My Inquiry
My Account
Microchip Technology 1N4740CP/TR12
- Part No.:
- 1N4740CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740CP/TR12.pdf
- Description:
- DIODE ZENER 10V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,817
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4740CP/TR12 from Microsemi is a 10 V, ±5% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 25 mA test current (IZT), 7 Ω dynamic impedance (ZZT), and 0.25 A maximum regulator current (IZM) at 50°C. It provides stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1N4740CP/TR12 datasheet, 1N4740CP/TR12 pinout, 1N4740CP/TR12 application, or 1N4740CP/TR12 equivalent, key selection considerations include its 10 V nominal Zener voltage, DO-41 axial-leaded package with cathode band polarity marking, 45 °C/W junction-to-lead thermal resistance, and RoHS-compliant "e3" plating with tape-and-reel packaging (TR12).
Technical Context
This device operates in reverse breakdown to maintain a stable 10 V reference across a wide current range (0.25 mA to 250 mA), with low dynamic impedance ensuring minimal voltage variation under load transients. Its Zener knee is sharp, verified by dual-point impedance measurement per MicroNote 202.
Designed for operation from –65°C to +150°C, it features moisture sensitivity Level 1 per J-STD-020B (no dry pack required), UL94V-0 epoxy case, and tin-lead or matte-tin terminations solderable per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V ±5% at 25°C, measured 90 s after DC current application - defines precise regulation point for feedback and clamping |
| Test Current (IZT) | 25 mA - operating point where VZ and ZZT are specified; typical bias for stable reference use |
| Dynamic Impedance (ZZT) | 7 Ω @ IZT - low AC impedance ensures minimal output voltage ripple under varying load currents |
| Max Regulator Current (IZM) | 250 mA at TL < 105°C (3/8″ lead length) - sets absolute safe continuous current limit before thermal runaway |
| Power Dissipation | 1.0 W at 25°C, derated linearly above 25°C (45 °C/W junction-to-lead) - determines heatsinking requirements on PCB |
| Reverse Leakage (IR) | 5 μA @ VR = 7.6 V - confirms tight regulation onset and low standby power loss in high-impedance bias networks |
| Forward Voltage (VF) | 1.2 V max @ 200 mA - defines conduction behavior during forward-biased fault conditions or polarity-reversal protection |
Pinout & Package
Package: DO-41 (DO-204AL), axial-leaded plastic encapsulated case with cathode indicated by colored band. Moisture sensitivity Level 1; no dry pack required. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated rail or error amplifier input; must be held ≥10 V above anode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior - enables drop-in replacement across multiple suppliers and legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants - improves power handling in compact layouts without forced cooling |
| RoHS-compliant "e3" termination | Matte-tin plating compatible with Pb-free reflow profiles up to 260°C for 10 s - supports modern assembly requirements without solderability compromise |
| Tape-and-reel packaging (TR12) | EIA-296 standard carrier - enables automated pick-and-place placement in high-volume manufacturing |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling during board assembly and testing |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in TL431-based or discrete op-amp feedback networks to regulate +12 V output of a flyback converter. IC Role / Device Role / Timing Role: Zener reference element setting precise error threshold for PWM controller shutdown or duty-cycle adjustment. Use Value: 10 V nominal voltage matches common auxiliary rail targets; ±5% tolerance ensures compliance with IEC 62368-1 overvoltage limits. | Use Scenario: Placed across DC bus of a motor drive to clamp transient spikes exceeding 15 V during MOSFET switching. IC Role / Device Role / Timing Role: Passive shunt regulator absorbing surge energy until crowbar or fuse activates. Use Value: 250 mA IZM rating sustains 100 ms surges up to 25 A (ISM = 454 mA), providing robust first-line protection without active components. |
| Industrial Sensor Reference | Programmable Logic Controller (PLC) Input Conditioning |
Use Scenario: Supplies stable 10 V reference to bridge sensor signal conditioning circuitry in a pressure transducer module. IC Role / Device Role / Timing Role: Precision voltage source for excitation and ratiometric ADC scaling. Use Value: Low 7 Ω ZZT minimizes reference drift under varying load from instrumentation amplifiers, maintaining <0.1% linearity error. | Use Scenario: Biasing optocoupler input LED in 24 V digital input stage of a DIN-rail PLC module. IC Role / Device Role / Timing Role: Voltage limiter protecting optocoupler against field-wiring transients and reverse polarity faults. Use Value: Cathode-band polarity marking ensures correct orientation; 150°C max storage temp supports extended operation in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | No TR12 tape-and-reel; bulk or ammo-pack only; same electrical specs and DO-41 package | Lacks automated assembly support; suitable for prototyping or low-volume hand-soldered builds | Select 1N4740CP/TR12 when SMT line integration and traceable lot control are required. |
| MMBZ5240BLT1G | SOT-23 surface-mount package; 10 V ±5%, 225 mW power rating; 20 mA IZT; 17 Ω ZZT | Lower power and smaller footprint - appropriate for space-constrained, low-current bias networks but not 1 W dissipation | Choose MMBZ5240BLT1G only if board area is critical and peak current remains below 100 mA. |
Compared with 1N4740A and MMBZ5240BLT1G, the 1N4740CP/TR12 uniquely combines full 1 W power handling, JEDEC-standard DO-41 mechanical compatibility, RoHS-compliant e3 plating, and EIA-296 tape-and-reel delivery-making it optimal for industrial power supplies requiring reliability, serviceability, and production scalability.
Availability
1N4740CP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, motor drive protection circuits, and sensor reference designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant procurement.
Supply support for 1N4740CP/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 1N47xxAP series was developed to deliver JEDEC-standard, high-stability Zener regulation in ruggedized plastic packages for mission-critical power management and protection functions in harsh-environment systems.
FAQ
What is the Zener voltage tolerance of the 1N4740CP/TR12?
The 1N4740CP/TR12 has a nominal Zener voltage of 10 V with a tolerance of ±5%, as indicated by the "A" suffix in the part number per JEDEC registration. This tolerance applies at 25°C with 25 mA test current and defines the guaranteed regulation window (9.5 V to 10.5 V) under standard operating conditions.
Does the 1N4740CP/TR12 require dry packing for moisture sensitivity?
No, the 1N4740CP/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without baking or dry pack. Its void-free thermosetting epoxy case inherently prevents moisture ingress during reflow or storage.
What is the maximum continuous current the 1N4740CP/TR12 can handle?
The 1N4740CP/TR12 supports a maximum regulator current (IZM) of 250 mA at lead temperature (TL) below 105°C with 3/8″ (10 mm) lead length from body. At ambient temperature (TA) < 45°C on FR4 board, this limit remains valid; derating is required above those temperatures per Figure 1 in the datasheet.
Is the 1N4740CP/TR12 RoHS compliant?
Yes, the "e3" suffix in 1N4740CP/TR12 denotes RoHS-compliant matte-tin plating on terminations, qualified for Pb-free reflow up to 260°C for 10 seconds. The device meets EU RoHS Directive 2011/65/EU and related exemptions for lead in high-melting-temperature solder alloys.
How is polarity marked on the 1N4740CP/TR12?
The 1N4740CP/TR12 uses a cathode band - a single colored stripe near one end of the DO-41 cylindrical body - to identify the cathode terminal. For proper Zener regulation, the banded end must be biased at a higher potential than the anode (unbanded) end.
1N4740CP/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):
- 10 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 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)
1N4740CP/TR12 FAQ
1.How can I place an order for 1N4740CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740CP/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 1N4740CP/TR12 reliable?
The price and inventory of 1N4740CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4740CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740CP/TR12?
1N4740CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740CP/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 1N4740CP/TR12?
For technical support, including 1N4740CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740CP/TR12 requirements.
6.How does Aetrix verify that 1N4740CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4740CP/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 1N4740CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4740CP/TR12?
All 1N4740CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740CP/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 1N4740CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4740CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740CP/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…
