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onsemi 1N4733A-T50R
- Part No.:
- 1N4733A-T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733A-T50R.pdf
- Description:
- DIODE ZENER 5.1V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:12,000
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Product details
Overview
1N4733A-T50R from onsemi is a 5.1 V, 1 W axial-lead Zener diode in DO-41 package, with ±5% tolerance, 49 Ω dynamic impedance at 49 mA test current, and 10 µA leakage at 1 V reverse bias - used for precision voltage regulation in power supply reference circuits.
For engineers reviewing the 1N4733A-T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, power derating above 50°C, thermal resistance (θJL ≈ 150°C/W), surge capability (890 mA non-repetitive peak reverse), and Pb-free axial packaging compatibility with automated tape-and-reel assembly.
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse-biased avalanche breakdown in silicon. Its Zener voltage is specified at IZ = 49 mA with tight 4.845–5.355 V min/max limits and low dynamic impedance (ZZ ≤ 49 Ω) to maintain regulation under load variation.
Thermal design relies on lead temperature (TL) control: rated for 1.0 W at TL ≤ 50°C, derating linearly at 6.67 mW/°C above that, with junction-to-lead thermal resistance enabling stable operation up to +200°C storage and −65°C operating extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.845–5.355 V at 49 mA - ensures ±5% output stability for 5 V rail references |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - defines maximum continuous DC power in standard lead-mount configuration |
| Zener Impedance (ZZ) | ≤ 49 Ω @ 49 mA - minimizes output voltage shift under varying load current |
| Leakage Current (IR) | ≤ 10 µA @ 1 V - guarantees low standby power loss in high-impedance bias networks |
| Non-repetitive Peak Reverse Current | 890 mA @ 8.3 ms - supports transient overvoltage clamping without failure |
| Operating Temperature Range | −65°C to +200°C - enables use in automotive under-hood and industrial high-temp environments |
Pinout & Package
DO-41 axial-leaded package (Case 017AH), glass or plastic body, 2.03–2.72 mm diameter, 5.20 mm body length, 25.40 mm minimum lead length. Cathode identified by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; establishes reference polarity |
| Cathode | Reverse-bias input / regulated output node | Connected to unregulated input; delivers stable 5.1 V to load when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | ±5% VZ tolerance with 49 mA test current ensures predictable 5.1 V regulation across production lots |
| Low dynamic impedance | 49 Ω max at 49 mA improves load regulation error to <1% per 50 mA load change |
| High surge robustness | 890 mA non-repetitive peak reverse current withstands common power-line transients |
| Pb-free and halide-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) requirements |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Voltage reference element setting output voltage via resistive divider. Use Value: Maintains ±5% output accuracy despite input ripple and load variation due to low ZZ and tight VZ tolerance. |
Use Scenario: Clamping transient spikes on 5 V logic rails or sensor inputs. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground during ESD or inductive kick events. Use Value: Responds within nanoseconds to 890 mA surges at 8.3 ms duration, preventing downstream IC damage. |
| Signal Level Shifting | Current Source Biasing |
Use Scenario: Generating fixed offset voltages for op-amp input stages or ADC reference buffers. IC Role / Device Role / Timing Role: Passive voltage source establishing DC bias point independent of supply fluctuations. Use Value: Delivers stable 5.1 V with <10 µA leakage, minimizing error injection into high-impedance analog nodes. |
Use Scenario: Setting constant current in LED driver or sensor excitation circuits using series resistor. IC Role / Device Role / Timing Role: Stable voltage node enabling predictable IOUT = (VIN − 5.1 V)/R calculation. Use Value: Enables ±1% current accuracy with 1% resistor tolerance, leveraging tight VZ and low tempco. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A-T50A | Same electrical specs, but shipped in fan-fold packaging instead of tape-and-reel | No difference in circuit function; only handling format differs for manual vs. automated placement | Select 1N4733A-T50A for hand-soldering or low-volume prototyping where reel feed is unnecessary |
| BZX55C5V1 | 5.1 V ±5%, 500 mW rating, DO-35 package, higher ZZ (60 Ω), 100 µA IR @ 1 V | Lower power and higher leakage limit use to low-current biasing; not suitable for 1 W regulation loads | Choose BZX55C5V1 only for space-constrained PCBs where DO-35 footprint is required and power < 0.5 W |
Compared with 1N4733A-T50R, the 1N4733A-T50A offers identical performance in alternate packaging, while BZX55C5V1 trades power capability and leakage for smaller size - making 1N4733A-T50R optimal for robust 1 W reference and clamping where thermal margin and low leakage are critical.
Availability
1N4733A-T50R is available at Aetrix Electronics and suitable for power supply reference design, overvoltage protection circuits, signal level shifting, and current source biasing requiring stable component supply and full traceability.
Supply support for 1N4733A-T50R 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N4733A-T50R belongs to the 1N47xxA Zener diode family designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability DC power systems.
FAQ
What is the Zener voltage tolerance of the 1N4733A-T50R?
The 1N4733A-T50R has a nominal Zener voltage of 5.1 V with a guaranteed tolerance of ±5%, corresponding to a min/max range of 4.845 V to 5.355 V when tested at 49 mA. This tolerance is specified at TL = 30°C ±1°C with 3/8″ lead length, and remains stable across its −65°C to +200°C operating temperature range.
Can the 1N4733A-T50R be used in surface-mount designs?
No - the 1N4733A-T50R uses an axial-leaded DO-41 package (Case 017AH) intended for through-hole mounting. It is not compatible with SMT reflow processes. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5222B, which offer similar 5.1 V regulation but require separate validation for power and thermal performance.
What is the maximum allowable junction temperature for the 1N4733A-T50R?
The 1N4733A-T50R does not specify a maximum junction temperature (TJ) directly, but its absolute maximum ratings define an operating temperature range of −65°C to +200°C for both junction and storage. Thermal design must ensure TL ≤ 50°C to sustain full 1.0 W dissipation; above that, power must be linearly derated at 6.67 mW/°C.
How does the 1N4733A-T50R compare to the 1N4733A-T50A in terms of electrical performance?
The 1N4733A-T50R and 1N4733A-T50A share identical electrical specifications - same Zener voltage, impedance, leakage, surge rating, and thermal limits. The only difference is packaging format: T50R denotes tape-and-reel (for automated pick-and-place), while T50A denotes fan-fold (for manual or semi-automated insertion). Both are DO-41, Pb-free, and fully interchangeable electrically.
Is the 1N4733A-T50R suitable for automotive applications?
Yes - the 1N4733A-T50R meets AEC-Q200 stress test requirements for passive components when qualified per onsemi's automotive-grade variants. Its −65°C to +200°C operating/storage range, Pb-free construction, and robust 890 mA surge rating make it suitable for engine control units, body electronics, and infotainment power rails where 5.1 V reference stability is required.
1N4733A-T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4733A-T50R FAQ
1.How can I place an order for 1N4733A-T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733A-T50R 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 1N4733A-T50R reliable?
The price and inventory of 1N4733A-T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733A-T50R is usually 5 days.
3.What payment methods are accepted for 1N4733A-T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733A-T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733A-T50R?
1N4733A-T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733A-T50R 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 1N4733A-T50R?
For technical support, including 1N4733A-T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733A-T50R requirements.
6.How does Aetrix verify that 1N4733A-T50R is sourced from the original manufacturer or authorized distributors?
All 1N4733A-T50R 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 1N4733A-T50R meets industry standards.
7.What is the process for return or replacement of 1N4733A-T50R?
All 1N4733A-T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733A-T50R, 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 1N4733A-T50R part is unused and in its original packaging.
Return procedure for 1N4733A-T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733A-T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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