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Microchip Technology 1N5373B/TR12
- Part No.:
- 1N5373B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373B/TR12.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,679
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Product details
Overview
1N5373B/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 (IZT), 44 Ω maximum dynamic impedance (ZZ), and 0.5 μA maximum 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 1N5373B/TR12 datasheet, 1N5373B/TR12 pinout, 1N5373B/TR12 application, or 1N5373B/TR12 equivalent, key selection criteria include Zener voltage stability under varying load currents, thermal resistance (25 °C/W junction-to-lead), surge current rating (500 A), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output across 10–50% of its maximum Zener current (IZM = 70 mA). Its low dynamic impedance (44 Ω) ensures minimal voltage deviation with current changes, while the 25 °C/W thermal resistance enables reliable operation up to 5 W when lead-temperature is controlled at 25 °C with 3/8″ (10 mm) lead length.
The 1N5373B/TR12 exhibits 2.0 V maximum voltage regulation (ΔVZ) between 10% and 50% IZM, and withstands non-repetitive 8.3 ms half-sine surge currents up to 500 A. Its cathode band marking and void-free UL94V-0 epoxy case support manual and automated through-hole assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% - precise regulation point for 68 V reference circuits |
| Test Current (IZT) | 20 mA - operating point where VZ and ZZ are specified |
| Max Dynamic Impedance (ZZ) | 44 Ω - low AC resistance ensures stable voltage under dynamic load shifts |
| Max Reverse Leakage (IR) | 0.5 μA @ 51.7 V - negligible standby current in high-impedance bias networks |
| Max Zener Current (IZM) | 70 mA - maximum continuous DC current at TL = 25 °C with adequate heatsinking |
| Surge Current (IZSM) | 500 A - peak non-repetitive 8.3 ms half-sine capability for transient suppression |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance enables 5 W dissipation with short leads |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by colored band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse bias applied to cathode |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated rail; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard axial package (T-18) with full JEDEC 1N53xxB compliance |
| ±5% voltage tolerance (B suffix) | Tighter regulation than standard ±10% (A) or ±20% (no suffix) variants |
| Moisture Sensitivity Level 1 | No dry pack required; safe for standard SMT/reflow handling prior to assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special ESD handling needed |
| RoHS compliant (e3 suffix) | Matte-tin plating meets EU RoHS Directive 2011/65/EU requirements |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback reference in 68 V switched-mode power supply secondary-side error amplifiers. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing stable bias to optocoupler or TL431 input. Use Value: Maintains ±0.34 V regulation window (ΔVZ = 2.0 V) across 7–35 mA load variation, enabling tight output voltage control. |
Use Scenario: Clamping transient spikes on 48 V DC bus lines in motor drive inverters. IC Role / Device Role / Timing Role: Shunt protector diverting surge energy above 68 V to ground during IGBT switching events. Use Value: Withstands 500 A 8.3 ms surges without degradation, protecting downstream MOSFET gate drivers and controllers. |
| Programmable Reference Source | Temperature-Stable Bias Network |
|
Use Scenario: Generating fixed 68 V reference for analog-to-digital converter (ADC) input scaling in data acquisition modules. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost IC references where moderate tempco suffices. Use Value: Delivers 68 V ±5% over –65°C to +150°C with <0.1%/°C typical tempco, reducing calibration burden. |
Use Scenario: Establishing stable bias current for high-voltage op-amp input stages in telecom line interface cards. IC Role / Device Role / Timing Role: Low-noise, low-drift current source element in constant-current generator circuits. Use Value: 44 Ω dynamic impedance minimizes current variation with supply ripple, improving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B (bulk) | Identical electrical specs; differs only in packaging (TR12 = tape-and-reel, bulk has no reel) | No functional difference; TR12 supports automated pick-and-place, bulk suits hand-solder prototyping | Select 1N5373B/TR12 for SMT production; choose bulk for lab evaluation or low-volume assembly |
| MMBZ5268B (SOT-23) | Same 68 V ±5%, but 0.5 W rating, 100 mA IZM, surface-mount package, higher ZZ (100 Ω) | Not suitable for 5 W continuous dissipation; limited to low-power bias/reference roles | Use MMBZ5268B only where space-constrained PCB layout prohibits axial T-18; verify thermal derating |
Compared with 1N5373B/TR12, the bulk version offers identical performance with manual handling convenience, while MMBZ5268B trades power capability and thermal robustness for miniaturization-making it unsuitable as a drop-in replacement in high-power regulation.
Availability
1N5373B/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, programmable reference sources, and temperature-stable bias networks requiring stable component supply and long-term obsolescence management.
Supply support for 1N5373B/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 discrete components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed as a ruggedized, JEDEC-standard 5 W Zener platform supporting military-grade screening (JAN/JANTX), wide temperature operation, and surge resilience in mission-critical power systems.
FAQ
What is the Zener voltage tolerance of the 1N5373B/TR12?
The 1N5373B/TR12 has a nominal Zener voltage of 68 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance applies across the full operating temperature range of –65°C to +150°C and is verified at 20 mA test current (IZT) with lead temperature maintained at 25°C.
Can the 1N5373B/TR12 be used in surface-mount designs?
No-the 1N5373B/TR12 is an axial-leaded T-18 package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5373B or SMBG5373B in DO-214AA/DO-214AB packages, which share the same 68 V ±5% regulation but differ in thermal performance and surge ratings.
What is the maximum continuous power dissipation for the 1N5373B/TR12?
The 1N5373B/TR12 is rated for 5.0 W steady-state power dissipation at 25°C lead temperature (TL), with linear derating above that point. When mounted on FR4 with 1 oz copper and specified pad geometry, its power rating drops to 1.47 W at 25°C ambient (TA), due to higher junction-to-ambient thermal resistance (85 °C/W).
Does the 1N5373B/TR12 require dry packing for moisture sensitivity?
No-the 1N5373B/TR12 has IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1, meaning it is not moisture-sensitive and does not require dry pack or baking prior to soldering. Its void-free thermosetting epoxy body inherently prevents moisture ingress during reflow or wave soldering.
How is polarity marked on the 1N5373B/TR12?
The 1N5373B/TR12 uses a cathode band (colored stripe) to indicate polarity. The banded end is the cathode and must be held at a higher potential than the anode to operate in Zener breakdown mode. Forward voltage is guaranteed ≤1.2 V at 1.0 A, confirming standard silicon diode behavior in forward bias.
1N5373B/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:
- ±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
1N5373B/TR12 FAQ
1.How can I place an order for 1N5373B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373B/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 1N5373B/TR12 reliable?
The price and inventory of 1N5373B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5373B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373B/TR12?
1N5373B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373B/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 1N5373B/TR12?
For technical support, including 1N5373B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373B/TR12 requirements.
6.How does Aetrix verify that 1N5373B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5373B/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 1N5373B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5373B/TR12?
All 1N5373B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373B/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 1N5373B/TR12 part is unused and in its original packaging.
Return procedure for 1N5373B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373B/TR12 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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