My Inquiry
My Account
Microchip Technology 1N4747CPE3/TR12
- Part No.:
- 1N4747CPE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747CPE3/TR12.pdf
- Description:
- DIODE ZENER 20V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,033
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4747CPE3/TR12 from Microsemi is a 20 V, ±2% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 12.5 mA test current (IZT), 45 Ω dynamic impedance (ZZT), and 225 mA maximum regulator current (IZM) at 50°C. It provides precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4747CPE3/TR12 datasheet, 1N4747CPE3/TR12 pinout, 1N4747CPE3/TR12 application, or 1N4747CPE3/TR12 equivalent, key selection criteria include its tight 2% Zener voltage tolerance, DO-41 axial-leaded mechanical form factor, RoHS-compliant matte-tin plating, and validated thermal resistance of 45 °C/W junction-to-lead at 10 mm lead length.
Technical Context
This Zener operates in reverse breakdown to maintain stable 20 V output across a wide current range (0.25–225 mA), with low knee impedance (50 Ω at IZK = 0.25 mA) ensuring sharp regulation onset. Its ±2% tolerance (denoted by "C" suffix) and 105 °C/W junction-to-ambient thermal resistance on FR4 enable reliable performance in industrial power rails and analog reference stages.
The device features moisture sensitivity Level 1 per J-STD-020B (no dry pack required), nonsensitive ESD behavior per MIL-STD-750 Method 1020, and UL94V-0 epoxy encapsulation. Cathode polarity is marked by a band; operation requires cathode-positive bias relative to anode for regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±2% at 12.5 mA - enables precise 20 V reference generation with minimal calibration drift |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous regulation in compact through-hole layouts with 10 mm lead length |
| Dynamic Impedance (ZZT) | 45 Ω at IZT = 12.5 mA - ensures low output voltage variation under load transients |
| Max Regulator Current (IZM) | 225 mA at TA = 50°C - defines safe DC current limit before thermal runaway in linear regulator feedback paths |
| Reverse Leakage (IR) | 5 μA at VR = 15.2 V - guarantees minimal quiescent current in high-impedance sensing nodes |
| Thermal Resistance (RθJL) | 45 °C/W junction-to-lead - allows accurate junction temperature estimation using lead temperature measurement |
| Operating Temperature | −65°C to +150°C - supports deployment in automotive engine control units and industrial motor drives |
Pinout & Package
Package: DO-41 (DO-204AL) axial-leaded plastic case, void-free thermosetting epoxy, UL94V-0 rated, 0.7 g weight, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased during regulation |
| Cathode | Zener regulation output terminal | Banded end; held at stable 20 V above anode when reverse current ≥ IZK (0.25 mA) |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Reduces need for post-assembly trimming in 20 V reference designs, improving yield in production test |
| RoHS-compliant matte-tin plating | Enables lead-free reflow soldering at 260°C for 10 s without degradation, compliant with IPC-J-STD-020 |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to assembly, lowering manufacturing cost and cycle time |
| Nonsensitive to ESD (MIL-STD-750) | Withstands handling without special grounding protocols, simplifying board-level integration in low-volume labs |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body variants (G-suffix), improving power handling in confined spaces |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Zener diode providing fixed 20 V reference to optocoupler input or TL431 shunt regulator. Use Value: Tight ±2% tolerance ensures consistent output voltage regulation across temperature and line variations. |
Use Scenario: Clamping transient surges on 24 V industrial I/O lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Shunt protection element diverting excess energy to ground when line voltage exceeds 20 V. Use Value: 1 W power rating and 225 mA IZM support sustained clamping without thermal failure during repeated 100 ms transients. |
| Automotive Sensor Biasing | Analog Front-End Voltage Reference |
Use Scenario: Providing stable bias voltage to pressure or temperature sensor signal conditioning circuits in engine compartments. IC Role / Device Role / Timing Role: Precision Zener supplying regulated 20 V to op-amp rails or ADC reference buffers. Use Value: −65°C to +150°C operating range and low tempco ensure accuracy across extreme ambient conditions. |
Use Scenario: Generating clean 20 V reference for 16-bit SAR ADCs in test equipment requiring low-noise analog inputs. IC Role / Device Role / Timing Role: Low-impedance voltage source minimizing reference drift in high-resolution data acquisition systems. Use Value: 45 Ω ZZT and 50 Ω ZZK reduce noise coupling into reference pins, preserving effective number of bits (ENOB). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A | Same 20 V nominal, but ±5% tolerance (A suffix) vs. ±2% (C suffix); identical DO-41 package and 1 W rating | Acceptable where tighter tolerance is not required; higher unit cost savings in non-critical references | Select 1N4747A only if system-level testing confirms 5% VZ variation meets regulation margin requirements |
| BZX55C20 | 20 V ±5%, 500 mW rating, DO-35 package - smaller footprint but 50% lower power dissipation | Suitable for low-current biasing (<100 mA), not recommended for sustained 200 mA clamping loads | Choose BZX55C20 only for space-constrained PCBs where thermal derating and peak current limits are verified |
Compared with 1N4747CPE3/TR12, the 1N4747A offers cost advantage at reduced precision, while BZX55C20 trades power capability for size - neither is pin-compatible due to differing DO-41 vs. DO-35 mechanical footprints, requiring layout revision.
Availability
1N4747CPE3/TR12 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage clamp protection, and automotive sensor biasing requiring stable component supply with full traceability and RoHS compliance.
Supply support for 1N4747CPE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xx series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems - emphasizing thermal stability, long-term parametric consistency, and military-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4747CPE3/TR12?
The 1N4747CPE3/TR12 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in its part number. This means its measured VZ at 12.5 mA test current falls within 19.6 V to 20.4 V at 25°C lead temperature. This tighter tolerance improves accuracy in precision reference applications compared to standard ±5% variants like the 1N4747A.
Is the 1N4747CPE3/TR12 RoHS compliant?
Yes, the 1N4747CPE3/TR12 is RoHS compliant, confirmed by the "e3" suffix in its part number. It uses annealed matte-tin plating on its axial leads and meets JEDEC/IPC standards for lead-free soldering, including 260°C for 10 seconds. The device is also moisture sensitivity Level 1, eliminating dry-pack requirements.
What package type does the 1N4747CPE3/TR12 use?
The 1N4747CPE3/TR12 uses the DO-41 (JEDEC DO-204AL) axial-leaded plastic package. Its dimensions conform to standard DO-41 outlines, with a 0.7 g mass, UL94V-0 epoxy body, and cathode identified by a visible band. The "P" in the part number explicitly denotes plastic construction, distinguishing it from glass-body variants.
What is the maximum steady-state current the 1N4747CPE3/TR12 can regulate?
The 1N4747CPE3/TR12 supports a maximum regulator current (IZM) of 225 mA at 50°C ambient temperature when mounted on FR4 with specified copper pads. At higher temperatures, derating applies per Figure 1 in the datasheet; at 105°C lead temperature, the safe DC current drops to approximately 125 mA to maintain 1 W power limit.
How is polarity marked on the 1N4747CPE3/TR12?
Polarity is marked by a single color band near one end of the DO-41 package - this band identifies the cathode terminal. For proper Zener regulation, the banded (cathode) end must be held at a higher potential than the unbanded (anode) end. Forward voltage is ≤1.2 V at 200 mA, confirming standard silicon diode behavior in forward bias.
1N4747CPE3/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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 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)
1N4747CPE3/TR12 FAQ
1.How can I place an order for 1N4747CPE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747CPE3/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 1N4747CPE3/TR12 reliable?
The price and inventory of 1N4747CPE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747CPE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4747CPE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747CPE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4747CPE3/TR12?
1N4747CPE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747CPE3/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 1N4747CPE3/TR12?
For technical support, including 1N4747CPE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747CPE3/TR12 requirements.
6.How does Aetrix verify that 1N4747CPE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4747CPE3/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 1N4747CPE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4747CPE3/TR12?
All 1N4747CPE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747CPE3/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 1N4747CPE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4747CPE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4747CPE3/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…
