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Microchip Technology 1N5370/TR8
- Part No.:
- 1N5370/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370/TR8.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,927
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Product details
Overview
1N5370/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 56 V, ±5% tolerance (B suffix), 20 mA test current, 35 Ω dynamic impedance at IZT, and maximum surge current of 280 A (8.3 ms half-sine). 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 1N5370/TR8 datasheet, 1N5370/TR8 pinout, 1N5370/TR8 application, or 1N5370/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage (<0.5 µA at 42.6 V), and RoHS-compliant e3 marking.
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 test current and exhibits low dynamic impedance (35 Ω) and tight regulation (ΔVZ = 2.3 V between 10% and 50% of IZM).
Designed for axial-lead through-hole mounting, it features void-free thermosetting epoxy encapsulation (UL94V-0), tin-lead or matte-tin plating, cathode band polarity marking, and moisture sensitivity level 1-no dry pack required per IPC/JEDEC J-STD-020B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - precise regulation point for 48 V system clamping and reference generation |
| Power Dissipation (PD) | 5.0 W at TL < 25 °C - requires ≥10 mm lead length from body for full rating |
| Test Current (IZT) | 20 mA - standard bias condition for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 35 Ω at IZT - low AC impedance ensures stable regulation under varying load currents |
| Max Surge Current (IZSM) | 280 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Reverse Leakage (IR) | <0.5 µA at 42.6 V - minimal standby power loss in high-impedance bias networks |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design with discrete heat sinking via leads |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-201AD), void-free UL94V-0 epoxy body, cathode indicated by colored band, 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 during regulation; forward VF ≤ 1.2 V @ 1.0 A |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input; maintains 56 V across load when reverse-biased above knee |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter regulation than ±10% or ±20% variants, reducing need for post-regulation trimming |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for immediate PCB assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations during assembly |
| RoHS-compliant e3 marking | Meets EU Directive 2011/65/EU and China RoHS II without lead exemption waivers |
| High surge current rating (280 A) | Provides robust transient immunity in telecom line interfaces and industrial motor drive snubbers |
Applications
| Industrial Power Supply Regulation | Telecom Line Surge Protection |
|---|---|
Use Scenario: Stabilizing auxiliary 56 V rail in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed bias for op-amp comparators and isolated gate drivers. Use Value: Maintains regulation within ±2.3 V across 2–100 mA load range, enabling accurate analog sensing and timing control. | Use Scenario: Clamping induced surges on -48 V DC telecom distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage protector absorbing 8.3 ms lightning-induced transients up to 280 A peak. Use Value: Limits line voltage to ≤56 V during surge, protecting downstream DC-DC converters and monitoring ICs. |
| Automotive Battery Monitoring Reference | Test Equipment Calibration Standard |
Use Scenario: Generating stable 56 V reference for battery management system (BMS) cell stack monitoring in 48 V mild-hybrid vehicles. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC input scaling and fault threshold detection. Use Value: Delivers <0.5 µA leakage at 42.6 V, minimizing current drain on high-impedance divider networks. | Use Scenario: Serving as traceable calibration point in benchtop multimeters and programmable DC loads. IC Role / Device Role / Timing Role: Stable, low-drift Zener element in voltage reference subassemblies. Use Value: Achieves 35 Ω dynamic impedance and ΔVZ = 2.3 V, supporting <0.1% accuracy verification across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B | No TR8 tape-and-reel packaging; bulk or ammo pack only | Lacks automated SMT placement compatibility; suitable for manual or wave-solder assembly | Select 1N5370B when reel packaging is unnecessary and cost-per-unit is prioritized over placement efficiency |
| SMBJ5370B | Surface-mount SMB package (JEDEC DO-214AA); same electrical specs but 125 °C max TJ, higher RθJA (100 °C/W) | Requires PCB layout change; better suited for space-constrained, high-density boards with reflow-only processes | Select SMBJ5370B when board real estate is limited and thermal management permits higher ambient rise |
Compared with 1N5370/TR8, the 1N5370B offers identical regulation performance without tape-and-reel convenience, while SMBJ5370B trades axial-mount flexibility and lower thermal resistance for surface-mount compatibility and reduced footprint-neither is pin-compatible due to differing form factors.
Availability
1N5370/TR8 is available at Aetrix Electronics and suitable for industrial power supply regulation, telecom line surge protection, and automotive battery monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5370/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for high-power, high-stability Zener regulation in harsh-environment applications where thermal robustness, surge immunity, and long-term parametric stability are critical.
FAQ
What is the Zener voltage tolerance for 1N5370/TR8?
The 1N5370/TR8 has a ±5% Zener voltage tolerance, indicated by the "B" suffix in its full designation. This means its measured VZ falls between 53.2 V and 58.8 V at 20 mA and 25 °C. The tolerance is confirmed in the Electrical Characteristics table on page 2 of the Microsemi datasheet, and applies across the full operating temperature range of –65 °C to +150 °C for the 1N5370/TR8.
Does 1N5370/TR8 require dry packing before PCB assembly?
No, the 1N5370/TR8 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has no floor-life limitation and can be assembled directly from reel without baking. This is explicitly stated in the Features section of the Microsemi datasheet and verified in the Mechanical and Packaging section for the T-18 package used by the 1N5370/TR8.
What is the maximum steady-state power dissipation for 1N5370/TR8 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 1N5370/TR8 has a steady-state power rating of 1.47 W at 25 °C ambient. This derated value is derived from its 85 °C/W junction-to-ambient thermal resistance and is documented in the Maximum Ratings section of the Microsemi datasheet for the 1N5370/TR8.
Can 1N5370/TR8 be used in place of 1N5370B in existing designs?
Yes, the 1N5370/TR8 is electrically and mechanically identical to 1N5370B except for packaging: TR8 denotes tape-and-reel (EIA-296 standard), while 1N5370B is typically supplied in bulk or ammo pack. All electrical parameters-including VZ, IZT, ZZ, and IZM-are identical for both versions of the 1N5370/TR8 and 1N5370B.
What is the reverse leakage current specification for 1N5370/TR8?
The reverse leakage current (IR) for 1N5370/TR8 is guaranteed to be less than 0.5 µA when tested at 42.6 V (90% of nominal VZ). This value is specified in the Electrical Characteristics table for all B-suffix devices in the 1N5333B–1N5388B family, including the 1N5370/TR8, and reflects performance at 25 °C with no derating applied.
1N5370/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):
- 56 V
- Tolerance:
- ±20%
- 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
1N5370/TR8 FAQ
1.How can I place an order for 1N5370/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370/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 1N5370/TR8 reliable?
The price and inventory of 1N5370/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5370/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370/TR8?
1N5370/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370/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 1N5370/TR8?
For technical support, including 1N5370/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370/TR8 requirements.
6.How does Aetrix verify that 1N5370/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5370/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 1N5370/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5370/TR8?
All 1N5370/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370/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 1N5370/TR8 part is unused and in its original packaging.
Return procedure for 1N5370/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370/TR8 Tags
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