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Microchip Technology 1N5370C/TR8
- Part No.:
- 1N5370C/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370C/TR8.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,078
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Product details
Overview
1N5370C/TR8 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/TR8 datasheet, 1N5370C/TR8 pinout, 1N5370C/TR8 application, or 1N5370C/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power derating, reverse leakage at VR = 45.2 V, and compliance with MIL-PRF-19500 screening options.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its regulation performance is defined by VZ = 56 V at IZT = 20 mA, with ΔVZ ≤ 2.3 V between 10% and 50% of IZM, and ZZK ≤ 44 Ω at 1 mA knee current.
The 1N5370C/TR8 uses a void-free thermosetting epoxy T-18 package with tin-lead or RoHS-compliant matte-tin plating. Polarity is marked by cathode band; operation requires cathode positive relative to 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% at 20 mA - ensures stable reference within tight tolerance for feedback loops |
| Power Dissipation | 5.0 W at TL = 25 °C (3/8″ lead length) - defines maximum continuous DC power with adequate heatsinking |
| Dynamic Impedance (ZZ) | 35 Ω max at IZT = 20 mA - low impedance maintains regulation under load transients |
| Reverse Leakage (IR) | 0.5 μA max at VR = 45.2 V - minimal off-state current preserves efficiency in standby |
| Surge Current (IZSM) | 280 A peak (8.3 ms half-sine) - withstands lightning-induced or switching surges |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design using lead conduction path |
| Operating Temperature | –65 °C to +150 °C - supports deployment in harsh industrial and aerospace environments |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC TO-204-AD. Void-free UL94V-0 epoxy body; cathode indicated by colored band; leads solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; connected to voltage source input; maintains 56 V relative to anode under breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables high-accuracy voltage references without external trimming in feedback networks |
| JEDEC-registered 1N53xx series | Guarantees mechanical and electrical interchangeability across qualified suppliers |
| MIL-PRF-19500 screening option | Supports JAN, JANTX, JANTXV qualification via MQ/MX/MV prefixes for defense applications |
| RoHS-compliant e3 variant | Meets environmental compliance without performance trade-off; tin plating ensures solderability |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints during assembly |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier setpoint. Use Value: ±2% VZ tolerance directly reduces output voltage drift across line/load/temperature. | Use Scenario: Shunts excess energy during transient overvoltage events on 48 V telecom rails. IC Role / Device Role / Timing Role: Two-terminal crowbar element clamping voltage before downstream IC damage. Use Value: 280 A surge rating absorbs 8.3 ms transients without degradation per IEC 61000-4-5. |
| Industrial Sensor Excitation | Programmable Logic Controller Input Conditioning |
Use Scenario: Provides stable 56 V excitation for piezoresistive pressure sensors in hydraulic control systems. IC Role / Device Role / Timing Role: Fixed-voltage bias source maintaining sensor bridge linearity. Use Value: Low ΔVZ (≤2.3 V) ensures excitation stability despite supply ripple up to ±10%. | Use Scenario: Protects 24 V digital input circuits from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Front-end clamp limiting input voltage to safe levels for Schmitt-trigger receivers. Use Value: 5 W power rating sustains repeated 100 V/100 ms transients without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B/TR8 | ±5% VZ tolerance; otherwise identical electrical specs and package | Acceptable where tighter regulation not required; lower cost | Select when system-level calibration compensates for wider tolerance |
| MMBZ5255B-TP | Surface-mount SOT-23; 56 V ±5%; 0.225 W rating; ZZ = 130 Ω | Not suitable for 5 W power handling; limited to low-current biasing | Choose only for space-constrained PCBs with <50 mA regulation needs |
Compared with 1N5370B/TR8, the 1N5370C/TR8 offers improved voltage accuracy critical for closed-loop regulation, while MMBZ5255B-TP trades power capability for miniaturization - neither is pin-compatible, and both require layout changes.
Availability
1N5370C/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, sensor excitation circuits, and PLC input conditioning requiring stable component supply and long-term obsolescence management.
Supply support for 1N5370C/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 1N53xx series was designed specifically for robust, high-power voltage regulation in mission-critical power systems where thermal stability, surge resilience, and long-term parametric consistency are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5370C/TR8?
The 1N5370C/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix per Microsemi's documentation. This means its regulated voltage falls within 54.88 V to 57.12 V at 20 mA test current and 25 °C lead temperature. The tolerance is tighter than the ±5% of the "B" variant and enables higher-precision feedback in power converter designs.
Does the 1N5370C/TR8 require dry packing before PCB assembly?
No, the 1N5370C/TR8 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 indefinitely at ambient conditions without baking or humidity-controlled packaging prior to reflow soldering.
What is the maximum surge current rating for the 1N5370C/TR8?
The 1N5370C/TR8 is rated for a peak non-repetitive surge current (IZSM) of 280 A, specified as a single 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without parametric shift or failure, making it suitable for IEC 61000-4-5 compliant overvoltage protection circuits.
Can the 1N5370C/TR8 be used in surface-mount designs?
No, the 1N5370C/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5370B series (DO-214AA) and SMBG5370B series (DO-214AB), which share the same 56 V Zener voltage but differ in package, power rating, and thermal characteristics.
What is the forward voltage drop of the 1N5370C/TR8 at 1.0 A?
The forward voltage drop of the 1N5370C/TR8 is specified as a maximum of 1.2 V at 1.0 A forward current and 25 °C. This value applies only in forward conduction mode and is relevant for polarity protection or reverse-bias blocking verification, not for normal Zener regulation operation.
1N5370C/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N5370C/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370C/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 1N5370C/TR8 reliable?
The price and inventory of 1N5370C/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370C/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5370C/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370C/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370C/TR8?
1N5370C/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370C/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 1N5370C/TR8?
For technical support, including 1N5370C/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370C/TR8 requirements.
6.How does Aetrix verify that 1N5370C/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5370C/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 1N5370C/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5370C/TR8?
All 1N5370C/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370C/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 1N5370C/TR8 part is unused and in its original packaging.
Return procedure for 1N5370C/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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