: Serving as voltage reference in nuclear reactor control instrumentation exposed to neutron flux. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference maintaining accuracy after 10⁵ rad(Si) total ionizing dose. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in TID environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4624UR-1 | Same electrical specs; DO-213AA surface-mount package instead of DO-35 axial leads | Required for automated SMT assembly; lacks axial mounting flexibility | Select when PCB space constraints or reflow-only manufacturing mandate SMT packaging |
| 1N4624-1e3 | Identical DO-35 package and Zener parameters; RoHS-compliant matte-tin plating vs. tin-lead | Required for EU/ROHS-regulated programs; same thermal and electrical behavior | Select for commercial-grade compliance without compromising reliability or performance |
Compared with 1N4624UR-1 and 1N4624-1e3, the 1N4624-1 offers legacy tin-lead termination and axial-leaded form factor ideal for through-hole prototyping, manual repair, and high-reliability military builds where solder joint fatigue resistance is prioritized over RoHS compliance.
Availability
1N4624-1 is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference supplies, and radiation-hardened instrumentation requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N4624-1 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) designs high-reliability analog, mixed-signal, and radiation-hardened semiconductors for aerospace, defense, and industrial markets.
The 1N4624-1 belongs to Microsemi's MIL-qualified Zener diode family engineered for precision voltage regulation in mission-critical systems where parameter stability, low noise, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for the 1N4624-1?
The 1N4624-1 has a standard ±5% Zener voltage tolerance at 25 °C, corresponding to a nominal 4.7 V regulation point ranging from 4.465 V to 4.935 V under specified test conditions. This tolerance is inherent to the JEDEC-registered part number and applies across its qualified reliability levels (JAN, JANTX, JANTXV, JANS).
Does the 1N4624-1 require heatsinking in typical operation?
No, the 1N4624-1 does not require external heatsinking for operation at ≤500 mW at 25 °C ambient, as its RθJL is 250 °C/W with 10 mm lead length. However, power must be linearly derated above 50 °C lead temperature, reaching zero dissipation at 175 °C - PCB copper area and lead length directly impact thermal performance.
Is the 1N4624-1 suitable for low-noise analog reference applications?
Yes, the 1N4624-1 delivers 1 µV/√Hz noise density at its 4.7 V Zener voltage, making it suitable for low-noise analog references in precision instrumentation. This value is confirmed in the Electrical Characteristics table and validated per Microsemi's noise measurement methodology using 1–3 kHz bandpass filtering at 250 mA test current.
What is the polarity marking convention for the 1N4624-1?
The 1N4624-1 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode to achieve Zener regulation. During normal operation, the cathode supplies the regulated 4.7 V output while the anode connects to ground or the lower-voltage rail.
Can the 1N4624-1 be used in radiation-intensive environments?
Yes, the 1N4624-1 is inherently radiation-hardened as documented in Microsemi MicroNote 050. Its metallurgically bonded glass construction and JANS-qualified variants provide proven resilience to total ionizing dose (TID) effects, enabling reliable operation in space, nuclear, and high-altitude avionics applications without parameter shift.
1N4624-1 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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1550 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 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
1N4624-1 FAQ
1.How can I place an order for 1N4624-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4624-1 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 1N4624-1 reliable?
The price and inventory of 1N4624-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4624-1 is usually 5 days.
3.What payment methods are accepted for 1N4624-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4624-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4624-1?
1N4624-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4624-1 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 1N4624-1?
For technical support, including 1N4624-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4624-1 requirements.
6.How does Aetrix verify that 1N4624-1 is sourced from the original manufacturer or authorized distributors?
All 1N4624-1 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 1N4624-1 meets industry standards.
7.What is the process for return or replacement of 1N4624-1?
All 1N4624-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4624-1, 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 1N4624-1 part is unused and in its original packaging.
Return procedure for 1N4624-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4624-1 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
