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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N4757CP/TR12

Name: 1N4757CP/TR12
Brand: Microchip Technology
SKU: 1N4757CP/TR12
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4757CP/TR12

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N4757CP/TR12.pdf

Description:: DIODE ZENER 51V 1W DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:6,126

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Product details

Overview

1N4757CP/TR12 from Microsemi is a 51 V, ±5% tolerance, 1 W axial-lead silicon Zener diode in DO-41 plastic package, rated for 5.0 mA test current, 95 Ω dynamic impedance at I_ZT, and 1500 mA maximum regulator current at T_L = 50°C, used for precision voltage reference and overvoltage protection in DC power supplies and analog circuits.

For engineers reviewing the 1N4757CP/TR12 datasheet, 1N4757CP/TR12 pinout, 1N4757CP/TR12 application, or 1N4757CP/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (1500 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12).

Technical Context

This Zener operates in reverse breakdown to maintain stable 51 V regulation across a wide current range (5–1500 mA) and temperature span (−65°C to +150°C). Its 95 Ω dynamic impedance at 5.0 mA ensures low output variation under load transients, while the 0.25 W maximum knee current (I_ZK) supports stable regulation near threshold.

The DO-41 package delivers 45°C/W junction-to-lead thermal resistance at 10 mm lead length, enabling reliable 1 W dissipation without forced cooling. Polarity is marked by cathode band; operation requires cathode positive relative to anode for regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	51 V ±5% at 5.0 mA - defines nominal regulation point with tight production control
Power Dissipation	1.0 W at T_L < 105°C - supports continuous operation in compact PCB layouts with 10 mm lead length
Dynamic Impedance (Z_ZT)	95 Ω at I_ZT = 5.0 mA - limits output voltage shift under small-signal current changes
Max Regulator Current (I_ZM)	1500 mA at T_L = 50°C - enables high-current shunt regulation or transient clamping
Thermal Resistance	45°C/W junction-to-lead - allows direct thermal path to PCB copper or heatsink via leads
Reverse Leakage	5 µA max at V_R = 38.8 V - ensures minimal quiescent current in standby mode
Forward Voltage	1.2 V max at 200 mA - supports use as standard rectifier if forward-biased in design

Pinout & Package

DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by colored band; terminals are unmarked anode and banded cathode.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reference node for reverse bias	Connected to lower-potential side of regulated circuit; must be negative relative to cathode during regulation
Cathode	Zener regulation terminal	Banded end; connected to higher-potential side; carries full regulator/surge current during breakdown

Key Features

Feature	Design Value
JEDEC-registered 1N47xxAP series	Industry-standard footprint and electrical behavior compatible with legacy designs and automated assembly
RoHS-compliant matte-tin plating	Solderable per MIL-STD-750 Method 2026; eliminates lead-based solder compatibility concerns
Moisture sensitivity Level 1	No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and storage logistics
Nonsensitive to ESD	Qualified per MIL-STD-750 Method 1020 - reduces need for special ESD controls during board assembly

Applications

DC Power Supply Regulation	Overvoltage Protection Circuit
Use Scenario: Stabilizing +51 V rail in linear power supplies for instrumentation amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 51 V setpoint for series pass transistor biasing. Use Value: Maintains ±5% output accuracy across 5–1500 mA load range and −40°C to +85°C ambient.	Use Scenario: Clamping transient spikes on 48 V telecom backplane lines. IC Role / Device Role / Timing Role: Crowbar element diverting surge energy above 51 V to ground before downstream ICs are damaged. Use Value: Withstands 1500 mA non-repetitive surge per JEDEC spec, limiting peak voltage to ≤53.6 V.
Industrial Sensor Excitation	Calibration Reference Source
Use Scenario: Providing stable excitation voltage for 4–20 mA loop-powered pressure transducers. IC Role / Device Role / Timing Role: Precision voltage source establishing fixed bias for Wheatstone bridge sensors. Use Value: 95 Ω dynamic impedance minimizes output droop during sensor current draw variations.	Use Scenario: Serving as traceable 51 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary voltage standard against which DMM ADC gain/offset are adjusted. Use Value: ±5% initial tolerance and <±0.05%/°C tempco support mid-tier metrology requirements.

DC Power Supply Regulation

Overvoltage Protection Circuit

Use Scenario: Stabilizing +51 V rail in linear power supplies for instrumentation amplifiers.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 51 V setpoint for series pass transistor biasing.

Use Value: Maintains ±5% output accuracy across 5–1500 mA load range and −40°C to +85°C ambient.

Use Scenario: Clamping transient spikes on 48 V telecom backplane lines.

IC Role / Device Role / Timing Role: Crowbar element diverting surge energy above 51 V to ground before downstream ICs are damaged.

Use Value: Withstands 1500 mA non-repetitive surge per JEDEC spec, limiting peak voltage to ≤53.6 V.

Industrial Sensor Excitation

Calibration Reference Source

Use Scenario: Providing stable excitation voltage for 4–20 mA loop-powered pressure transducers.

IC Role / Device Role / Timing Role: Precision voltage source establishing fixed bias for Wheatstone bridge sensors.

Use Value: 95 Ω dynamic impedance minimizes output droop during sensor current draw variations.

Use Scenario: Serving as traceable 51 V reference in portable multimeter calibration fixtures.

IC Role / Device Role / Timing Role: Primary voltage standard against which DMM ADC gain/offset are adjusted.

Use Value: ±5% initial tolerance and <±0.05%/°C tempco support mid-tier metrology requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4757A	No "P" suffix → glass-body DO-35 package; higher thermal resistance (105°C/W junction-to-ambient)	Less suitable for high-power-density layouts; requires larger copper area for same dissipation	Select 1N4757CP/TR12 when DO-41 mechanical robustness and lower thermal resistance are required
MMSZ5255B-TP	Surface-mount SOD-123; 51 V ±5%, but rated 500 mW only and 100 Ω Z_ZT at 20 mA	Not interchangeable in through-hole designs; limited surge capability (250 mA)	Choose MMSZ5255B-TP only for space-constrained PCBs where 1 W dissipation is not needed

Compared with 1N4757A and MMSZ5255B-TP, the 1N4757CP/TR12 offers superior thermal performance in axial-lead form factor and higher surge current handling, making it optimal for industrial power and protection roles where reliability under sustained load matters.

Availability

1N4757CP/TR12 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and industrial sensor excitation requiring stable component supply and long-term obsolescence management.

Supply support for 1N4757CP/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, RF, and timing components for aerospace, defense, and industrial markets.

The 1N47xxAP series was designed to deliver JEDEC-standardized, high-stability Zener regulation in ruggedized plastic packages for mission-critical power conditioning and voltage reference applications.

FAQ

What is the Zener voltage tolerance for 1N4757CP/TR12?

The 1N4757CP/TR12 has a nominal Zener voltage of 51 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This means the actual measured V_Z at 5.0 mA test current falls between 48.45 V and 53.55 V at T_L = 25°C. The "P" suffix confirms plastic DO-41 construction, and "TR12" denotes tape-and-reel packaging per EIA-296 standard.

Does 1N4757CP/TR12 meet RoHS requirements?

Yes, the 1N4757CP/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation and its matte-tin terminal plating qualified per MIL-STD-750 Method 2026. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for environmentally regulated industrial and commercial designs.

What is the maximum surge current rating for 1N4757CP/TR12?

The 1N4757CP/TR12 is rated for a maximum non-repetitive reverse surge current (I_SM) of 1500 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating applies only to short-duration transients and must be derated per the power derating curve in Figure 1 of the datasheet when ambient or lead temperature exceeds 50°C.

Can 1N4757CP/TR12 be used in surface-mount designs?

No, the 1N4757CP/TR12 uses a DO-41 axial-lead package and is not suitable for surface-mount assembly. For SMT equivalents, Microsemi offers the SMAJ4757A (SMA package) and MLL4757A (SOD-123 variant), both sharing the same 51 V ±5% electrical specification but differing in thermal performance and mounting method. Substitution requires PCB layout revision.

What is the thermal resistance of 1N4757CP/TR12, and how does it affect layout?

The 1N4757CP/TR12 has a junction-to-lead thermal resistance of 45°C/W when measured at 10 mm lead length from the body. This means each watt dissipated raises the junction temperature 45°C above lead temperature. To sustain full 1 W operation, keep lead temperature below 105°C - achievable via adequate copper pour, short leads, and avoidance of nearby heat sources on the PCB.

1N4757CP/TR12 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 51 V

Tolerance:: ±2%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 95 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 38.8 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

1N4757CP/TR12 FAQ

1.How can I place an order for 1N4757CP/TR12 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4757CP/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 1N4757CP/TR12 reliable?

The price and inventory of 1N4757CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4757CP/TR12 is usually 5 days.

3.What payment methods are accepted for 1N4757CP/TR12?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4757CP/TR12 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4757CP/TR12?

1N4757CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4757CP/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 1N4757CP/TR12?

For technical support, including 1N4757CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4757CP/TR12 requirements.

6.How does Aetrix verify that 1N4757CP/TR12 is sourced from the original manufacturer or authorized distributors?

All 1N4757CP/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 1N4757CP/TR12 meets industry standards.

7.What is the process for return or replacement of 1N4757CP/TR12?

All 1N4757CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4757CP/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 1N4757CP/TR12 part is unused and in its original packaging.

Return procedure for 1N4757CP/TR12:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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