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Microchip Technology 1N5373BE3/TR8
- Part No.:
- 1N5373BE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373BE3/TR8.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
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Product details
Overview
1N5373BE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 68 V, ±5% tolerance (B suffix), 20 mA test current (IZT), 44 Ω dynamic impedance (ZZ), and 0.5 μA reverse leakage at 51.7 V (VR). 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 1N5373BE3/TR8 datasheet, 1N5373BE3/TR8 pinout, 1N5373BE3/TR8 application, or 1N5373BE3/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (500 A), voltage regulation (ΔVZ = 2.0 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, where stable Zener voltage is maintained across a wide range of current (10%–50% of IZM) and temperature. Its low dynamic impedance (44 Ω) and tight voltage regulation (ΔVZ = 2.0 V) ensure minimal output variation under load transients.
The 1N5373BE3/TR8 uses a void-free thermosetting epoxy case (UL94V-0), cathode band polarity marking, and is rated for 260 °C soldering (10 s). It achieves 5.0 W steady-state dissipation at TL < 25 °C with 3/8″ lead length, derating linearly above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% - defines precise clamping threshold for overvoltage protection circuits |
| Test Current (IZT) | 20 mA - operating point at which VZ and ZZ are specified; sets minimum bias requirement |
| Dynamic Impedance (ZZ) | 44 Ω - low AC resistance ensures stable regulation under varying load currents |
| Max Reverse Leakage (IR) | 0.5 μA @ 51.7 V - confirms low standby power loss in high-impedance reference paths |
| Max Regulator Current (IZM) | 500 mA - maximum DC current before thermal runaway when adequately heat-sunk |
| Surge Current (IZSM) | 500 A (8.3 ms half-sine) - supports transient suppression in surge-prone industrial environments |
| Voltage Regulation (ΔVZ) | 2.0 V - difference between VZ measured at 10% and 50% of IZM; quantifies regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by colored band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026; weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; accepts reverse current during regulation |
| Cathode | Regulated output terminal | Banded end; provides stable 68 V reference relative to anode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions and electrical behavior across global supply chain |
| 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) | Enables safe handling in standard manufacturing without special ESD controls |
| Thermal resistance: 25 °C/W (junction-to-lead) | Supports full 5 W dissipation with minimal heatsinking when leads are 10 mm from body |
| e3 RoHS-compliant plating | Meets EU RoHS Directive 2011/65/EU and China RoHS; compatible with Pb-free reflow |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback reference in isolated DC-DC converters delivering 48–72 V output. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 68 V threshold for error amplifier comparison. Use Value: Maintains ±0.5% output regulation over –40 °C to +85 °C ambient due to low ΔVZ and stable VZ temperature coefficient. |
Use Scenario: Clamping transient spikes on 48 V telecom distribution bus exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when bus voltage exceeds 68 V. Use Value: Withstands 500 A non-repetitive surge (8.3 ms) without degradation, preserving downstream MOSFET gate drivers. |
| Programmable Logic Controller (PLC) Input Conditioning | Test Equipment Reference Source |
Use Scenario: Scaling and limiting analog sensor inputs (e.g., 0–10 V) into 16-bit ADC front-end of modular PLC I/O module. IC Role / Device Role / Timing Role: Precision clamp limiting input swing to protect ADC input stage from overvoltage faults. Use Value: 44 Ω dynamic impedance ensures <10 mV deviation across 1–10 mA signal current range, preserving measurement fidelity. |
Use Scenario: Providing calibrated 68 V reference in benchtop multimeter calibration fixture requiring traceable voltage standards. IC Role / Device Role / Timing Role: Stable Zener reference source for null-comparison against DMM internal DAC outputs. Use Value: ±5% tolerance and <2.0 V ΔVZ enable verification of meter accuracy within ±0.1% full-scale error bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B (non-e3) | Same electrical specs but SnPb lead finish; not RoHS compliant | Restricted to legacy military/aerospace programs requiring Pb-based solder compatibility | Select only if Pb-containing assembly process is mandated and exemption applies |
| SMBJ5373B | Surface-mount SMB package; same VZ, IZT, ZZ, but higher thermal resistance (85 °C/W junction-to-ambient) | Used in space-constrained PCBs where axial leads are impractical; requires larger copper area for thermal management | Choose for automated SMT production; verify board-level thermal design meets 1.47 W derated power limit |
Compared with 1N5373BE3/TR8, the 1N5373B lacks RoHS compliance and requires Pb-based soldering, while SMBJ5373B trades axial mounting flexibility for SMT compatibility and demands stricter thermal layout control to sustain equivalent power handling.
Availability
1N5373BE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and programmable logic controller (PLC) input conditioning requiring stable component supply and long-term obsolescence mitigation.
Supply support for 1N5373BE3/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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5373BE3/TR8?
The 1N5373BE3/TR8 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its part number. This means its nominal 68 V regulation voltage falls within 64.6 V to 71.4 V at 25 °C with 20 mA test current. The e3 suffix confirms RoHS compliance but does not affect voltage tolerance.
Can the 1N5373BE3/TR8 be used in surface-mount designs?
No - the 1N5373BE3/TR8 is an axial-leaded T-18 package and is not suitable for direct SMT placement. For surface-mount equivalents, Microsemi offers the SMBJ5373B in SMB package. That part shares identical electrical specs but requires different thermal layout due to higher junction-to-ambient resistance (85 °C/W).
What is the maximum continuous power dissipation for the 1N5373BE3/TR8?
The 1N5373BE3/TR8 is rated for 5.0 W steady-state power dissipation at lead temperature (TL) below 25 °C with 3/8″ (10 mm) lead length from the body. Power must be linearly derated above 25 °C at 20 mW/°C, reaching zero at 125 °C TL, per Figure 1 in the official datasheet.
Does the 1N5373BE3/TR8 require dry packing before reflow soldering?
No - the 1N5373BE3/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it is not hygroscopic and does not require dry packing or baking prior to reflow. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during soldering.
How is polarity marked on the 1N5373BE3/TR8?
The 1N5373BE3/TR8 uses a cathode band marking: the banded end is the cathode and must be held at a more positive potential than the anode to operate in Zener breakdown. This polarity is critical - reverse connection will forward-bias the diode, causing unregulated conduction and possible failure at high current.
1N5373BE3/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:
- ±5%
- 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
1N5373BE3/TR8 FAQ
1.How can I place an order for 1N5373BE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373BE3/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 1N5373BE3/TR8 reliable?
The price and inventory of 1N5373BE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373BE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5373BE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373BE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373BE3/TR8?
1N5373BE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373BE3/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 1N5373BE3/TR8?
For technical support, including 1N5373BE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373BE3/TR8 requirements.
6.How does Aetrix verify that 1N5373BE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5373BE3/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 1N5373BE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5373BE3/TR8?
All 1N5373BE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373BE3/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 1N5373BE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5373BE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373BE3/TR8 Tags
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