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Microchip Technology 1N5373CE3/TR8
- Part No.:
- 1N5373CE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373CE3/TR8.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,160
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Product details
Overview
1N5373CE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 68 V, ±2% tolerance (C suffix), 20 mA test current, 44 Ω dynamic impedance at IZT, and maximum reverse leakage of 0.5 μA at 51.7 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5373CE3/TR8 datasheet, 1N5373CE3/TR8 pinout, 1N5373CE3/TR8 application, or 1N5373CE3/TR8 equivalent, this page delivers verified electrical specs, thermal behavior, RoHS-compliant packaging, and direct alternatives for stable 68 V regulation under varying load and temperature conditions.
Technical Context
This device functions as a two-terminal voltage reference where cathode-banded polarity defines forward conduction direction and reverse-biased operation enables stable Zener breakdown. Its low 44 Ω dynamic impedance at 20 mA ensures minimal voltage shift across operating current range.
Thermal resistance is specified as 25 °C/W junction-to-lead (3/8″ lead length) and 85 °C/W junction-to-ambient on FR4 PCB - critical for derating above 25 °C. The e3/TR8 suffix confirms RoHS compliance and tape-and-reel packaging per EIA-296.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±2% at 20 mA - precise reference point for feedback loops and clamp thresholds. |
| Power Dissipation | 5.0 W at TL = 25 °C - requires heatsinking or board copper area for sustained high-current operation. |
| Dynamic Impedance (ZZ) | 44 Ω at IZT = 20 mA - low AC resistance improves regulation stability under dynamic load changes. |
| Reverse Leakage (IR) | 0.5 μA max at VR = 51.7 V - ensures minimal standby current in high-impedance bias networks. |
| Max Regulator Current (IZM) | 500 mA - derived from P/VZM = 5 W / 69.4 V, defining safe DC current ceiling with margin. |
| Surge Current (IZSM) | 500 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure. |
| Operating Temperature | –65 °C to +150 °C - validated for harsh environments including automotive under-hood and industrial motor drives. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band, leads plated with RoHS-compliant matte tin, weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in Zener configuration | Connected to system ground or lower-potential rail; forms return path during reverse breakdown. |
| Cathode | Regulated output node in Zener configuration | Banded end; held at stable 68 V relative to anode when reverse biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Guarantees mechanical and electrical interchangeability across 1N53xxB series per industry standard. |
| ±2% voltage tolerance (C suffix) | Enables tighter feedback loop control vs. ±5% (B) or ±10% (A) variants in precision references. |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during manual or automated placement. |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with lead-free matte tin plating and halogen-free epoxy body. |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode provides fixed 68 V reference to optocoupler LED or TL431 cathode input. Use Value: Tight ±2% tolerance ensures consistent output voltage accuracy across line/load/temperature variations. |
Use Scenario: Clamping surge transients on 48 V DC bus in telecom rectifier modules. IC Role / Device Role / Timing Role: Shunts excess energy to ground when bus exceeds 68 V, protecting downstream MOSFETs and controllers. Use Value: 500 A surge rating handles repetitive lightning-induced spikes without degradation. |
| Programmable Reference Source | High-Temperature Sensor Biasing |
|
Use Scenario: Generating stable bias voltage for analog front-end circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Serves as primary reference for DAC output scaling or ADC input conditioning. Use Value: Low 44 Ω dynamic impedance minimizes voltage droop during fast step-load transitions. |
Use Scenario: Providing excitation voltage to RTD or thermistor bridges in oil & gas downhole instrumentation. IC Role / Device Role / Timing Role: Delivers regulated 68 V bias under continuous 125 °C ambient exposure. Use Value: Guaranteed operation to +150 °C junction temperature enables reliable long-term deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B | Same 68 V nominal, but ±5% tolerance (B suffix); higher IR (1.0 μA at 51.7 V) | Suitable where cost priority outweighs precision; less stable under wide temperature swings | Select when ±5% regulation accuracy suffices and legacy B-suffix inventory exists. |
| MMBZ5263BS-7-F | Surface-mount SOD-123 package; 68 V ±5%, 200 mW rating; not power-compatible | Only viable for low-power signal-level referencing, not 5 W clamping or regulation | Choose only for space-constrained PCBs where thermal design supports <200 mW dissipation. |
Compared with 1N5373B and MMBZ5263BS-7-F, the 1N5373CE3/TR8 uniquely delivers ±2% tolerance, 5 W power handling, and axial-leaded through-hole mounting - making it the sole option for high-accuracy, high-power, and mechanically robust Zener regulation in industrial systems.
Availability
1N5373CE3/TR8 is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection clamps, programmable reference sources, and high-temperature sensor biasing requiring stable component supply and full RoHS compliance.
Supply support for 1N5373CE3/TR8 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N53xxB Zener series was engineered for ruggedized voltage regulation in mission-critical power systems where precision, surge resilience, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5373CE3/TR8?
The 1N5373CE3/TR8 has a Zener voltage tolerance of ±2%, indicated by the "C" suffix in its part number. This means its measured breakdown voltage at 20 mA test current falls within 66.64 V to 69.36 V at 25 °C. This tighter tolerance supports higher-accuracy feedback and reference applications compared to ±5% (B) or ±10% (A) variants.
Does the 1N5373CE3/TR8 require moisture preconditioning before reflow?
No, the 1N5373CE3/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity Level 1, meaning it is not hygroscopic and does not require dry pack or baking prior to soldering. Its void-free thermosetting epoxy body inherently resists moisture absorption, simplifying manufacturing flow.
What is the maximum steady-state power dissipation for the 1N5373CE3/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz Cu, 4 mm² copper pad, 1 mm track width, 25 mm length), the 1N5373CE3/TR8 has a steady-state power rating of 1.47 W at 25 °C ambient. Derating follows 85 °C/W thermal resistance - power must be reduced linearly above 25 °C to maintain junction temperature ≤150 °C.
Can the 1N5373CE3/TR8 be used as a direct replacement for the 1N5373B?
The 1N5373CE3/TR8 shares identical voltage rating and package with the 1N5373B but offers ±2% tolerance versus ±5%, lower reverse leakage (0.5 μA vs. 1.0 μA), and RoHS compliance (e3). It is mechanically and electrically compatible, though tighter tolerance may affect loop stability in legacy designs calibrated for looser spec.
What is the surge current rating of the 1N5373CE3/TR8 and how is it defined?
The 1N5373CE3/TR8 has a peak non-repetitive surge current (IZSM) rating of 500 A, defined per JEDEC as the maximum amplitude of a single 8.3 ms half-sine waveform. This rating validates its use in transient voltage suppression applications such as telecom line protection and motor drive snubbing.
1N5373CE3/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 49 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- T-18
1N5373CE3/TR8 FAQ
1.How can I place an order for 1N5373CE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373CE3/TR8 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 1N5373CE3/TR8 reliable?
The price and inventory of 1N5373CE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373CE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5373CE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373CE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373CE3/TR8?
1N5373CE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373CE3/TR8 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 1N5373CE3/TR8?
For technical support, including 1N5373CE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373CE3/TR8 requirements.
6.How does Aetrix verify that 1N5373CE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5373CE3/TR8 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 1N5373CE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5373CE3/TR8?
All 1N5373CE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373CE3/TR8, 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 1N5373CE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5373CE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373CE3/TR8 Tags
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