My Inquiry
My Account
Microchip Technology 1N4756AP/TR12
- Part No.:
- 1N4756AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4756AP/TR12.pdf
- Description:
- DIODE ZENER 47V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,738
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4756AP/TR12 from Microsemi is a 1.0 W, 47 V ±5% axial-lead silicon Zener diode in DO-41 (DO-204AL) plastic package, designed for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation across industrial and embedded systems.
For engineers reviewing the 1N4756AP/TR12 datasheet, 1N4756AP/TR12 pinout, 1N4756AP/TR12 application, or 1N4756AP/TR12 equivalent, key selection criteria include its 47 V nominal Zener voltage at 5.5 mA test current, 80 Ω dynamic impedance, 1500 mA maximum regulator current at 50°C, -65°C to +150°C operating temperature range, and RoHS-compliant "e3" plating option.
Technical Context
This Zener operates in reverse breakdown mode with cathode band indicating polarity; regulation is stable across 1.0 mA to 1500 mA DC current and maintains ±5% tolerance at 25°C lead temperature. Its thermal resistance is 45°C/W junction-to-lead (3/8″ lead length) and 105°C/W junction-to-ambient on FR4 board.
The device exhibits a typical temperature coefficient near +19 mV/°C (per Figure 3), supports 260°C/10s soldering, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Moisture sensitivity is Level 1 per J-STD-020B - no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V ±5% at IZT = 5.5 mA - defines stable regulation point for feedback and clamping |
| Power Dissipation | 1.0 W at TL ≤ 105°C - sets maximum continuous DC power handling on PCB |
| Dynamic Impedance (ZZT) | 80 Ω at IZT = 5.5 mA - determines output voltage variation under load transients |
| Max Regulator Current (IZM) | 1500 mA at TA = 50°C - defines peak safe DC current before thermal runaway |
| Reverse Leakage (IR) | 5 μA max at VR = 35.8 V - ensures low standby power loss in high-impedance bias networks |
| Operating Temperature | -65°C to +150°C - enables use in automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage | 1.2 V max at IF = 200 mA - relevant for series protection or dual-direction clamp configurations |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic molded epoxy case (UL94V-0), cathode indicated by color band. Terminals are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased positive relative to cathode |
| Cathode | Banded end | Connected to higher-potential node; Zener breakdown occurs when cathode is ≥47 V above anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior - enables drop-in replacement in legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body G-suffix variants - improves power derating margin on PCB |
| Level 1 moisture sensitivity | No dry pack or baking required before SMT reflow - reduces manufacturing overhead |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
| RoHS-compliant "e3" option | Matte-tin plating compliant with EU RoHS Directive - supports global environmental compliance programs |
Applications
| Power Supply Feedback Regulation | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in TL431-based or discrete op-amp feedback networks to set precise output voltage in AC/DC and DC/DC converters. IC Role / Device Role / Timing Role: Voltage reference element providing stable 47 V reference for error amplifier comparison. Use Value: Maintains ±5% output accuracy over line/load/temperature with minimal drift due to low knee impedance (19 Ω at IZK = 0.25 mA). | Use Scenario: Placed across sensitive IC inputs or bus lines to shunt transient surges exceeding 47 V. IC Role / Device Role / Timing Role: Passive clamping device limiting voltage excursion during ESD or inductive switching events. Use Value: Withstands 1500 mA surge current (½-sine, 1/120 s) and limits clamped voltage to ≤47.5 V at rated current. |
| Reference Voltage Source | Current Source Bias Network |
Use Scenario: Provides fixed bias voltage for analog sensor excitation, ADC reference dividers, or comparator thresholds. IC Role / Device Role / Timing Role: Stable DC voltage source independent of supply variation within specified current range. Use Value: Delivers 47 V with <80 Ω dynamic impedance - minimizes noise coupling and improves PSRR in precision analog stages. | Use Scenario: Configured with series resistor to generate constant current for LED drivers or transistor biasing. IC Role / Device Role / Timing Role: Voltage-regulating element establishing fixed VBE or VGS bias point. Use Value: Enables predictable 5.5 mA Zener test current operation - simplifies resistor calculation for ±1% current stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4756A | No TR12 tape-and-reel suffix; bulk or ammo-pack only | Same electrical specs and DO-41 package; differs only in packaging format | Select 1N4756A for manual prototyping or low-volume hand-soldering; 1N4756AP/TR12 for automated pick-and-place |
| MMBZ5265BS-7-F | SOT-23 surface-mount package; 47 V ±5%, 225 mW rating; 20 Ω ZZT at 10 mA | Lower power, smaller footprint - suitable for space-constrained portable electronics, not high-current regulation | Choose MMBZ5265BS-7-F only when board area is critical and power dissipation ≤225 mW; retain 1N4756AP/TR12 for >500 mW loads |
Compared with 1N4756A and MMBZ5265BS-7-F, the 1N4756AP/TR12 offers full 1.0 W power handling in axial-lead form factor with verified tape-and-reel compatibility for high-speed assembly - making it optimal for industrial power supplies requiring robust, field-proven regulation.
Availability
1N4756AP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision reference voltage generation requiring stable component supply and long-term lifecycle support.
Supply support for 1N4756AP/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 solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered for ruggedized voltage regulation in mission-critical power systems - emphasizing thermal stability, wide temperature operation, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance of the 1N4756AP/TR12?
The 1N4756AP/TR12 has a nominal Zener voltage of 47 V with a tolerance of ±5%, as indicated by the "A" suffix per JEDEC standard. This tolerance is guaranteed at 25°C lead temperature with 5.5 mA test current and applies across the full operating temperature range of -65°C to +150°C, though voltage drift versus temperature follows a typical +19 mV/°C coefficient.
Does the 1N4756AP/TR12 require dry packing before reflow soldering?
No, the 1N4756AP/TR12 does not require dry packing. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking or desiccant packaging prior to soldering - simplifying inventory handling and SMT line preparation.
What is the maximum continuous current the 1N4756AP/TR12 can handle at room temperature?
At 25°C ambient (or 105°C lead temperature), the 1N4756AP/TR12 supports up to 1500 mA DC current while maintaining regulation, provided thermal management meets the specified 45°C/W junction-to-lead resistance. Derating begins linearly above 105°C lead temperature, reaching zero power at 175°C.
Is the 1N4756AP/TR12 RoHS compliant?
Yes, the 1N4756AP/TR12 is RoHS compliant. The "e3" suffix in the full manufacturer part number (1N4756AP,e3/TR12) confirms annealed matte-tin terminal plating meeting EU RoHS Directive 2011/65/EU requirements. Lead-free assembly compatibility is validated for 260°C/10s soldering per MIL-STD-750.
How does the plastic "P" suffix affect thermal performance compared to glass-body versions?
The "P" suffix denotes plastic encapsulation, which provides lower thermal resistance than glass-body "G" variants of the same 1N4756A part number. Specifically, the 1N4756AP/TR12 achieves 45°C/W junction-to-lead (vs. ~60°C/W for glass), improving power derating capability and enabling higher sustained current in thermally constrained layouts.
1N4756AP/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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 35.8 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)
1N4756AP/TR12 FAQ
1.How can I place an order for 1N4756AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4756AP/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 1N4756AP/TR12 reliable?
The price and inventory of 1N4756AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4756AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4756AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4756AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4756AP/TR12?
1N4756AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4756AP/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 1N4756AP/TR12?
For technical support, including 1N4756AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4756AP/TR12 requirements.
6.How does Aetrix verify that 1N4756AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4756AP/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 1N4756AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4756AP/TR12?
All 1N4756AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4756AP/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 1N4756AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4756AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4756AP/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…
