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onsemi 1N4745CRL
- Part No.:
- 1N4745CRL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4745CRL.pdf
- Description:
- RECTIFIER DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:155,500
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Product details
Overview
1N4745CRL from ON Semiconductor (formerly Motorola) is a 16 V ±2% precision Zener voltage regulator diode in DO-35 glass package, rated for 500 mW DC power dissipation at 50°C ambient, with 15.5 mA test current, 16 Ω dynamic impedance, and 5 µA maximum leakage at 12.2 V reverse bias. It provides stable reference voltage in low-power linear regulators and overvoltage protection circuits.
For engineers reviewing the 1N4745CRL datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±2%), thermal resistance dependence on lead length, junction temperature limits (–65°C to +200°C), surge current rating (285 mA non-repetitive), and DO-35 mechanical compatibility with axial-leaded PCB layouts.
Technical Context
This silicon Zener diode uses metallurgically bonded, oxide-passivated die construction in a hermetically sealed double-slug DO-35 glass case. Its regulation relies on controlled avalanche breakdown at 16 V nominal, with temperature coefficient of +3.5 mV/°C (typical for 12–100 V range).
The device operates with cathode-positive polarity in zener mode and requires thermal management via lead-to-heat-sink length - junction-to-lead thermal resistance drops from ~175°C/W at 1″ lead length to ~25°C/W at 3/8″ per Figure 3. Forward voltage is ≤1.2 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.3 V min / 17.1 V max at IZT = 15 mA - defines tight ±2% tolerance band for precision reference use |
| Power Dissipation (PD) | 500 mW @ TA = 50°C - derates linearly to zero at 150°C ambient; requires heatsinking above 50°C |
| Zener Impedance (ZZT) | 16 Ω max @ IZT = 15 mA - determines output voltage stability under load current variation |
| Leakage Current (IR) | 5 µA max @ VR = 12.2 V - ensures minimal error current in high-impedance reference paths |
| Surge Current (ir) | 285 mA peak, non-repetitive, 1/120 s pulse - supports transient overvoltage clamping without failure |
| Junction Temperature Range | –65°C to +200°C - enables operation in automotive under-hood and industrial environments |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - confirms low-loss forward conduction for bidirectional protection schemes |
Pinout & Package
DO-35 glass axial package: hermetically sealed double-slug construction, cathode indicated by color band; leads are corrosion-resistant and solderable at 230°C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in zener configuration | Connected to system ground or lower-potential rail; carries full zener current when regulating |
| Cathode | Regulated output node in zener configuration | Provides stable 16 V reference; must be held positive relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision 16 V reference designs without calibration adjustment |
| Oxide-passivated die | Ensures long-term parameter stability and reduced surface leakage in humid environments |
| Metallurgically bonded construction | Provides robust thermal cycling performance and low interfacial resistance for reliable heat transfer |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift over 15+ year service life in sealed enclosures |
| Cathode band polarity marking | Eliminates assembly errors in manual or automated placement; visible under 10× magnification |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in discrete linear regulators (e.g., LM317-based circuits) and analog sensor excitation supplies. IC Role / Device Role / Timing Role: Zener diode acting as two-terminal shunt voltage reference. Use Value: Delivers 16 V ±2% accuracy with <16 Ω dynamic impedance, minimizing load-regulation error across 1–15 mA current range. |
Use Scenario: Protecting microcontroller I/O pins or ADC inputs from ESD-induced transients exceeding 16 V. IC Role / Device Role / Timing Role: Passive clamping element limiting voltage excursion to safe levels. Use Value: Absorbs 285 mA non-repetitive surge (per JEDEC) while holding clamped voltage within 17.1 V, preventing latch-up or gate oxide damage. |
| Temperature-Stable Bias Generator | Low-Cost Voltage Monitor |
Use Scenario: Generating bias currents for op-amp input stages where drift must remain below 100 ppm/°C. IC Role / Device Role / Timing Role: Precision voltage source feeding resistor-divider network. Use Value: Temperature coefficient of +3.5 mV/°C (typical) yields <±0.25% drift over –40°C to +85°C, enabling stable bias without compensation. |
Use Scenario: Detecting brown-out conditions in battery-powered devices using comparator threshold set at 16 V. IC Role / Device Role / Timing Role: Fixed reference input to voltage comparator (e.g., LM393). Use Value: Tight ±2% tolerance ensures detection threshold remains within 0.32 V of nominal, avoiding false triggers in noisy 12 V systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX85C16RL | Same 16 V ±2%, DO-41 package (1 W rating), higher surge current (285 mA same), 200°C max TJ | Higher power handling allows sustained 1 W dissipation with heatsinking; larger DO-41 footprint | Select when board layout permits larger package and >500 mW continuous power is required |
| MZPY16RL | Same 16 V ±2%, DO-35 package, identical 500 mW rating, but 10 Ω max ZZT (vs. 16 Ω) | Lower dynamic impedance improves regulation under fast load steps; same thermal profile | Select when tighter AC regulation is critical and MZPY16RL's tighter ZZ spec meets design margin |
Compared with 1N4745CRL, BZX85C16RL offers higher power headroom in a larger package, while MZPY16RL delivers lower dynamic impedance in the same DO-35 form factor - both retain ±2% tolerance and 16 V nominal, making them functionally aligned alternatives for reference and clamp roles.
Availability
1N4745CRL is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and analog bias generation requiring stable component supply across automotive, industrial control, and test equipment programs.
Supply support for 1N4745CRL 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
ON Semiconductor is a global semiconductor supplier specializing in energy-efficient power management, signal conditioning, and discrete components for automotive, industrial, and communications markets.
The 1N47xx series belongs to ON Semiconductor's legacy Zener regulator portfolio, designed for cost-sensitive, high-reliability applications demanding tight voltage tolerance and hermetic reliability in glass packages.
FAQ
What is the exact zener voltage range for 1N4745CRL at 25°C?
The 1N4745CRL has a guaranteed zener voltage range of 15.3 V minimum to 17.1 V maximum when tested at 15 mA (IZT) and 25°C ambient, reflecting its ±2% tolerance designation per JEDEC standards. This range is verified under controlled lead temperature (30°C ±1°C at 3/8″ from body) per Motorola documentation.
Can 1N4745CRL be used in surface-mount designs?
No - the 1N4745CRL is exclusively available in the axial-leaded DO-35 glass package and is not compatible with SMT reflow processes. Its glass body and lead geometry require through-hole mounting; for SMT equivalents, consider ON Semiconductor's NSZV16F or similar SOD-123 packaged Zeners.
What is the maximum allowable junction temperature for 1N4745CRL?
The 1N4745CRL has a specified operating and storage junction temperature range of –65°C to +200°C. Exceeding +200°C risks permanent degradation of the oxide-passivated die and metallurgical bonds, even if power dissipation remains within rated limits.
How does lead length affect thermal performance of 1N4745CRL?
Lead length directly impacts junction-to-ambient thermal resistance: per Figure 3, junction-to-lead thermal resistance (θJL) drops from ~175°C/W at 1″ lead length to ~25°C/W at 3/8″. Shorter leads improve heat transfer to PCB copper or external heatsinks, enabling higher continuous power in constrained thermal environments.
Is 1N4745CRL suitable for bidirectional ESD protection?
No - the 1N4745CRL is a unidirectional Zener diode optimized for reverse-bias regulation. For bidirectional ESD protection, use purpose-built TVS diodes like P6KE16CA (bidirectional, 16 V standoff) or dual-diode arrays; forward conduction (≤1.2 V @ 200 mA) is not rated for repetitive surge handling.
1N4745CRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1N4745CRL FAQ
1.How can I place an order for 1N4745CRL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745CRL 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 1N4745CRL reliable?
The price and inventory of 1N4745CRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745CRL is usually 5 days.
3.What payment methods are accepted for 1N4745CRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745CRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745CRL?
1N4745CRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745CRL 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 1N4745CRL?
For technical support, including 1N4745CRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745CRL requirements.
6.How does Aetrix verify that 1N4745CRL is sourced from the original manufacturer or authorized distributors?
All 1N4745CRL 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 1N4745CRL meets industry standards.
7.What is the process for return or replacement of 1N4745CRL?
All 1N4745CRL units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745CRL, 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 1N4745CRL part is unused and in its original packaging.
Return procedure for 1N4745CRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745CRL Tags
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