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Microchip Technology 1N5370E3/TR8
- Part No.:
- 1N5370E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370E3/TR8.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,451
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Product details
Overview
1N5370E3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 56 V, ±5% tolerance (B-suffix equivalent), 20 mA test current, 35 Ω dynamic impedance at IZT, and maximum reverse leakage of 0.5 μA at 42.6 V. 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 1N5370E3/TR8 datasheet, 1N5370E3/TR8 pinout, 1N5370E3/TR8 application, or 1N5370E3/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (280 A), voltage regulation (ΔVZ = 1.00 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, maintaining stable output across wide current (20 mA to 280 mA) and temperature (–65 °C to +150 °C) ranges. Its low dynamic impedance (35 Ω) and tight voltage regulation (1.00 V ΔVZ) ensure minimal output drift under load variation.
Designed for axial-lead through-hole mounting on FR4 PCBs with 4 mm² copper pads, it delivers 5 W steady-state power at lead temperature < 25 °C (3/8″ from body), derating linearly above that point. The cathode band polarity marking and UL94V-0 void-free epoxy case support reliable manual and automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - precise regulation point for 52.2–59.8 V operation |
| Test Current (IZT) | 20 mA - standardized bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 35 Ω - low AC resistance ensures stable voltage under varying load currents |
| Max Reverse Leakage (IR) | 0.5 μA @ 42.6 V - ultra-low off-state current minimizes standby power loss |
| Surge Current (IZSM) | 280 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables high continuous power dissipation with minimal heatsinking |
| Operating Temperature | –65 °C to +150 °C - suitable for harsh industrial and automotive under-hood environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (UL94V-0 epoxy), cathode indicated by color band; leads are RoHS-compliant annealed matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased terminal during regulation | Connected to lower-potential node; carries full Zener current when regulating |
| Cathode | Regulated output terminal | Banded end; referenced to system ground or return path; defines regulated voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Guarantees mechanical and electrical interchangeability across 1N53xxB series |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU with matte-tin plating and lead-free assembly compatibility |
| Moisture sensitivity Level 1 | No dry-pack required; safe for standard SMT/reflow handling without baking |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special ESD controls needed during assembly |
| High surge current capability | 280 A peak (8.3 ms) supports robust transient suppression in power rails |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback reference in isolated DC-DC converters delivering 48–60 V output. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing stable 56 V threshold for error amplifier input. Use Value: Maintains ±0.5% output regulation over 10–100% load step due to 35 Ω ZZ and 1.00 V ΔVZ. |
Use Scenario: Clamping transient spikes on 48 V telecom battery backup lines. IC Role / Device Role / Timing Role: Shunt protector diverting surge energy above 59.8 V to ground before downstream IC damage. Use Value: Survives 280 A surges (8.3 ms) without parametric shift, verified per JEDEC JESD22-A114. |
| Programmable Voltage Reference | Temperature-Stable Bias Generator |
Use Scenario: Setting precise bias points in analog sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Fixed-voltage reference source for op-amp offset nulling and gain calibration. Use Value: Delivers 56 V ±5% across –40 °C to +85 °C, enabling <10 ppm/°C drift compensation. |
Use Scenario: Generating stable gate drive thresholds for high-side MOSFETs in motor control inverters. IC Role / Device Role / Timing Role: Temperature-compensated Zener reference establishing fixed turn-on voltage for driver ICs. Use Value: Low 25 °C/W RθJL and –65 °C to +150 °C range ensure consistent turn-on behavior under thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B | Same 56 V ±5%, but non-RoHS tin-lead plating; identical electrical specs and package | Not compliant with EU RoHS or China RoHS; unsuitable for export to regulated markets | Select 1N5370E3/TR8 for new designs requiring lead-free compliance and tape-and-reel delivery. |
| SMBJ5370B | Surface-mount SMB package; same 56 V ±5% and 5 W rating; higher thermal resistance (85 °C/W) | Requires PCB rework for SMT placement; less effective heat dissipation without large copper pour | Choose SMBJ5370B only when board space constraints prohibit axial-leaded components. |
Compared with 1N5370B and SMBJ5370B, the 1N5370E3/TR8 uniquely combines RoHS compliance, axial-lead mechanical robustness, and optimal thermal performance (25 °C/W) for through-hole power regulation-making it ideal for industrial power supply redesigns requiring long-term component availability and regulatory alignment.
Availability
1N5370E3/TR8 is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection circuits, programmable voltage references, and temperature-stable bias generators requiring stable component supply and full RoHS compliance.
Supply support for 1N5370E3/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 Zener series was engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal stability, surge survivability, and long-term parametric consistency under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5370E3/TR8?
The 1N5370E3/TR8 has a ±5% Zener voltage tolerance, confirmed by its "B" suffix in the base part number (1N5370B) and documented in Microsemi's REV D datasheet. This yields a guaranteed regulation range of 52.2 V to 59.8 V at 20 mA test current and 25 °C lead temperature. The e3 suffix adds RoHS compliance but does not alter voltage tolerance.
Does the 1N5370E3/TR8 require dry packing before PCB assembly?
No, the 1N5370E3/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity Level 1, meaning it may be stored and assembled without dry packing or baking. Its void-free thermosetting epoxy case and matte-tin plating meet MIL-STD-750 requirements for solderability and humidity resistance out-of-box.
What is the maximum continuous power dissipation for the 1N5370E3/TR8?
The 1N5370E3/TR8 is rated for 5.0 W steady-state power dissipation at 25 °C lead temperature (3/8″ from body). When mounted on FR4 with 1 oz copper and specified pad geometry, its derated power drops to 1.47 W at 25 °C ambient, per Figure 1 in the official datasheet.
How is polarity marked on the 1N5370E3/TR8?
The 1N5370E3/TR8 uses a cathode band marking: the banded end is the cathode and must be held at a higher potential than the anode to operate in Zener breakdown. This polarity is critical for correct voltage reference orientation and overvoltage clamping function in circuit design.
What surge current rating does the 1N5370E3/TR8 support?
The 1N5370E3/TR8 supports 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 is validated per JEDEC standards and enables reliable transient suppression in 48 V telecom and industrial power bus applications.
1N5370E3/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
1N5370E3/TR8 FAQ
1.How can I place an order for 1N5370E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370E3/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 1N5370E3/TR8 reliable?
The price and inventory of 1N5370E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370E3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5370E3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370E3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370E3/TR8?
1N5370E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370E3/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 1N5370E3/TR8?
For technical support, including 1N5370E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370E3/TR8 requirements.
6.How does Aetrix verify that 1N5370E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5370E3/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 1N5370E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5370E3/TR8?
All 1N5370E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370E3/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 1N5370E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5370E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370E3/TR8 Tags
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