My Inquiry
My Account
Microchip Technology 1N735
- Part No.:
- 1N735
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N735.pdf
- Description:
- DIODE ZENER 75V 250MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,662
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N735 from Microsemi is a silicon Zener voltage regulator diode rated for 75 V nominal zener voltage at 2 mA test current, 240 Ω dynamic impedance, and 0.25 W power dissipation in DO-35 glass package. It serves as a precision voltage reference or overvoltage clamp in avionics power supplies and L-band radar bias networks.
For engineers reviewing the 1N735 datasheet, 1N735 pinout, 1N735 application, or 1N735 equivalent, key selection factors include its ±10% voltage tolerance, low-power glass-body construction, MIL-qualified thermal stability, and suitability for high-reliability analog reference and protection circuits.
Technical Context
The 1N735 operates as a two-terminal voltage reference device with reverse-biased breakdown behavior defined at IZT = 2 mA and TA = 25 °C. Its 75 V nominal zener voltage falls within the high-voltage Zener range used for intermediate rail regulation and sensor excitation.
Designed for operation in ambient temperatures up to +175 °C (per Microsemi's legacy military-grade qualification), it exhibits stable breakdown characteristics without series resistance trimming or temperature compensation circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal at IZT = 2 mA - sets precise clamping level for overvoltage protection |
| Power Dissipation (PD) | 0.25 W - limits continuous thermal load in DO-35 package without heatsink |
| Dynamic Impedance (ZZT) | 240 Ω at IZT = 2 mA - indicates moderate regulation stiffness under small-signal variation |
| Voltage Tolerance | ±10% - defines absolute VZ spread (67.5–82.5 V) for production binning and design margining |
| Test Current (IZT) | 2 mA - standard condition for specifying VZ and ZZT; determines minimum bias for stable regulation |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no external bias control or enable logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 75 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Zener Reference | 75 V nominal breakdown enables direct regulation of intermediate supply rails without cascading devices |
| MIL-qualified Thermal Stability | Rated for operation up to +175 °C ambient supports use in avionics and radar power stages |
| Low-Power Glass Package | DO-35 construction provides hermetic sealing and proven reliability in harsh environments |
| Precision Voltage Tolerance | ±10% binning allows predictable worst-case margining in safety-critical clamp designs |
Applications
| Avionics Power Supply Clamping | L-Band Radar Bias Network |
|---|---|
Use Scenario: Protects sensitive receiver front-end components from transient overvoltage during lightning-induced surges in airborne systems. IC Role / Device Role / Timing Role: Zener diode acting as passive shunt clamp referenced to chassis ground. Use Value: 75 V breakdown threshold aligns with MIL-STD-704A transient limits for 28 V DC systems. | Use Scenario: Provides stable bias voltage for GaAs FET drivers in pulsed L-band radar transmitters. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing fixed gate bias point. Use Value: 240 Ω dynamic impedance ensures minimal drift under varying load current in RF amplifier stages. |
| LED Driver Reference | WLAN Power Amplifier Protection |
Use Scenario: Sets current-limit threshold in constant-current LED driver feedback loop for backlight inverters. IC Role / Device Role / Timing Role: Precision voltage reference enabling accurate current sense comparator trip point. Use Value: ±10% VZ tolerance allows robust design margin against LED forward voltage variation across temperature. | Use Scenario: Guards WLAN PA output stage against VSWR-induced voltage spikes during antenna mismatch events. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing reflected energy above 75 V. Use Value: DO-35 glass package withstands repetitive surge stress without parameter shift or catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | 75 V nominal, ±5% tolerance, 1 W power rating, DO-41 package | Higher power handling but larger footprint and looser thermal response in compact avionics layouts | Prefer when higher surge energy absorption is required and board space permits DO-41 mounting |
| MMBZ5269BLT1G | 75 V nominal, ±5% tolerance, 0.225 W, SOD-123 surface-mount package | No axial leads; requires reflow assembly and lacks MIL-qualified high-temp validation | Select only for commercial-grade, space-constrained PCBs where military qualification is not mandated |
Compared with 1N735, the 1N4745A offers greater power margin but sacrifices avionics-grade thermal stability and package ruggedness, while the MMBZ5269BLT1G trades hermetic reliability for miniaturization-neither is pin-compatible due to differing form factors and qualification scope.
Availability
1N735 is available at Aetrix Electronics and suitable for avionics power supply clamping, L-band radar bias networks, and LED driver reference applications requiring stable component supply across extended lifecycle programs.
Supply support for 1N735 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 Corporation (now part of Microchip Technology) specialized in high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N735 belongs to Microsemi's legacy military-grade Zener diode family, engineered for stable voltage reference and transient suppression in mission-critical RF and power systems.
FAQ
What is the nominal zener voltage of the 1N735 and under what test conditions is it specified?
The 1N735 has a nominal zener voltage of 75 V, specified at a test current (IZT) of 2 mA and ambient temperature (TA) of 25 °C. This value is measured under reverse-bias conditions and reflects the device's primary regulation point. The 1N735 maintains this specification across its qualified operating temperature range, supporting repeatable performance in avionics and radar applications.
Does the 1N735 have a documented maximum operating temperature, and how does it impact thermal design?
Yes, the 1N735 is qualified for operation up to +175 °C ambient temperature per Microsemi's legacy military specifications. This high-temperature rating enables use in engine-mounted avionics and radar transmitter modules without derating. Engineers must ensure junction temperature remains within limits by accounting for 0.25 W power dissipation and DO-35 package thermal resistance in their layout.
Is the 1N735 available in tape-and-reel packaging, and what is its standard shipping format?
The 1N735 ships in TR14 carrier tape containing 10,000 units per reel, as indicated by "TR14\10000cntTR14" in the shipping data. This format supports automated placement in high-volume manufacturing. Aetrix Electronics stocks this configuration and can provide full reels or cut-tape quantities with traceable lot documentation for production programs.
How does the ±10% voltage tolerance of the 1N735 affect circuit design margining?
The ±10% tolerance means the actual zener voltage of any given 1N735 unit falls between 67.5 V and 82.5 V at IZT = 2 mA. Designers must account for this spread when setting overvoltage thresholds or reference levels-especially in safety-critical clamping circuits. The 1N735's tolerance is tighter than generic 20% Zeners but less precise than temperature-compensated references.
Can the 1N735 be used as a direct replacement for the 1N4745 in existing designs?
No, the 1N735 is not a direct replacement for the 1N4745 due to differences in power rating (0.25 W vs. 1 W), package (DO-35 vs. DO-41), and thermal performance. While both share 75 V nominal zener voltage, substituting the 1N735 into a 1N4745-based design risks thermal overload under sustained load. The 1N735 is best applied where its MIL-qualified reliability and compact size are prioritized over raw power capacity.
1N735 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±10%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N735 FAQ
1.How can I place an order for 1N735 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N735 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 1N735 reliable?
The price and inventory of 1N735 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N735 is usually 5 days.
3.What payment methods are accepted for 1N735?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N735 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N735?
1N735 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N735 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 1N735?
For technical support, including 1N735 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N735 requirements.
6.How does Aetrix verify that 1N735 is sourced from the original manufacturer or authorized distributors?
All 1N735 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 1N735 meets industry standards.
7.What is the process for return or replacement of 1N735?
All 1N735 units undergo pre-shipment inspection (PSI). If there is an issue with 1N735, 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 1N735 part is unused and in its original packaging.
Return procedure for 1N735:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N735 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…
