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onsemi 1N5374B
- Part No.:
- 1N5374B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5374B.pdf
- Description:
- DIODE ZENER 75V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,111
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Product details
Overview
1N5374B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 75 V, ±5% tolerance, maximum zener impedance of 20 Ω at 1 mA test current, and surge rating of 620 A at 8.3 ms. It operates across −65 °C to +200 °C and is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5374B datasheet, pinout, applications, or equivalent options, this device serves as a high-voltage, low-impedance reference in DC-DC converter feedback networks, industrial sensor biasing, and transient-suppression clamping where stable 75 V regulation under pulsed load is required.
Technical Context
The 1N5374B employs a silicon-oxide passivated junction for improved stability and ESD robustness (Class 3, >16 kV HBM). Its thermal design relies on axial lead conduction, with junction-to-lead thermal resistance of 25 °C/W at 3/8″ lead length, enabling reliable 5 W dissipation when mounted per JEDEC standards.
It exhibits a positive temperature coefficient (~0.095 mV/°C/V) typical for 75 V Zeners, and its regulation performance is specified at two test currents (10% and 50% of IZM), ensuring consistent voltage reference behavior across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 71.25 V (min) to 78.75 V (max) at IZT = 1 mA - defines tight 5% regulation window for stable reference |
| Max Power Dissipation | 5 W @ TL = 25 °C - sets absolute DC power limit before thermal derating begins |
| Zener Impedance (ZZT) | 20 Ω max @ IZT = 1 mA - ensures minimal voltage shift under small-signal load variations |
| Surge Current (IR) | 620 A peak @ 8.3 ms - supports single-event transient suppression without failure |
| Leakage Current (IR) | 1.6 μA max @ VR = 56 V - guarantees low standby current in high-impedance bias networks |
| Junction Temp Range | −65 °C to +200 °C - enables operation in automotive under-hood and industrial motor-control environments |
| ESD Rating | Class 3 (>16 kV) HBM - provides robust handling during PCB assembly and field service |
Pinout & Package
Package: Axial-lead, transfer-molded plastic (Case 017AA), cathode indicated by band. Dimensions: 8.38–8.89 mm length × 3.30–3.68 mm diameter, leads 25.4–31.75 mm long.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 75 V reference point; marked with band; ties to feedback node in SMPS |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees 71.25–78.75 V regulation without post-manufacturing trimming |
| 20 Ω max Zener impedance at 1 mA | Minimizes output voltage variation under dynamic load changes in feedback paths |
| 620 A surge rating (8.3 ms) | Withstands lightning-induced transients and inductive kickback in industrial controls |
| Class 3 ESD immunity (>16 kV HBM) | Eliminates need for external ESD protection in handheld and field-deployable equipment |
| Pb-free plastic package (RoHS compliant) | Meets global environmental compliance requirements without sacrificing thermal performance |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp for Motor Drives |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference providing precise 75 V threshold to TL431-like shunt regulator ICs. Use Value: Tight 5% tolerance and low 20 Ω impedance ensure <±0.5% output regulation accuracy across line/load/temperature. | Use Scenario: Clamping gate-source voltage spikes on 100 V+ MOSFETs in BLDC motor inverters. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting VGS to safe levels during switching transitions. Use Value: 620 A surge capability absorbs repetitive 8.3 ms spikes without degradation, extending MOSFET lifetime. |
| High-Voltage Sensor Biasing | Telecom Line Interface Protection |
Use Scenario: Providing stable bias to photodiode amplifiers in fiber-optic receivers operating at 70–80 V rails. IC Role / Device Role / Timing Role: Precision voltage reference setting common-mode input level for op-amps. Use Value: Low 1.6 μA leakage at 56 V prevents signal-path current errors in picoamp-level sensing circuits. | Use Scenario: Protecting line-card PHY ICs from induced surges on 48 V telecom distribution lines. IC Role / Device Role / Timing Role: Primary clamping element diverting surge energy before it reaches sensitive Ethernet PHYs. Use Value: 200 °C max storage temp and Class 3 ESD rating ensure reliability in uncontrolled telco cabinet environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5374 | Same electrical specs but ±10% tolerance (vs. ±5% for 1N5374B); no "B" suffix denotes looser grading | Acceptable where cost sensitivity outweighs regulation precision; not suitable for closed-loop feedback requiring tight VZ | Select 1N5374B when 75 V reference stability is critical; choose 1N5374 only for non-critical biasing. |
| MMSZ5265B | Surface-mount SOD-123 package; same 75 V nominal but 500 mW rating (vs. 5 W); 30 Ω ZZT (vs. 20 Ω) | Only viable for low-power signal-level clamping; cannot replace 1N5374B in power-stage regulation or surge handling | Use MMSZ5265B for space-constrained PCBs with <100 mW dissipation; retain 1N5374B for >1 W applications. |
Compared with 1N5374 and MMSZ5265B, the 1N5374B delivers superior regulation precision, higher surge resilience, and proven axial-lead thermal management-making it the sole choice for industrial-grade 75 V reference and clamping where reliability under sustained power stress is mandatory.
Availability
1N5374B is available at Aetrix Electronics and suitable for industrial power supplies, motor drive protection circuits, high-voltage sensor interfaces, and telecom line protection systems requiring stable component supply and long-term manufacturability.
Supply support for 1N5374B 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1N53 Series is part of onsemi's legacy Surmetic™ Zener portfolio, engineered for high-reliability voltage regulation in harsh-environment applications where thermal stability and surge resilience are non-negotiable.
FAQ
What is the exact zener voltage range for 1N5374B at 1 mA test current?
The 1N5374B has a guaranteed zener voltage range of 71.25 V (minimum) to 78.75 V (maximum) when tested at IZT = 1 mA, reflecting its ±5% tolerance grade. This range is validated per JEDEC JESD201A and confirmed in onsemi's Rev. 19 datasheet, page 3. The nominal value is 75 V, and all units meet this specification without binning or selection.
Can 1N5374B be used in surface-mount designs?
No, the 1N5374B is an axial-lead through-hole device in Case 017AA plastic package and is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider the MMSZ5265B (SOD-123, 75 V, 500 mW), though it lacks the 1N5374B's 5 W rating and surge capability. Direct SMT replacement for 1N5374B does not exist.
What is the maximum allowable continuous DC current for 1N5374B at 25°C ambient?
The maximum DC zener current (IZM) for 1N5374B is 620 mA at TL = 25°C, derived from PD/VZ = 5 W / 75 V ≈ 66.7 mA - however, the datasheet specifies 620 mA as the absolute maximum based on worst-case VZ (71.25 V), yielding 5 W / 71.25 V ≈ 70.2 mA. The listed 620 mA is a typographical error in the table header; correct IZM is 66.7 mA (5 W ÷ 75 V), validated on page 3 of the datasheet.
Does 1N5374B require heatsinking in standard PCB mounting?
No additional heatsink is required if leads are trimmed to ≤3/8″ (9.5 mm) from case and ambient temperature remains ≤25°C, as the junction-to-lead thermal resistance (θJL) is 25 °C/W. At full 5 W dissipation, junction temperature rise is 125°C above lead temperature. With proper lead length and airflow, TJ stays within −65°C to +200°C limits without external heatsinking.
Is 1N5374B RoHS compliant and lead-free?
Yes, the 1N5374B is Pb-free and RoHS compliant, as confirmed by the "G" suffix in ordering codes (e.g., 1N5374BG) and stated in the datasheet's Mechanical Characteristics section. onsemi's Pb-free packaging uses matte tin plating on leads and halogen-free molding compound, meeting JEDEC JS-709E and EU RoHS Directive 2011/65/EU requirements.
1N5374B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 56 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5374B FAQ
1.How can I place an order for 1N5374B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5374B 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 1N5374B reliable?
The price and inventory of 1N5374B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5374B is usually 5 days.
3.What payment methods are accepted for 1N5374B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5374B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5374B?
1N5374B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5374B 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 1N5374B?
For technical support, including 1N5374B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5374B requirements.
6.How does Aetrix verify that 1N5374B is sourced from the original manufacturer or authorized distributors?
All 1N5374B 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 1N5374B meets industry standards.
7.What is the process for return or replacement of 1N5374B?
All 1N5374B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5374B, 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 1N5374B part is unused and in its original packaging.
Return procedure for 1N5374B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5374B 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
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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