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SS14HR3G Schottky Diode Equivalent & Substitute Parts
Part Overview
The SS14HR3G is a 40V, 1A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in a DO-214AC (SMA) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and design requirements. The part carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance, making it suitable for automotive and industrial applications requiring fast recovery rectification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 40 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) (Max) @ If | 500 mV @ 1 A | mV |
| Speed | Fast Recovery ≤ 500ns, > 200mA (Io) | ns |
| Current - Reverse Leakage @ Vr | 200 | µA @ 40 V |
| Technology | Schottky | — |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature - Junction | -55°C ~ 125°C | °C |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the SS14HR3G is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
- Current - Average Rectified (Io): Must equal or exceed 1A
- Technology: Schottky rectifier diode
- Package / Case: DO-214AC (SMA) for direct mechanical compatibility
- Mounting Type: Surface Mount
- Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Parametric Equivalent Parts maintain identical electrical specifications (40V, 1A, 500mV forward voltage) and package format, enabling direct substitution without circuit redesign.
Similar Parts share the same voltage and current ratings with the same package family but may exhibit variations in forward voltage, reverse leakage current, or temperature range. These parts are functionally compatible but require verification of application-specific performance requirements.
Higher Current Rating Parts (2A devices) are electrically compatible for 1A applications but represent design upgrades rather than direct substitutes.
Alternative Package Formats (SMB, SOD-323) provide electrical equivalence but require PCB layout modification and are suitable only when mechanical constraints permit.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) @ If [mV] | Ir @ Vr [µA] | Package | Product Status | Grade | Qualification |
|---|---|---|---|---|---|---|---|---|---|
| SS14HR3G | Taiwan Semiconductor Corporation | 40 | 1 | 500 @ 1A | 200 @ 40V | DO-214AC (SMA) | Discontinued | Automotive | AEC-Q101 |
| SS14 R3G | Taiwan Semiconductor Corporation | 40 | 1 | 500 @ 1A | 200 @ 40V | DO-214AC (SMA) | Discontinued | — | — |
| SS14H | Taiwan Semiconductor Corporation | 40 | 1 | 500 @ 1A | 200 @ 40V | DO-214AC (SMA) | Active | Automotive | AEC-Q101 |
| SS14 | SMC Diode Solutions | 100 | 1 | 850 @ 1A | 500 @ 100V | DO-214AC (SMA) | Active | — | — |
| B140-13-F | Diodes Incorporated | 40 | 1 | 500 @ 1A | 500 @ 40V | DO-214AC (SMA) | Active | — | — |
| B140Q-13-F | Diodes Incorporated | 40 | 1 | 500 @ 1A | 500 @ 40V | DO-214AC (SMA) | Active | Automotive | AEC-Q101 |
| B140B-13-F | Diodes Incorporated | 40 | 1 | 500 @ 1A | 500 @ 40V | DO-214AA (SMB) | Active | — | — |
| B140HB-13-F | Diodes Incorporated | 40 | 1 | 530 @ 1A | 100 @ 40V | DO-214AA (SMB) | Active | — | — |
| B140WS-7 | Diodes Incorporated | 40 | 1 | 620 @ 1A | 50 @ 40V | SC-76 (SOD-323) | Active | — | — |
| B240A-E3/5AT | Vishay General Semiconductor - Diodes Division | 40 | 2 | 550 @ 2A | 500 @ 40V | DO-214AC (SMA) | Active | — | — |
| B240A-E3/61T | Vishay General Semiconductor - Diodes Division | 40 | 2 | 550 @ 2A | 500 @ 40V | DO-214AC (SMA) | Active | — | — |
Engineering Selection Recommendations
Recommended Primary Substitute: SS14H
The SS14H from Taiwan Semiconductor Corporation is the preferred direct replacement for the discontinued SS14HR3G. This part maintains identical electrical specifications (40V, 1A, 500mV forward voltage) and package format (DO-214AC SMA). The SS14H carries active product status with automotive-grade qualification and AEC-Q101 certification, matching the original part's compliance profile. This substitution requires no circuit modification and presents no compatibility risk.
Recommended Secondary Substitute: B140Q-13-F
The B140Q-13-F from Diodes Incorporated provides electrical equivalence with identical voltage, current, and forward voltage ratings in the same DO-214AC (SMA) package. This part carries automotive-grade qualification and AEC-Q101 certification, maintaining compliance requirements. Active product status ensures long-term availability. Forward voltage and reverse leakage characteristics are within acceptable tolerance for the application.
Alternative Substitute: B140-13-F
The B140-13-F from Diodes Incorporated offers electrical compatibility with matching voltage and current specifications in the DO-214AC (SMA) package. This part is actively produced with extended temperature range (-65°C to 150°C). Reverse leakage current is elevated (500µA vs. 200µA), which may impact low-power applications but remains acceptable for standard rectification circuits.
Higher Current Capacity Option: B240A-E3/61T
The B240A-E3/61T from Vishay provides a 2A rated device in the same DO-214AC (SMA) package with 40V reverse voltage rating. This part is suitable for applications requiring design margin or future current expansion. Forward voltage is specified at 550mV at 2A, representing acceptable performance for 1A operation. This substitution does not require PCB modification.
Alternative Package Formats
B140B-13-F (SMB package) and B140WS-7 (SOD-323 package) provide electrical equivalence but require PCB layout redesign. These options are applicable only when mechanical constraints or thermal management requirements necessitate alternative package formats.
Frequently Asked Questions (FAQ)
Q: Can SS14H directly replace SS14HR3G without circuit modification?
A: Yes. The SS14H maintains identical electrical specifications (40V reverse voltage, 1A average rectified current, 500mV forward voltage) and uses the same DO-214AC (SMA) package. Direct substitution on the PCB is possible without design changes.
Q: What is the difference between parametric equivalent and similar substitute parts?
A: Parametric equivalent parts (SS14H, SS14 R3G) maintain all electrical specifications and package format identical to the original SS14HR3G. Similar substitute parts (B140-13-F, B140Q-13-F) share the same voltage and current ratings but may exhibit variations in forward voltage, reverse leakage, or temperature range. Similar parts are functionally compatible but require application-specific verification.
Q: Is the SMC Diode Solutions SS14 (100V rated) a suitable substitute?
A: The SMC SS14 is not a direct substitute. While it maintains 1A current rating and DO-214AC package format, the 100V reverse voltage rating exceeds application requirements. Additionally, forward voltage is specified at 850mV at 1A, significantly higher than the original 500mV specification. This part represents an over-specification and is not recommended for direct replacement.
Q: Can B240A series (2A rated) parts be used in place of 1A devices?
A: Yes, with design margin consideration. The B240A-E3/61T maintains 40V reverse voltage and DO-214AC package compatibility. The 2A current rating provides operational margin for 1A applications. Forward voltage is specified at 550mV at 2A, which is acceptable for 1A operation. This substitution does not require PCB modification and is suitable for applications where design margin is beneficial.
Q: What are the compliance implications of switching from SS14HR3G to B140Q-13-F?
A: Both parts carry automotive-grade qualification and AEC-Q101 certification, maintaining compliance requirements. The B140Q-13-F is actively produced by Diodes Incorporated, ensuring long-term supply availability. ROHS3 compliance is maintained. No compliance degradation occurs with this substitution.
Q: Why do alternative package formats (SMB, SOD-323) require PCB modification?
A: The SS14HR3G uses DO-214AC (SMA) package with specific footprint dimensions and pin spacing. SMB (DO-214AA) and SOD-323 packages have different physical dimensions and land patterns. Substitution with alternative packages requires PCB layout redesign to accommodate the new footprint. These options are applicable only when mechanical constraints or thermal management requirements justify the design modification.
Q: What is the significance of reverse leakage current variation among substitute parts?
A: Reverse leakage current affects power dissipation and circuit performance in low-power or high-impedance applications. The original SS14HR3G specifies 200µA at 40V. Substitute parts range from 50µA (B140WS-7) to 500µA (B140-13-F, B240A series). For standard rectification applications, this variation is acceptable. For precision analog circuits or ultra-low-power designs, lower leakage options (B140WS-7 at 50µA) may be preferred.
Q: Are there supply chain advantages to selecting specific substitute parts?
A: The SS14H from Taiwan Semiconductor Corporation maintains the original manufacturer relationship with 16,120 units in stock. The B140Q-13-F from Diodes Incorporated offers 40,400 units in stock, providing extended availability. The B240A-E3/61T from Vishay offers 43,931 units in stock. Selection based on inventory levels and supplier relationships may provide supply chain optimization benefits.
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