My Inquiry
My Account
Microchip Technology 1N5370CE3/TR12
- Part No.:
- 1N5370CE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370CE3/TR12.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,369
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5370CE3/TR12 from Microsemi is a 56 V, ±2% tolerance, 5 W axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation across -65°C to +150°C with 25 °C/W junction-to-lead thermal resistance and supports up to 280 A surge current (8.3 ms half-sine).
For engineers reviewing the 1N5370CE3/TR12 datasheet, 1N5370CE3/TR12 pinout, 1N5370CE3/TR12 application, or 1N5370CE3/TR12 equivalent, key selection criteria include its tight ±2% Zener voltage tolerance (C suffix), 56 V nominal regulation at 20 mA test current, low 86 Ω dynamic impedance at IZT, 0.5 μA maximum reverse leakage at 42.6 V, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This Zener operates in reverse breakdown mode with cathode-banded polarity, requiring the banded end to be held positive relative to the anode. Its regulation performance is specified at TL = 25°C with 40 ±10 ms DC current application, and voltage regulation (ΔVZ) is defined as the difference between measurements at 10% and 50% of IZM.
Thermal design relies on lead-length-dependent junction-to-lead resistance (25 °C/W at 3/8" lead length) rather than ambient-based derating; when mounted on FR4 with 4 mm² copper pads, junction-to-ambient resistance rises to 85 °C/W, limiting steady-state power to 1.47 W at TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±2% - precise reference for feedback networks requiring tight output tolerance |
| Test Current (IZT) | 20 mA - operating point where VZ and ZZ are guaranteed; sets minimum bias for stable regulation |
| Dynamic Impedance (ZZ) | 86 Ω max at IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Max Reverse Current (IR) | 0.5 μA at 42.6 V - ultra-low leakage preserves accuracy in high-impedance reference paths |
| Max Surge Current (IZSM) | 280 A (8.3 ms half-sine) - withstands repetitive line surges without degradation |
| Power Dissipation | 5.0 W at TL < 25°C (3/8" lead length) - requires mechanical heat sinking via leads, not PCB copper alone |
| Voltage Regulation (ΔVZ) | 2.3 V max - difference between VZ measured at 10% and 50% of IZM defines regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band, RoHS-compliant matte-tin plated leads per MIL-STD-750 Method 2026, weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-biased operation requires this terminal to be at lower potential than cathode |
| Cathode (banded end) | Regulated output node | Provides stable 56 V reference when reverse biased; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables single-resistor feedback designs in 56 V SMPS without trimming or calibration |
| JEDEC-registered 1N53xxB series | Guarantees standardized electrical behavior and interchangeability across qualified suppliers |
| Moisture sensitivity Level 1 (IPC/JEDEC J-STD-020B) | Eliminates dry-pack requirement and floor-life constraints for SMT reflow compatibility |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions during manual assembly and board-level testing |
| 5 W power rating with 25 °C/W junction-to-lead Rθ | Supports high-current regulation when leads are clamped to heatsinks or chassis ground |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating 56 V output in isolated flyback converter using TL431-like topology with optocoupler feedback. IC Role / Device Role / Timing Role: Primary-side Zener reference replacing TL431 in cost-sensitive, non-isolated auxiliary supplies. Use Value: Delivers 56 V ±2% regulation at 20 mA with 86 Ω dynamic impedance, minimizing output ripple under line/load transients. | Use Scenario: Clamping 56 V rail against transient spikes in industrial motor drive DC bus monitoring. IC Role / Device Role / Timing Role: Passive overvoltage protector shunting excess energy to ground during IGBT switching events. Use Value: Withstands 280 A surge (8.3 ms) without parametric shift, ensuring long-term reliability in harsh EMI environments. |
| Programmable Reference Voltage Source | Temperature-Stable Bias Generator |
Use Scenario: Generating precision 56 V reference for ADC front-end scaling in battery management systems. IC Role / Device Role / Timing Role: High-stability voltage source feeding resistive divider network into instrumentation amplifier input. Use Value: Maintains ±2% tolerance from -65°C to +150°C with <0.5 μA leakage at 42.6 V, preserving measurement accuracy. | Use Scenario: Providing temperature-compensated bias current for Class AB audio amplifier output stage. IC Role / Device Role / Timing Role: Zener-based current source establishing quiescent operating point independent of supply drift. Use Value: Low ΔVZ (2.3 V) ensures consistent bias current across 10–50% of IZM range, reducing thermal runaway risk. |
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 nominal, but ±5% tolerance (B suffix) vs. ±2% (C suffix); otherwise identical electrical specs | Acceptable where 5% output tolerance is sufficient; lower cost for non-critical rails | Select 1N5370B only if system-level testing confirms 5% VZ variation does not impact regulation stability |
| MMSZ5255B-TP | Surface-mount SOD-123 package, 56 V ±5%, 500 mW rating - not power-compatible with 5 W requirement | Only suitable for low-power signal-level references; cannot replace 1N5370CE3/TR12 in power regulation roles | Use MMSZ5255B-TP only in space-constrained, low-current (<10 mA) reference applications where thermal mass is not required |
Compared with 1N5370B and MMSZ5255B-TP, the 1N5370CE3/TR12 uniquely combines ±2% tolerance, 5 W dissipation capability, axial-leaded mechanical robustness, and surge immunity-making it irreplaceable in high-reliability 56 V power regulation where precision and ruggedness coexist.
Availability
1N5370CE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable reference voltage sources requiring stable component supply across extended temperature ranges and high-surge environments.
Supply support for 1N5370CE3/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 applications.
The 1N53xxB series was designed specifically for ruggedized voltage regulation in mission-critical power systems where long-term stability, surge resilience, and wide-temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5370CE3/TR12?
The 1N5370CE3/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. 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 tighter tolerance enables higher accuracy in feedback loops without external trimming, distinguishing it from the ±5% 1N5370B variant.
How is thermal management handled for the 1N5370CE3/TR12?
The 1N5370CE3/TR12 relies on junction-to-lead thermal resistance (25 °C/W at 3/8" lead length) rather than PCB conduction. To sustain full 5 W dissipation, its leads must be mechanically attached to a heatsink or chassis. When mounted on FR4 with standard copper pads, its usable power drops to 1.47 W at 25°C ambient-so thermal design must prioritize lead conduction, not board layout.
Does the 1N5370CE3/TR12 meet RoHS requirements?
Yes, the 1N5370CE3/TR12 is RoHS compliant, confirmed by the "e3" suffix in its part number. Its leads feature annealed matte-tin plating per MIL-STD-750 Method 2026, and its void-free UL94V-0 epoxy body complies with lead-free soldering standards-including 260°C for 10 seconds. No exemptions or declarations are required for standard use cases.
What is the maximum reverse leakage current for the 1N5370CE3/TR12?
The 1N5370CE3/TR12 specifies a maximum reverse leakage current (IR) of 0.5 μA at a reverse test voltage (VR) of 42.6 V-corresponding to 75% of its nominal 56 V Zener voltage. This ultra-low leakage ensures minimal error in high-impedance reference circuits and preserves regulation accuracy in battery-powered or low-quiescent-current applications.
Can the 1N5370CE3/TR12 be used as a direct replacement for the 1N5370B?
The 1N5370CE3/TR12 is not a drop-in replacement for the 1N5370B due to its tighter ±2% tolerance and RoHS-compliant plating, though both share identical package, polarity marking, and thermal characteristics. System validation is required to confirm that the improved tolerance does not cause over-regulation or interaction with existing feedback compensation networks.
1N5370CE3/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
1N5370CE3/TR12 FAQ
1.How can I place an order for 1N5370CE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370CE3/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 1N5370CE3/TR12 reliable?
The price and inventory of 1N5370CE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370CE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5370CE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370CE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370CE3/TR12?
1N5370CE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370CE3/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 1N5370CE3/TR12?
For technical support, including 1N5370CE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370CE3/TR12 requirements.
6.How does Aetrix verify that 1N5370CE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5370CE3/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 1N5370CE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5370CE3/TR12?
All 1N5370CE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370CE3/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 1N5370CE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5370CE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370CE3/TR12 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
