My Inquiry
My Account
Taiwan Semiconductor Corporation 1SMA4757
- Part No.:
- 1SMA4757
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA4757.pdf
- Description:
- DIODE ZENER 51V 1.25W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,555
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMA4757 from Taiwan Semiconductor is a surface-mount 1 W Zener diode with a nominal zener voltage of 51 V ±5%, test current of 5.0 mA, dynamic impedance of 95 Ω at IZT, and maximum leakage current of 0.25 µA at 38.8 V. It operates across –55°C to +175°C junction temperature and is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1SMA4757 datasheet, 1SMA4757 pinout, 1SMA4757 application, or 1SMA4757 equivalent, key selection criteria include its DO-214AC (SMA) package, 51 V zener tolerance, low leakage at rated VR, surge current capability of 90 A, and compliance with JESD201 Class 2 whisker resistance and RoHS/halogen-free standards.
Technical Context
The 1SMA4757 is a single-die, glass-passivated Zener diode optimized for stable reverse-bias regulation under DC and transient conditions. Its 95 Ω dynamic impedance at 5.0 mA ensures predictable clamping behavior, while the 1500 Ω knee impedance at 1 mA supports low-current reference stability.
Designed for surface-mount automation, it features matte tin-plated leads compliant with J-STD-002 solderability and moisture sensitivity level 1 per J-STD-020. The cathode band polarity marking and UL 94V-0 molding compound support reliable PCB assembly and safety-critical placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% - defines precise regulation threshold for feedback or clamp circuits |
| Test Current (IZT) | 5.0 mA - operating point where VZ and ZZT are specified and validated |
| Zener Impedance (ZZT) | 95 Ω at IZT - determines output voltage deviation under load current variation |
| Maximum Leakage (IR) | 0.25 µA at 38.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation (PD) | 1 W at TA = 25°C - sets thermal design margin for PCB copper area and ambient derating |
| Surge Current (IFSM) | 90 A (8.3 ms half-sine) - enables transient overvoltage suppression without failure |
| Junction Temperature (TJ) | –55°C to +175°C - supports operation in automotive engine compartments and industrial enclosures |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration with cathode band marking. Weight: 0.060 g. Molding compound meets UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower potential in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail or feedback point; voltage clamped to 51 V when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable long-term VZ drift performance and humidity resistance in harsh environments |
| Low inductance construction | Minimizes voltage overshoot during fast transients, improving ESD/EMI robustness |
| Moisture sensitivity level 1 | Eliminates bake requirements before reflow, reducing manufacturing cost and process complexity |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for consumer and industrial products |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, ensuring reliability in automotive and telecom systems |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Clamping |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Shunt reference element setting precise 51 V threshold for TL431-like control loop response. Use Value: Tight ±5% VZ tolerance and 95 Ω ZZT ensure <±1% output regulation accuracy across line/load variations. |
Use Scenario: Protecting analog front-end inputs of PLC modules from induced surges on 24 V sensor lines. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting input to 51 V during 1 kV EFT events. Use Value: 90 A non-repetitive surge rating and low leakage (<0.25 µA) preserve signal integrity and system uptime. |
| Automotive Body Control Module | Telecom Line Card Protection |
|
Use Scenario: Stabilizing 5 V microcontroller supply rails against battery dump energy in BCMs. IC Role / Device Role / Timing Role: Secondary clamp absorbing residual transients after primary TVS activation. Use Value: 175°C max junction temperature and DO-214AC thermal performance enable under-hood deployment. |
Use Scenario: Guarding Ethernet PHY interface pins against lightning-induced surges on PoE-powered line cards. IC Role / Device Role / Timing Role: Precision voltage limiter coordinating with upstream GDT and downstream TVS array. Use Value: Matched 51 V clamping with low ZZT ensures coordinated energy sharing and avoids premature failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor 1N4733A | 51 V ±5%, 1 W, DO-41 through-hole package; higher ZZT (17 Ω) but lower surge rating (45 A) | Requires PCB through-hole layout; less suitable for automated SMT lines or space-constrained designs | Select when legacy through-hole compatibility or lower-cost manual assembly is prioritized over SMT efficiency |
| Vishay 1N5233B | 51 V ±5%, 0.5 W, DO-35 glass axial package; tighter initial tolerance (±1%) but lower power and surge capability | Limited to low-power references; not rated for repetitive surge or high-temperature operation | Choose only for ultra-low-power bias networks where 1 W dissipation and 90 A surge are unnecessary |
Compared with 1N4733A and 1N5233B, the 1SMA4757 delivers superior SMT manufacturability, higher surge resilience, and extended thermal range-making it the preferred choice for modern industrial and automotive power management where board space, reliability, and production scalability matter.
Availability
1SMA4757 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and telecom line card protection requiring stable component supply and full traceability.
Supply support for 1SMA4757 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and protection components with global distribution and AEC-Q200 qualified product lines.
The 1SMA47xx series was developed for high-reliability surface-mount Zener regulation in automotive, industrial, and telecom infrastructure-emphasizing thermal robustness, automated assembly compatibility, and stringent environmental compliance.
FAQ
What is the exact zener voltage tolerance for 1SMA4757?
The 1SMA4757 has a nominal zener voltage of 51 V with a standard tolerance of ±5%, meaning the actual measured VZ falls between 48.45 V and 53.55 V at 5.0 mA test current and 30°C lead temperature. This tolerance is guaranteed per JEDEC registration and verified during 100% production testing.
Can 1SMA4757 be used in place of 1N4733A in an existing design?
No direct replacement: 1SMA4757 uses DO-214AC (SMA) surface-mount packaging while 1N4733A is DO-41 through-hole. Though both have 51 V ±5% VZ, the 1SMA4757 offers higher surge current (90 A vs. 45 A) and wider temperature range (–55°C to +175°C vs. –65°C to +175°C), but requires PCB redesign for SMT placement.
What is the maximum allowable power dissipation for 1SMA4757 at 60°C ambient?
At TA = 60°C, the 1SMA4757 supports 1.25 W power dissipation when mounted on a PCB with thermal resistance RTHJA < 76.8 K/W. This derating follows the linear curve shown in Figure 1 of the datasheet and assumes adequate copper pour area per TSC's recommended pad layout.
Does 1SMA4757 meet automotive qualification standards?
The 1SMA4757 is not AEC-Q200 qualified, but its –55°C to +175°C junction temperature range, JESD201 Class 2 whisker resistance, and RoHS/halogen-free construction align with many automotive subsystem requirements. For AEC-Q200-compliant designs, TSC offers the AEC-qualified SMAZ51 series as a drop-in alternative.
How does the 95 Ω dynamic impedance of 1SMA4757 affect regulation accuracy?
The 95 Ω dynamic impedance at 5.0 mA means that a ±10 mA change in zener current causes approximately ±0.95 V shift in clamped voltage. This value directly impacts output regulation tightness in shunt references-designers must size series resistors to maintain IZ within ±2 mA to hold VOUT variation under ±0.2 V.
1SMA4757 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA4757 FAQ
1.How can I place an order for 1SMA4757 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA4757 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 1SMA4757 reliable?
The price and inventory of 1SMA4757 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4757 is usually 5 days.
3.What payment methods are accepted for 1SMA4757?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4757 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA4757?
1SMA4757 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA4757 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 1SMA4757?
For technical support, including 1SMA4757 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4757 requirements.
6.How does Aetrix verify that 1SMA4757 is sourced from the original manufacturer or authorized distributors?
All 1SMA4757 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 1SMA4757 meets industry standards.
7.What is the process for return or replacement of 1SMA4757?
All 1SMA4757 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4757, 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 1SMA4757 part is unused and in its original packaging.
Return procedure for 1SMA4757:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA4757 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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…
