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Microchip Technology 1N5372B/TR12
- Part No.:
- 1N5372B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5372B/TR12.pdf
- Description:
- DIODE ZENER 62V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,212
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Product details
Overview
1N5372B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 62 V, ±5% tolerance, 20 mA test current, 42 Ω maximum dynamic impedance at IZT, and 400 A peak surge current capability. 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 1N5372B/TR12 datasheet, 1N5372B/TR12 pinout, 1N5372B/TR12 application, or 1N5372B/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25°C), reverse leakage (<0.5 µA at 47.1 V), and RoHS-compliant matte-tin plating.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown. Its Zener voltage is specified at 25°C with 20 mA DC test current and exhibits low voltage regulation drift (ΔVZ = 2.1 V) between 10% and 50% of IZM. The 25 °C/W junction-to-lead thermal resistance enables stable operation under high-current conditions when mounted with ≥10 mm lead length from body.
It features a void-free UL94V-0 epoxy case, cathode band polarity marking, and meets MIL-STD-750 Method 1020 for ESD insensitivity. The 0.7 g weight and T-18 package support manual and automated axial-leaded assembly on FR4 PCBs with 1 oz copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62 V ±5% - precise regulation point for 47–76 V input rails |
| Power Dissipation (PD) | 5.0 W at TL < 25°C - requires minimum 10 mm lead length for full rating |
| Test Current (IZT) | 20 mA - standard bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 42 Ω max at IZT - ensures minimal output voltage shift under load transients |
| Surge Current (IZSM) | 400 A (8.3 ms half-sine) - withstands lightning-induced or switching-induced transients |
| Reverse Leakage (IR) | <0.5 µA at 47.1 V - negligible standby current in high-impedance reference circuits |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables direct heatsinking via leads without PCB copper pour |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-201AD; moisture sensitivity level 1 (no dry pack required); RoHS-compliant matte-tin plated leads; cathode identified by single black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to system ground or lower-potential node; forms reference return path |
| Cathode | Zener breakdown terminal / regulation output | Banded end; connected to unregulated rail; delivers stable 62 V to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter regulation than ±10% (A) or ±20% (no suffix) variants without premium cost |
| 25 °C/W junction-to-lead thermal resistance | Allows full 5 W dissipation with simple lead bending/heat sinking-no PCB copper area needed |
| 400 A non-recurrent surge rating (8.3 ms) | Eliminates need for external TVS in many industrial 24/48 V supply protection schemes |
| Moisture Level 1 per J-STD-020B | Supports standard SMT reflow and wave soldering without baking or dry pack handling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates ESD-safe workstation requirements during assembly |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for 48 V Telecom Systems |
|---|---|
Use Scenario: Providing stable 62 V reference for feedback loop of isolated DC-DC converter in DIN-rail power supply. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing precise error amplifier reference voltage. Use Value: Maintains ±0.5% output regulation across –40°C to +85°C ambient due to low ΔVZ (2.1 V) and tight 5% VZ tolerance. | Use Scenario: Clamping transient surges on 48 V backplane in telecom shelf management unit. IC Role / Device Role / Timing Role: Passive overvoltage protector diverting >62 V energy to ground before downstream IC damage. Use Value: Withstands 400 A 8.3 ms surges without degradation-replaces discrete MOV+TVS stacks in space-constrained modules. |
| Programmable Logic Controller Input Protection | High-Voltage Sensor Biasing |
Use Scenario: Protecting 24 V digital input channel against accidental 120 VAC cross-wiring in PLC field terminals. IC Role / Device Role / Timing Role: Fail-safe shunt limiter clamping input voltage to safe level for optocoupler interface IC. Use Value: Low 0.5 µA leakage at 47.1 V prevents false triggering; robust epoxy case resists industrial contaminants. | Use Scenario: Biasing avalanche photodiode (APD) requiring stable 62 V reverse bias in optical sensing module. IC Role / Device Role / Timing Role: Precision DC bias source delivering low-noise, low-drift voltage to APD cathode. Use Value: 42 Ω dynamic impedance minimizes bias voltage ripple under varying photocurrent loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5372B (bulk) | Identical electrical specs; differs only in packaging (tape-and-reel TR12 vs. bulk) | No functional difference; TR12 enables automated pick-and-place; bulk suits hand-solder prototyping | Select 1N5372B/TR12 for SMT production; choose bulk for lab validation or low-volume repair |
| MMBZ5255B (SOT-23) | Same 62 V ±5%, but 0.5 W rating, 100 mA IZM, surface-mount package | Not suitable for 5 W continuous dissipation; limited to low-power bias/reference roles | Use MMBZ5255B only where board space is critical and power <0.3 W; retain 1N5372B/TR12 for >1 W regulation |
Compared with 1N5372B (bulk) and MMBZ5255B, the 1N5372B/TR12 offers identical regulation performance with tape-and-reel compatibility for high-volume manufacturing, while its 5 W rating and axial T-18 package provide superior thermal handling versus SOT-23 alternatives in power-critical designs.
Availability
1N5372B/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, and programmable logic controller input conditioning requiring stable component supply and long-term obsolescence management.
Supply support for 1N5372B/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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal stability, surge resilience, and long-lifecycle availability over consumer-grade alternatives.
FAQ
What is the Zener voltage tolerance of the 1N5372B/TR12?
The 1N5372B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its measured breakdown voltage at 20 mA test current falls within 59.0 V to 65.0 V at 25°C. This tolerance is tighter than the ±10% option (A suffix) and supports more accurate voltage referencing in feedback networks without requiring post-calibration trimming.
Can the 1N5372B/TR12 be used in surface-mount designs?
No, the 1N5372B/TR12 uses an axial-leaded T-18 package and is not a surface-mount device. For SMT equivalents, Microsemi offers the SMBJ5372B in SMB package or SMBG5372B in SMBG variant-both share identical electrical specs but require different PCB footprints and reflow profiles. The 1N5372B/TR12 must be mounted through-hole with ≥10 mm lead length for full 5 W rating.
What is the maximum steady-state power dissipation of the 1N5372B/TR12 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5372B/TR12 has a steady-state power rating of 1.47 W at 25°C ambient. This derated value reflects its 85°C/W junction-to-ambient thermal resistance under those conditions-significantly lower than its 5 W rating achievable with proper lead heat sinking.
Does the 1N5372B/TR12 meet RoHS requirements?
Yes, the 1N5372B/TR12 is RoHS compliant, as confirmed by the "e3" suffix in Microsemi's official documentation. Its leads feature annealed matte-tin plating per MIL-STD-750 Method 2026, and the void-free thermosetting epoxy body meets UL94V-0 flammability standards-ensuring compliance with EU Directive 2011/65/EU and related global environmental regulations.
How does the 1N5372B/TR12 handle transient overvoltage events?
The 1N5372B/TR12 is rated for 400 A peak non-recurrent surge current (8.3 ms half-sine waveform), making it suitable for clamping lightning-induced or inductive-switching transients in industrial 48 V systems. Its low 2.1 V voltage regulation (ΔVZ) ensures minimal overshoot during clamping, and its robust epoxy case maintains integrity after repeated surge exposure without parameter drift.
1N5372B/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):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 42 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 44.6 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
1N5372B/TR12 FAQ
1.How can I place an order for 1N5372B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5372B/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 1N5372B/TR12 reliable?
The price and inventory of 1N5372B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5372B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5372B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5372B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5372B/TR12?
1N5372B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5372B/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 1N5372B/TR12?
For technical support, including 1N5372B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5372B/TR12 requirements.
6.How does Aetrix verify that 1N5372B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5372B/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 1N5372B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5372B/TR12?
All 1N5372B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5372B/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 1N5372B/TR12 part is unused and in its original packaging.
Return procedure for 1N5372B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5372B/TR12 Tags
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