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Microchip Technology 1N5370C/TR12
- Part No.:
- 1N5370C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370C/TR12.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,932
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Product details
Overview
1N5370C/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 56 V, ±2% tolerance (C suffix), 20 mA test current, 35 Ω maximum dynamic impedance at IZT, and 280 A peak surge current rating. 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 1N5370C/TR12 datasheet, 1N5370C/TR12 pinout, 1N5370C/TR12 application, or 1N5370C/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power derating, reverse leakage at VR = 42.6 V, and compliance with MIL-PRF-19500 screening options.
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 (IZT), and its regulation stability relies on low dynamic impedance (ZZ = 35 Ω) and minimal voltage variation (ΔVZ = 1.00 V) between 10% and 50% of maximum Zener current.
The 1N5370C/TR12 uses a void-free thermosetting epoxy T-18 package with tin-lead or RoHS-compliant matte-tin plating. Cathode polarity is marked by a band; operation requires the banded end to be positive relative to the anode. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±2% - precise regulation point at 20 mA, enabling stable reference in feedback loops. |
| Power Dissipation (Pd) | 5.0 W at TL < 25°C (3/8″ lead length) - defines maximum continuous power under ideal heatsinking. |
| Dynamic Impedance (ZZ) | 35 Ω max at IZT = 20 mA - low AC impedance ensures minimal output voltage variation under load transients. |
| Reverse Leakage (IR) | 0.5 μA max at VR = 42.6 V - guarantees high impedance blocking below regulation threshold. |
| Surge Current (IZSM) | 280 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure. |
| Thermal Resistance | 25 °C/W junction-to-lead - enables accurate thermal design when mounted with 10 mm lead length from body. |
| Voltage Regulation (ΔVZ) | 1.00 V max - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity. |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC TO-204AA; void-free UL94V-0 epoxy body; cathode indicated by band; leads solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation; must be negative relative to cathode. |
| Cathode | Zener breakdown terminal / regulation output | Banded end; connected to higher-potential node; provides stable 56 V reference when reverse-biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter closed-loop regulation than ±5% (B) or ±10% (A) variants, reducing need for external trimming. |
| JEDEC-registered 1N53xx series | Guarantees mechanical and electrical interchangeability across qualified manufacturers and supply chains. |
| MIL-PRF-19500 screening options | Supports JAN, JANTX, JANTXV qualification via MQ/MX/MV prefixes - critical for aerospace and defense designs. |
| RoHS-compliant e3 variant available | Meets environmental compliance without performance trade-off; tin plating ensures solderability and corrosion resistance. |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly - reduces manufacturing overhead and risk of popcorning. |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp in Telecom Line Cards |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision 56 V reference for TL431-like shunt regulator circuits or direct feedback to PWM controller. Use Value: ±2% tolerance ensures output stays within ±1% system spec without calibration; 5 W rating handles burst-mode transients. | Use Scenario: Protecting downstream circuitry from lightning-induced surges on -48 V DC distribution lines. IC Role / Device Role / Timing Role: Primary clamping element placed across input rails before DC/DC converter input stage. Use Value: 280 A surge rating absorbs 10/700 µs telecom surge waveforms; low ΔVZ maintains clamp consistency during multi-pulse events. |
| Programmable Voltage Reference Module | Automotive Battery Monitoring Interface |
Use Scenario: Building adjustable reference sources using resistor dividers and op-amp buffers. IC Role / Device Role / Timing Role: Stable Zener source for DAC output scaling or ADC reference conditioning. Use Value: Low ZZ (35 Ω) minimizes divider loading error; wide temperature range (–65°C to +150°C) supports extended industrial environments. | Use Scenario: Detecting overcharge conditions in 48 V mild-hybrid battery systems. IC Role / Device Role / Timing Role: Threshold detector in comparator-based monitoring circuit tied to battery rail. Use Value: Tight 56 V tolerance aligns precisely with 12S Li-ion stack overvoltage limit (56.4 V); low IR ensures negligible standby current drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B/TR12 | Same 56 V nominal VZ but ±5% tolerance; otherwise identical electrical and thermal specs. | Suitable where cost sensitivity outweighs tight regulation; may require system-level calibration. | Select when ±5% regulation window is acceptable and B-suffix stock is more readily available. |
| MMBZ5255B (SOT-23) | Surface-mount, 0.5 W rating, 56 V ±5%, 100 Ω ZZ - not a drop-in replacement. | Limited to low-power signal-level references; cannot handle 5 W dissipation or 280 A surge. | Choose only for space-constrained PCBs where power and surge requirements are significantly lower. |
Compared with 1N5370B/TR12, the 1N5370C/TR12 delivers tighter regulation (±2% vs. ±5%) without changing thermal design or layout; versus MMBZ5255B, it provides 10× higher power handling and robust surge immunity but requires axial through-hole mounting.
Availability
1N5370C/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, programmable reference modules, and automotive battery monitoring requiring stable component supply and long-term obsolescence management.
Supply support for 1N5370C/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized, high-stability voltage regulation in harsh-environment power systems where long-term parametric drift and surge resilience are critical.
FAQ
What is the Zener voltage tolerance of the 1N5370C/TR12?
The 1N5370C/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix. This means its actual regulation voltage falls between 54.88 V and 57.12 V at 20 mA test current and 25 °C. This tighter tolerance supports precision feedback and reference applications without external trimming, distinguishing it from the ±5% 1N5370B/TR12 or ±10% 1N5370A/TR12 variants.
Does the 1N5370C/TR12 require dry packing before PCB assembly?
No, the 1N5370C/TR12 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity level (MSL) 1, meaning it is non-hygroscopic and can be stored and assembled without baking or humidity-controlled packaging. This simplifies logistics and eliminates popcorning risk during reflow, unlike higher-MSL discrete components.
What is the maximum surge current rating for the 1N5370C/TR12?
The 1N5370C/TR12 is rated for a peak non-recurrent surge current (IZSM) of 280 A, defined as the maximum amplitude of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy in overvoltage protection circuits, such as telecom line clamping or industrial power rail suppression, without degradation or failure.
Can the 1N5370C/TR12 be used in place of the 1N5370B/TR12?
Yes, the 1N5370C/TR12 is a direct functional replacement for the 1N5370B/TR12 in most applications, sharing identical package (T-18), thermal characteristics, power rating (5 W), and Zener voltage nominal (56 V). The only difference is tighter ±2% tolerance versus ±5%, which improves regulation accuracy without requiring layout or thermal redesign.
What is the reverse leakage current specification for the 1N5370C/TR12?
The 1N5370C/TR12 specifies a maximum reverse leakage current (IR) of 0.5 μA at a reverse test voltage (VR) of 42.6 V - which is 75% of its nominal 56 V Zener voltage. This ultra-low leakage ensures minimal standby power loss and high impedance blocking in reference and protection circuits, especially at elevated temperatures.
1N5370C/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):
- 56 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 40.3 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
1N5370C/TR12 FAQ
1.How can I place an order for 1N5370C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370C/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 1N5370C/TR12 reliable?
The price and inventory of 1N5370C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5370C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370C/TR12?
1N5370C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370C/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 1N5370C/TR12?
For technical support, including 1N5370C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370C/TR12 requirements.
6.How does Aetrix verify that 1N5370C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5370C/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 1N5370C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5370C/TR12?
All 1N5370C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370C/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 1N5370C/TR12 part is unused and in its original packaging.
Return procedure for 1N5370C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370C/TR12 Tags
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