My Inquiry
My Account
Microchip Technology 1N4737CE3/TR13
- Part No.:
- 1N4737CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737CE3/TR13.pdf
- Description:
- DIODE ZENER 7.5V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,119
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4737CE3/TR13 from Microsemi is a 7.5 V, ±2% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 34 mA test current, 4.0 Ω dynamic impedance at IZT, and 5 μA reverse leakage at 6.0 V, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4737CE3/TR13 datasheet, 1N4737CE3/TR13 pinout, 1N4737CE3/TR13 application, or 1N4737CE3/TR13 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (45 °C/W junction-to-lead), surge current rating (605 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging per EIA-296.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It delivers regulated 7.5 V with tight ±2% initial tolerance (C suffix) and exhibits low dynamic impedance (4.0 Ω at 34 mA) for minimal voltage deviation under dynamic current changes.
Designed for axial-lead mounting on FR4 PCBs, it features 45 °C/W junction-to-lead thermal resistance at 10 mm lead length and supports steady-state dissipation of 1.0 W below 105 °C lead temperature - enabling reliable operation in industrial power rails and analog reference stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±2% at 34 mA - ensures precise reference voltage in feedback loops and voltage clamp circuits |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous regulation in compact power supplies without forced cooling |
| Dynamic Impedance (ZZT) | 4.0 Ω at IZT = 34 mA - minimizes output voltage variation under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 6.0 V - guarantees low standby power loss in always-on reference designs |
| Surge Current (ISM) | 605 mA peak (½-sine, 1/120 s) - withstands brief overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables predictable thermal design with standard lead-forming practices |
| Operating Temperature | –65 °C to +150 °C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; terminals are nonsensitive to ESD per MIL-STD-750 Method 1020 and solderable with Sn/Pb or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit common 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; defines 7.5 V reference relative to anode during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables high-accuracy voltage references without external trimming in 5 V–12 V supply monitoring |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, eliminating lead-based solder compatibility concerns |
| Tape-and-reel packaging (TR13) | Supports automated SMT placement via EIA-296 standard carrier tape, reducing manual handling in production |
| Moisture sensitivity Level 1 | Per IPC/JEDEC J-STD-020B - no dry-pack or baking required prior to assembly, lowering manufacturing cost |
| Low knee impedance (ZZK) | 0.5 Ω at IZK = 5 mA - provides stable regulation even near minimum operating current |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides fixed 7.5 V reference point for error amplifier comparison. Use Value: ±2% tolerance ensures output voltage accuracy within ±0.15 V, critical for 5 V and 9 V system rails. | Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes on sensor interface lines. IC Role / Device Role / Timing Role: Acts as bidirectional voltage limiter, clamping positive surges to 7.5 V + VF. Use Value: 605 mA surge rating absorbs 100 ns–1 μs transients without failure, extending system reliability. |
| Industrial Sensor Excitation | Automotive Battery Monitoring |
Use Scenario: Supplying stable excitation voltage to resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Serves as low-drift voltage source for Wheatstone bridge biasing. Use Value: –65 °C to +150 °C operating range maintains regulation across ambient extremes in factory-floor enclosures. | Use Scenario: Monitoring 12 V battery voltage in engine control units with analog-to-digital converter input scaling. IC Role / Device Role / Timing Role: Divides and references battery voltage to match ADC full-scale range. Use Value: 4.0 Ω dynamic impedance limits voltage error to <10 mV under 10 mA load variation, improving measurement resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A | Same 7.5 V nominal, but ±5% tolerance (A suffix) vs. ±2% (C suffix) of 1N4737CE3/TR13 | Lower accuracy; acceptable where cost priority outweighs reference stability | Select when ±5% regulation suffices and RoHS compliance is not required |
| MMSZ4703T1G | Surface-mount SOD-123 package, same 7.5 V ±5%, 500 mW rating - not 1 W | Not suitable for 1 W continuous dissipation; limited to low-power portable designs | Choose only for space-constrained PCBs where thermal derating permits ≤500 mW operation |
Compared with 1N4737A and MMSZ4703T1G, the 1N4737CE3/TR13 offers tighter voltage tolerance and full 1 W power handling in through-hole DO-41 format - making it optimal for industrial power supplies requiring long-term stability and robust thermal performance without layout redesign.
Availability
1N4737CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitors, and sensor signal conditioning circuits requiring stable component supply with RoHS compliance and tape-and-reel delivery.
Supply support for 1N4737CE3/TR13 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 1N47xx series was designed specifically for precision DC voltage regulation in ruggedized power systems, emphasizing thermal robustness, wide temperature operation, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N4737CE3/TR13?
The 1N4737CE3/TR13 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This means its nominal 7.5 V breakdown voltage is guaranteed between 7.35 V and 7.65 V at 34 mA test current and 25 °C lead temperature - critical for high-accuracy reference applications where tighter regulation than the standard ±5% (1N4737A) is required.
Does the 1N4737CE3/TR13 meet RoHS requirements?
Yes, the 1N4737CE3/TR13 complies with EU RoHS Directive 2011/65/EU. The "e3" suffix confirms RoHS-compliant matte-tin plating on its axial leads, replacing traditional tin-lead finishes while maintaining solderability per MIL-STD-750 Method 2026 - verified in Microsemi's official documentation and supported by distributor certifications.
What is the maximum surge current rating for the 1N4737CE3/TR13?
The 1N4737CE3/TR13 has a maximum non-repetitive surge current (ISM) rating of 605 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This value is specified in the official Microsemi datasheet and reflects its ability to absorb short-duration overvoltage transients without parametric shift or failure.
Can the 1N4737CE3/TR13 be used in surface-mount designs?
No, the 1N4737CE3/TR13 uses a DO-41 axial-leaded package and is not surface-mount compatible. For SMT alternatives, Microsemi offers the SMAJ4737A (SMA package) and MLL4737A (SOD-123), though neither matches the 1N4737CE3/TR13's ±2% tolerance or 1 W power rating - confirming its role as a through-hole precision Zener.
What does the "TR13" suffix indicate in 1N4737CE3/TR13?
The "TR13" suffix indicates tape-and-reel packaging per EIA-296 standard, with 13-inch reels containing 5,000 units. This format supports automated pick-and-place assembly and is distinct from bulk or ammo-pack options - a key logistics detail for production planning and inventory management of the 1N4737CE3/TR13.
1N4737CE3/TR13 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)
1N4737CE3/TR13 FAQ
1.How can I place an order for 1N4737CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737CE3/TR13 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 1N4737CE3/TR13 reliable?
The price and inventory of 1N4737CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4737CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737CE3/TR13?
1N4737CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737CE3/TR13 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 1N4737CE3/TR13?
For technical support, including 1N4737CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737CE3/TR13 requirements.
6.How does Aetrix verify that 1N4737CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4737CE3/TR13 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 1N4737CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4737CE3/TR13?
All 1N4737CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737CE3/TR13, 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 1N4737CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N4737CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737CE3/TR13 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…
