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Microchip Technology 1N5994UR/TR
- Part No.:
- 1N5994UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5994UR/TR.pdf
- Description:
- DIODE ZENER 5.6V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,186
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Product details
Overview
1N5994UR/TR from Microsemi is a surface-mount 5.6 V, 5% tolerance Zener diode in DO-213AA (SOD80) MELF package, rated for 500 mW power dissipation at 25°C, with 25 mA test current, 70 Ω dynamic impedance at IZT, and maximum reverse leakage of 3.0 µA at 4.0 V - used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N5994UR/TR datasheet, 1N5994UR/TR pinout, 1N5994UR/TR application, or 1N5994UR/TR equivalent, key selection criteria include Zener voltage accuracy (±5%), low dynamic impedance (70 Ω), thermal resistance (300 °C/W), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR suffix) for automated assembly.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-bias breakdown mode, with Zener voltage specified at 5.6 V ±5% under 25 mA DC test current (IZT). Its DO-213AA glass MELF package provides hermetic sealing and metallurgical bonding for high reliability across -65°C to +175°C junction temperature range.
Dynamic impedance is measured at 1 kHz with 10% rms AC current superimposed on IZT; reverse leakage is guaranteed ≤3.0 µA at 4.0 V. It exhibits a positive temperature coefficient of +0.035 %/°C, indicating stable regulation over temperature in mid-voltage Zener range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.6 V ±5% at 25 mA - defines precise regulation point for feedback networks and voltage references. |
| Power Dissipation (PD) | 0.5 W at 25°C ambient - sets maximum continuous power handling on FR4 board with standard footprint. |
| Dynamic Impedance (ZZT) | 70 Ω at 25 mA - determines output voltage stability under varying load current conditions. |
| Reverse Leakage (IR) | ≤3.0 µA at 4.0 V - ensures minimal error current in high-impedance bias/reference paths. |
| Junction Temperature Range | -65°C to +175°C - supports operation in harsh industrial, aerospace, and automotive environments. |
| Package Type | DO-213AA (SOD80/MELF) - enables high-reliability surface-mount assembly with hermetic glass seal. |
Pinout & Package
DO-213AA (SOD80) MELF glass package: cylindrical hermetically sealed body with tin-lead or RoHS-compliant matte-tin end-cap plating; cathode indicated by single band; polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current sink terminal in Zener mode | Connected to lower potential node; carries full Zener current when regulating. |
| Cathode (banded end) | Regulated voltage output node | Provides stable 5.6 V reference relative to anode; marked for orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount DO-213AA package | Enables automated pick-and-place assembly while maintaining hermeticity and thermal performance. |
| 5% Zener voltage tolerance | Supports tighter regulation accuracy than 10% variants without requiring trimming or calibration. |
| Low 70 Ω dynamic impedance | Minimizes output voltage variation under ±10% load current changes in feedback applications. |
| RoHS-compliant matte-tin plating | Ensures lead-free solder compatibility and long-term intermetallic reliability per MIL-STD-750. |
| Radiation-hardened construction | Inherently resistant to total ionizing dose (TID), validated per Microsemi MicroNote 050. |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter feedback path via optocoupler. IC Role / Device Role / Timing Role: Zener diode provides precise 5.6 V reference to TL431 shunt regulator input. Use Value: Tight 5% tolerance and low 70 Ω impedance ensure <±1% output regulation across line/load/temperature. |
Use Scenario: Supplies stable bias voltage to bridge-based pressure sensor signal conditioning circuit. IC Role / Device Role / Timing Role: Acts as low-drift voltage reference for instrumentation amplifier excitation. Use Value: +0.035 %/°C tempco and ≤3.0 µA leakage minimize offset drift over -40°C to +85°C operating range. |
| Automotive ECU Voltage Clamp | Avionics Board-Level Protection |
Use Scenario: Clamps transients on 5 V microcontroller I/O rail during load-dump events. IC Role / Device Role / Timing Role: Zener diode shunts excess energy to ground when voltage exceeds 5.6 V. Use Value: 0.5 W rating and -65°C to +175°C junction range support AEC-Q200–aligned transient suppression. |
Use Scenario: Provides regulated reference for analog-to-digital conversion in flight control module. IC Role / Device Role / Timing Role: Serves as primary voltage reference in radiation-sensitive avionics subsystem. Use Value: Inherent radiation hardness (MicroNote 050) eliminates need for shielding or derating in LEO missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C5V6 | Same 5.6 V ±5%, but DO-35 axial package; higher RθJA (500 °C/W); no RoHS option. | Requires through-hole assembly; unsuitable for high-density SMT layouts or reflow-only processes. | Select BZX55C5V6 only if legacy axial design or manual prototyping is required. |
| MMBZ5232BS | SOT-23 package; same 5.6 V ±5%; lower PD (225 mW); ZZT = 100 Ω; RoHS standard. | Limited power handling restricts use to low-current references (<10 mA); not suitable for >0.3 W regulation loads. | Choose MMBZ5232BS for space-constrained digital logic references where 0.5 W capability is unnecessary. |
Compared with BZX55C5V6 and MMBZ5232BS, the 1N5994UR/TR uniquely combines SMT-compatible DO-213AA packaging, 0.5 W power rating, 70 Ω dynamic impedance, and radiation-hardened construction - making it optimal for high-reliability industrial and aerospace voltage regulation where thermal robustness and hermeticity are critical.
Availability
1N5994UR/TR is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor interfaces, and automotive electronic control units requiring stable component supply with traceable sourcing and long-lifecycle support.
Supply support for 1N5994UR/TR 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 analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5994UR/TR belongs to Microsemi's legacy 1N5985BUR–1N6031BUR series of surface-mount Zener diodes, designed specifically for precision voltage regulation in mission-critical systems demanding hermetic packaging, wide temperature operation, and MIL-PRF-19500 screening compatibility.
FAQ
What is the Zener voltage and tolerance of the 1N5994UR/TR?
The 1N5994UR/TR has a nominal Zener voltage of 5.6 V with a tolerance of ±5%, specified at a test current of 25 mA. This value is guaranteed across the full operating temperature range and forms the basis for its use in precision regulation circuits where stable reference voltage is required without external trimming.
What package type does the 1N5994UR/TR use, and is it RoHS compliant?
1N5994UR/TR uses the DO-213AA (SOD80) glass MELF package with hermetically sealed construction and matte-tin end-cap plating. The "TR" suffix indicates tape-and-reel packaging, and the part is RoHS compliant per Microsemi documentation - confirmed for commercial-grade versions only.
What is the maximum power dissipation and thermal resistance of the 1N5994UR/TR?
The 1N5994UR/TR is rated for 0.5 W power dissipation at 25°C ambient temperature when mounted on an FR4 PCB with 1 oz copper. Its thermal resistance junction-to-ambient (RθJA) is 300 °C/W, and junction-to-end-cap (RθJL) is 150 °C/W - values verified under standardized test conditions per T4-LDS-0228-1.
How does the 1N5994UR/TR perform under reverse leakage conditions?
The 1N5994UR/TR guarantees maximum reverse leakage current of 3.0 µA at 4.0 V, measured at 30°C lead temperature. This low leakage supports high-impedance reference applications such as sensor biasing and op-amp feedback networks where parasitic current must be minimized.
Is the 1N5994UR/TR suitable for high-reliability or radiation-exposed environments?
Yes - the 1N5994UR/TR features inherent radiation hardness validated per Microsemi MicroNote 050 and supports MIL-PRF-19500 screening levels when ordered with appropriate prefixes. Its hermetic DO-213AA package and metallurgical bonding make it suitable for aerospace, defense, and nuclear instrumentation applications.
1N5994UR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.6 V
- Tolerance:
- ±20%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1.5 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)
1N5994UR/TR FAQ
1.How can I place an order for 1N5994UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5994UR/TR 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 1N5994UR/TR reliable?
The price and inventory of 1N5994UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5994UR/TR is usually 5 days.
3.What payment methods are accepted for 1N5994UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5994UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5994UR/TR?
1N5994UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5994UR/TR 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 1N5994UR/TR?
For technical support, including 1N5994UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5994UR/TR requirements.
6.How does Aetrix verify that 1N5994UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N5994UR/TR 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 1N5994UR/TR meets industry standards.
7.What is the process for return or replacement of 1N5994UR/TR?
All 1N5994UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5994UR/TR, 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 1N5994UR/TR part is unused and in its original packaging.
Return procedure for 1N5994UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5994UR/TR Tags
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