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Microchip Technology 1N5373/TR12
- Part No.:
- 1N5373/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373/TR12.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,958
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Product details
Overview
1N5373/TR12 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, 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 regulates voltage in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5373/TR12 datasheet, 1N5373/TR12 pinout, 1N5373/TR12 application, or 1N5373/TR12 equivalent, this page delivers verified electrical specs, thermal derating behavior, JEDEC T-18 package details, RoHS-compliant plating, and validated alternatives for 68 V Zener regulation in industrial power designs.
Technical Context
This device functions as a precision voltage reference by operating in reverse breakdown, maintaining stable 68 V across its cathode–anode terminals under controlled DC current. Its low dynamic impedance (44 Ω) ensures minimal voltage shift with load current variation, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking.
The 1N5373/TR12 complies with JEDEC registration for the 1N53xxB series and features moisture sensitivity Level 1 per J-STD-020B-no dry pack required. Cathode polarity is marked by a band; operation requires the banded end to be positive relative to the unmarked end.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% - defines precise regulation point for feedback loops and clamping thresholds |
| Test Current (IZT) | 20 mA - standard bias condition for measuring VZ and ZZ; sets minimum operating current for stable regulation |
| Dynamic Impedance (ZZ) | 44 Ω at IZT - determines output voltage deviation under load transients; lower value improves regulation fidelity |
| Max Reverse Leakage (IR) | 0.5 μA at 51.7 V - ensures negligible standby current in high-impedance reference paths |
| Max Regulator Current (IZM) | 500 mA - peak continuous DC current before thermal runaway when adequately heat sunk |
| Power Dissipation (PD) | 5.0 W at TL = 25 °C - rated steady-state power handling with 3/8″ lead length heat sinking |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design using lead conduction; derates linearly above 25 °C |
| Operating Temperature | –65 °C to +150 °C - supports deployment in automotive engine compartments and industrial control enclosures |
Pinout & Package
Package: JEDEC T-18 axial-leaded plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by color band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased Zener terminal | Connected to higher potential node; voltage regulation occurs across cathode-to-anode drop |
| Anode (unbanded end) | Reference/ground return path | Typically tied to circuit ground or low-side reference; completes reverse-bias current path |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xxB series compliance | Guarantees mechanical interchangeability and standardized test conditions across manufacturers |
| ±5% voltage tolerance (B suffix) | Enables predictable regulation without post-manufacture trimming in cost-sensitive applications |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to PCB assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-safe workstations during assembly |
| High surge current rating (500 A) | Withstands transient overvoltages such as inductive kickback or lightning-induced surges |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference establishes precise 68 V threshold that triggers error amplifier when output exceeds target. Use Value: Tight ±5% tolerance and low ΔVZ (2.0 V) ensure output regulation within ±1.5% over line/load/temperature. | Use Scenario: Placed across DC bus in motor drive inverters to clamp transient spikes exceeding safe rail voltage. IC Role / Device Role / Timing Role: Acts as passive crowbar element, conducting only when bus voltage exceeds 68 V + margin. Use Value: 500 A surge rating absorbs 8.3 ms half-sine transients without degradation, protecting downstream IGBTs. |
| Voltage Reference for Analog Circuits | Field Instrument Calibration Standard |
Use Scenario: Provides stable 68 V reference for 16-bit DAC output scaling in programmable power supplies. IC Role / Device Role / Timing Role: Serves as primary shunt reference; feeds precision op-amp buffer stage driving DAC reference input. Use Value: 44 Ω ZZ and <0.5 μA IR minimize loading error and drift, enabling <0.01% reference stability. | Use Scenario: Embedded in handheld multimeter calibration firmware to verify high-voltage range accuracy at 60–75 V points. IC Role / Device Role / Timing Role: Functions as traceable on-board reference source during self-test and field recalibration routines. Use Value: JEDEC registration and MIL-PRF-19500 screening options (e.g., JANTXV) support metrology-grade repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B | No TR12 tape-and-reel packaging; bulk or ammo pack only | Same electrical specs and T-18 package; unsuitable for automated pick-and-place | Select 1N5373/TR12 for SMT line compatibility; choose 1N5373B for manual prototyping or low-volume hand assembly |
| MMBZ5268B | Surface-mount SOT-23 package; 0.5 W rating; 68 V ±5%; 100 Ω ZZ | Lower power, smaller footprint; not interchangeable due to package and thermal limits | Use MMBZ5268B only in space-constrained, low-power (<100 mW) applications where 5 W dissipation is unnecessary |
Compared with 1N5373B and MMBZ5268B, the 1N5373/TR12 uniquely combines JEDEC T-18 axial form factor, 5 W power handling, tape-and-reel automation readiness, and ±5% regulation accuracy-making it optimal for industrial power supply manufacturing requiring robust, auto-placed references.
Availability
1N5373/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision analog reference designs requiring stable component supply and full RoHS compliance.
Supply support for 1N5373/TR12 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge immunity, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5373/TR12?
The 1N5373/TR12 has a nominal Zener voltage of 68 V with ±5% tolerance, as indicated by the "B" suffix in its full part number. This means the actual measured VZ falls between 64.6 V and 71.4 V at 20 mA test current and 25 °C lead temperature. The tolerance is guaranteed per JEDEC specification and applies across the full operating temperature range.
Does the 1N5373/TR12 require dry packing before PCB assembly?
No, the 1N5373/TR12 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity Level 1 classification, meaning it can be stored indefinitely at ambient conditions without desiccant or baking. This simplifies inventory handling and eliminates pre-reflow bake steps in manufacturing.
What is the maximum continuous current the 1N5373/TR12 can handle?
The 1N5373/TR12 supports a maximum continuous Zener current (IZM) of 500 mA when operated at 25 °C lead temperature with adequate heat sinking (3/8″ lead length). At higher temperatures, current must be derated linearly per Figure 1 in the datasheet, reaching zero at ~150 °C lead temperature.
Can the 1N5373/TR12 be used in surface-mount designs?
No-the 1N5373/TR12 uses a through-hole axial T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5373B (DO-214AA) and SMBG5373B (DO-214AB), both rated for 5 W but requiring different board layout and thermal pad design.
What is the cathode marking convention for the 1N5373/TR12?
The cathode of the 1N5373/TR12 is identified by a single color band near one end of the cylindrical body. During operation, the banded end must be held at a higher potential than the unbanded (anode) end to achieve reverse-bias Zener conduction. Reversing polarity will forward-bias the diode, producing ~1.2 V drop instead of regulation.
1N5373/TR12 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:
- ±20%
- 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
1N5373/TR12 FAQ
1.How can I place an order for 1N5373/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373/TR12 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 1N5373/TR12 reliable?
The price and inventory of 1N5373/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5373/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373/TR12?
1N5373/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373/TR12 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 1N5373/TR12?
For technical support, including 1N5373/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373/TR12 requirements.
6.How does Aetrix verify that 1N5373/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5373/TR12 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 1N5373/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5373/TR12?
All 1N5373/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373/TR12, 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 1N5373/TR12 part is unused and in its original packaging.
Return procedure for 1N5373/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373/TR12 Tags
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