My Inquiry
My Account
Microchip Technology 1N4737CP/TR8
- Part No.:
- 1N4737CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737CP/TR8.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,296
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4737CP/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with a nominal zener voltage of 7.5 V ±5%, 34 mA test current (IZT), 4.0 Ω dynamic impedance (ZZT), and maximum reverse leakage of 5 μA at 6.0 V. It operates from –65 °C to +150 °C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the 1N4737CP/TR8 datasheet, 1N4737CP/TR8 pinout, 1N4737CP/TR8 application, or 1N4737CP/TR8 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (605 mA), RoHS-compliant matte-tin plating, and DO-41 package compatibility with standard axial-lead PCB layouts.
Technical Context
This device functions as a two-terminal voltage reference operating in reverse breakdown, where regulation stability relies on controlled avalanche conduction. Its 7.5 V nominal zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift across industrial temperature ranges.
The DO-41 plastic package provides moisture sensitivity Level 1 per J-STD-020B, eliminating dry-pack requirements, while its 0.7 g mass and void-free UL94V-0 epoxy body support reliable through-hole mounting and thermal dissipation at TL < 105 °C with 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at IZT = 34 mA - defines stable regulation point under typical bias conditions |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous DC power handling with 3/8″ lead length |
| Dynamic Impedance | 4.0 Ω at IZT = 34 mA - determines output voltage variation under load current changes |
| Reverse Leakage | 5 μA max at VR = 6.0 V - ensures low standby current in shunt regulator configurations |
| Surge Current (ISM) | 605 mA peak (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design with measurable lead temperature rise |
| Operating Temperature | –65 °C to +150 °C - qualifies for extended-range industrial and automotive under-hood use |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by color band; terminals are non-polarized for through-hole insertion but require banded end to be connected to higher potential during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Lower-potential terminal during Zener operation | Connected to circuit ground or lower-voltage rail in shunt regulation |
| Cathode | Higher-potential terminal during Zener operation | Banded end; connects to unregulated input or feedback node requiring stable reference |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N4737A series | Ensures cross-manufacturer interchangeability and standardized test conditions |
| RoHS-compliant "e3" suffix | Matte-tin plating meets lead-free soldering requirements per JEDEC J-STD-020B |
| Moisture sensitivity Level 1 | Enables immediate PCB assembly without baking or dry-pack handling |
| Nonsensitive to ESD | Withstands MIL-STD-750 Method 1020 testing - no special handling required |
| Plastic P-suffix construction | Delivers lower thermal resistance than glass-body (G-suffix) equivalents |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Shunt-connected across optocoupler input in isolated flyback converter feedback path. IC Role / Device Role / Timing Role: Provides stable 7.5 V reference to bias TL431-like error amplifier input. Use Value: Maintains ±1% output regulation despite line/load transients due to low ZZT and tight VZ tolerance. | Use Scenario: Biasing bridge sensor excitation in 4–20 mA transmitter front-end. IC Role / Device Role / Timing Role: Serves as precision voltage reference for Wheatstone bridge excitation and ADC reference scaling. Use Value: Enables <10 ppm/°C system-level drift via matched temperature coefficient behavior near 7.5 V. |
| Overvoltage Clamp Circuit | Microcontroller I/O Protection |
Use Scenario: Connected between 12 V rail and ground to limit transient spikes from relay coils or motor back-EMF. IC Role / Device Role / Timing Role: Acts as passive crowbar to clamp voltage to 7.5 V + forward drop during surges. Use Value: Absorbs 605 mA peak surge current without degradation, protecting downstream regulators and logic. | Use Scenario: Placed between microcontroller GPIO and external analog signal line subject to ESD events. IC Role / Device Role / Timing Role: Functions as bidirectional ESD clamp (with series resistor) to limit voltage excursion. Use Value: Leverages low leakage (5 μA) and fast response to suppress >8 kV HBM transients without loading signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A | No "P" suffix indicates glass-body construction; higher thermal resistance (≈65 °C/W) | Less suitable for high-power-density layouts requiring efficient heat transfer through leads | Select 1N4737CP/TR8 when thermal performance or moisture robustness is critical |
| BZX55C7V5 | Same 7.5 V ±5%, but rated at 500 mW; DO-35 package; higher ZZT (10 Ω) | Not recommended for 1 W continuous regulation; limited surge capability (300 mA) | Choose BZX55C7V5 only for space-constrained, low-power biasing where DO-41 footprint is unavailable |
Compared with 1N4737A and BZX55C7V5, the 1N4737CP/TR8 delivers superior thermal management, guaranteed RoHS compliance, and higher surge immunity-making it optimal for industrial-grade power regulation where reliability and long-term stability are prioritized over minimal cost or size.
Availability
1N4737CP/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for 1N4737CP/TR8 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 markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems where long-term stability, ESD resilience, and moisture immunity are mandatory.
FAQ
What is the zener voltage tolerance of the 1N4737CP/TR8?
The 1N4737CP/TR8 has a nominal zener voltage of 7.5 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 34 mA test current and 25 °C lead temperature, ensuring predictable regulation in production designs without requiring post-manufacturing calibration.
Does the 1N4737CP/TR8 require dry-pack handling before PCB assembly?
No, the 1N4737CP/TR8 does not require dry-pack handling. Its DO-41 plastic package is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and assembled without baking or humidity-controlled environments-reducing manufacturing overhead and preventing moisture-related popcorning during reflow.
What is the maximum steady-state power dissipation for the 1N4737CP/TR8?
The 1N4737CP/TR8 is rated for 1.0 W steady-state power dissipation at a lead temperature (TL) below 105 °C with 3/8″ (10 mm) lead length from the body. Derating is required above this temperature, following the linear curve in Figure 1 of the Microsemi datasheet, to prevent thermal runaway or parameter shift.
Is the 1N4737CP/TR8 RoHS compliant?
Yes, the 1N4737CP/TR8 is RoHS compliant, as confirmed by the "e3" suffix in its full part number. It features annealed matte-tin plating on terminations and meets all substance restrictions defined in Directive 2011/65/EU, including lead content ≤1000 ppm, making it suitable for environmentally regulated global electronics production.
What is the cathode identification method for the 1N4737CP/TR8?
The cathode of the 1N4737CP/TR8 is identified by a distinct color band on the DO-41 package body. During Zener operation, this banded end must be connected to the higher-potential node (e.g., unregulated input rail), while the anode connects to the lower-potential node (e.g., ground or feedback reference point) to enable reverse-bias regulation.
1N4737CP/TR8 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):
- 7.5 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5 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)
1N4737CP/TR8 FAQ
1.How can I place an order for 1N4737CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737CP/TR8 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 1N4737CP/TR8 reliable?
The price and inventory of 1N4737CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4737CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737CP/TR8?
1N4737CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737CP/TR8 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 1N4737CP/TR8?
For technical support, including 1N4737CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737CP/TR8 requirements.
6.How does Aetrix verify that 1N4737CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4737CP/TR8 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 1N4737CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4737CP/TR8?
All 1N4737CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737CP/TR8, 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 1N4737CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4737CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737CP/TR8 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…
